Release 0.03.

[blhc/blhc.git] / bin / blhc

diff --git a/bin/blhc b/bin/blhc
index ad98dc594355431609fa8a91fc83309f5605d7a6..712d16cb7d37c7cb24f5ab5d0274304b06b46d7e 100755 (executable)
--- a/bin/blhc
+++ b/bin/blhc
@@ -22,18 +22,19 @@ use strict;
 use warnings;
 
 use Getopt::Long ();
 use warnings;
 
 use Getopt::Long ();

-use Term::ANSIColor ();

 use Text::ParseWords ();
 
 use Text::ParseWords ();
 

-our $VERSION = '0.01';
+our $VERSION = '0.03';

 
 
 # CONSTANTS/VARIABLES
 
 # Regex to catch compiler commands.
 my $cc_regex = qr/
 
 
 # CONSTANTS/VARIABLES
 
 # Regex to catch compiler commands.
 my $cc_regex = qr/

-    (?<!\.)(?:cc|gcc|g\+\+|c\+\+)
-    (?:-[\d.]+)?
+    (?<!\s-)               # ignore options, e.g. "-c++" [sic!] (used by swig)
+    (?<!\.)                # ignore file names, e.g. "test.gcc"
+    (?:cc|gcc|g\+\+|c\+\+)
+    (?:-[\d.]+)?           # version suffix, e.g. "gcc-4.6"

     /x;
 # Full regex which matches the complete compiler name. Used in a few places to
 # prevent false negatives.
     /x;
 # Full regex which matches the complete compiler name. Used in a few places to
 # prevent false negatives.


@@ -42,14 +43,14 @@ my $cc_regex_full = qr/
     $cc_regex
     /x;
 # Regex to catch (GCC) compiler warnings.
     $cc_regex
     /x;
 # Regex to catch (GCC) compiler warnings.

-my $warning_regex = qr/^(.+?):([0-9]+):[0-9]+: warning: (.+?) \[(.+?)\]$/;
+my $warning_regex = qr/^(.+?):(\d+):\d+: warning: (.+?) \[(.+?)\]$/;

 
 # List of source file extensions which require preprocessing.
 my @source_preprocess_compile_cpp = (
     # C++
     qw( cc cp cxx cpp CPP c++ C ),
     # Objective-C++
 
 # List of source file extensions which require preprocessing.
 my @source_preprocess_compile_cpp = (
     # C++
     qw( cc cp cxx cpp CPP c++ C ),
     # Objective-C++

-    qw( mm Mr),
+    qw( mm M ),

 );
 my @source_preprocess_compile = (
     # C
 );
 my @source_preprocess_compile = (
     # C


@@ -63,7 +64,7 @@ my @source_preprocess_compile = (
 );
 my @source_preprocess_no_compile = (
     # Assembly
 );
 my @source_preprocess_no_compile = (
     # Assembly

-    qw( s ),
+    qw( S sx ),

 );
 my @source_preprocess = (
     @source_preprocess_compile,
 );
 my @source_preprocess = (
     @source_preprocess_compile,


@@ -88,7 +89,7 @@ my @source_no_preprocess_compile = (
 );
 my @source_no_preprocess_no_compile = (
     # Assembly
 );
 my @source_no_preprocess_no_compile = (
     # Assembly

-    qw( S sx ),
+    qw( s ),

 );
 my @source_no_preprocess = (
     @source_no_preprocess_compile,
 );
 my @source_no_preprocess = (
     @source_no_preprocess_compile,


@@ -129,26 +130,20 @@ my %extensions_compile_cpp = map { $_ => 1 } (
 );
 my %extension = map { $_ => 1 } (
     @source_no_preprocess,
 );
 my %extension = map { $_ => 1 } (
     @source_no_preprocess,

-    @source_no_preprocess_compile,
-    @source_no_preprocess_compile_cpp,
-    @source_no_preprocess_no_compile,

     @header_preprocess,
     @source_preprocess,
     @header_preprocess,
     @source_preprocess,

-    @source_preprocess_compile,
-    @source_preprocess_compile_cpp,
-    @source_preprocess_no_compile,

 );
 
 # Regexp to match file extensions.
 my $file_extension_regex = qr/
     \s
 );
 
 # Regexp to match file extensions.
 my $file_extension_regex = qr/
     \s

-    \S+         # Filename without extension.
+    \S+             # Filename without extension.

     \.
     \.

-    ([^\\.\s]+) # File extension.
-    (?=\s|\\)   # At end of word. Can't use \b because some files have non
-                # word characters at the end and because \b matches double
-                # extensions (like .cpp.o). Works always as all lines are
-                # terminated with "\n".
+    ([^\/\\.,;:\s]+)# File extension.
+    (?=\s|\\)       # At end of word. Can't use \b because some files have non
+                    # word characters at the end and because \b matches double
+                    # extensions (like .cpp.o). Works always as all lines are
+                    # terminated with "\n".

     /x;
 
 # Expected (hardening) flags. All flags are used as regexps.
     /x;
 
 # Expected (hardening) flags. All flags are used as regexps.


@@ -158,8 +153,7 @@ my @def_cflags = (
 );
 my @def_cflags_format = (
     '-Wformat',
 );
 my @def_cflags_format = (
     '-Wformat',

-    '-Wformat-security',
-    '-Werror=format-security',
+    '-Werror=format-security', # implies -Wformat-security

 );
 my @def_cflags_fortify = (
     # fortify needs at least -O1, but -O2 is recommended anyway
 );
 my @def_cflags_fortify = (
     # fortify needs at least -O1, but -O2 is recommended anyway


@@ -172,20 +166,26 @@ my @def_cflags_pie = (
     '-fPIE',
 );
 my @def_cxxflags = (
     '-fPIE',
 );
 my @def_cxxflags = (

-    '-g',
-    '-O(?:2|3)',
+    @def_cflags,

 );
 # @def_cxxflags_* is the same as @def_cflags_*.
 my @def_cppflags = ();
 my @def_cppflags_fortify = (
 );
 # @def_cxxflags_* is the same as @def_cflags_*.
 my @def_cppflags = ();
 my @def_cppflags_fortify = (

-    '-D_FORTIFY_SOURCE=2',
+    '-D_FORTIFY_SOURCE=2', # must be first, see cppflags_fortify_broken()
+    # If you add another flag fix hack below (search for "Hack to fix").
+);
+my @def_cppflags_fortify_bad = (
+    # These flags may overwrite -D_FORTIFY_SOURCE=2.
+    '-U_FORTIFY_SOURCE',
+    '-D_FORTIFY_SOURCE=0',
+    '-D_FORTIFY_SOURCE=1',

 );
 my @def_ldflags = ();
 my @def_ldflags_relro = (
 );
 my @def_ldflags = ();
 my @def_ldflags_relro = (

-    '-Wl,(-z,)?relro',
+    '-Wl,(?:-z,)?relro',

 );
 my @def_ldflags_bindnow = (
 );
 my @def_ldflags_bindnow = (

-    '-Wl,(-z,)?now',
+    '-Wl,(?:-z,)?now',

 );
 my @def_ldflags_pie = (
     '-fPIE',
 );
 my @def_ldflags_pie = (
     '-fPIE',


@@ -194,13 +194,67 @@ my @def_ldflags_pie = (
 my @def_ldflags_pic = (
     '-fPIC',
     '-fpic',
 my @def_ldflags_pic = (
     '-fPIC',
     '-fpic',

+    '-shared',
+);
+# References to all flags checked by the flag checker.
+my @flag_refs = (
+    \@def_cflags,
+    \@def_cflags_format,
+    \@def_cflags_fortify,
+    \@def_cflags_stack,
+    \@def_cflags_pie,
+    \@def_cxxflags,
+    \@def_cppflags,
+    \@def_cppflags_fortify,
+    \@def_ldflags,
+    \@def_ldflags_relro,
+    \@def_ldflags_bindnow,
+    \@def_ldflags_pie,
+);
+# References to all used flags.
+my @flag_refs_all = (
+    @flag_refs,
+    \@def_cppflags_fortify_bad,
+    \@def_ldflags_pic,

 );
 # Renaming rules for the output so the regex parts are not visible. Also
 # stores string values of flag regexps above, see compile_flag_regexp().
 my %flag_renames = (
 );
 # Renaming rules for the output so the regex parts are not visible. Also
 # stores string values of flag regexps above, see compile_flag_regexp().
 my %flag_renames = (

-    '-O(?:2|3)'       => '-O2',
-    '-Wl,(-z,)?relro' => '-Wl,-z,relro',
-    '-Wl,(-z,)?now'   => '-Wl,-z,now',
+    '-O(?:2|3)'         => '-O2',
+    '-Wl,(?:-z,)?relro' => '-Wl,-z,relro',
+    '-Wl,(?:-z,)?now'   => '-Wl,-z,now',
+);
+
+my %exit_code = (
+    no_compiler_commands => 1 << 0,
+    # used by POD::Usage => 1 << 1,
+    non_verbose_build    => 1 << 2,
+    flags_missing        => 1 << 3,
+    hardening_wrapper    => 1 << 4,
+    invalid_cmake        => 1 << 5,
+);
+
+my %buildd_tag = (
+    no_compiler_commands => 'I-no-compiler-commands',
+    non_verbose_build    => 'W-compiler-flags-hidden',
+    flags_missing        => 'W-dpkg-buildflags-missing',
+    hardening_wrapper    => 'I-hardening-wrapper-used',
+    invalid_cmake        => 'I-invalid-cmake-used',
+);
+
+# Statistics of missing flags and non-verbose build commands. Used for
+# $option_buildd.
+my %statistics = (
+    preprocess          => 0,
+    preprocess_missing  => 0,
+    compile             => 0,
+    compile_missing     => 0,
+    compile_cpp         => 0,
+    compile_cpp_missing => 0,
+    link                => 0,
+    link_missing        => 0,
+    commands            => 0,
+    commands_nonverbose => 0,

 );
 
 # Use colored (ANSI) output?
 );
 
 # Use colored (ANSI) output?


@@ -218,18 +272,26 @@ sub error_flags {
         } @{$missing_flags_ref};
 
     my $flags = join ' ', @missing_flags;
         } @{$missing_flags_ref};
 
     my $flags = join ' ', @missing_flags;

-    printf "%s (%s)%s %s",
+    printf '%s (%s)%s %s',

            error_color($message, 'red'), $flags, error_color(':', 'yellow'),
            $line;
 }
 sub error_non_verbose_build {
     my ($line) = @_;
 
            error_color($message, 'red'), $flags, error_color(':', 'yellow'),
            $line;
 }
 sub error_non_verbose_build {
     my ($line) = @_;
 

-    printf "%s%s %s",
+    printf '%s%s %s',

            error_color('NONVERBOSE BUILD', 'red'),
            error_color(':', 'yellow'),
            $line;
 }
            error_color('NONVERBOSE BUILD', 'red'),
            error_color(':', 'yellow'),
            $line;
 }

+sub error_invalid_cmake {
+    my ($version) = @_;
+
+    printf "%s%s %s\n",
+            error_color('INVALID CMAKE', 'red'),
+            error_color(':', 'yellow'),
+            $version;
+}

 sub error_hardening_wrapper {
     printf "%s%s %s\n",
             error_color('HARDENING WRAPPER', 'red'),
 sub error_hardening_wrapper {
     printf "%s%s %s\n",
             error_color('HARDENING WRAPPER', 'red'),


@@ -271,6 +333,22 @@ sub all_flags_used {
     return 0;
 }
 
     return 0;
 }
 

+sub cppflags_fortify_broken {
+    my ($line, $missing_flags) = @_;
+
+    # This doesn't take the position into account, but is a simple solution.
+    # And if the build system tries to force -D_FORTIFY_SOURCE=0/1, something
+    # is wrong anyway.
+
+    if (any_flags_used($line, @def_cppflags_fortify_bad)) {
+        # $def_cppflags_fortify[0] must be -D_FORTIFY_SOURCE=2!
+        push @{$missing_flags}, $def_cppflags_fortify[0];
+        return 1;
+    }
+
+    return 0;
+}
+

 # Modifies $missing_flags_ref array.
 sub pic_pie_conflict {
     my ($line, $pie, $missing_flags_ref, @flags_pie) = @_;
 # Modifies $missing_flags_ref array.
 sub pic_pie_conflict {
     my ($line, $pie, $missing_flags_ref, @flags_pie) = @_;


@@ -296,14 +374,24 @@ sub pic_pie_conflict {
 sub is_non_verbose_build {
     my ($line, $next_line, $skip_ref) = @_;
 
 sub is_non_verbose_build {
     my ($line, $next_line, $skip_ref) = @_;
 

-    if (not ($line =~ /^checking if you want to see long compiling messages\.\.\. no/
-                or $line =~ /^\s*\[?(?:CC|CCLD|CXX|CXXLD|LD|LINK)\]?\s+(.+?)$/
-                or $line =~ /^\s*(?:C|c)ompiling\s+(.+?)(?:\.\.\.)?$/
-                or $line =~ /^\s*(?:B|b)uilding (?:program|shared library)\s+(.+?)$/
+    if (not (index($line, 'checking if you want to see long compiling messages... no') == 0
+                or $line =~ /^\s*\[?(?:CC|CCLD|C\+\+|CXX|CXXLD|LD|LINK)\]?\s+(.+?)$/
+                or $line =~ /^\s*[Cc]ompiling\s+(.+?)(?:\.\.\.)?$/
+                or $line =~ /^\s*[Bb]uilding (?:program|shared library)\s+(.+?)$/

                 or $line =~ /^\s*\[[\d ]+%\] Building (?:C|CXX) object (.+?)$/)) {
         return 0;
     }
 
                 or $line =~ /^\s*\[[\d ]+%\] Building (?:C|CXX) object (.+?)$/)) {
         return 0;
     }
 

+    # False positives.
+    #
+    # C++ compiler setting.
+    return 0 if $line =~ /^\s*C\+\+.+?:\s+(?:yes|no)\s*$/;
+    # "Compiling" with no file name.
+    if ($line =~ /^\s*[Cc]ompiling\s+(.+?)(?:\.\.\.)?$/) {
+        # $file_extension_regex may need spaces around the filename.
+        return 0 if not " $1 " =~ /$file_extension_regex/o;
+    }
+

     my $file = $1;
 
     # On the first pass we only check if this line is verbose or not.
     my $file = $1;
 
     # On the first pass we only check if this line is verbose or not.


@@ -318,10 +406,10 @@ sub is_non_verbose_build {
     if (defined $file) {
         # Get filename, we can't use the complete path as only parts of it are
         # used in the real compiler command.
     if (defined $file) {
         # Get filename, we can't use the complete path as only parts of it are
         # used in the real compiler command.

-        $file =~ m{/([a-zA-Z0-9._-]+)$};
+        $file =~ m{/([^/\s]+)$};

         $file = $1;
 
         $file = $1;
 

-        if ($next_line =~ /\Q$file\E/ and $next_line =~ /$cc_regex/o) {
+        if (index($next_line, $file) != -1 and $next_line =~ /$cc_regex/o) {

             # We still have to skip the current line as it doesn't contain any
             # compiler commands.
             ${$skip_ref} = 1;
             # We still have to skip the current line as it doesn't contain any
             # compiler commands.
             ${$skip_ref} = 1;


@@ -332,6 +420,21 @@ sub is_non_verbose_build {
     return 1;
 }
 
     return 1;
 }
 

+sub remove_flags {
+    my ($flag_refs_ref, $flag_renames_ref, @flags) = @_;
+
+    my %removes = map { $_ => 1 } @flags;
+    foreach my $flags (@{$flag_refs_ref}) {
+        @{$flags} = grep {
+            # Flag found as string.
+            not exists $removes{$_}
+            # Flag found as string representation of regexp.
+                and (not defined $flag_renames_ref->{$_}
+                        or not exists $removes{$flag_renames_ref->{$_}})
+        } @{$flags};
+    }
+}
+

 sub compile_flag_regexp {
     my ($flag_renames_ref, @flags) = @_;
 
 sub compile_flag_regexp {
     my ($flag_renames_ref, @flags) = @_;
 


@@ -367,25 +470,36 @@ sub extension_found {
 # MAIN
 
 # Parse command line arguments.
 # MAIN
 
 # Parse command line arguments.

-my $option_help    = 0;
-my $option_version = 0;
-my $option_pie     = 0;
-my $option_bindnow = 0;
-my $option_all     = 0;
-my $option_arch    = undef;
-my $option_buildd  = 0;
-   $option_color   = 0;
+my $option_help             = 0;
+my $option_version          = 0;
+my $option_pie              = 0;
+my $option_bindnow          = 0;
+my @option_ignore_arch      = ();
+my @option_ignore_flag      = ();
+my @option_ignore_arch_flag = ();
+my @option_ignore_line      = ();
+my @option_ignore_arch_line = ();
+my $option_all              = 0;
+my $option_arch             = undef;
+my $option_buildd           = 0;
+   $option_color            = 0;

 if (not Getopt::Long::GetOptions(
 if (not Getopt::Long::GetOptions(

-            'help|h|?' => \$option_help,
-            'version'  => \$option_version,
+            'help|h|?'           => \$option_help,
+            'version'            => \$option_version,

             # Hardening options.
             # Hardening options.

-            'pie'      => \$option_pie,
-            'bindnow'  => \$option_bindnow,
-            'all'      => \$option_all,
+            'pie'                => \$option_pie,
+            'bindnow'            => \$option_bindnow,
+            'all'                => \$option_all,
+            # Ignore.
+            'ignore-arch=s'      => \@option_ignore_arch,
+            'ignore-flag=s'      => \@option_ignore_flag,
+            'ignore-arch-flag=s' => \@option_ignore_arch_flag,
+            'ignore-line=s'      => \@option_ignore_line,
+            'ignore-arch-line=s' => \@option_ignore_arch_line,

             # Misc.
             # Misc.

-            'color'    => \$option_color,
-            'arch=s'   => \$option_arch,
-            'buildd'   => \$option_buildd,
+            'color'              => \$option_color,
+            'arch=s'             => \$option_arch,
+            'buildd'             => \$option_buildd,

         )) {
     require Pod::Usage;
     Pod::Usage::pod2usage(2);
         )) {
     require Pod::Usage;
     Pod::Usage::pod2usage(2);


@@ -413,32 +527,84 @@ along with this program.  If not, see <http://www.gnu.org/licenses/>.
     exit 0;
 }
 
     exit 0;
 }
 

+# Arguments missing.
+if (scalar @ARGV == 0) {
+    require Pod::Usage;
+    Pod::Usage::pod2usage(2);
+}
+
+# Don't load Term::ANSIColor in buildd mode because Term::ANSIColor is not
+# installed on Debian's buildds.
+if (not $option_buildd) {
+    require Term::ANSIColor;
+}
+

 if ($option_all) {
     $option_pie     = 1;
     $option_bindnow = 1;
 }
 
 if ($option_all) {
     $option_pie     = 1;
     $option_bindnow = 1;
 }
 

+# Precompiled ignores for faster lookup.
+my %option_ignore_arch_flag = ();
+my %option_ignore_arch_line = ();
+
+# Strip flags which should be ignored.
+if (scalar @option_ignore_flag > 0) {
+    remove_flags(\@flag_refs, \%flag_renames, @option_ignore_flag);
+}
+# Same for arch specific ignore flags, but only prepare here.
+if (scalar @option_ignore_arch_flag > 0) {
+    foreach my $ignore (@option_ignore_arch_flag) {
+        my ($ignore_arch, $ignore_flag) = split ':', $ignore, 2;
+
+        if (not $ignore_arch or not $ignore_flag) {
+            printf STDERR 'Value "%s" invalid for option ignore-arch-flag '
+                        . '("arch:flag" expected)' . "\n", $ignore;
+            require Pod::Usage;
+            Pod::Usage::pod2usage(2);
+        }
+
+        push @{$option_ignore_arch_flag{$ignore_arch}}, $ignore_flag;
+    }
+}
+

 # Precompile all flag regexps. any_flags_used(), all_flags_used() get a lot
 # faster with this.
 # Precompile all flag regexps. any_flags_used(), all_flags_used() get a lot
 # faster with this.

-@def_cflags           = compile_flag_regexp(\%flag_renames, @def_cflags);
-@def_cflags_format    = compile_flag_regexp(\%flag_renames, @def_cflags_format);
-@def_cflags_fortify   = compile_flag_regexp(\%flag_renames, @def_cflags_fortify);
-@def_cflags_stack     = compile_flag_regexp(\%flag_renames, @def_cflags_stack);
-@def_cflags_pie       = compile_flag_regexp(\%flag_renames, @def_cflags_pie);
-@def_cxxflags         = compile_flag_regexp(\%flag_renames, @def_cxxflags);
-@def_cppflags         = compile_flag_regexp(\%flag_renames, @def_cppflags);
-@def_cppflags_fortify = compile_flag_regexp(\%flag_renames, @def_cppflags_fortify);
-@def_ldflags          = compile_flag_regexp(\%flag_renames, @def_ldflags);
-@def_ldflags_relro    = compile_flag_regexp(\%flag_renames, @def_ldflags_relro);
-@def_ldflags_bindnow  = compile_flag_regexp(\%flag_renames, @def_ldflags_bindnow);
-@def_ldflags_pie      = compile_flag_regexp(\%flag_renames, @def_ldflags_pie);
-@def_ldflags_pic      = compile_flag_regexp(\%flag_renames, @def_ldflags_pic);
+foreach my $flags (@flag_refs_all) {
+    @{$flags} = compile_flag_regexp(\%flag_renames, @{$flags});
+}
+
+# Precompile ignore line regexps, also anchor at beginning and end of line.
+foreach my $ignore (@option_ignore_line) {
+    $ignore = qr/^$ignore$/;
+}
+# Same for arch specific ignore lines.
+if (scalar @option_ignore_arch_line > 0) {
+    foreach my $ignore (@option_ignore_arch_line) {
+        my ($ignore_arch, $ignore_line) = split ':', $ignore, 2;
+
+        if (not $ignore_arch or not $ignore_line) {
+            printf STDERR 'Value "%s" invalid for option ignore-arch-line '
+                        . '("arch:line" expected)' . "\n", $ignore;
+            require Pod::Usage;
+            Pod::Usage::pod2usage(2);
+        }
+
+        push @{$option_ignore_arch_line{$ignore_arch}}, qr/^$ignore_line$/;
+    }
+}

 
 # Final exit code.
 my $exit = 0;
 
 
 # Final exit code.
 my $exit = 0;
 

-FILE: foreach my $file (@ARGV) {
-    open my $fh, '<', $file or die "$!: $file";
+FILE:
+foreach my $file (@ARGV) {
+    print "checking '$file'...\n" if scalar @ARGV > 1;
+
+    open my $fh, '<', $file or die $!;
+
+    # Architecture of this file.
+    my $arch = $option_arch;

 
     # Hardening options. Not all architectures support all hardening options.
     my $harden_format  = 1;
 
     # Hardening options. Not all architectures support all hardening options.
     my $harden_format  = 1;


@@ -449,15 +615,25 @@ FILE: foreach my $file (@ARGV) {
     my $harden_pie     = $option_pie;     # defaults to 0
 
     while (my $line = <$fh>) {
     my $harden_pie     = $option_pie;     # defaults to 0
 
     while (my $line = <$fh>) {

+        # Detect architecture automatically unless overridden. For buildd logs
+        # only, doesn't use the dpkg-buildpackage header. Necessary to ignore
+        # build logs which aren't built (wrong architecture, build error,
+        # etc.).
+        if (not $arch
+                and $line =~ /^Architecture: (.+)$/) {
+            $arch = $1;
+        }
+

         # dpkg-buildflags only provides hardening flags since 1.16.1, don't
         # check for hardening flags in buildd mode if an older dpkg-dev is
         # used. Default flags (-g -O2) are still checked.
         #
         # Packages which were built before 1.16.1 but used their own hardening
         # flags are not checked.
         # dpkg-buildflags only provides hardening flags since 1.16.1, don't
         # check for hardening flags in buildd mode if an older dpkg-dev is
         # used. Default flags (-g -O2) are still checked.
         #
         # Packages which were built before 1.16.1 but used their own hardening
         # flags are not checked.

-        if ($option_buildd and $line =~ /^Toolchain package versions: /) {
+        if ($option_buildd
+                and index($line, 'Toolchain package versions: ') == 0) {

             require Dpkg::Version;
             require Dpkg::Version;

-            if ($line !~ /dpkg-dev_(\S+)/
+            if (not $line =~ /\bdpkg-dev_(\S+)/

                     or Dpkg::Version::version_compare($1, '1.16.1') < 0) {
                 $harden_format  = 0;
                 $harden_fortify = 0;
                     or Dpkg::Version::version_compare($1, '1.16.1') < 0) {
                 $harden_format  = 0;
                 $harden_fortify = 0;


@@ -468,17 +644,39 @@ FILE: foreach my $file (@ARGV) {
             }
         }
 
             }
         }
 

+        # The following two versions of CMake in Debian obeyed CPPFLAGS, but
+        # this was later dropped because upstream rejected the patch. Thus
+        # build logs with these versions will have fortify hardening flags
+        # enabled, even though they may be not correctly set and are missing
+        # when build with later CMake versions. Thanks to Aron Xu for letting
+        # me know.
+        if (index($line, 'Package versions: ') == 0
+                and $line =~ /\bcmake_(\S+)/
+                and ($1 eq '2.8.7-1' or $1 eq '2.8.7-2')) {
+            if (not $option_buildd) {
+                error_invalid_cmake($1);
+            } else {
+                print "$buildd_tag{invalid_cmake} $1\n";
+            }
+            $exit |= $exit_code{invalid_cmake};
+        }
+

         # If hardening wrapper is used (wraps calls to gcc and adds hardening
         # flags automatically) we can't perform any checks, abort.
         # If hardening wrapper is used (wraps calls to gcc and adds hardening
         # flags automatically) we can't perform any checks, abort.

-        if ($line =~ /^Build-Depends: .*\bhardening-wrapper\b/) {
-            error_hardening_wrapper();
-            $exit |= 1 << 4;
+        if (index($line, 'Build-Depends: ') == 0
+                and $line =~ /\bhardening-wrapper\b/) {
+            if (not $option_buildd) {
+                error_hardening_wrapper();
+            } else {
+                print "$buildd_tag{hardening_wrapper}\n";
+            }
+            $exit |= $exit_code{hardening_wrapper};

             next FILE;
         }
 
         # We skip over unimportant lines at the beginning of the log to
         # prevent false positives.
             next FILE;
         }
 
         # We skip over unimportant lines at the beginning of the log to
         # prevent false positives.

-        last if $line =~ /^dpkg-buildpackage:/;
+        last if index($line, 'dpkg-buildpackage: ') == 0;

     }
 
     # Input lines, contain only the lines with compiler commands.
     }
 
     # Input lines, contain only the lines with compiler commands.


@@ -493,15 +691,15 @@ FILE: foreach my $file (@ARGV) {
         last if $line =~ /^Build finished at \d{8}-\d{4}$/;
 
         # Detect architecture automatically unless overridden.
         last if $line =~ /^Build finished at \d{8}-\d{4}$/;
 
         # Detect architecture automatically unless overridden.

-        if (not $option_arch
+        if (not $arch

                 and $line =~ /^dpkg-buildpackage: host architecture (.+)$/) {
                 and $line =~ /^dpkg-buildpackage: host architecture (.+)$/) {

-            $option_arch = $1;
+            $arch = $1;

         }
 
         # Ignore compiler warnings for now.
         next if $line =~ /$warning_regex/o;
 
         }
 
         # Ignore compiler warnings for now.
         next if $line =~ /$warning_regex/o;
 

-        if ($line =~ /\033/) { # esc
+        if (not $option_buildd and index($line, "\033") != -1) { # esc

             # Remove all ANSI color sequences which are sometimes used in
             # non-verbose builds.
             $line = Term::ANSIColor::colorstrip($line);
             # Remove all ANSI color sequences which are sometimes used in
             # non-verbose builds.
             $line = Term::ANSIColor::colorstrip($line);


@@ -518,7 +716,7 @@ FILE: foreach my $file (@ARGV) {
 
         # One line may contain multiple commands (";"). Treat each one as
         # single line. parse_line() is slow, only use it when necessary.
 
         # One line may contain multiple commands (";"). Treat each one as
         # single line. parse_line() is slow, only use it when necessary.

-        my @line = (not $line =~ /;/)
+        my @line = (index($line, ';') == -1)

                  ? ($line)
                  : map {
                        # Ensure newline at the line end - necessary for
                  ? ($line)
                  : map {
                        # Ensure newline at the line end - necessary for


@@ -526,7 +724,7 @@ FILE: foreach my $file (@ARGV) {
                        $_ =~ s/\s+$//;
                        $_ .= "\n";
                    } Text::ParseWords::parse_line(';', 1, $line);
                        $_ =~ s/\s+$//;
                        $_ .= "\n";
                    } Text::ParseWords::parse_line(';', 1, $line);

-        foreach $line (@line) {
+        foreach my $line (@line) {

             if ($continuation) {
                 $continuation = 0;
 
             if ($continuation) {
                 $continuation = 0;
 


@@ -536,7 +734,7 @@ FILE: foreach my $file (@ARGV) {
                 $complete_line .= ' ' . $line;
             }
             # Line continuation, line ends with "\".
                 $complete_line .= ' ' . $line;
             }
             # Line continuation, line ends with "\".

-            if ($line =~ /\\\s*$/) {
+            if ($line =~ /\\$/) {

                 $continuation = 1;
                 # Start line continuation.
                 if (not defined $complete_line) {
                 $continuation = 1;
                 # Start line continuation.
                 if (not defined $complete_line) {


@@ -545,52 +743,77 @@ FILE: foreach my $file (@ARGV) {
                 next;
             }
 
                 next;
             }
 

-            if (not $continuation) {
-                # Use the complete line if a line continuation occurred.
-                if (defined $complete_line) {
-                    $line = $complete_line;
-                    $complete_line = undef;
-                }
-
-                # Ignore lines with no compiler commands.
-                next if $line !~ /\b$cc_regex(?:\s|\\)/o and not $non_verbose;
-
-                # Ignore false positives.
-                #
-                # `./configure` output.
-                next if not $non_verbose
-                        and $line =~ /^(?:checking|(?:C|c)onfigure:) /;
-                next if $line =~ /^\s*(?:Host\s+)?(?:C\s+)?
-                                   (?:C|c)ompiler[\s.]*:?\s+
-                                   $cc_regex_full
-                                   (?:\s-std=[a-z0-9:+]+)?\s*$
-                                 /xo
-                        or $line =~ /^\s*(?:- )?(?:HOST_)?(?:CC|CXX)\s*=\s*$cc_regex_full\s*$/o
-                        or $line =~ /^\s*-- Check for working (?:C|CXX) compiler: /
-                        or $line =~ /^\s*(?:echo )?Using [A-Z_]+\s*=\s*/;
-                # `make` output.
-                next if $line =~ /^Making [a-z]+ in \S+/; # e.g. "[...] in c++"
-
-                # Check if additional hardening options were used. Used to
-                # ensure they are used for the complete build.
-                $harden_pie     = 1 if any_flags_used($line, @def_cflags_pie, @def_ldflags_pie);
-                $harden_bindnow = 1 if any_flags_used($line, @def_ldflags_bindnow);
-
-                push @input, $line;
+            # Use the complete line if a line continuation occurred.
+            if (defined $complete_line) {
+                $line = $complete_line;
+                $complete_line = undef;

             }
             }

+
+            # Ignore lines with no compiler commands.
+            next if not $non_verbose
+                    and not $line =~ /\b$cc_regex(?:\s|\\)/o;
+            # Ignore lines with no filenames with extensions. May miss some
+            # non-verbose builds (e.g. "gcc -o test" [sic!]), but shouldn't be
+            # a problem as the log will most likely contain other non-verbose
+            # commands which are detected.
+            next if not $non_verbose
+                    and not $line =~ /$file_extension_regex/o;
+
+            # Ignore false positives.
+            #
+            # `./configure` output.
+            next if not $non_verbose
+                    and $line =~ /^(?:checking|[Cc]onfigure:) /;
+            next if $line =~ /^\s*(?:Host\s+)?(?:C(?:\+\+)?\s+)?
+                                [Cc]ompiler[\s.]*:?\s+
+                                /xo;
+            next if $line =~ /^\s*(?:- )?(?:HOST_)?(?:CC|CXX)\s*=\s*$cc_regex_full\s*$/o;
+            # `moc-qt4`, contains '-I/usr/share/qt4/mkspecs/linux-g++' (or
+            # similar for other architectures) which gets recognized as a
+            # compiler line. Ignore it.
+            next if $line =~ m{^/usr/bin/moc-qt4
+                               \s.+\s
+                               -I/usr/share/qt4/mkspecs/[a-z]+-g\++(?:-64)?
+                               \s}x;
+
+            # Check if additional hardening options were used. Used to ensure
+            # they are used for the complete build.
+            $harden_pie     = 1 if any_flags_used($line, @def_cflags_pie,
+                                                         @def_ldflags_pie);
+            $harden_bindnow = 1 if any_flags_used($line, @def_ldflags_bindnow);
+
+            push @input, $line;

         }
     }
 
         }
     }
 

-    close $fh;
+    close $fh or die $!;
+
+    # Ignore arch if requested.
+    if (scalar @option_ignore_arch > 0 and $arch) {
+        foreach my $ignore (@option_ignore_arch) {
+            if ($arch eq $ignore) {
+                print "ignoring architecture '$arch'\n";
+                next FILE;
+            }
+        }
+    }

 
     if (scalar @input == 0) {
 
     if (scalar @input == 0) {

-        print "No compiler commands!\n";
-        $exit |= 1;
+        if (not $option_buildd) {
+            print "No compiler commands!\n";
+        } else {
+            print "$buildd_tag{no_compiler_commands}\n";
+        }
+        $exit |= $exit_code{no_compiler_commands};

         next FILE;
     }
 
         next FILE;
     }
 

+    if ($option_buildd) {
+        $statistics{commands} += scalar @input;
+    }
+

     # Option or auto detected.
     # Option or auto detected.

-    if ($option_arch) {
+    if ($arch) {

         # The following was partially copied from dpkg-dev 1.16.1.2
         # (/usr/share/perl5/Dpkg/Vendor/Debian.pm, add_hardening_flags()),
         # copyright Raphaël Hertzog <hertzog@debian.org>, Kees Cook
         # The following was partially copied from dpkg-dev 1.16.1.2
         # (/usr/share/perl5/Dpkg/Vendor/Debian.pm, add_hardening_flags()),
         # copyright Raphaël Hertzog <hertzog@debian.org>, Kees Cook


@@ -598,13 +821,13 @@ FILE: foreach my $file (@ARGV) {
         # later. Keep it in sync.
 
         require Dpkg::Arch;
         # later. Keep it in sync.
 
         require Dpkg::Arch;

-        my ($abi, $os, $cpu) = Dpkg::Arch::debarch_to_debtriplet($option_arch);
+        my ($abi, $os, $cpu) = Dpkg::Arch::debarch_to_debtriplet($arch);

 
         # Disable unsupported hardening options.
 
         # Disable unsupported hardening options.

-        if ($cpu =~ /^(ia64|alpha|mips|mipsel|hppa)$/ or $option_arch eq 'arm') {
+        if ($cpu =~ /^(?:ia64|alpha|mips|mipsel|hppa)$/ or $arch eq 'arm') {

             $harden_stack = 0;
         }
             $harden_stack = 0;
         }

-        if ($cpu =~ /^(ia64|hppa|avr32)$/) {
+        if ($cpu =~ /^(?:ia64|hppa|avr32)$/) {

             $harden_relro   = 0;
             $harden_bindnow = 0;
         }
             $harden_relro   = 0;
             $harden_bindnow = 0;
         }


@@ -641,13 +864,45 @@ FILE: foreach my $file (@ARGV) {
         @ldflags = (@ldflags, @def_ldflags_bindnow);
     }
 
         @ldflags = (@ldflags, @def_ldflags_bindnow);
     }
 

+    # Hack to fix cppflags_fortify_broken() if --ignore-flag
+    # -D_FORTIFY_SOURCE=2 is used to ignore missing fortification. Only works
+    # as long as @def_cppflags_fortify contains only one variable.
+    if (scalar @def_cppflags_fortify == 0) {
+        $harden_fortify = 0;
+    }
+
+    # Ignore flags for this arch if requested.
+    if ($arch and exists $option_ignore_arch_flag{$arch}) {
+        my @flag_refs = (\@cflags, \@cxxflags, \@cppflags, \@ldflags);
+
+        remove_flags(\@flag_refs,
+                     \%flag_renames,
+                     @{$option_ignore_arch_flag{$arch}});
+    }
+
+    my @ignore_line = @option_ignore_line;
+    # Ignore lines for this arch if requested.
+    if ($arch and exists $option_ignore_arch_line{$arch}) {
+        @ignore_line = (@ignore_line, @{$option_ignore_arch_line{$arch}});
+    }
+
+LINE:

     for (my $i = 0; $i < scalar @input; $i++) {
         my $line = $input[$i];
 
     for (my $i = 0; $i < scalar @input; $i++) {
         my $line = $input[$i];
 

+        # Ignore line if requested.
+        foreach my $ignore (@ignore_line) {
+            next LINE if $line =~ /$ignore/;
+        }
+

         my $skip = 0;
         if (is_non_verbose_build($line, $input[$i + 1], \$skip)) {
         my $skip = 0;
         if (is_non_verbose_build($line, $input[$i + 1], \$skip)) {

-            error_non_verbose_build($line);
-            $exit |= 1 << 2;
+            if (not $option_buildd) {
+                error_non_verbose_build($line);
+            } else {
+                $statistics{commands_nonverbose}++;
+            }
+            $exit |= $exit_code{non_verbose_build};

             next;
         }
         # Even if it's a verbose build, we might have to skip this line.
             next;
         }
         # Even if it's a verbose build, we might have to skip this line.


@@ -656,10 +911,14 @@ FILE: foreach my $file (@ARGV) {
         # Remove everything until and including the compiler command. Makes
         # checks easier and faster.
         $line =~ s/^.*?$cc_regex//o;
         # Remove everything until and including the compiler command. Makes
         # checks easier and faster.
         $line =~ s/^.*?$cc_regex//o;

+        # "([...] test.c)" is not detected as 'test.c' - fix this by removing
+        # the brace and similar characters.
+        $line =~ s/['")]+$//;

 
         # Skip unnecessary tests when only preprocessing.
         my $flag_preprocess = 0;
 
 
         # Skip unnecessary tests when only preprocessing.
         my $flag_preprocess = 0;
 

+        my $dependency = 0;

         my $preprocess = 0;
         my $compile    = 0;
         my $link       = 0;
         my $preprocess = 0;
         my $compile    = 0;
         my $link       = 0;


@@ -669,11 +928,25 @@ FILE: foreach my $file (@ARGV) {
             $preprocess      = 1;
             $flag_preprocess = 1 if $1 eq '-E';
             $compile         = 1 if $1 eq '-S' or $1 eq '-c';
             $preprocess      = 1;
             $flag_preprocess = 1 if $1 eq '-E';
             $compile         = 1 if $1 eq '-S' or $1 eq '-c';

+        # Dependency generation for Makefiles. The other flags (-MF -MG -MP
+        # -MT -MQ) are always used with -M/-MM.
+        } elsif ($line =~ /\s(?:-M|-MM)\b/) {
+            $dependency = 1;

         # Otherwise assume we are linking.
         } else {
             $link = 1;
         }
 
         # Otherwise assume we are linking.
         } else {
             $link = 1;
         }
 

+        # -MD/-MMD also cause dependency generation, but they don't imply -E!
+        if ($line =~ /\s(?:-MD|-MMD)\b/) {
+            $dependency      = 0;
+            $flag_preprocess = 0;
+        }
+
+        # Dependency generation for Makefiles, no preprocessing or other flags
+        # needed.
+        next if $dependency;
+

         # Get all file extensions on this line.
         my @extensions = $line =~ /$file_extension_regex/go;
         # Ignore all unknown extensions to speedup the search below.
         # Get all file extensions on this line.
         my @extensions = $line =~ /$file_extension_regex/go;
         # Ignore all unknown extensions to speedup the search below.


@@ -712,6 +985,13 @@ FILE: foreach my $file (@ARGV) {
             $compile_cpp = 1;
         }
 
             $compile_cpp = 1;
         }
 

+        if ($option_buildd) {
+            $statistics{preprocess}++  if $preprocess;
+            $statistics{compile}++     if $compile;
+            $statistics{compile_cpp}++ if $compile_cpp;
+            $statistics{link}++        if $link;
+        }
+

         # Check hardening flags.
         my @missing;
         if ($compile and not all_flags_used($line, \@missing, @cflags)
         # Check hardening flags.
         my @missing;
         if ($compile and not all_flags_used($line, \@missing, @cflags)


@@ -720,36 +1000,93 @@ FILE: foreach my $file (@ARGV) {
                 # are missing.
                 and not pic_pie_conflict($line, $harden_pie, \@missing, @def_cflags_pie)
                 # Assume dpkg-buildflags returns the correct flags.
                 # are missing.
                 and not pic_pie_conflict($line, $harden_pie, \@missing, @def_cflags_pie)
                 # Assume dpkg-buildflags returns the correct flags.

-                and not $line =~ /`dpkg-buildflags --get CFLAGS`/) {
-            error_flags('CFLAGS missing', \@missing, \%flag_renames, $input[$i]);
-            $exit |= 1 << 3;
+                and index($line, '`dpkg-buildflags --get CFLAGS`') == -1) {
+            if (not $option_buildd) {
+                error_flags('CFLAGS missing', \@missing, \%flag_renames, $input[$i]);
+            } else {
+                $statistics{compile_missing}++;
+            }
+            $exit |= $exit_code{flags_missing};

         } elsif ($compile_cpp and not all_flags_used($line, \@missing, @cflags)
                 # Libraries linked with -fPIC don't have to (and can't) be
                 # linked with -fPIE as well. It's no error if only PIE flags
                 # are missing.
                 and not pic_pie_conflict($line, $harden_pie, \@missing, @def_cflags_pie)
                 # Assume dpkg-buildflags returns the correct flags.
         } elsif ($compile_cpp and not all_flags_used($line, \@missing, @cflags)
                 # Libraries linked with -fPIC don't have to (and can't) be
                 # linked with -fPIE as well. It's no error if only PIE flags
                 # are missing.
                 and not pic_pie_conflict($line, $harden_pie, \@missing, @def_cflags_pie)
                 # Assume dpkg-buildflags returns the correct flags.

-                and not $line =~ /`dpkg-buildflags --get CXXFLAGS`/) {
-            error_flags('CXXFLAGS missing', \@missing, \%flag_renames, $input[$i]);
-            $exit |= 1 << 3;
+                and index($line, '`dpkg-buildflags --get CXXFLAGS`') == -1) {
+            if (not $option_buildd) {
+                error_flags('CXXFLAGS missing', \@missing, \%flag_renames, $input[$i]);
+            } else {
+                $statistics{compile_cpp_missing}++;
+            }
+            $exit |= $exit_code{flags_missing};

         }
         }

-        if ($preprocess and not all_flags_used($line, \@missing, @cppflags)
+        if ($preprocess
+                and (not all_flags_used($line, \@missing, @cppflags)
+                    # The fortify flag might be overwritten, detect that.
+                     or ($harden_fortify
+                         and cppflags_fortify_broken($line, \@missing)))

                 # Assume dpkg-buildflags returns the correct flags.
                 # Assume dpkg-buildflags returns the correct flags.

-                and not $line =~ /`dpkg-buildflags --get CPPFLAGS`/) {
-            error_flags('CPPFLAGS missing', \@missing, \%flag_renames, $input[$i]);
-            $exit |= 1 << 3;
+                and index($line, '`dpkg-buildflags --get CPPFLAGS`') == -1) {
+            if (not $option_buildd) {
+                error_flags('CPPFLAGS missing', \@missing, \%flag_renames, $input[$i]);
+            } else {
+                $statistics{preprocess_missing}++;
+            }
+            $exit |= $exit_code{flags_missing};

         }
         if ($link and not all_flags_used($line, \@missing, @ldflags)
                 # Same here, -fPIC conflicts with -fPIE.
                 and not pic_pie_conflict($line, $harden_pie, \@missing, @def_ldflags_pie)
                 # Assume dpkg-buildflags returns the correct flags.
         }
         if ($link and not all_flags_used($line, \@missing, @ldflags)
                 # Same here, -fPIC conflicts with -fPIE.
                 and not pic_pie_conflict($line, $harden_pie, \@missing, @def_ldflags_pie)
                 # Assume dpkg-buildflags returns the correct flags.

-                and not $line =~ /`dpkg-buildflags --get LDFLAGS`/) {
-            error_flags('LDFLAGS missing', \@missing, \%flag_renames, $input[$i]);
-            $exit |= 1 << 3;
+                and index($line, '`dpkg-buildflags --get LDFLAGS`') == -1) {
+            if (not $option_buildd) {
+                error_flags('LDFLAGS missing', \@missing, \%flag_renames, $input[$i]);
+            } else {
+                $statistics{link_missing}++;
+            }
+            $exit |= $exit_code{flags_missing};

         }
     }
 }
 
         }
     }
 }
 

+# Print statistics for buildd mode, only output in this mode.
+if ($option_buildd) {
+    my @warning;
+
+    if ($statistics{preprocess_missing}) {
+        push @warning, sprintf 'CPPFLAGS %d (of %d)',
+                               $statistics{preprocess_missing},
+                               $statistics{preprocess};
+    }
+    if ($statistics{compile_missing}) {
+        push @warning, sprintf 'CFLAGS %d (of %d)',
+                               $statistics{compile_missing},
+                               $statistics{compile};
+    }
+    if ($statistics{compile_cpp_missing}) {
+        push @warning, sprintf 'CXXFLAGS %d (of %d)',
+                               $statistics{compile_cpp_missing},
+                               $statistics{compile_cpp};
+    }
+    if ($statistics{link_missing}) {
+        push @warning, sprintf 'LDFLAGS %d (of %d)',
+                               $statistics{link_missing},
+                               $statistics{link};
+    }
+    if (scalar @warning) {
+        local $" = ', '; # array join string
+        print "$buildd_tag{flags_missing} @warning missing\n";
+    }
+
+    if ($statistics{commands_nonverbose}) {
+        printf "$buildd_tag{non_verbose_build} %d (of %d) hidden\n",
+               $statistics{commands_nonverbose},
+               $statistics{commands},
+    }
+}
+
+

 exit $exit;
 
 
 exit $exit;
 
 


@@ -761,21 +1098,18 @@ blhc - build log hardening check, checks build logs for missing hardening flags
 
 =head1 SYNOPSIS
 
 
 =head1 SYNOPSIS
 

-B<blhc> [options] <dpkg-buildpackage build log file>..
-
-    --all                   force +all (+pie, +bindnow) check
-    --arch                  set architecture (autodetected)
-    --bindnow               force +bindbow check
-    --buildd                parser mode for buildds
-    --color                 use colored output
-    --pie                   force +pie check
-    --help                  available options
-    --version               version number and license
+B<blhc> [I<options>] I<< <dpkg-buildpackage build log file>.. >>

 
 =head1 DESCRIPTION
 
 
 =head1 DESCRIPTION
 

-blhc is a small tool which checks build logs for missing hardening flags and
-other important warnings. It's licensed under the GPL 3 or later.
+blhc is a small tool which checks build logs for missing hardening flags. It's
+licensed under the GPL 3 or later.
+
+It's designed to check build logs generated by Debian's dpkg-buildpackage (or
+tools using dpkg-buildpackage like pbuilder or the official buildd build logs)
+to help maintainers detect missing hardening flags in their packages.
+
+If there's no output, no flags are missing and the build log is fine.

 
 =head1 OPTIONS
 
 
 =head1 OPTIONS
 


@@ -786,7 +1120,7 @@ other important warnings. It's licensed under the GPL 3 or later.
 Force check for all +all (+pie, +bindnow) hardening flags. By default it's
 auto detected.
 
 Force check for all +all (+pie, +bindnow) hardening flags. By default it's
 auto detected.
 

-=item B<--arch>
+=item B<--arch> I<architecture>

 
 Set the specific architecture (e.g. amd64, armel, etc.), automatically
 disables hardening flags not available on this architecture. Is detected
 
 Set the specific architecture (e.g. amd64, armel, etc.), automatically
 disables hardening flags not available on this architecture. Is detected


@@ -803,17 +1137,57 @@ changes are in effect:
 
 =over 2
 
 
 =over 2
 

-=item
+=item *
+
+Print tags instead of normal warnings, see L</"BUILDD TAGS"> for a list of
+possible tags.
+
+=item *

 
 Don't check hardening flags in old log files (if dpkg-dev << 1.16.1 is
 detected).
 
 
 Don't check hardening flags in old log files (if dpkg-dev << 1.16.1 is
 detected).
 

+=item *
+
+Don't require Term::ANSIColor.
+

 =back
 
 =item B<--color>
 
 Use colored (ANSI) output for warning messages.
 
 =back
 
 =item B<--color>
 
 Use colored (ANSI) output for warning messages.
 

+=item B<--ignore-arch> I<arch>
+
+Ignore build logs from architectures matching I<arch>. I<arch> is a string.
+
+Used to prevent false positives. This option can be specified multiple times.
+
+=item B<--ignore-arch-flag> I<arch>:I<flag>
+
+Like B<--ignore-flag>, but only ignore flag on I<arch>.
+
+=item B<--ignore-arch-line> I<arch>:I<line>
+
+Like B<--ignore-line>, but only ignore line on I<arch>.
+
+=item B<--ignore-flag> I<flag>
+
+Don't print an error when the specific flag is missing in a compiler line.
+I<flag> is a string.
+
+Used to prevent false positives. This option can be specified multiple times.
+
+=item B<--ignore-line> I<regex>
+
+Ignore lines matching the given Perl regex. I<regex> is automatically anchored
+at the beginning and end of the line to prevent false negatives.
+
+B<NOTE>: Not the input lines are checked, but the lines which are displayed in
+warnings (which have line continuation resolved).
+
+Used to prevent false positives. This option can be specified multiple times.
+

 =item B<--pie>
 
 Force check for all +pie hardening flags. By default it's auto detected.
 =item B<--pie>
 
 Force check for all +pie hardening flags. By default it's auto detected.


@@ -832,6 +1206,87 @@ Auto detection for B<--pie> and B<--bindnow> only works if at least one
 command uses the required hardening flag (e.g. -fPIE). Then it's required for
 all other commands as well.
 
 command uses the required hardening flag (e.g. -fPIE). Then it's required for
 all other commands as well.
 

+=head1 EXAMPLES
+
+Normal usage, parse a single log file.
+
+    blhc path/to/log/file
+
+If there's no output, no flags are missing and the build log is fine.
+
+Parse multiple log files. The exit code is ORed over all files.
+
+    blhc path/to/directory/with/log/files/*
+
+Don't treat missing C<-g> as error:
+
+    blhc --ignore-flag -g path/to/log/file
+
+Don't treat missing C<-pie> on kfreebsd-amd64 as error:
+
+    blhc --ignore-arch-flag kfreebsd-amd64:-pie path/to/log/file
+
+Ignore lines consisting exactly of C<./script gcc file> which would cause a
+false positive.
+
+    blhc --ignore-line '\./script gcc file' path/to/log/file
+
+Ignore lines matching C<./script gcc file> somewhere in the line.
+
+    blhc --ignore-line '.*\./script gcc file.*' path/to/log/file
+
+Use blhc with pbuilder.
+
+    pbuilder path/to/package.dsc | tee path/log/file
+    blhc path/to/file || echo flags missing
+
+=head1 BUILDD TAGS
+
+The following tags are used in I<--buildd> mode. In braces the additional data
+which is displayed.
+
+=over 2
+
+=item B<I-hardening-wrapper-used>
+
+The package uses hardening-wrapper which intercepts calls to gcc and adds
+hardening flags. The build log doesn't contain any hardening flags and thus
+can't be checked by blhc.
+
+=item B<W-compiler-flags-hidden> (summary of hidden lines)
+
+Build log contains lines which hide the real compiler flags. For example:
+
+    CC test-a.c
+    CC test-b.c
+    CC test-c.c
+    LD test
+
+Most of the time either C<export V=1> or C<export verbose=1> in
+F<debian/rules> fixes builds with hidden compiler flags. Sometimes C<.SILENT>
+in a F<Makefile> must be removed. And as last resort the F<Makefile> must be
+patched to remove the C<@>s hiding the real compiler commands.
+
+=item B<W-dpkg-buildflags-missing> (summary of missing flags)
+
+CPPFLAGS, CFLAGS, CXXFLAGS, LDFLAGS missing.
+
+=item B<I-invalid-cmake-used> (version)
+
+By default CMake ignores CPPFLAGS thus missing those hardening flags. Debian
+patched CMake in versions 2.8.7-1 and 2.8.7-2 to respect CPPFLAGS, but this
+patch was rejected by upstream and later reverted in Debian. Thus those two
+versions show correct usage of CPPFLAGS even if the package doesn't correctly
+handle them (for example by passing them to CFLAGS). To prevent false
+negatives just blacklist those two versions.
+
+=item B<I-no-compiler-commands>
+
+No compiler commands were detected. Either the log contains none or they were
+not correctly detected by blhc (please report the bug in this case).
+
+=back
+

 =head1 EXIT STATUS
 
 The exit status is a "bit mask", each listed status is ORed when the error
 =head1 EXIT STATUS
 
 The exit status is a "bit mask", each listed status is ORed when the error


@@ -863,12 +1318,20 @@ Missing hardening flags.
 
 Hardening wrapper detected, no tests performed.
 
 
 Hardening wrapper detected, no tests performed.
 

+=item B<32>
+
+Invalid CMake version used. See B<I-invalid-cmake-used> under L</"BUILDD
+TAGS"> for a detailed explanation.
+

 =back
 
 =head1 AUTHOR
 
 Simon Ruderich, E<lt>simon@ruderich.orgE<gt>
 
 =back
 
 =head1 AUTHOR
 
 Simon Ruderich, E<lt>simon@ruderich.orgE<gt>
 

+Thanks to to Bernhard R. Link E<lt>brlink@debian.orgE<gt> and Jaria Alto
+E<lt>jari.aalto@cante.netE<gt> for their valuable input and suggestions.
+

 =head1 COPYRIGHT AND LICENSE
 
 Copyright (C) 2012 by Simon Ruderich
 =head1 COPYRIGHT AND LICENSE
 
 Copyright (C) 2012 by Simon Ruderich


@@ -886,4 +1349,8 @@ GNU General Public License for more details.
 You should have received a copy of the GNU General Public License
 along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
 You should have received a copy of the GNU General Public License
 along with this program.  If not, see <http://www.gnu.org/licenses/>.
 

+=head1 SEE ALSO
+
+L<hardening-check(1)>, L<dpkg-buildflags(1)>
+

 =cut
 =cut