From ec6915157c741c96bfeed5a2a58246d59ccefdb5 Mon Sep 17 00:00:00 2001
From: Simon Ruderich <simon@ruderich.org>
Date: Sat, 17 Mar 2012 21:16:03 +0100
Subject: [PATCH] Improve line continuation to handle ignored lines correctly.

---
 bin/blhc             | 28 ++++++++++++++++++++--------
 t/logs/bad-multiline | 10 ++++++++++
 t/tests.t            |  5 +++--
 3 files changed, 33 insertions(+), 10 deletions(-)

diff --git a/bin/blhc b/bin/blhc
index 38ca653..d8c621b 100755
--- a/bin/blhc
+++ b/bin/blhc
@@ -266,6 +266,7 @@ my @input = ();
 
 my $start = 0;
 my $continuation = 0;
+my $complete_line = undef;
 while (my $line = <>) {
     # We skip over unimportant lines at the beginning to prevent false
     # positives.
@@ -297,10 +298,26 @@ while (my $line = <>) {
 
             # Join lines, but leave the "\" in place so it's clear where the
             # original line break was.
-            chomp $input[-1];
-            $input[-1] .= ' ' . $line;
+            chomp $complete_line;
+            $complete_line .= ' ' . $line;
+        }
+        # Line continuation, line ends with "\".
+        if ($line =~ /\\\s*$/) {
+            $continuation = 1;
+            # Start line continuation.
+            if (not defined $complete_line) {
+                $complete_line = $line;
+            }
+            next;
+        }
+
+        if (not $continuation) {
+            # Use the complete line if a line continuation occurred.
+            if (defined $complete_line) {
+                $line = $complete_line;
+                $complete_line = undef;
+            }
 
-        } else {
             # Ignore lines with no compiler commands.
             next if $line !~ /\b$cc_regex(?:\s|\\)/ and not $non_verbose;
 
@@ -311,11 +328,6 @@ while (my $line = <>) {
 
             push @input, $line;
         }
-
-        # Line continuation, line ends with "\".
-        if ($line =~ /\\\s*$/) {
-            $continuation = 1;
-        }
     }
 }
 
diff --git a/t/logs/bad-multiline b/t/logs/bad-multiline
index 91f63a6..ff7a826 100644
--- a/t/logs/bad-multiline
+++ b/t/logs/bad-multiline
@@ -30,3 +30,13 @@ gcc -g -O2 --param=ssp-buffer-size=4 -Wformat -Wformat-security -Werror=format-s
 gcc -D_FORTIFY_SOURCE=2 -fstack-protector -c test-b.c
 # Escaped ";" - not really useful, just to check it works.
 gcc -g -O2 -fstack-protector --param=ssp-buffer-size=4 -Wformat -Wformat-security \; -Werror=format-security -D_FORTIFY_SOURCE=1 -c test-a.c
+
+
+if ./bin-aux/missing --run makeinfo \
+    test.texi > test.info; \
+then \
+    echo good; \
+else
+    echo bad; \
+fi; \
+gcc -g -O2 -fstack-protector --param=ssp-buffer-size=4 -Wformat -Wformat-security -Werror=format-security -D_FORTIFY_SOURCE=1 -c test-b.c
diff --git a/t/tests.t b/t/tests.t
index 2a519a9..387ac2e 100644
--- a/t/tests.t
+++ b/t/tests.t
@@ -281,11 +281,12 @@ CFLAGS missing (-g -O2 -fstack-protector --param=ssp-buffer-size=4 -Wformat):  g
 CPPFLAGS missing (-D_FORTIFY_SOURCE=2):  gcc -Wformat-security -Werror=format-security -c test-b.c
 CFLAGS missing (-O2): gcc -g -fstack-protector --param=ssp-buffer-size=4 -Wformat -Wformat-security -Werror=format-security -c test-a.c
 CPPFLAGS missing (-D_FORTIFY_SOURCE=2): gcc -g -fstack-protector --param=ssp-buffer-size=4 -Wformat -Wformat-security -Werror=format-security -c test-a.c
-CFLAGS missing (-g -fstack-protector --param=ssp-buffer-size=4 -Wformat -Wformat-security -Werror=format-security): gcc -O2 -D_FORTIFY_SOURCE=2 -c test-b.c
+CFLAGS missing (-g -fstack-protector --param=ssp-buffer-size=4 -Wformat -Wformat-security -Werror=format-security): \ gcc -O2 -D_FORTIFY_SOURCE=2 -c test-b.c
 CFLAGS missing (-fstack-protector): gcc -g -O2 --param=ssp-buffer-size=4 -Wformat -Wformat-security -Werror=format-security -c test-a.c
 CPPFLAGS missing (-D_FORTIFY_SOURCE=2): gcc -g -O2 --param=ssp-buffer-size=4 -Wformat -Wformat-security -Werror=format-security -c test-a.c
-CFLAGS missing (-g -O2 --param=ssp-buffer-size=4 -Wformat -Wformat-security -Werror=format-security): gcc -D_FORTIFY_SOURCE=2 -fstack-protector -c test-b.c
+CFLAGS missing (-g -O2 --param=ssp-buffer-size=4 -Wformat -Wformat-security -Werror=format-security):  \ gcc -D_FORTIFY_SOURCE=2 -fstack-protector -c test-b.c
 CPPFLAGS missing (-D_FORTIFY_SOURCE=2): gcc -g -O2 -fstack-protector --param=ssp-buffer-size=4 -Wformat -Wformat-security \; -Werror=format-security -D_FORTIFY_SOURCE=1 -c test-a.c
+CPPFLAGS missing (-D_FORTIFY_SOURCE=2):  \ gcc -g -O2 -fstack-protector --param=ssp-buffer-size=4 -Wformat -Wformat-security -Werror=format-security -D_FORTIFY_SOURCE=1 -c test-b.c
 ';
 
 is_blhc 'bad-library', '--all', 8,
-- 
2.43.2