Document linker command detection regex.

diff --git a/bin/blhc b/bin/blhc
index 6f9107474c16daed7040ceca6f523e94e90e8d02..9c3347c8eb9e510370562ae12401901655bffdf9 100755 (executable)
--- a/bin/blhc
+++ b/bin/blhc
@@ -275,7 +275,13 @@ foreach my $line (@input) {
     my $linker   = 0;
 
     # Linker commands.
-    if ($line =~ m{\s-o\s+(\\\s+)*([A-Za-z0-9_/.-]+/)?[A-Za-z0-9_-]+(\.so([0-9.])*|\.la)?(\s|\\|\$)}
+    if ($line =~ m{\s-o\s+               # -o
+                   (\\\s+)*              # possible line continuation
+                   ([A-Za-z0-9_/.-]+/)?  # path to file
+                   [A-Za-z0-9_-]+        # binary name (no dots!)
+                   (\.so([0-9.])*|\.la)? # library (including version)
+                   (\s|\\|\$)            # end of file name
+                  }x
             or $line =~ /^libtool: link: /
             or $line =~ m{\s*/bin/bash .+?libtool\s+(.+?\s+)?--mode=(re)?link}) {
         $compiler = 0;