Force linking against the perl dll when using gcc 3.4 on Windows

When a Windows perl links an XS shared object to an import library using
gcc/g++ version 3.4.x, strange breakage happens at load time because the
mutex-related symbols seems not to be reachable. This situation happens
especially for AS perl and the default compiler suite it installs.

We fix this by forcing g++ to link against the dll instead, which should
be in the same directory as the perl executable (at least for AS perl).

This (should) fix RT #51483.

diff --git a/Makefile.PL b/Makefile.PL
index cef05b243960677eb4be4031f21aff54c6cd4086..93598a12ae03c4039ae9da44604663be90be4e92 100644 (file)
--- a/Makefile.PL
+++ b/Makefile.PL
@@ -11,6 +11,7 @@ BEGIN {
 }
 
 my @DEFINES;
+my %macro;
 
 my $pl = $Config{perl_patchlevel};
 print "Checking perl patchlevel... ";
@@ -48,6 +49,25 @@ if ($^V ge v5.11.0 and not defined $pl) {
 }
 print $is_5110rel ? "yes\n" : "no\n";
 
+my $is_gcc_34 = 0;
+print "Checking if this is gcc 3.4 on Windows trying to link against an import library... ";
+if ($^O eq 'MSWin32' and not grep /^LD[A-Z]*=/, @ARGV) {
+ my ($libperl, $gccversion) = map $_ || '', @Config{qw/libperl gccversion/};
+ if ($gccversion =~ /^3\.4\.[0-9]+/ and $libperl =~ s/\.lib$//) {
+  $is_gcc_34 = 1;
+  my ($lddlflags, $ldflags) = @Config{qw/lddlflags ldflags/};
+  $_ ||= '', s/-L(?:".*?"|\S+)//g for $lddlflags, $ldflags;
+  $libperl = "-l$libperl";
+  my $libdirs = join ' ',
+                 map { s/(?<!\\)((?:\\\\)*")/\\$1/g; qq[-L"$_"] }
+                  @Config{qw/bin sitebin/};
+  $macro{LDDLFLAGS}    = "$lddlflags $libdirs $libperl";
+  $macro{LDFLAGS}      = "$ldflags $libdirs $libperl";
+  $macro{PERL_ARCHIVE} = '',
+ }
+}
+print $is_gcc_34 ? "yes\n" : "no\n";
+
 # Threads, Windows and 5.8.x don't seem to be best friends
 if ($^O eq 'MSWin32' && $^V lt v5.9.0) {
  push @DEFINES, '-DVMG_MULTIPLICITY=0';
@@ -61,6 +81,7 @@ if ($^O eq 'MSWin32' && $^V lt v5.10.1) {
 }
 
 @DEFINES = (DEFINE => join ' ', @DEFINES) if @DEFINES;
+%macro   = (macro  => { %macro })         if %macro; # Beware of the circle
 
 my $dist = 'Variable-Magic';
 
@@ -115,4 +136,5 @@ WriteMakefile(
  clean            => {
   FILES => "$dist-* *.gcov *.gcda *.gcno cover_db Debian_CPANTS.txt"
  },
+ %macro,
 );