From 011e8fb476b5fb27c9aa613360d918aa0b798b3d Mon Sep 17 00:00:00 2001
From: Niko Tyni <ntyni@debian.org>
Date: Thu, 28 Apr 2011 09:18:54 +0300
Subject: [PATCH] Append CFLAGS and LDFLAGS to their Config.pm counterparts in
 EU::CBuilder

Since ExtUtils::CBuilder 0.27_04 (bleadperl commit 06e8058f27e4),
CFLAGS and LDFLAGS from the environment have overridden the Config.pm
ccflags and ldflags settings. This can cause binary incompatibilities
between the core Perl and extensions built with EU::CBuilder.

Append to the Config.pm values rather than overriding them.
---
 .../lib/ExtUtils/CBuilder/Base.pm             |  6 +++--
 dist/ExtUtils-CBuilder/t/04-base.t            | 25 ++++++++++++++++++-
 2 files changed, 28 insertions(+), 3 deletions(-)

diff --git a/dist/ExtUtils-CBuilder/lib/ExtUtils/CBuilder/Base.pm b/dist/ExtUtils-CBuilder/lib/ExtUtils/CBuilder/Base.pm
index b57231272a64..2255c5125926 100644
--- a/dist/ExtUtils-CBuilder/lib/ExtUtils/CBuilder/Base.pm
+++ b/dist/ExtUtils-CBuilder/lib/ExtUtils/CBuilder/Base.pm
@@ -40,11 +40,13 @@ sub new {
     $self->{config}{$k} = $v unless exists $self->{config}{$k};
   }
   $self->{config}{cc} = $ENV{CC} if defined $ENV{CC};
-  $self->{config}{ccflags} = $ENV{CFLAGS} if defined $ENV{CFLAGS};
+  $self->{config}{ccflags} = join(" ", $self->{config}{ccflags}, $ENV{CFLAGS})
+     if defined $ENV{CFLAGS};
   $self->{config}{cxx} = $ENV{CXX} if defined $ENV{CXX};
   $self->{config}{cxxflags} = $ENV{CXXFLAGS} if defined $ENV{CXXFLAGS};
   $self->{config}{ld} = $ENV{LD} if defined $ENV{LD};
-  $self->{config}{ldflags} = $ENV{LDFLAGS} if defined $ENV{LDFLAGS};
+  $self->{config}{ldflags} = join(" ", $self->{config}{ldflags}, $ENV{LDFLAGS})
+     if defined $ENV{LDFLAGS};
 
   unless ( exists $self->{config}{cxx} ) {
     my ($ccpath, $ccbase, $ccsfx ) = fileparse($self->{config}{cc}, qr/\.[^.]*/);
diff --git a/dist/ExtUtils-CBuilder/t/04-base.t b/dist/ExtUtils-CBuilder/t/04-base.t
index db0ef984d43d..49819a178a32 100644
--- a/dist/ExtUtils-CBuilder/t/04-base.t
+++ b/dist/ExtUtils-CBuilder/t/04-base.t
@@ -1,7 +1,7 @@
 #! perl -w
 
 use strict;
-use Test::More tests => 50;
+use Test::More tests => 64;
 use Config;
 use Cwd;
 use File::Path qw( mkpath );
@@ -328,6 +328,29 @@ is_deeply( $mksymlists_args,
     "_prepare_mksymlists_args(): got expected arguments for Mksymlists",
 );
 
+my %testvars = (
+    CFLAGS  => 'ccflags',
+    LDFLAGS => 'ldflags',
+);
+
+while (my ($VAR, $var) = each %testvars) {
+    local $ENV{$VAR};
+    $base = ExtUtils::CBuilder::Base->new( quiet => 1 );
+    ok( $base, "ExtUtils::CBuilder::Base->new() returned true value" );
+    isa_ok( $base, 'ExtUtils::CBuilder::Base' );
+    like($base->{config}{$var}, qr/\Q$Config{$var}/,
+        "honours $var from Config.pm");
+
+    $ENV{$VAR} = "-foo -bar";
+    $base = ExtUtils::CBuilder::Base->new( quiet => 1 );
+    ok( $base, "ExtUtils::CBuilder::Base->new() returned true value" );
+    isa_ok( $base, 'ExtUtils::CBuilder::Base' );
+    like($base->{config}{$var}, qr/\Q$ENV{$VAR}/,
+        "honours $VAR from the environment");
+    like($base->{config}{$var}, qr/\Q$Config{$var}/,
+        "doesn't override $var from Config.pm with $VAR from the environment");
+}
+
 #####
 
 for ($source_file, $object_file, $lib_file) {