MacOS X: Enable 4-way universal builds

This patch adds a new configure argument on OSX:
        --with-universal-archs=[32-bit|64-bit|all]

When used with the --enable-universalsdk option this controls which
CPU architectures are includes in the framework. The default is 32-bit,
meaning i386 and ppc. The most useful alternative is 'all', which includes
all 4 CPU architectures supported by MacOS X (i386, ppc, x86_64 and ppc64).

This includes limited support for the Carbon bindings in 64-bit mode as well,
limited because (a) I haven't done extensive testing and (b) a large portion
of the Carbon API's aren't available in 64-bit mode anyway.

I've also duplicated a feature of Apple's build of python: setting the
environment variable 'ARCHFLAGS' controls the '-arch' flags used for building
extensions using distutils.

1 files changed, 7 insertions, 1 deletions

diff --git a/Lib/distutils/unixccompiler.py b/Lib/distutils/unixccompiler.py
index dc759ee..6144efc 100644
--- a/Lib/distutils/unixccompiler.py
+++ b/Lib/distutils/unixccompiler.py
@@ -64,7 +64,7 @@ def _darwin_compiler_fixup(compiler_so, cc_args):
         stripArch = '-arch' in cc_args
         stripSysroot = '-isysroot' in cc_args
 
-    if stripArch:
+    if stripArch or 'ARCHFLAGS' in os.environ:
         while 1:
             try:
                 index = compiler_so.index('-arch')
@@ -73,6 +73,12 @@ def _darwin_compiler_fixup(compiler_so, cc_args):
             except ValueError:
                 break
 
+    if 'ARCHFLAGS' in os.environ and not stripArch:
+        # User specified different -arch flags in the environ,
+        # see also distutils.sysconfig
+        compiler_so = compiler_so + ' ' + os.environ['ARCHFLAGS']
+
+
     if stripSysroot:
         try:
             index = compiler_so.index('-isysroot')