# HG changeset patch
# User Bruno Haible <bruno@clisp.org>
# Date 1230229538 -3600
# Node ID 51f263fdecd95d94402a6cd72b7b332540840a11
# Parent  4c304a656b8773dfcbc7cd6d11040e0d7a5d0547
New module 'multiarch'.

diff --git a/ChangeLog b/ChangeLog
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,9 @@
+2008-12-25  Bruno Haible  <bruno@clisp.org>
+
+	New module 'multiarch'.
+	* modules/multiarch: New file.
+	* m4/multiarch.m4: New file.
+
 2008-12-25  Bruno Haible  <bruno@clisp.org>
 
 	* gnulib-tool (func_create_testdir): Avoid failure of mv command.
diff --git a/m4/multiarch.m4 b/m4/multiarch.m4
new file mode 100644
--- /dev/null
+++ b/m4/multiarch.m4
@@ -0,0 +1,65 @@
+# multiarch.m4 serial 1
+dnl Copyright (C) 2008 Free Software Foundation, Inc.
+dnl This file is free software; the Free Software Foundation
+dnl gives unlimited permission to copy and/or distribute it,
+dnl with or without modifications, as long as this notice is preserved.
+
+# Determine whether the compiler is or may be producing universal binaries.
+#
+# On MacOS X 10.5 and later systems, the user can create libraries and
+# executables that work on multiple system types--known as "fat" or
+# "universal" binaries--by specifying multiple '-arch' options to the
+# compiler but only a single '-arch' option to the preprocessor.  Like
+# this:
+#
+#     ./configure CC="gcc -arch i386 -arch x86_64 -arch ppc -arch ppc64" \
+#                 CXX="g++ -arch i386 -arch x86_64 -arch ppc -arch ppc64" \
+#                 CPP="gcc -E" CXXCPP="g++ -E"
+#
+# Detect this situation and set the macro AA_APPLE_UNIVERSAL_BUILD at the
+# beginning of config.h and set APPLE_UNIVERSAL_BUILD accordingly.
+
+AC_DEFUN([gl_MULTIARCH],
+[
+  dnl Code similar to autoconf-2.63 AC_C_BIGENDIAN.
+  gl_cv_c_multiarch=no
+  AC_COMPILE_IFELSE(
+    [AC_LANG_SOURCE(
+      [[#ifndef __APPLE_CC__
+         not a universal capable compiler
+        #endif
+        typedef int dummy;
+      ]])],
+    [
+     dnl Check for potential -arch flags.  It is not universal unless
+     dnl there are at least two -arch flags with different values.
+     arch=
+     prev=
+     for word in ${CC} ${CFLAGS} ${CPPFLAGS} ${LDFLAGS}; do
+       if test -n "$prev"; then
+         case $word in
+           i386 | x86_64 | ppc | ppc64)
+             if test -z "$arch" || test "$arch" = "$word"; then
+               arch="$word"
+             else
+               gl_cv_c_multiarch=yes
+             fi
+             ;;
+         esac
+         prev=
+       else
+         if test "x$word" = "x-arch"; then
+           prev=arch
+         fi
+       fi
+     done
+    ])
+  if test $gl_cv_c_multiarch = yes; then
+    AC_DEFINE([AA_APPLE_UNIVERSAL_BUILD], [1],
+      [Define if the compiler is building for multiple architectures of Apple platforms at once.])
+    APPLE_UNIVERSAL_BUILD=1
+  else
+    APPLE_UNIVERSAL_BUILD=0
+  fi
+  AC_SUBST([APPLE_UNIVERSAL_BUILD])
+])
diff --git a/modules/multiarch b/modules/multiarch
new file mode 100644
--- /dev/null
+++ b/modules/multiarch
@@ -0,0 +1,21 @@
+Description:
+Detection of multi-architecture ("universal binary") builds.
+
+Files:
+m4/multiarch.m4
+
+Depends-on:
+
+configure.ac:
+gl_MULTIARCH
+
+Makefile.am:
+
+Include:
+
+License:
+unlimited
+
+Maintainer:
+Bruno Haible, autoconf
+