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+# multiarch.m4 serial 5
+dnl Copyright (C) 2008, 2009 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_ONCE([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 $word in
+ i?86 | x86_64 | ppc | ppc64)
+ if test -z "$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])
+])