1# multiarch.m4 serial 5 2dnl Copyright (C) 2008, 2009 Free Software Foundation, Inc. 3dnl This file is free software; the Free Software Foundation 4dnl gives unlimited permission to copy and/or distribute it, 5dnl with or without modifications, as long as this notice is preserved. 6 7# Determine whether the compiler is or may be producing universal binaries. 8# 9# On MacOS X 10.5 and later systems, the user can create libraries and 10# executables that work on multiple system types--known as "fat" or 11# "universal" binaries--by specifying multiple '-arch' options to the 12# compiler but only a single '-arch' option to the preprocessor. Like 13# this: 14# 15# ./configure CC="gcc -arch i386 -arch x86_64 -arch ppc -arch ppc64" \ 16# CXX="g++ -arch i386 -arch x86_64 -arch ppc -arch ppc64" \ 17# CPP="gcc -E" CXXCPP="g++ -E" 18# 19# Detect this situation and set the macro AA_APPLE_UNIVERSAL_BUILD at the 20# beginning of config.h and set APPLE_UNIVERSAL_BUILD accordingly. 21 22AC_DEFUN_ONCE([gl_MULTIARCH], 23[ 24 dnl Code similar to autoconf-2.63 AC_C_BIGENDIAN. 25 gl_cv_c_multiarch=no 26 AC_COMPILE_IFELSE( 27 [AC_LANG_SOURCE( 28 [[#ifndef __APPLE_CC__ 29 not a universal capable compiler 30 #endif 31 typedef int dummy; 32 ]])], 33 [ 34 dnl Check for potential -arch flags. It is not universal unless 35 dnl there are at least two -arch flags with different values. 36 arch= 37 prev= 38 for word in ${CC} ${CFLAGS} ${CPPFLAGS} ${LDFLAGS}; do 39 if test -n "$prev"; then 40 case $word in 41 i?86 | x86_64 | ppc | ppc64) 42 if test -z "$arch" || test "$arch" = "$word"; then 43 arch="$word" 44 else 45 gl_cv_c_multiarch=yes 46 fi 47 ;; 48 esac 49 prev= 50 else 51 if test "x$word" = "x-arch"; then 52 prev=arch 53 fi 54 fi 55 done 56 ]) 57 if test $gl_cv_c_multiarch = yes; then 58 AC_DEFINE([AA_APPLE_UNIVERSAL_BUILD], [1], 59 [Define if the compiler is building for multiple architectures of Apple platforms at once.]) 60 APPLE_UNIVERSAL_BUILD=1 61 else 62 APPLE_UNIVERSAL_BUILD=0 63 fi 64 AC_SUBST([APPLE_UNIVERSAL_BUILD]) 65]) 66