1 # multiarch.m4 serial 7 2 dnl Copyright (C) 2008-2012 Free Software Foundation, Inc. 3 dnl This file is free software; the Free Software Foundation 4 dnl gives unlimited permission to copy and/or distribute it, 5 dnl 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 Mac OS 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 APPLE_UNIVERSAL_BUILD accordingly. 20 21 AC_DEFUN_ONCE([gl_MULTIARCH], 22 [ 23 dnl Code similar to autoconf-2.63 AC_C_BIGENDIAN. 24 gl_cv_c_multiarch=no 25 AC_COMPILE_IFELSE( 26 [AC_LANG_SOURCE( 27 [[#ifndef __APPLE_CC__ 28 not a universal capable compiler 29 #endif 30 typedef int dummy; 31 ]])], 32 [ 33 dnl Check for potential -arch flags. It is not universal unless 34 dnl there are at least two -arch flags with different values. 35 arch= 36 prev= 37 for word in ${CC} ${CFLAGS} ${CPPFLAGS} ${LDFLAGS}; do 38 if test -n "$prev"; then 39 case $word in 40 i?86 | x86_64 | ppc | ppc64) 41 if test -z "$arch" || test "$arch" = "$word"; then 42 arch="$word" 43 else 44 gl_cv_c_multiarch=yes 45 fi 46 ;; 47 esac 48 prev= 49 else 50 if test "x$word" = "x-arch"; then 51 prev=arch 52 fi 53 fi 54 done 55 ]) 56 if test $gl_cv_c_multiarch = yes; then 57 APPLE_UNIVERSAL_BUILD=1 58 else 59 APPLE_UNIVERSAL_BUILD=0 60 fi 61 AC_SUBST([APPLE_UNIVERSAL_BUILD]) 62 ]) 63
