1# multiarch.m4 serial 9 2dnl Copyright (C) 2008-2021 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 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 21AC_DEFUN_ONCE([gl_MULTIARCH], 22[ 23 dnl Code similar to autoconf-2.63 AC_C_BIGENDIAN. 24 AC_CACHE_CHECK([whether the compiler produces multi-arch binaries], 25 [gl_cv_c_multiarch], 26 [gl_cv_c_multiarch=no 27 AC_COMPILE_IFELSE( 28 [AC_LANG_SOURCE( 29 [[#ifndef __APPLE_CC__ 30 not a universal capable compiler 31 #endif 32 typedef int dummy; 33 ]])], 34 [ 35 dnl Check for potential -arch flags. It is not universal unless 36 dnl there are at least two -arch flags with different values. 37 arch= 38 prev= 39 for word in ${CC} ${CFLAGS} ${CPPFLAGS} ${LDFLAGS}; do 40 if test -n "$prev"; then 41 case $word in 42 i?86 | x86_64 | ppc | ppc64 | arm | arm64) 43 if test -z "$arch" || test "$arch" = "$word"; then 44 arch="$word" 45 else 46 gl_cv_c_multiarch=yes 47 fi 48 ;; 49 esac 50 prev= 51 else 52 if test "x$word" = "x-arch"; then 53 prev=arch 54 fi 55 fi 56 done 57 ]) 58 ]) 59 if test $gl_cv_c_multiarch = yes; then 60 APPLE_UNIVERSAL_BUILD=1 61 else 62 APPLE_UNIVERSAL_BUILD=0 63 fi 64 AC_SUBST([APPLE_UNIVERSAL_BUILD]) 65]) 66