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62 lines
1.9 KiB
62 lines
1.9 KiB
# multiarch.m4 serial 7 |
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dnl Copyright (C) 2008-2017 Free Software Foundation, Inc. |
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dnl This file is free software; the Free Software Foundation |
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dnl gives unlimited permission to copy and/or distribute it, |
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dnl with or without modifications, as long as this notice is preserved. |
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# Determine whether the compiler is or may be producing universal binaries. |
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# |
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# On Mac OS X 10.5 and later systems, the user can create libraries and |
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# executables that work on multiple system types--known as "fat" or |
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# "universal" binaries--by specifying multiple '-arch' options to the |
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# compiler but only a single '-arch' option to the preprocessor. Like |
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# this: |
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# |
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# ./configure CC="gcc -arch i386 -arch x86_64 -arch ppc -arch ppc64" \ |
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# CXX="g++ -arch i386 -arch x86_64 -arch ppc -arch ppc64" \ |
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# CPP="gcc -E" CXXCPP="g++ -E" |
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# |
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# Detect this situation and set APPLE_UNIVERSAL_BUILD accordingly. |
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AC_DEFUN_ONCE([gl_MULTIARCH], |
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[ |
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dnl Code similar to autoconf-2.63 AC_C_BIGENDIAN. |
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gl_cv_c_multiarch=no |
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AC_COMPILE_IFELSE( |
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[AC_LANG_SOURCE( |
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[[#ifndef __APPLE_CC__ |
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not a universal capable compiler |
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#endif |
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typedef int dummy; |
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]])], |
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[ |
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dnl Check for potential -arch flags. It is not universal unless |
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dnl there are at least two -arch flags with different values. |
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arch= |
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prev= |
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for word in ${CC} ${CFLAGS} ${CPPFLAGS} ${LDFLAGS}; do |
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if test -n "$prev"; then |
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case $word in |
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i?86 | x86_64 | ppc | ppc64) |
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if test -z "$arch" || test "$arch" = "$word"; then |
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arch="$word" |
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else |
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gl_cv_c_multiarch=yes |
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fi |
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;; |
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esac |
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prev= |
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else |
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if test "x$word" = "x-arch"; then |
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prev=arch |
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fi |
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fi |
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done |
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]) |
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if test $gl_cv_c_multiarch = yes; then |
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APPLE_UNIVERSAL_BUILD=1 |
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else |
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APPLE_UNIVERSAL_BUILD=0 |
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fi |
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AC_SUBST([APPLE_UNIVERSAL_BUILD]) |
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])
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