3 dnl Copyright (C) 2008-2024 Free Software Foundation, Inc.
4 dnl This file is free software; the Free Software Foundation
5 dnl gives unlimited permission to copy and/or distribute it,
6 dnl with or without modifications, as long as this notice is preserved.
8 # Determine whether the compiler is or may be producing universal binaries.
10 # On Mac OS X 10.5 and later systems, the user can create libraries and
11 # executables that work on multiple system types--known as "fat" or
12 # "universal" binaries--by specifying multiple '-arch' options to the
13 # compiler but only a single '-arch' option to the preprocessor. Like
16 # ./configure CC="gcc -arch i386 -arch x86_64 -arch ppc -arch ppc64" \
17 # CXX="g++ -arch i386 -arch x86_64 -arch ppc -arch ppc64" \
18 # CPP="gcc -E" CXXCPP="g++ -E"
20 # Detect this situation and set APPLE_UNIVERSAL_BUILD accordingly.
22 AC_DEFUN_ONCE([gl_MULTIARCH],
24 dnl Code similar to autoconf-2.63 AC_C_BIGENDIAN.
25 AC_CACHE_CHECK([whether the compiler produces multi-arch binaries],
30 [[#ifndef __APPLE_CC__
31 not a universal capable compiler
36 dnl Check for potential -arch flags. It is not universal unless
37 dnl there are at least two -arch flags with different values.
40 for word in ${CC} ${CFLAGS} ${CPPFLAGS} ${LDFLAGS}; do
41 if test -n "$prev"; then
43 i?86 | x86_64 | ppc | ppc64 | arm | arm64)
44 if test -z "$arch" || test "$arch" = "$word"; then
53 if test "x$word" = "x-arch"; then
60 if test $gl_cv_c_multiarch = yes; then
61 APPLE_UNIVERSAL_BUILD=1
63 APPLE_UNIVERSAL_BUILD=0
65 AC_SUBST([APPLE_UNIVERSAL_BUILD])