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- # multiarch.m4 serial 9
- dnl Copyright (C) 2008-2021 Free Software Foundation, Inc.
- dnl This file is free software; the Free Software Foundation
- dnl gives unlimited permission to copy and/or distribute it,
- dnl with or without modifications, as long as this notice is preserved.
- # Determine whether the compiler is or may be producing universal binaries.
- #
- # On Mac OS X 10.5 and later systems, the user can create libraries and
- # executables that work on multiple system types--known as "fat" or
- # "universal" binaries--by specifying multiple '-arch' options to the
- # compiler but only a single '-arch' option to the preprocessor. Like
- # this:
- #
- # ./configure CC="gcc -arch i386 -arch x86_64 -arch ppc -arch ppc64" \
- # CXX="g++ -arch i386 -arch x86_64 -arch ppc -arch ppc64" \
- # CPP="gcc -E" CXXCPP="g++ -E"
- #
- # Detect this situation and set APPLE_UNIVERSAL_BUILD accordingly.
- AC_DEFUN_ONCE([gl_MULTIARCH],
- [
- dnl Code similar to autoconf-2.63 AC_C_BIGENDIAN.
- AC_CACHE_CHECK([whether the compiler produces multi-arch binaries],
- [gl_cv_c_multiarch],
- [gl_cv_c_multiarch=no
- AC_COMPILE_IFELSE(
- [AC_LANG_SOURCE(
- [[#ifndef __APPLE_CC__
- not a universal capable compiler
- #endif
- typedef int dummy;
- ]])],
- [
- dnl Check for potential -arch flags. It is not universal unless
- dnl there are at least two -arch flags with different values.
- arch=
- prev=
- for word in ${CC} ${CFLAGS} ${CPPFLAGS} ${LDFLAGS}; do
- if test -n "$prev"; then
- case $word in
- i?86 | x86_64 | ppc | ppc64 | arm | arm64)
- if test -z "$arch" || test "$arch" = "$word"; then
- arch="$word"
- else
- gl_cv_c_multiarch=yes
- fi
- ;;
- esac
- prev=
- else
- if test "x$word" = "x-arch"; then
- prev=arch
- fi
- fi
- done
- ])
- ])
- if test $gl_cv_c_multiarch = yes; then
- APPLE_UNIVERSAL_BUILD=1
- else
- APPLE_UNIVERSAL_BUILD=0
- fi
- AC_SUBST([APPLE_UNIVERSAL_BUILD])
- ])
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