| 1 | # multiarch.m4 serial 9
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| 2 | dnl Copyright (C) 2008-2021 Free Software Foundation, Inc.
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| 3 | dnl This file is free software; the Free Software Foundation
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| 4 | dnl gives unlimited permission to copy and/or distribute it,
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| 5 | dnl with or without modifications, as long as this notice is preserved.
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| 6 |
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| 7 | # Determine whether the compiler is or may be producing universal binaries.
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| 8 | #
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| 9 | # On Mac OS X 10.5 and later systems, the user can create libraries and
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| 10 | # executables that work on multiple system types--known as "fat" or
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| 11 | # "universal" binaries--by specifying multiple '-arch' options to the
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| 12 | # compiler but only a single '-arch' option to the preprocessor. Like
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| 13 | # this:
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| 14 | #
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| 15 | # ./configure CC="gcc -arch i386 -arch x86_64 -arch ppc -arch ppc64" \
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| 16 | # CXX="g++ -arch i386 -arch x86_64 -arch ppc -arch ppc64" \
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| 17 | # CPP="gcc -E" CXXCPP="g++ -E"
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| 18 | #
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| 19 | # Detect this situation and set APPLE_UNIVERSAL_BUILD accordingly.
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| 20 |
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| 21 | AC_DEFUN_ONCE([gl_MULTIARCH],
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| 22 | [
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| 23 | dnl Code similar to autoconf-2.63 AC_C_BIGENDIAN.
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| 24 | AC_CACHE_CHECK([whether the compiler produces multi-arch binaries],
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| 25 | [gl_cv_c_multiarch],
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| 26 | [gl_cv_c_multiarch=no
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| 27 | AC_COMPILE_IFELSE(
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| 28 | [AC_LANG_SOURCE(
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| 29 | [[#ifndef __APPLE_CC__
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| 30 | not a universal capable compiler
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| 31 | #endif
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| 32 | typedef int dummy;
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| 33 | ]])],
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| 34 | [
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| 35 | dnl Check for potential -arch flags. It is not universal unless
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| 36 | dnl there are at least two -arch flags with different values.
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| 37 | arch=
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| 38 | prev=
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| 39 | for word in ${CC} ${CFLAGS} ${CPPFLAGS} ${LDFLAGS}; do
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| 40 | if test -n "$prev"; then
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| 41 | case $word in
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| 42 | i?86 | x86_64 | ppc | ppc64 | arm | arm64)
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| 43 | if test -z "$arch" || test "$arch" = "$word"; then
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| 44 | arch="$word"
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| 45 | else
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| 46 | gl_cv_c_multiarch=yes
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| 47 | fi
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| 48 | ;;
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| 49 | esac
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| 50 | prev=
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| 51 | else
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| 52 | if test "x$word" = "x-arch"; then
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| 53 | prev=arch
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| 54 | fi
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| 55 | fi
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| 56 | done
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| 57 | ])
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| 58 | ])
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| 59 | if test $gl_cv_c_multiarch = yes; then
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| 60 | APPLE_UNIVERSAL_BUILD=1
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| 61 | else
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| 62 | APPLE_UNIVERSAL_BUILD=0
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| 63 | fi
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| 64 | AC_SUBST([APPLE_UNIVERSAL_BUILD])
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| 65 | ])
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