declare smobs in alloc.c
[bpt/emacs.git] / m4 / multiarch.m4
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05730648 1# multiarch.m4 serial 7
ba318903 2dnl Copyright (C) 2008-2014 Free Software Foundation, Inc.
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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#
05730648 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
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#
b06b1098 19# Detect this situation and set APPLE_UNIVERSAL_BUILD accordingly.
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20
21AC_DEFUN_ONCE([gl_MULTIARCH],
22[
23 dnl Code similar to autoconf-2.63 AC_C_BIGENDIAN.
24 gl_cv_c_multiarch=no
25 AC_COMPILE_IFELSE(
26 [AC_LANG_SOURCE(
27 [[#ifndef __APPLE_CC__
28 not a universal capable compiler
29 #endif
30 typedef int dummy;
31 ]])],
32 [
33 dnl Check for potential -arch flags. It is not universal unless
34 dnl there are at least two -arch flags with different values.
35 arch=
36 prev=
37 for word in ${CC} ${CFLAGS} ${CPPFLAGS} ${LDFLAGS}; do
38 if test -n "$prev"; then
39 case $word in
40 i?86 | x86_64 | ppc | ppc64)
41 if test -z "$arch" || test "$arch" = "$word"; then
42 arch="$word"
43 else
44 gl_cv_c_multiarch=yes
45 fi
46 ;;
47 esac
48 prev=
49 else
50 if test "x$word" = "x-arch"; then
51 prev=arch
52 fi
53 fi
54 done
55 ])
56 if test $gl_cv_c_multiarch = yes; then
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57 APPLE_UNIVERSAL_BUILD=1
58 else
59 APPLE_UNIVERSAL_BUILD=0
60 fi
61 AC_SUBST([APPLE_UNIVERSAL_BUILD])
62])