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1 # multiarch.m4 serial 3
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2 dnl Copyright (C) 2008 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 MacOS 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 the macro AA_APPLE_UNIVERSAL_BUILD at the
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20 # beginning of config.h and set APPLE_UNIVERSAL_BUILD accordingly.
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21
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22 AC_DEFUN([gl_MULTIARCH],
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23 [
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24 dnl This AC_REQUIRE is not necessary in theory. It works around a bug in
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25 dnl autoconf <= 2.63: AC_REQUIRE invocations inside AC_REQUIREd macros are
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26 dnl being handled better than AC_REQUIRE invocations inside normally invoked
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27 dnl macros.
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28 AC_REQUIRE([gl_MULTIARCH_BODY])
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29 ])
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30
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31 AC_DEFUN([gl_MULTIARCH_BODY],
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32 [
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33 dnl Code similar to autoconf-2.63 AC_C_BIGENDIAN.
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34 gl_cv_c_multiarch=no
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35 AC_COMPILE_IFELSE(
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36 [AC_LANG_SOURCE(
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37 [[#ifndef __APPLE_CC__
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38 not a universal capable compiler
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39 #endif
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40 typedef int dummy;
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41 ]])],
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42 [
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43 dnl Check for potential -arch flags. It is not universal unless
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44 dnl there are at least two -arch flags with different values.
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45 arch=
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46 prev=
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47 for word in ${CC} ${CFLAGS} ${CPPFLAGS} ${LDFLAGS}; do
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48 if test -n "$prev"; then
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49 case $word in
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50 i?86 | x86_64 | ppc | ppc64)
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51 if test -z "$arch" || test "$arch" = "$word"; then
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52 arch="$word"
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53 else
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54 gl_cv_c_multiarch=yes
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55 fi
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56 ;;
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57 esac
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58 prev=
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59 else
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60 if test "x$word" = "x-arch"; then
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61 prev=arch
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62 fi
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63 fi
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64 done
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65 ])
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66 if test $gl_cv_c_multiarch = yes; then
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67 AC_DEFINE([AA_APPLE_UNIVERSAL_BUILD], [1],
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68 [Define if the compiler is building for multiple architectures of Apple platforms at once.])
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69 APPLE_UNIVERSAL_BUILD=1
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70 else
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71 APPLE_UNIVERSAL_BUILD=0
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72 fi
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73 AC_SUBST([APPLE_UNIVERSAL_BUILD])
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74 ])
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