2010-05-23 00:57:01 +00:00
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# multiarch.m4 serial 5
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2012-04-18 12:09:39 +00:00
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dnl Copyright (C) 2008, 2009, 2010 Free Software Foundation, Inc.
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2010-05-23 00:57:01 +00:00
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dnl This file is free software; the Free Software Foundation
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dnl gives unlimited permission to copy and/or distribute it,
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dnl with or without modifications, as long as this notice is preserved.
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# Determine whether the compiler is or may be producing universal binaries.
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#
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# On MacOS X 10.5 and later systems, the user can create libraries and
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# executables that work on multiple system types--known as "fat" or
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# "universal" binaries--by specifying multiple '-arch' options to the
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# compiler but only a single '-arch' option to the preprocessor. Like
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# this:
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#
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# ./configure CC="gcc -arch i386 -arch x86_64 -arch ppc -arch ppc64" \
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# CXX="g++ -arch i386 -arch x86_64 -arch ppc -arch ppc64" \
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# CPP="gcc -E" CXXCPP="g++ -E"
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#
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# Detect this situation and set the macro AA_APPLE_UNIVERSAL_BUILD at the
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# beginning of config.h and set APPLE_UNIVERSAL_BUILD accordingly.
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AC_DEFUN_ONCE([gl_MULTIARCH],
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[
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dnl Code similar to autoconf-2.63 AC_C_BIGENDIAN.
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gl_cv_c_multiarch=no
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AC_COMPILE_IFELSE(
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[AC_LANG_SOURCE(
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[[#ifndef __APPLE_CC__
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not a universal capable compiler
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#endif
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typedef int dummy;
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]])],
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[
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dnl Check for potential -arch flags. It is not universal unless
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dnl there are at least two -arch flags with different values.
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arch=
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prev=
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for word in ${CC} ${CFLAGS} ${CPPFLAGS} ${LDFLAGS}; do
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if test -n "$prev"; then
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case $word in
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i?86 | x86_64 | ppc | ppc64)
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if test -z "$arch" || test "$arch" = "$word"; then
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arch="$word"
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else
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gl_cv_c_multiarch=yes
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fi
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;;
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esac
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prev=
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else
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if test "x$word" = "x-arch"; then
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prev=arch
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fi
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fi
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done
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])
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if test $gl_cv_c_multiarch = yes; then
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AC_DEFINE([AA_APPLE_UNIVERSAL_BUILD], [1],
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[Define if the compiler is building for multiple architectures of Apple platforms at once.])
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APPLE_UNIVERSAL_BUILD=1
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else
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APPLE_UNIVERSAL_BUILD=0
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fi
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AC_SUBST([APPLE_UNIVERSAL_BUILD])
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])
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