| # multiarch.m4 serial 7 |
| dnl Copyright (C) 2008-2013 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. |
| 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 $word in |
| i?86 | x86_64 | ppc | ppc64) |
| if test -z "$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]) |
| ]) |
