| 1 | # multiarch.m4 serial 7 |
| 2 | dnl Copyright (C) 2008-2012 Free Software Foundation, Inc. |
| 3 | dnl This file is free software; the Free Software Foundation |
| 4 | dnl gives unlimited permission to copy and/or distribute it, |
| 5 | dnl 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 | # |
| 9 | # On Mac OS X 10.5 and later systems, the user can create libraries and |
| 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 | # |
| 19 | # Detect this situation and set APPLE_UNIVERSAL_BUILD accordingly. |
| 20 | |
| 21 | AC_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 |
| 57 | APPLE_UNIVERSAL_BUILD=1 |
| 58 | else |
| 59 | APPLE_UNIVERSAL_BUILD=0 |
| 60 | fi |
| 61 | AC_SUBST([APPLE_UNIVERSAL_BUILD]) |
| 62 | ]) |