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      1 # multiarch.m4 serial 9
      2 dnl Copyright (C) 2008-2022 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   AC_CACHE_CHECK([whether the compiler produces multi-arch binaries],
     25     [gl_cv_c_multiarch],
     26     [gl_cv_c_multiarch=no
     27      AC_COMPILE_IFELSE(
     28        [AC_LANG_SOURCE(
     29          [[#ifndef __APPLE_CC__
     30             not a universal capable compiler
     31            #endif
     32            typedef int dummy;
     33          ]])],
     34        [
     35         dnl Check for potential -arch flags.  It is not universal unless
     36         dnl there are at least two -arch flags with different values.
     37         arch=
     38         prev=
     39         for word in ${CC} ${CFLAGS} ${CPPFLAGS} ${LDFLAGS}; do
     40           if test -n "$prev"; then
     41             case $word in
     42               i?86 | x86_64 | ppc | ppc64 | arm | arm64)
     43                 if test -z "$arch" || test "$arch" = "$word"; then
     44                   arch="$word"
     45                 else
     46                   gl_cv_c_multiarch=yes
     47                 fi
     48                 ;;
     49             esac
     50             prev=
     51           else
     52             if test "x$word" = "x-arch"; then
     53               prev=arch
     54             fi
     55           fi
     56         done
     57        ])
     58     ])
     59   if test $gl_cv_c_multiarch = yes; then
     60     APPLE_UNIVERSAL_BUILD=1
     61   else
     62     APPLE_UNIVERSAL_BUILD=0
     63   fi
     64   AC_SUBST([APPLE_UNIVERSAL_BUILD])
     65 ])
     66