kc3-lang/gnulib/m4/multiarch.m4

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• Hash : 32a72f45
  Author :
  Date : 2023-01-01T01:14:21
  

  maint: run 'make update-copyright'
  

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• m4/multiarch.m4

• # multiarch.m4 serial 9
  dnl Copyright (C) 2008-2023 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.
    AC_CACHE_CHECK([whether the compiler produces multi-arch binaries],
      [gl_cv_c_multiarch],
      [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 $word in
                i?86 | x86_64 | ppc | ppc64 | arm | arm64)
                  if test -z "$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])
  ])
  

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