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Annotation of embedaddon/libiconv/srcm4/multiarch.m4, revision 1.1.1.1

1.1       misho       1: # multiarch.m4 serial 5
                      2: dnl Copyright (C) 2008, 2009 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 MacOS 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 the macro AA_APPLE_UNIVERSAL_BUILD at the
                     20: # beginning of config.h and set APPLE_UNIVERSAL_BUILD accordingly.
                     21: 
                     22: AC_DEFUN_ONCE([gl_MULTIARCH],
                     23: [
                     24:   dnl Code similar to autoconf-2.63 AC_C_BIGENDIAN.
                     25:   gl_cv_c_multiarch=no
                     26:   AC_COMPILE_IFELSE(
                     27:     [AC_LANG_SOURCE(
                     28:       [[#ifndef __APPLE_CC__
                     29:          not a universal capable compiler
                     30:         #endif
                     31:         typedef int dummy;
                     32:       ]])],
                     33:     [
                     34:      dnl Check for potential -arch flags.  It is not universal unless
                     35:      dnl there are at least two -arch flags with different values.
                     36:      arch=
                     37:      prev=
                     38:      for word in ${CC} ${CFLAGS} ${CPPFLAGS} ${LDFLAGS}; do
                     39:        if test -n "$prev"; then
                     40:          case $word in
                     41:            i?86 | x86_64 | ppc | ppc64)
                     42:              if test -z "$arch" || test "$arch" = "$word"; then
                     43:                arch="$word"
                     44:              else
                     45:                gl_cv_c_multiarch=yes
                     46:              fi
                     47:              ;;
                     48:          esac
                     49:          prev=
                     50:        else
                     51:          if test "x$word" = "x-arch"; then
                     52:            prev=arch
                     53:          fi
                     54:        fi
                     55:      done
                     56:     ])
                     57:   if test $gl_cv_c_multiarch = yes; then
                     58:     AC_DEFINE([AA_APPLE_UNIVERSAL_BUILD], [1],
                     59:       [Define if the compiler is building for multiple architectures of Apple platforms at once.])
                     60:     APPLE_UNIVERSAL_BUILD=1
                     61:   else
                     62:     APPLE_UNIVERSAL_BUILD=0
                     63:   fi
                     64:   AC_SUBST([APPLE_UNIVERSAL_BUILD])
                     65: ])