FreeBSD/Linux Kernel Cross Reference
sys/contrib/openzfs/config/intlmacosx.m4

     # intlmacosx.m4 serial 6 (gettext-0.20)
     dnl Copyright (C) 2004-2014, 2016, 2019 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.
     dnl
     dnl This file can be used in projects which are not available under
     dnl the GNU General Public License or the GNU Library General Public
     dnl License but which still want to provide support for the GNU gettext
    dnl functionality.
    dnl Please note that the actual code of the GNU gettext library is covered
    dnl by the GNU Library General Public License, and the rest of the GNU
    dnl gettext package is covered by the GNU General Public License.
    dnl They are *not* in the public domain.
    
    dnl Checks for special options needed on Mac OS X.
    dnl Defines INTL_MACOSX_LIBS.
    AC_DEFUN([gt_INTL_MACOSX],
    [
      dnl Check for API introduced in Mac OS X 10.4.
      AC_CACHE_CHECK([for CFPreferencesCopyAppValue],
        [gt_cv_func_CFPreferencesCopyAppValue],
        [gt_save_LIBS="$LIBS"
         LIBS="$LIBS -Wl,-framework -Wl,CoreFoundation"
         AC_LINK_IFELSE(
           [AC_LANG_PROGRAM(
              [[#include <CoreFoundation/CFPreferences.h>]],
              [[CFPreferencesCopyAppValue(NULL, NULL)]])],
           [gt_cv_func_CFPreferencesCopyAppValue=yes],
           [gt_cv_func_CFPreferencesCopyAppValue=no])
         LIBS="$gt_save_LIBS"])
      if test $gt_cv_func_CFPreferencesCopyAppValue = yes; then
        AC_DEFINE([HAVE_CFPREFERENCESCOPYAPPVALUE], [1],
          [Define to 1 if you have the Mac OS X function CFPreferencesCopyAppValue in the CoreFoundation framework.])
      fi
      dnl Check for API introduced in Mac OS X 10.5.
      AC_CACHE_CHECK([for CFLocaleCopyCurrent], [gt_cv_func_CFLocaleCopyCurrent],
        [gt_save_LIBS="$LIBS"
         LIBS="$LIBS -Wl,-framework -Wl,CoreFoundation"
         AC_LINK_IFELSE(
           [AC_LANG_PROGRAM(
              [[#include <CoreFoundation/CFLocale.h>]],
              [[CFLocaleCopyCurrent();]])],
           [gt_cv_func_CFLocaleCopyCurrent=yes],
           [gt_cv_func_CFLocaleCopyCurrent=no])
         LIBS="$gt_save_LIBS"])
      if test $gt_cv_func_CFLocaleCopyCurrent = yes; then
        AC_DEFINE([HAVE_CFLOCALECOPYCURRENT], [1],
          [Define to 1 if you have the Mac OS X function CFLocaleCopyCurrent in the CoreFoundation framework.])
      fi
      AC_CACHE_CHECK([for CFLocaleCopyPreferredLanguages], [gt_cv_func_CFLocaleCopyPreferredLanguages],
        [gt_save_LIBS="$LIBS"
         LIBS="$LIBS -Wl,-framework -Wl,CoreFoundation"
         AC_LINK_IFELSE(
           [AC_LANG_PROGRAM(
              [[#include <CoreFoundation/CFLocale.h>]],
              [[CFLocaleCopyPreferredLanguages();]])],
           [gt_cv_func_CFLocaleCopyPreferredLanguages=yes],
           [gt_cv_func_CFLocaleCopyPreferredLanguages=no])
         LIBS="$gt_save_LIBS"])
      if test $gt_cv_func_CFLocaleCopyPreferredLanguages = yes; then
        AC_DEFINE([HAVE_CFLOCALECOPYPREFERREDLANGUAGES], [1],
          [Define to 1 if you have the Mac OS X function CFLocaleCopyPreferredLanguages in the CoreFoundation framework.])
      fi
      INTL_MACOSX_LIBS=
      if test $gt_cv_func_CFPreferencesCopyAppValue = yes \
         || test $gt_cv_func_CFLocaleCopyCurrent = yes \
         || test $gt_cv_func_CFLocaleCopyPreferredLanguages = yes; then
        INTL_MACOSX_LIBS="-Wl,-framework -Wl,CoreFoundation"
      fi
      AC_SUBST([INTL_MACOSX_LIBS])
    ])

Cache object: e372c273a3b857ca64c32d43e06434ba