1# =========================================================================== 2# https://www.gnu.org/software/autoconf-archive/ax_check_define.html 3# =========================================================================== 4# 5# SYNOPSIS 6# 7# AC_CHECK_DEFINE([symbol], [ACTION-IF-FOUND], [ACTION-IF-NOT]) 8# AX_CHECK_DEFINE([includes],[symbol], [ACTION-IF-FOUND], [ACTION-IF-NOT]) 9# 10# DESCRIPTION 11# 12# Complements AC_CHECK_FUNC but it does not check for a function but for a 13# define to exist. Consider a usage like: 14# 15# AC_CHECK_DEFINE(__STRICT_ANSI__, CFLAGS="$CFLAGS -D_XOPEN_SOURCE=500") 16# 17# LICENSE 18# 19# Copyright (c) 2008 Guido U. Draheim <guidod@gmx.de> 20# 21# Copying and distribution of this file, with or without modification, are 22# permitted in any medium without royalty provided the copyright notice 23# and this notice are preserved. This file is offered as-is, without any 24# warranty. 25 26#serial 11 27 28AU_ALIAS([AC_CHECK_DEFINED], [AC_CHECK_DEFINE]) 29AC_DEFUN([AC_CHECK_DEFINE],[ 30AS_VAR_PUSHDEF([ac_var],[ac_cv_defined_$1])dnl 31AC_CACHE_CHECK([for $1 defined], ac_var, 32AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[]], [[ 33 #ifdef $1 34 int ok; 35 (void)ok; 36 #else 37 choke me 38 #endif 39]])],[AS_VAR_SET(ac_var, yes)],[AS_VAR_SET(ac_var, no)])) 40AS_IF([test AS_VAR_GET(ac_var) != "no"], [$2], [$3])dnl 41AS_VAR_POPDEF([ac_var])dnl 42]) 43 44AU_ALIAS([AX_CHECK_DEFINED], [AX_CHECK_DEFINE]) 45AC_DEFUN([AX_CHECK_DEFINE],[ 46AS_VAR_PUSHDEF([ac_var],[ac_cv_defined_$2_$1])dnl 47AC_CACHE_CHECK([for $2 defined in $1], ac_var, 48AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[#include <$1>]], [[ 49 #ifdef $2 50 int ok; 51 (void)ok; 52 #else 53 choke me 54 #endif 55]])],[AS_VAR_SET(ac_var, yes)],[AS_VAR_SET(ac_var, no)])) 56AS_IF([test AS_VAR_GET(ac_var) != "no"], [$3], [$4])dnl 57AS_VAR_POPDEF([ac_var])dnl 58]) 59 60AC_DEFUN([AX_CHECK_FUNC], 61[AS_VAR_PUSHDEF([ac_var], [ac_cv_func_$2])dnl 62AC_CACHE_CHECK([for $2], ac_var, 63dnl AC_LANG_FUNC_LINK_TRY 64[AC_LINK_IFELSE([AC_LANG_PROGRAM([$1 65 #undef $2 66 char $2 ();],[ 67 char (*f) () = $2; 68 return f != $2; ])], 69 [AS_VAR_SET(ac_var, yes)], 70 [AS_VAR_SET(ac_var, no)])]) 71AS_IF([test AS_VAR_GET(ac_var) = yes], [$3], [$4])dnl 72AS_VAR_POPDEF([ac_var])dnl 73])# AC_CHECK_FUNC 74