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generated...
2007-08-05

(C) 2007 guidod
Download the M4 Source.

ac_check_typedef

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Synopsis
AC_CHECK_TYPEDEF_(TYPEDEF, HEADER [, ACTION-IF-FOUND [, ACTION-IF-NOT-FOUND ]])
, 
Version

2006-10-13

Author

Guido U. Draheim <guidod@gmx.de>

License

GPLWithACException
This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation. As a special exception, the respective Autoconf Macro's copyright owner gives unlimited permission to copy, distribute and modify the configure scripts that are the output of Autoconf when processing the Macro. You need not follow the terms of the GNU General Public License when using or distributing such scripts

Category

cryp.to ac-archive's C Support (released)

Documentation

check if the given typedef-name is recognized as a type. The trick is to use a sizeof(TYPEDEF) and see if the compiler is happy with that.

this can be thought of as a mixture of AC_CHECK_TYPE(TYPEDEF,DEFAULT) and AC_CHECK_LIB(LIBRARY,FUNCTION,ACTION-IF-FOUND,ACTION-IF-NOT-FOUND)

a convenience macro AC_CHECK_TYPEDEF_ is provided that will not emit any message to the user - it just executes one of the actions.

M4 Source Code
AC_DEFUN([AC_CHECK_TYPEDEF_],
[dnl
ac_lib_var=`echo $1['_']$2 | sed 'y%./+-%__p_%'`
AC_CACHE_VAL(ac_cv_lib_$ac_lib_var,
[ eval "ac_cv_type_$ac_lib_var='not-found'"
  ac_cv_check_typedef_header=`echo ifelse([$2], , stddef.h, $2)`
  AC_TRY_COMPILE( [#include &lt;$ac_cv_check_typedef_header&gt;],
	[int x = sizeof($1); x = x;],
        eval "ac_cv_type_$ac_lib_var=yes" ,
        eval "ac_cv_type_$ac_lib_var=no" )
  if test `eval echo '$ac_cv_type_'$ac_lib_var` = "no" ; then
     ifelse([$4], , :, $4)
  else
     ifelse([$3], , :, $3)
  fi
])])

dnl AC_CHECK_TYPEDEF(TYPEDEF, HEADER [, ACTION-IF-FOUND,
dnl    [, ACTION-IF-NOT-FOUND ]])
AC_DEFUN([AC_CHECK_TYPEDEF],
[dnl
 AC_MSG_CHECKING([for $1 in $2])
 AC_CHECK_TYPEDEF_($1,$2,AC_MSG_RESULT(yes),AC_MSG_RESULT(no))dnl
])