# AC_LANG_STDCALL_FUNC_LINK_TRY(FUNCTION, SIGNATURE)

# -------------------------------

# Produce a source which links correctly iff the FUNCTION exists.

AC_DEFUN([AC_LANG_STDCALL_FUNC_LINK_TRY],

[_AC_LANG_DISPATCH([$0], _AC_LANG, $@)])

# AC_CHECK_STDCALL_FUNC(FUNCTION, SIGNATURE, [ACTION-IF-FOUND], [ACTION-IF-NOT-FOUND])

# -----------------------------------------------------------------

AC_DEFUN([AC_CHECK_STDCALL_FUNC],

[AS_VAR_PUSHDEF([ac_var], [ac_cv_func_$1])dnl

AC_CACHE_CHECK([for $1], ac_var,

[AC_LINK_IFELSE([AC_LANG_STDCALL_FUNC_LINK_TRY([$1],[$2])],

                [AS_VAR_SET(ac_var, yes)],

                [AS_VAR_SET(ac_var, no)])])

AS_IF([test AS_VAR_GET(ac_var) = yes], [$3], [$4])dnl

AS_VAR_POPDEF([ac_var])dnl

])# AC_CHECK_FUNC

# AC_LANG_STDCALL_FUNC_LINK_TRY(C)(FUNCTION, SIGNATURE)

# ----------------------------------

# Don't include <ctype.h> because on OSF/1 3.0 it includes

# <sys/types.h> which includes <sys/select.h> which contains a

# prototype for select.  Similarly for bzero.

m4_define([AC_LANG_STDCALL_FUNC_LINK_TRY(C)],

[AC_LANG_PROGRAM(

[/* System header to define __stub macros and hopefully few prototypes,

    which can conflict with char __stdcall $1 ( $2 ) below.  */

#include <assert.h>

/* Override any gcc2 internal prototype to avoid an error.  */

#ifdef __cplusplus

extern "C"

#endif

/* We use char because int might match the return type of a gcc2

   builtin and then its argument prototype would still apply.  */

char __stdcall $1 ( $2 );

char (*f) ( $2 );

],

[/* The GNU C library defines this for functions which it implements

    to always fail with ENOSYS.  Some functions are actually named

    something starting with __ and the normal name is an alias.  */

#if defined (__stub_$1) || defined (__stub___$1)

choke me

#else

f = $1;

#endif

])])

# AC_LANG_STDCALL_FUNC_LINK_TRY(C++)(FUNCTION)

# ------------------------------------

m4_copy([AC_LANG_STDCALL_FUNC_LINK_TRY(C)], [AC_LANG_STDCALL_FUNC_LINK_TRY(C++)])