m4/check_stdcall_func.m4

   1 # AC_LANG_STDCALL_FUNC_LINK_TRY(FUNCTION, SIGNATURE)
   2 # -------------------------------
   3 # Produce a source which links correctly iff the FUNCTION exists.
   4 AC_DEFUN([AC_LANG_STDCALL_FUNC_LINK_TRY],
   5 [_AC_LANG_DISPATCH([$0], _AC_LANG, $@)])
   6
   7 # AC_CHECK_STDCALL_FUNC(FUNCTION, SIGNATURE, [ACTION-IF-FOUND], [ACTION-IF-NOT-FOUND])
   8 # -----------------------------------------------------------------
   9 AC_DEFUN([AC_CHECK_STDCALL_FUNC],
  10 [AS_VAR_PUSHDEF([ac_var], [ac_cv_func_$1])dnl
  11 AC_CACHE_CHECK([for $1], ac_var,
  12 [AC_LINK_IFELSE([AC_LANG_STDCALL_FUNC_LINK_TRY([$1],[$2])],
  13                 [AS_VAR_SET(ac_var, yes)],
  14                 [AS_VAR_SET(ac_var, no)])])
  15 AS_IF([test AS_VAR_GET(ac_var) = yes], [$3], [$4])dnl
  16 AS_VAR_POPDEF([ac_var])dnl
  17 ])# AC_CHECK_FUNC
  18
  19 # AC_LANG_STDCALL_FUNC_LINK_TRY(C)(FUNCTION, SIGNATURE)
  20 # ----------------------------------
  21 # Don't include <ctype.h> because on OSF/1 3.0 it includes
  22 # <sys/types.h> which includes <sys/select.h> which contains a
  23 # prototype for select.  Similarly for bzero.
  24 m4_define([AC_LANG_STDCALL_FUNC_LINK_TRY(C)],
  25 [AC_LANG_PROGRAM(
  26 [/* System header to define __stub macros and hopefully few prototypes,
  27     which can conflict with char __stdcall $1 ( $2 ) below.  */
  28 #include <assert.h>
  29 /* Override any gcc2 internal prototype to avoid an error.  */
  30 #ifdef __cplusplus
  31 extern "C"
  32 #endif
  33 /* We use char because int might match the return type of a gcc2
  34    builtin and then its argument prototype would still apply.  */
  35 char __stdcall $1 ( $2 );
  36 char (*f) ( $2 );
  37 ],
  38 [/* The GNU C library defines this for functions which it implements
  39     to always fail with ENOSYS.  Some functions are actually named
  40     something starting with __ and the normal name is an alias.  */
  41 #if defined (__stub_$1) || defined (__stub___$1)
  42 choke me
  43 #else
  44 f = $1;
  45 #endif
  46 ])])
  47
  48 # AC_LANG_STDCALL_FUNC_LINK_TRY(C++)(FUNCTION)
  49 # ------------------------------------
  50 m4_copy([AC_LANG_STDCALL_FUNC_LINK_TRY(C)], [AC_LANG_STDCALL_FUNC_LINK_TRY(C++)])
  51