diff options
Diffstat (limited to 'contrib/libarchive/build/autoconf/check_stdcall_func.m4')
-rw-r--r-- | contrib/libarchive/build/autoconf/check_stdcall_func.m4 | 51 |
1 files changed, 51 insertions, 0 deletions
diff --git a/contrib/libarchive/build/autoconf/check_stdcall_func.m4 b/contrib/libarchive/build/autoconf/check_stdcall_func.m4 new file mode 100644 index 0000000..926b046 --- /dev/null +++ b/contrib/libarchive/build/autoconf/check_stdcall_func.m4 @@ -0,0 +1,51 @@ +# 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++)]) + |