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++)])
+