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+dnl @synopsis AX_CPP_VARARG_MACRO_GCC
+dnl
+dnl Test if the preprocessor understands GNU GCC-style vararg macros.
+dnl If it does, defines HAVE_CPP_VARARG_MACRO_GCC to 1.
+dnl
+dnl @version
+dnl @author James Yonan <jim@yonan.net>, Matthias Andree <matthias.andree@web.de>
+AC_DEFUN([AX_CPP_VARARG_MACRO_GCC], [dnl
+ AS_VAR_PUSHDEF([VAR], [ax_cv_cpp_vararg_macro_gcc])dnl
+ AC_CACHE_CHECK(
+ [for GNU GCC vararg macro support],
+ [VAR],
+ [AC_COMPILE_IFELSE(
+ [AC_LANG_PROGRAM(
+ [[
+#define macro(a, b...) func(a, b)
+int func(int a, int b, int c);
+ ]],
+ [[
+int i = macro(1, 2, 3);
+ ]]
+ )],
+ [VAR=yes],
+ [VAR=no]
+ )]
+ )dnl
+
+ AS_VAR_IF(
+ [VAR],
+ [yes],
+ [AC_DEFINE(
+ [HAVE_CPP_VARARG_MACRO_GCC],
+ [1],
+ [Define to 1 if your compiler supports GNU GCC-style variadic macros]
+ )]
+ )dnl
+ AS_VAR_POPDEF([VAR])dnl
+])
+
+dnl @synopsis AX_CPP_VARARG_MACRO_ISO
+dnl
+dnl Test if the preprocessor understands ISO C 1999 vararg macros.
+dnl If it does, defines HAVE_CPP_VARARG_MACRO_ISO to 1.
+dnl
+dnl @version
+dnl @author James Yonan <jim@yonan.net>, Matthias Andree <matthias.andree@web.de>
+AC_DEFUN([AX_CPP_VARARG_MACRO_ISO], [dnl
+ AS_VAR_PUSHDEF([VAR],[ax_cv_cpp_vararg_macro_iso])dnl
+ AC_CACHE_CHECK(
+ [for ISO C 1999 vararg macro support],
+ [VAR],
+ [AC_COMPILE_IFELSE(
+ [AC_LANG_PROGRAM(
+ [[
+#define macro(a, ...) func(a, __VA_ARGS__)
+int func(int a, int b, int c);
+ ]],
+ [[
+int i = macro(1, 2, 3);
+ ]]
+ )],
+ [VAR=yes],
+ [VAR=no]
+ )]
+ )dnl
+
+ AS_VAR_IF(
+ [VAR],
+ [yes],
+ [AC_DEFINE(
+ [HAVE_CPP_VARARG_MACRO_ISO],
+ [1],
+ [Define to 1 if your compiler supports ISO C99 variadic macros]
+ )]
+ )dnl
+ AS_VAR_POPDEF([VAR])dnl
+])