Mercurial > hg > octave-jordi > gnulib-hg
view m4/va-args.m4 @ 15426:60c6b6da0198
ffs: avoid undefined behavior
* lib/ffs.c (ffs): Provide fallback for non-32-bit int.
* tests/test-ffs.c (naive, main): Avoid signed shifts.
Reported by Bruno Haible.
Signed-off-by: Eric Blake <eblake@redhat.com>
author | Eric Blake <eblake@redhat.com> |
---|---|
date | Fri, 15 Jul 2011 14:26:43 -0600 |
parents | 97fc9a21a8fb |
children | 8250f2777afc |
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# va-args.m4 serial 1 dnl Copyright (C) 2009-2011 Free Software Foundation, Inc. dnl This file is free software; the Free Software Foundation dnl gives unlimited permission to copy and/or distribute it, dnl with or without modifications, as long as this notice is preserved. dnl Test for variadic macro support. dnl Define HAVE_VA_ARGS if macros can use __VA_ARGS__. AC_DEFUN([gl_VA_ARGS], [ AC_CACHE_CHECK([whether the preprocessor allows variadic macros], [gl_cv_c_va_args], [AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[ #include <stdio.h> #define a(func, arg, ...) func (arg, __VA_ARGS__) #define b(...) a (__VA_ARGS__) ]], [[b (printf, "%s", "test");]])], [gl_cv_c_va_args=yes], [gl_cv_c_va_args=no]) ]) if test $gl_cv_c_va_args = yes; then AC_DEFINE([HAVE_VA_ARGS], [1], [Define to 1 if the preprocessor supports variadic macros and __VA_ARGS__.]) fi ])