diff options
Diffstat (limited to 'm4/stdarg.m4')
-rw-r--r-- | m4/stdarg.m4 | 40 |
1 files changed, 40 insertions, 0 deletions
diff --git a/m4/stdarg.m4 b/m4/stdarg.m4 new file mode 100644 index 0000000..e8e680a --- /dev/null +++ b/m4/stdarg.m4 @@ -0,0 +1,40 @@ +# stdarg.m4 serial 1 +dnl Copyright (C) 2006 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 From Bruno Haible. +dnl Provide a working va_copy in combination with <stdarg.h>. + +AC_DEFUN([gl_STDARG_H], +[ + AC_MSG_CHECKING([for va_copy]) + AC_CACHE_VAL([gl_cv_func_va_copy], [ + AC_TRY_COMPILE([#include <stdarg.h>], [ +#ifndef va_copy +void (*func) (va_list, va_list) = va_copy; +#endif +], + [gl_cv_func_va_copy=yes], [gl_cv_func_va_copy=no])]) + AC_MSG_RESULT([$gl_cv_func_va_copy]) + if test $gl_cv_func_va_copy = no; then + # Provide a substitute, either __va_copy or as a simple assignment. + AC_CACHE_VAL([gl_cv_func___va_copy], [ + AC_TRY_COMPILE([#include <stdarg.h>], [ +#ifndef __va_copy +error, bail out +#endif +], + [gl_cv_func___va_copy=yes], [gl_cv_func___va_copy=no])]) + if test $gl_cv_func___va_copy = yes; then + AC_DEFINE([va_copy], [__va_copy], + [Define as a macro for copying va_list variables.]) + else + AH_VERBATIM([gl_VA_COPY], [/* A replacement for va_copy, if needed. */ +#define gl_va_copy(a,b) ((a) = (b))]) + AC_DEFINE([va_copy], [gl_va_copy], + [Define as a macro for copying va_list variables.]) + fi + fi +]) |