Matthew Backes mbackes@symas.com writes:
But really, it seems reasonable to borrow a few features from a standard from 1999. Is anyone actively maintaining OpenLDAP on platforms with no C99ish compiler available?
If you support both the C99 varient and the old gcc varient, I expect you cover everything anyone might care about. People with old platforms can use gcc instead.
Here is the Autoconf probe that I use to detect variadic macro support.
dnl vamacros.m4 -- Check for support for variadic macros. dnl $Id: vamacros.m4 6544 2003-12-26 03:23:31Z rra $ dnl dnl This file defines two macros for probing for compiler support for variadic dnl macros. Provided are INN_C_C99_VAMACROS, which checks for support for the dnl C99 variadic macro syntax, namely: dnl dnl #define macro(...) fprintf(stderr, __VA_ARGS__) dnl dnl and INN_C_GNU_VAMACROS, which checks for support for the older GNU dnl variadic macro syntax, namely: dnl dnl #define macro(args...) fprintf(stderr, args) dnl dnl They set HAVE_C99_VAMACROS or HAVE_GNU_VAMACROS as appropriate.
AC_DEFUN([INN_C_C99_VAMACROS], [AC_CACHE_CHECK([for C99 variadic macros], [inn_cv_c_c99_vamacros], [AC_TRY_COMPILE( [#include <stdio.h> #define error(...) fprintf(stderr, __VA_ARGS__)], [error("foo"); error("foo %d", 0); return 0;], [inn_cv_c_c99_vamacros=yes], [inn_cv_c_c99_vamacros=no])]) if test $inn_cv_c_c99_vamacros = yes ; then AC_DEFINE([HAVE_C99_VAMACROS], 1, [Define if the compiler supports C99 variadic macros.]) fi])
AC_DEFUN([INN_C_GNU_VAMACROS], [AC_CACHE_CHECK([for GNU-style variadic macros], [inn_cv_c_gnu_vamacros], [AC_TRY_COMPILE( [#include <stdio.h> #define error(args...) fprintf(stderr, args)], [error("foo"); error("foo %d", 0); return 0;], [inn_cv_c_gnu_vamacros=yes], [inn_cv_c_gnu_vamacros=no])]) if test $inn_cv_c_gnu_vamacros = yes ; then AC_DEFINE([HAVE_GNU_VAMACROS], 1, [Define if the compiler supports GNU-style variadic macros.]) fi])