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__STRICT_ANSI__ problems in math.h
- From: "Sweval, Jevin A" <jevin dot a dot sweval at delphi dot com>
- To: <newlib at sourceware dot org>
- Date: Thu, 5 Jul 2007 10:12:07 -0400
- Subject: __STRICT_ANSI__ problems in math.h
Currently math.h checks to make sure that __STRICT_ANSI__ is not defined before prototyping functions like fmax. This is presumably to ensure that non-C89 functions are not defined if -ansi is passed to gcc. However, __STRICT_ANSI__ is still defined when passing -std=c99 to gcc. This causes C99 functions like fmax to not have any prototypes. It seems that checking for __STRICT_ANSI__ is not enough. Perhaps a solution is to check for __STRICT_ANSI__ and a __STDC_VERSION__ >= 199901L? This isn't a problem for me with GCC 3.4.4 on Cygwin because GCC has a builtin fmax, but with GCC 3.3.3 Cygwin, the compiled code fails to work correctly because of the lack of prototypes. Below is an example of what I am talking about. I'm guessing that there are more instances of this type of C89 checking, but I didn't have to worry about them for the scope of my problem.
-Jevin Sweval
original math.h
================================================
#endif /* ! defined (_REENT_ONLY) */
#if !defined(__STRICT_ANSI__) || defined(__cplusplus)
/* ISO C99 types and macros. */
#ifndef FLT_EVAL_METHOD
================================================
correct(?) checking:
================================================
#endif /* ! defined (_REENT_ONLY) */
#if !defined(__STRICT_ANSI__) || defined(__cplusplus) || __STDC_VERSION__ >= 199901L
/* ISO C99 types and macros. */
#ifndef FLT_EVAL_METHOD
================================================
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