[Mingw-notify] [ mingw-Bugs-615664 ] cmath and ansi

[<no...@so...>]

Bugs item #615664, was opened at 2002-09-28 08:00
You can respond by visiting: 
https://sourceforge.net/tracker/?func=detail&atid=102435&aid=615664&group_id=2435

Category: gcc
Group: None
Status: Open
Resolution: None
Priority: 5
Submitted By: Xavier Trochu (xtrochu)
Assigned to: Danny Smith (dannysmith)
Summary: cmath and ansi

Initial Comment:
There is a bug that occur when compiling with the -ansi
and when including <cmath> header.

a simple test :

test.cpp
#include <cmath>

$ gcc -c test.cpp
In file included from base_math_test.cpp:1:
c:/tools/mingw/include/c++/3.2/cmath: In function
`float std::acos(float)':
c:/tools/mingw/include/c++/3.2/cmath:99: `::acosf'
undeclared (first use here)
...

The problem is that _mingw.h define 
_GLIBCPP_HAVE_ACOSF even when compiling with -ansi
but math.h does not declare the acosf() function if
__STRICT_ANSI__ is not defined.



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>Comment By: Danny Smith (dannysmith)
Date: 2002-09-28 12:01

Message:
Logged In: YES 
user_id=11494

What is version of mingw-runtime (in _mingw.h).  I 
though this bug was fixed by a change in math.h
 that protected C99 math with:

#if (defined (__STDC_VERSION__) && 
__STDC_VERSION__ >= 199901L) \
	|| !defined  __STRICT_ANSI__  || defined 
__GLIBCPP__

so that C99 math was available to  __GLIBCPP__

Actually, in hindsight,  I think this is the wrong fix.   the 
guard should be something more strict like:
 defined  __GLIBCPP_USE_C99

In even stricter sense, C++98 shouldn't be exposing 
C99 functions which are not part of C++98 std.

If  you are using mingw runtime earlier than  2.2 , please 
update and tell me if problem persists.

Danny


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Comment By: Xavier Trochu (xtrochu)
Date: 2002-09-28 08:02

Message:
Logged In: YES 
user_id=1927

please note that this is new and the software that produced
the bug compiled fine with gcc 3.1

I forgot to mention that it was for gcc 3.2


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You can respond by visiting: 
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