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[Bug libstdc++/14608] <iostream.h> nukes isfinite macro from <math.h>
- From: "bkoz at gcc dot gnu dot org" <gcc-bugzilla at gcc dot gnu dot org>
- To: gcc-bugs at gcc dot gnu dot org
- Date: 27 Jan 2009 20:49:49 -0000
- Subject: [Bug libstdc++/14608] <iostream.h> nukes isfinite macro from <math.h>
- References: <bug-14608-37@http.gcc.gnu.org/bugzilla/>
- Reply-to: gcc-bugzilla at gcc dot gnu dot org
------- Comment #9 from bkoz at gcc dot gnu dot org 2009-01-27 20:49 -------
Looks to me like the flipside of libstdc++/7439. More broadly speaking, C99
macros vs. C++98/0x. The current status on this issue is:
For 4.1/4.2/4.3/trunk, C99 macros should be visible with
1) -std=gnu99/c99 in "C" code (platform-specific if this is guarded: linux
is)
2) with _GLIBCXX_USE_C99_MATH defined for c++98/0x, macros are undefined and
templates scoped in namespace std:: are visible. The macro
_GLIBCXX_USE_C99_FP_MACROS_DYNAMIC can be defined to suppress this, and define
the macros.
This seems like standards-conformant behaviour is possible with the right
combination of defines. Sadly, this is not documented, and clearly need to be.
With documentation to explain this, I think this bug can be closed.
I am adding the keyword documentation to this bug and will take care of it in
the next documentation sweep.
--
bkoz at gcc dot gnu dot org changed:
What |Removed |Added
----------------------------------------------------------------------------
Keywords| |documentation
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=14608