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* [Bug libstdc++/48406] New: <algorithm> #undefs isfinite() from math.h in C++0x mode
@ 2011-04-02 1:12 jyasskin at gcc dot gnu.org
2011-04-02 5:52 ` [Bug libstdc++/48406] " jyasskin at gcc dot gnu.org
2011-04-02 10:46 ` paolo.carlini at oracle dot com
0 siblings, 2 replies; 3+ messages in thread
From: jyasskin at gcc dot gnu.org @ 2011-04-02 1:12 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=48406
Summary: <algorithm> #undefs isfinite() from math.h in C++0x
mode
Product: gcc
Version: 4.7.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: libstdc++
AssignedTo: unassigned@gcc.gnu.org
ReportedBy: jyasskin@gcc.gnu.org
$ cat test.cc
#include <math.h>
#include <algorithm>
bool foo(double d) {
return isfinite(d);
}
$ ~/opensource/gcc/git/install/bin/g++ -c test.cc
$ ~/opensource/gcc/git/install/bin/g++ -c test.cc -std=gnu++0x
test.cc: In function ‘bool foo(double)’:
test.cc:5:20: error: ‘isfinite’ was not declared in this scope
test.cc:5:20: note: suggested alternative:
.../include/c++/4.7.0/cmath:528:21: note: ‘std::isfinite’
$
This is a regression since gcc-4.4:
$ g++-4.4 -c test.cc -std=gnu++0x
$
It happens because <stl_algo.h> includes <random> in C++0x mode only, and
<random> includes <cmath>, which #undefs all the C99 math functions that
<math.h> defined, without 'using' the std functions back into the global
namespace.
As far as I can tell, [depr.c.headers] says that <math.h> puts the <cmath>
names into the global namespace, and it doesn't allow a later include of
<cmath> to take them back out. [depr.c.headers] also allows <cmath> to
unconditionally put its declarations and definitions into the global namespace,
which is what I'd propose as a fix.
^ permalink raw reply [flat|nested] 3+ messages in thread
* [Bug libstdc++/48406] <algorithm> #undefs isfinite() from math.h in C++0x mode
2011-04-02 1:12 [Bug libstdc++/48406] New: <algorithm> #undefs isfinite() from math.h in C++0x mode jyasskin at gcc dot gnu.org
@ 2011-04-02 5:52 ` jyasskin at gcc dot gnu.org
2011-04-02 10:46 ` paolo.carlini at oracle dot com
1 sibling, 0 replies; 3+ messages in thread
From: jyasskin at gcc dot gnu.org @ 2011-04-02 5:52 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=48406
--- Comment #1 from Jeffrey Yasskin <jyasskin at gcc dot gnu.org> 2011-04-02 05:52:12 UTC ---
FWIW, the path from algorithm->cmath appears to have been introduced in
gcc-4.5.
^ permalink raw reply [flat|nested] 3+ messages in thread
* [Bug libstdc++/48406] <algorithm> #undefs isfinite() from math.h in C++0x mode
2011-04-02 1:12 [Bug libstdc++/48406] New: <algorithm> #undefs isfinite() from math.h in C++0x mode jyasskin at gcc dot gnu.org
2011-04-02 5:52 ` [Bug libstdc++/48406] " jyasskin at gcc dot gnu.org
@ 2011-04-02 10:46 ` paolo.carlini at oracle dot com
1 sibling, 0 replies; 3+ messages in thread
From: paolo.carlini at oracle dot com @ 2011-04-02 10:46 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=48406
Paolo Carlini <paolo.carlini at oracle dot com> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |RESOLVED
Resolution| |DUPLICATE
--- Comment #2 from Paolo Carlini <paolo.carlini at oracle dot com> 2011-04-02 10:46:32 UTC ---
.
*** This bug has been marked as a duplicate of bug 14608 ***
^ permalink raw reply [flat|nested] 3+ messages in thread
end of thread, other threads:[~2011-04-02 10:46 UTC | newest]
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2011-04-02 1:12 [Bug libstdc++/48406] New: <algorithm> #undefs isfinite() from math.h in C++0x mode jyasskin at gcc dot gnu.org
2011-04-02 5:52 ` [Bug libstdc++/48406] " jyasskin at gcc dot gnu.org
2011-04-02 10:46 ` paolo.carlini at oracle dot com
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