Public bug reported:
Compiling a C++ program that only included standard headers should never
define or declare anything outside of namespace std.
However, try to compile this:
#include <cmath>
int y0;
>g++ junk.cc
junk.cc:3:5: error: ‘int y0’ redeclared as different kind of symbol
int y0;
^
In file included from /usr/include/features.h:374:0,
from
/usr/include/x86_64-linux-gnu/c++/4.8/bits/os_defines.h:39,
from
/usr/include/x86_64-linux-gnu/c++/4.8/bits/c++config.h:426,
from /usr/include/c++/4.8/cmath:41,
from junk.cc:1:
/usr/include/x86_64-linux-gnu/bits/mathcalls.h:240:1: error: previous
declaration of ‘double y0(double)’
__MATHCALL (y0,, (_Mdouble_));
^
The file in question defines a lot (which is supposedly on purpose for the C
language with GNU extension),
which is shouldn't do that when compiling a C++ program.
** Affects: glibc (Ubuntu)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/1578857
Title:
bits/mathcalls.h causes declarations in global namespace in C++
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