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math: Import isinf and others to global namespace 

Starting from C++11, several math functions, like isinf, moved into the std
namespace. Since cmath undefines those functions before redefining them inside
the namespace, and glibc 2.23 defines the C variants as macros, the C variants
in global namespace are not accessible any longer.

v2: Move the fix outside of Nouveau, as suggested by Jose Fonseca, since anyone
    might need it when GCC switches to C++14 by default with GCC 6.0.

v3:
*   Put the code directly inside c99_math.h rather than creating a new header
    file, as asked by Jose Fonseca;
*   Guard the code behind glibc version checks, as only glibc > =2.23 defines
    isinf & co. as functions, as suggested by Jose Fonseca.

Signed-off-by: Pierre Moreau <pierre.morrow@free.fr>
Signed-off-by: Jose Fonseca <jfonseca@vmware.com>
This commit is contained in:
Pierre Moreau 2016-04-14 20:43:00 +02:00 committed by Jose Fonseca
parent d3c98c73dc
commit 649704f1f7
1 changed files with 23 additions and 0 deletions
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23
include/c99_math.h
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@ -185,4 +185,27 @@ fpclassify(double x)
#endif
/* Since C++11, the following functions are part of the std namespace. Their C
* counteparts should still exist in the global namespace, however cmath
* undefines those functions, which in glibc 2.23, are defined as macros rather
* than functions as in glibc 2.22.
*/
#if __cplusplus >= 201103L && (__GLIBC__ > 2 || (__GLIBC__ == 2 && __GLIBC_MINOR__ >= 23))
#include <cmath>
using std::fpclassify;
using std::isfinite;
using std::isinf;
using std::isnan;
using std::isnormal;
using std::signbit;
using std::isgreater;
using std::isgreaterequal;
using std::isless;
using std::islessequal;
using std::islessgreater;
using std::isunordered;
#endif
#endif /* #define _C99_MATH_H_ */