glibc

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Adhemerval Zanella d9b965fa56 Fix isinf/isnan declaration conflict with C++11 GLIBC declares isinf and isnan as expected by Unix98 and for C99 programs these functions are hidden by the generics inf and isnan macros. However C++11 defines isinf and isnan with the same semantics as C99 but requires that they are functions not macros (C++11 26.8 [c.math] paragraph 10). This then results in a conflict for perfectly valid C++11 programs: -- using std::isinf; using std::isnan; double d1 = isinf(1.0); double d2 = isnan(1.0); d.cc:3:12: error: ‘constexpr bool std::isinf(double)’ conflicts with a previous declaration using std::isinf; [...] /usr/include/bits/mathcalls.h:201:1: note: previous declaration ‘int isinf(double)’ __MATHDECL_1 (int,isinf,, (_Mdouble_ __value)) __attribute__ ((__const__)); [...] -- This patch fixes the prototypes by leaving the obsolete functions defined for C++98 code (since they do not conflict with any standard function in C++98), however preventing them on C++11. No issues found in libstdc++ tests and check on x86_64 and i686 with glibc testsuite. Patch from Jonathan Wakely <jwakely.gcc@gmail.com>. [BZ #19439] * math/bits/mathcalls.h [!__cplusplus \|\| __cplusplus < 201103L] (isinf): Do not declare prototype. [!__cplusplus \|\| __cplusplus < 201103L] (isnan): Likewise.		10 years ago
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cmathcalls.h	Update copyright dates with scripts/update-copyrights.	10 years ago
math-finite.h	Update copyright dates with scripts/update-copyrights.	10 years ago
mathcalls.h	Fix isinf/isnan declaration conflict with C++11	10 years ago