diff options
Diffstat (limited to 'src/google/protobuf/stubs/mathlimits.h')
| -rw-r--r-- | src/google/protobuf/stubs/mathlimits.h | 17 |
1 files changed, 11 insertions, 6 deletions
diff --git a/src/google/protobuf/stubs/mathlimits.h b/src/google/protobuf/stubs/mathlimits.h index 275d9539..2391ac4c 100644 --- a/src/google/protobuf/stubs/mathlimits.h +++ b/src/google/protobuf/stubs/mathlimits.h @@ -43,18 +43,23 @@ #ifndef UTIL_MATH_MATHLIMITS_H__ #define UTIL_MATH_MATHLIMITS_H__ -// GCC 4.9 has a bug that makes it impossible to use isinf and isnan when both -// <math.h> and <cmath> get pulled into the same translation unit. -// Unfortunately it is difficult to prevent this from happening, so to work -// around the problem we use std::isinf and std::isnan from <cmath> for C++11 -// builds and otherwise use the plain isinf and isnan functions from <math.h>. // Note that for Windows we do something different because it does not support // the plain isinf and isnan. #if __cplusplus >= 201103L +// GCC 4.9 has a bug that makes isinf and isnan ambigious when both <math.h> +// and <cmath> get pulled into the same translation unit. We use the ones in +// std:: namespace explicitly for C++11 #include <cmath> +#define GOOGLE_PROTOBUF_USE_STD_CMATH +#elif _GLIBCXX_USE_C99_MATH && !_GLIBCXX_USE_C99_FP_MACROS_DYNAMIC +// libstdc++ <cmath> header undefines the global macros and put functions in +// std:: namespace even before C++11. Use the ones in std:: instead too. +#include <cmath> +#define GOOGLE_PROTOBUF_USE_STD_CMATH #else #include <math.h> #endif + #include <string.h> #include <cfloat> @@ -229,7 +234,7 @@ DECL_UNSIGNED_INT_LIMITS(unsigned long long int) // For non-Windows builds we use the std:: versions of isinf and isnan if they // are available; see the comment about <cmath> at the top of this file for the // details on why we need to do this. -#if __cplusplus >= 201103L +#ifdef GOOGLE_PROTOBUF_USE_STD_CMATH #define ISINF std::isinf #define ISNAN std::isnan #else |