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bug #871: fix compilation on ARM/Neon regarding __has_builtin usage (backport)

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Gael Guennebaud
2014-09-01 10:58:07 +02:00
parent 05fb735d1d
commit 5daebe0a27
2 changed files with 19 additions and 3 deletions
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7
Eigen/src/Core/util/Macros.h
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@@ -96,6 +96,13 @@
#define EIGEN_DEFAULT_DENSE_INDEX_TYPE std::ptrdiff_t
#endif
// Cross compiler wrapper around LLVM's __has_builtin
#ifdef __has_builtin
# define EIGEN_HAS_BUILTIN(x) __has_builtin(x)
#else
# define EIGEN_HAS_BUILTIN(x) 0
#endif
/** Allows to disable some optimizations which might affect the accuracy of the result.
* Such optimization are enabled by default, and set EIGEN_FAST_MATH to 0 to disable them.
* They currently include: