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-rw-r--r--Eigen/src/Core/util/Macros.h6
1 files changed, 2 insertions, 4 deletions
diff --git a/Eigen/src/Core/util/Macros.h b/Eigen/src/Core/util/Macros.h
index 4eeb8211c..76a14b472 100644
--- a/Eigen/src/Core/util/Macros.h
+++ b/Eigen/src/Core/util/Macros.h
@@ -416,12 +416,10 @@
#endif
// Does the compiler support C99 math?
+// Let's be conservative and enable the default C++11 implementation only if we are sure it exists
#if (__cplusplus >= 201103L) && (EIGEN_COMP_GNUC_STRICT || EIGEN_COMP_CLANG || EIGEN_COMP_MSVC || EIGEN_COMP_ICC) \
&& (EIGEN_ARCH_i386_OR_x86_64) && (EIGEN_OS_GNULINUX || EIGEN_OS_WIN_STRICT || EIGEN_OS_MAC) || \
- (EIGEN_COMP_GNUC_STRICT || \
- (EIGEN_COMP_ICC && EIGEN_COMP_GNUC) || \
- (EIGEN_COMP_CLANG) || \
- (EIGEN_COMP_MSVC >= 1800))
+ (EIGEN_COMP_GNUC_STRICT || (EIGEN_COMP_ICC && EIGEN_COMP_GNUC) || (EIGEN_COMP_CLANG) || (EIGEN_COMP_MSVC >= 1800))
#define EIGEN_HAS_C99_MATH 1
#endif