This never showed up as an issue because it's an internal header and implicitly guarded by bits/simd.h.
OK for trunk? Any reason to backport?
--------------------- 8< ------------------
Signed-off-by: Matthias Kretz <m.kr...@gsi.de>
libstdc++-v3/ChangeLog:
* include/experimental/bits/numeric_traits.h: Add include guard.
---
libstdc++-v3/include/experimental/bits/numeric_traits.h | 4 ++++
1 file changed, 4 insertions(+)
diff --git a/libstdc++-v3/include/experimental/bits/numeric_traits.h b/
libstdc++-v3/include/experimental/bits/numeric_traits.h
index b195de7c3db..8717f684d96 100644
--- a/libstdc++-v3/include/experimental/bits/numeric_traits.h
+++ b/libstdc++-v3/include/experimental/bits/numeric_traits.h
@@ -22,6 +22,9 @@
// see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
// <http://www.gnu.org/licenses/>.
+#ifndef _GLIBCXX_EXPERIMENTAL_BITS_NUMERIC_TRAITS_H
+#define _GLIBCXX_EXPERIMENTAL_BITS_NUMERIC_TRAITS_H
+
#include <type_traits>
namespace std {
@@ -565,3 +568,4 @@ struct __has_iec559_behavior<__signaling_NaN, long
double>
#endif // __FINITE_MATH_ONLY__
} // namespace std
+#endif // _GLIBCXX_EXPERIMENTAL_BITS_NUMERIC_TRAITS_H
--
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Dr. Matthias Kretz https://mattkretz.github.io
GSI Helmholtz Centre for Heavy Ion Research https://gsi.de
stdₓ::simd
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