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Avoid -Woverflow warning in __numeric_limits_integer 

This is the same fix as was done for std::numeric_limits in r183905.

	PR libstdc++/52119
	* include/ext/numeric_traits.h (__glibcxx_min): Avoid integer
	overflow warning with -Wpedantic -Wsystem-headers.

From-SVN: r270858
This commit is contained in:
Jonathan Wakely 2019-05-03 20:13:31 +01:00 committed by Jonathan Wakely
parent 16df703871
commit 56e5b093de
2 changed files with 8 additions and 2 deletions
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6
libstdc++-v3/ChangeLog
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@ -1,3 +1,9 @@
2019-05-03 Jonathan Wakely <jwakely@redhat.com>
PR libstdc++/52119
* include/ext/numeric_traits.h (__glibcxx_min): Avoid integer
overflow warning with -Wpedantic -Wsystem-headers.
2019-05-02 Jonathan Wakely <jwakely@redhat.com>
PR libstdc++/90314

4
libstdc++-v3/include/ext/numeric_traits.h
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@ -39,13 +39,13 @@ namespace __gnu_cxx _GLIBCXX_VISIBILITY(default)
_GLIBCXX_BEGIN_NAMESPACE_VERSION
// Compile time constants for builtin types.
// Sadly std::numeric_limits member functions cannot be used for this.
// In C++98 std::numeric_limits member functions cannot be used for this.
#define __glibcxx_signed(_Tp) ((_Tp)(-1) < 0)
#define __glibcxx_digits(_Tp) \
(sizeof(_Tp) * __CHAR_BIT__ - __glibcxx_signed(_Tp))
#define __glibcxx_min(_Tp) \
(__glibcxx_signed(_Tp) ? (_Tp)1 << __glibcxx_digits(_Tp) : (_Tp)0)
(__glibcxx_signed(_Tp) ? -__glibcxx_max(_Tp) - 1 : (_Tp)0)
#define __glibcxx_max(_Tp) \
(__glibcxx_signed(_Tp) ? \