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[libc++] Work around gcc/Power9 bug in include/thread

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This fixes PR39696, which breaks the libcxx build with gcc (I tested
7.5.0) on Power9.  This fix was suggested at

https://bugs.llvm.org/show_bug.cgi?id=39696#c38

but never applied.  It just reverts 0583d9ea8d5e, which reverses
components of the original fix in 3bf63cf3b366, which is correct.

Fixes https://llvm.org/PR39696

Reviewed By: ldionne

Differential Revision: https://reviews.llvm.org/D81438
This commit is contained in:
Joel E. Denny 2020-06-10 12:40:43 -04:00
parent 4b1b09fcc0
commit d9a42ec98a
1 changed files with 2 additions and 2 deletions
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4
libcxx/include/thread
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@ -365,9 +365,9 @@ sleep_for(const chrono::duration<_Rep, _Period>& __d)
{
#if defined(_LIBCPP_COMPILER_GCC) && (__powerpc__ || __POWERPC__)
// GCC's long double const folding is incomplete for IBM128 long doubles.
_LIBCPP_CONSTEXPR duration<long double> _Max = nanoseconds::max();
#else
_LIBCPP_CONSTEXPR duration<long double> _Max = duration<long double>(ULLONG_MAX/1000000000ULL) ;
#else
_LIBCPP_CONSTEXPR duration<long double> _Max = nanoseconds::max();
#endif
nanoseconds __ns;
if (__d < _Max)