[libcxx-commits] [PATCH] D81438: [libc++] Work around gcc/Power9 bug in `include/thread`

Joel E. Denny via Phabricator via libcxx-commits libcxx-commits at lists.llvm.org
Mon Jun 8 16:39:51 PDT 2020

jdenny created this revision.
jdenny added reviewers: mclow.lists, ken-cunningham-webuse, ikitayama, EricWF.
Herald added a project: libc++.
Herald added a reviewer: libc++.

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


but never applied.

Fixes https://llvm.org/PR39696

  rG LLVM Github Monorepo



Index: libcxx/include/thread
--- libcxx/include/thread
+++ libcxx/include/thread
@@ -365,9 +365,9 @@
 #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();
         _LIBCPP_CONSTEXPR duration<long double> _Max = duration<long double>(ULLONG_MAX/1000000000ULL) ;
+        _LIBCPP_CONSTEXPR duration<long double> _Max = nanoseconds::max();
         nanoseconds __ns;
         if (__d < _Max)

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