[PATCH] libstdc++: follow std in numeric_limits<bool>::traps

[Alexandre Oliva]

There's a comment from 2002 suggesting that
numeric_limits<bool>::traps was in a DR, but C++ standards including
11, 17 and 23 explicitly set it to false.  I suppose whatever DR that
comment referred to must have long been resolved in favor of what's in
these much newer releases of the standard.  So align it with the
standards, and drop the comment.

Regstrapped on x86_64-linux-gnu.  Ok to install?  Not a regression
AFAICT; perhaps for stage1?


for  libstdc++-v3/ChangeLog

	* include/std/limits (numeric_limits<bool>::traps): Set to
	false.
---
 libstdc++-v3/include/std/limits |    5 +----
 1 file changed, 1 insertion(+), 4 deletions(-)

diff --git a/libstdc++-v3/include/std/limits b/libstdc++-v3/include/std/limits
index f0ba2851a0a2e..c160503e0a826 100644
--- a/libstdc++-v3/include/std/limits
+++ b/libstdc++-v3/include/std/limits
@@ -446,10 +446,7 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
       static _GLIBCXX_USE_CONSTEXPR bool is_bounded = true;
       static _GLIBCXX_USE_CONSTEXPR bool is_modulo = false;
 
-      // It is not clear what it means for a boolean type to trap.
-      // This is a DR on the LWG issue list.  Here, I use integer
-      // promotion semantics.
-      static _GLIBCXX_USE_CONSTEXPR bool traps = __glibcxx_integral_traps;
+      static _GLIBCXX_USE_CONSTEXPR bool traps = false;
       static _GLIBCXX_USE_CONSTEXPR bool tinyness_before = false;
       static _GLIBCXX_USE_CONSTEXPR float_round_style round_style
        = round_toward_zero;

-- 
Alexandre Oliva, happy hacker            https://blog.lx.oliva.nom.br/
Free Software Activist     FSFLA co-founder     GNU Toolchain Engineer
More tolerance and less prejudice are key for inclusion and diversity.
Excluding neuro-others for not behaving ""normal"" is *not* inclusive!