[gcc(refs/vendors/redhat/heads/gcc-8-branch)] Daily bump.

[Jakub Jelinek]

https://gcc.gnu.org/g:1e3e1d99198e7b6a42239caa6dd0535918cb8db3

commit 1e3e1d99198e7b6a42239caa6dd0535918cb8db3
Author: GCC Administrator <gccadmin@gcc.gnu.org>
Date:   Tue Nov 17 00:17:43 2020 +0000

    Daily bump.

Diff:
---
 gcc/DATESTAMP          |  2 +-
 libstdc++-v3/ChangeLog | 22 ++++++++++++++++++++++
 2 files changed, 23 insertions(+), 1 deletion(-)

diff --git a/gcc/DATESTAMP b/gcc/DATESTAMP
index 69155b9380a..0ad54ab67bd 100644
--- a/gcc/DATESTAMP
+++ b/gcc/DATESTAMP
@@ -1 +1 @@
-20201116
+20201117
diff --git a/libstdc++-v3/ChangeLog b/libstdc++-v3/ChangeLog
index abfc75d2b5e..2cb3a625d5b 100644
--- a/libstdc++-v3/ChangeLog
+++ b/libstdc++-v3/ChangeLog
@@ -1,3 +1,25 @@
+2020-11-16  Jonathan Wakely  <jwakely@redhat.com>
+
+	Backported from master:
+	2020-08-28  Jonathan Wakely  <jwakely@redhat.com>
+
+	PR libstdc++/92978
+	* include/std/numeric (__abs_integral): Replace with ...
+	(__detail::__absu): New function template that returns an
+	unsigned type, guaranteeing it can represent the most
+	negative signed value.
+	(__detail::__gcd, __detail::__lcm): Require arguments to
+	be unsigned and therefore already non-negative.
+	(gcd, lcm): Convert arguments to absolute value as unsigned
+	type before calling __detail::__gcd or __detail::__lcm.
+	* include/experimental/numeric (gcd, lcm): Likewise.
+	* testsuite/26_numerics/gcd/gcd_neg.cc: Adjust expected
+	errors.
+	* testsuite/26_numerics/lcm/lcm_neg.cc: Likewise.
+	* testsuite/26_numerics/gcd/92978.cc: New test.
+	* testsuite/26_numerics/lcm/92978.cc: New test.
+	* testsuite/experimental/numeric/92978.cc: New test.
+
 2020-11-09  Jonathan Wakely  <jwakely@redhat.com>
 
 	Backported from master: