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From: Jonathan Wakely <>
Cc: Jason Merrill <>
Subject: [committed] [gcc-12] libstdc++: avoid bogus -Wrestrict [PR105651]
Date: Wed, 21 Jun 2023 13:22:07 +0100	[thread overview]
Message-ID: <> (raw)

I've pushed Jason's patch from to the
gcc-12 branch, because Jakub's fix on gcc-13 isn't possible to backport.

Tested x86_64-linux, pushed to gcc-12.

-- >8 --

	PR tree-optimization/105651


	* include/bits/basic_string.tcc (_M_replace): Add an assert
	to avoid -Wrestrict false positive.
 libstdc++-v3/include/bits/basic_string.tcc | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/libstdc++-v3/include/bits/basic_string.tcc b/libstdc++-v3/include/bits/basic_string.tcc
index 0696b96604c..48fa28e6466 100644
--- a/libstdc++-v3/include/bits/basic_string.tcc
+++ b/libstdc++-v3/include/bits/basic_string.tcc
 		      const size_type __nleft = (__p + __len1) - __s;
 		      this->_S_move(__p, __s, __nleft);
+		      // Tell the middle-end that the copy can't overlap
+		      // (PR105651).
+		      if (__len2 < __nleft)
+			__builtin_unreachable();
 		      this->_S_copy(__p + __nleft, __p + __len2,
 				    __len2 - __nleft);

                 reply	other threads:[~2023-06-21 12:22 UTC|newest]

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