Commit: See in git+ssh://linaroci@gcc.gnu.org/git/gcc.git
gcc patch https://patchwork.sourceware.org/patch/138220
Author: Yuao Ma <c8ef@outlook.com>
Date:   Wed Jul 1 22:36:33 2026 +0800

    [PATCH] libstdc++: implement LWG3662 basic_string::append/assign(NTBS, pos, n) suboptimal
    
    This patch implements LWG3662 for both ABIs of std::string.
    
    libstdc++-v3/ChangeLog:
... 7 lines of the commit log omitted.
... applied on top of baseline commit:
21ed8a7be17 build: Simplify in-tree-gld version checks

* tcwg_gcc_build
** master-arm
*** Failure
*** https://gitlab.com/LinaroLtd/tcwg/ci/interesting-commits/-/raw/master/gcc/sha1/87de63ac6a2305dffcd968eba48b2c0d6ae19901/tcwg_gcc_build/master-arm/details.txt
*** http://54.172.246.49:9090/jobs/tcwg_gcc_build--master-arm-precommit/builds/11958/archive/artifacts/

Latest data: https://gitlab.com/LinaroLtd/tcwg/ci/interesting-commits/-/raw/master/gcc/sha1/87de63ac6a2305dffcd968eba48b2c0d6ae19901/jira/yaml