On Linux/x86_64,

7a8f98b48104ccf10c6dceccc51b70de69288eaa is the first bad commit
commit 7a8f98b48104ccf10c6dceccc51b70de69288eaa
Author: Chung-Lin Tang <[email protected]>
Date:   Tue Jun 30 09:15:22 2026 +0000

    OpenMP: support for uses_allocators clause

caused

FAIL: libgomp.fortran/dep-uses-allocators.f90   -O   at line 12 (test for 
warnings, line 11)
FAIL: libgomp.fortran/uses_allocators-1.f90   -O  (test for excess errors)
FAIL: libgomp.fortran/uses_allocators-7.f90   -O   scan-tree-dump-times 
original "#pragma omp target .*uses_allocators\\(memspace\\(1\\), traits\\(\\) 
: my4\\) uses_allocators\\(memspace\\(\\), traits\\(t2\\) : my3\\) 
uses_allocators\\(memspace\\(\\), traits\\(\\) : my2\\) 
uses_allocators\\(memspace\\(3\\), traits\\(t\\) : my\\)" 1

with GCC configured with

../../gcc/configure 
--prefix=/export/users3/haochenj/src/gcc-bisect/master/master/r17-2003/usr 
--enable-clocale=gnu --with-system-zlib --with-demangler-in-ld 
--with-fpmath=sse --enable-languages=c,c++,fortran --enable-cet --without-isl 
--enable-libmpx x86_64-linux --disable-bootstrap

To reproduce:

$ cd {build_dir}/x86_64-linux/libgomp/testsuite && make check 
RUNTESTFLAGS="c++.exp=libgomp.c-c++-common/uses_allocators-2.c 
--target_board='unix{-m32}'"
$ cd {build_dir}/x86_64-linux/libgomp/testsuite && make check 
RUNTESTFLAGS="c++.exp=libgomp.c-c++-common/uses_allocators-2.c 
--target_board='unix{-m32\ -march=cascadelake}'"
$ cd {build_dir}/x86_64-linux/libgomp/testsuite && make check 
RUNTESTFLAGS="c++.exp=libgomp.c-c++-common/uses_allocators-2.c 
--target_board='unix{-m64}'"
$ cd {build_dir}/x86_64-linux/libgomp/testsuite && make check 
RUNTESTFLAGS="c++.exp=libgomp.c-c++-common/uses_allocators-2.c 
--target_board='unix{-m64\ -march=cascadelake}'"
$ cd {build_dir}/x86_64-linux/libgomp/testsuite && make check 
RUNTESTFLAGS="c++.exp=libgomp.c-c++-common/uses_allocators-9.c 
--target_board='unix{-m32}'"
$ cd {build_dir}/x86_64-linux/libgomp/testsuite && make check 
RUNTESTFLAGS="c++.exp=libgomp.c-c++-common/uses_allocators-9.c 
--target_board='unix{-m32\ -march=cascadelake}'"
$ cd {build_dir}/x86_64-linux/libgomp/testsuite && make check 
RUNTESTFLAGS="c++.exp=libgomp.c-c++-common/uses_allocators-9.c 
--target_board='unix{-m64}'"
$ cd {build_dir}/x86_64-linux/libgomp/testsuite && make check 
RUNTESTFLAGS="c++.exp=libgomp.c-c++-common/uses_allocators-9.c 
--target_board='unix{-m64\ -march=cascadelake}'"
$ cd {build_dir}/x86_64-linux/libgomp/testsuite && make check 
RUNTESTFLAGS="fortran.exp=libgomp.fortran/dep-uses-allocators.f90 
--target_board='unix{-m32}'"
$ cd {build_dir}/x86_64-linux/libgomp/testsuite && make check 
RUNTESTFLAGS="fortran.exp=libgomp.fortran/dep-uses-allocators.f90 
--target_board='unix{-m32\ -march=cascadelake}'"
$ cd {build_dir}/x86_64-linux/libgomp/testsuite && make check 
RUNTESTFLAGS="fortran.exp=libgomp.fortran/dep-uses-allocators.f90 
--target_board='unix{-m64}'"
$ cd {build_dir}/x86_64-linux/libgomp/testsuite && make check 
RUNTESTFLAGS="fortran.exp=libgomp.fortran/dep-uses-allocators.f90 
--target_board='unix{-m64\ -march=cascadelake}'"
$ cd {build_dir}/x86_64-linux/libgomp/testsuite && make check 
RUNTESTFLAGS="fortran.exp=libgomp.fortran/uses_allocators-1.f90 
--target_board='unix{-m32}'"
$ cd {build_dir}/x86_64-linux/libgomp/testsuite && make check 
RUNTESTFLAGS="fortran.exp=libgomp.fortran/uses_allocators-1.f90 
--target_board='unix{-m32\ -march=cascadelake}'"
$ cd {build_dir}/x86_64-linux/libgomp/testsuite && make check 
RUNTESTFLAGS="fortran.exp=libgomp.fortran/uses_allocators-7.f90 
--target_board='unix{-m32}'"
$ cd {build_dir}/x86_64-linux/libgomp/testsuite && make check 
RUNTESTFLAGS="fortran.exp=libgomp.fortran/uses_allocators-7.f90 
--target_board='unix{-m32\ -march=cascadelake}'"
$ cd {build_dir}/x86_64-linux/libgomp/testsuite && make check 
RUNTESTFLAGS="fortran.exp=libgomp.fortran/uses_allocators-7.f90 
--target_board='unix{-m64}'"
$ cd {build_dir}/x86_64-linux/libgomp/testsuite && make check 
RUNTESTFLAGS="fortran.exp=libgomp.fortran/uses_allocators-7.f90 
--target_board='unix{-m64\ -march=cascadelake}'"

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(If you met problems with cascadelake related, disabling AVX512F in command 
line might save that.)
(However, please make sure that there is no potential problems with AVX512.)

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