I had to make the following patch to build glibc 2.36 (release/2.36/master, 4f4d7a13edfd2fdc57c9d76e1fd6d017fb47550c) on x86_32 (i686). Other arches (x86_64, aarch64, riscv64) did not require this change). --- a/locale/weight.h +++ b/locale/weight.h @@ -144,7 +144,7 @@ is impossible for the same reason as described above. */ DIAG_PUSH_NEEDS_COMMENT; - DIAG_IGNORE_Os_NEEDS_COMMENT (7, "-Wmaybe-uninitialized"); + DIAG_IGNORE_NEEDS_COMMENT (7, "-Wmaybe-uninitialized"); offset += usrc[cnt] - cp[cnt]; DIAG_POP_NEEDS_COMMENT; } --- a/locale/weightwc.h +++ b/locale/weightwc.h @@ -102,7 +102,7 @@ might be used uninitialized. This is impossible for the same reason as described above. */ DIAG_PUSH_NEEDS_COMMENT; - DIAG_IGNORE_Os_NEEDS_COMMENT (7, "-Wmaybe-uninitialized"); + DIAG_IGNORE_NEEDS_COMMENT (7, "-Wmaybe-uninitialized"); for (cnt = 0; cnt < nhere - 1 && cnt < len; ++cnt) if (cp[cnt] != usrc[cnt]) break; --- a/string/strcoll_l.c +++ b/string/strcoll_l.c @@ -180,7 +180,7 @@ ensures that seq->save_idx was saved to first and contains a valid value. */ DIAG_PUSH_NEEDS_COMMENT; - DIAG_IGNORE_Os_NEEDS_COMMENT (5, "-Wmaybe-uninitialized"); + DIAG_IGNORE_NEEDS_COMMENT (5, "-Wmaybe-uninitialized"); len = weights[idx++]; DIAG_POP_NEEDS_COMMENT; /* Skip over indices of previous levels. */ Comments near patched code write about -Os, but I was building without -Os Full command line and error (errors were similar for other patched cases): DEBUG: gcc -fuse-ld=bfd -fomit-frame-pointer strcoll_l.c -c -std=gnu11 -fgnu89-inline -funwind-tables -fasynchronous-unwind-tables -O3 -Wstrict-aliasing=2 -pipe -Wformat -Werror=format-security -D_FORTIFY_SOURCE=2 -fstack-protector-strong --param=ssp-buffer-size=4 -march=i686 -mtune=generic -msse -mfpmath=sse -fasynchronous-unwind-tables -mstackrealign -march=i686 -msse -mfpmath=sse -mtune=generic -Wp,-D_GLIBCXX_ASSERTIONS -DNDEBUG=1 -fstack-clash-protection -O3 -gdwarf-4 -Wstrict-aliasing=2 -pipe -Wformat -Werror=format-security -D_FORTIFY_SOURCE=2 -fPIC -fstack-protector-strong --param=ssp-buffer-size=4 -march=i686 -mtune=generic -msse -mfpmath=sse -fasynchronous-unwind-tables -mstackrealign -O3 -Wno-error=stringop-overflow -fno-strict-aliasing -Wformat -fno-lto -mno-tls-direct-seg-refs -Wno-error -Wall -Wwrite-strings -Wundef -Werror -fmerge-all-constants -frounding-math -fstack-protector-strong -fno-common -Wstrict-prototypes -Wold-style-definition -fmath-errno -fomit-frame-pointer -fomit-frame-pointer -fpie -ftls-model=initial-exec -U_FORTIFY_SOURCE -I../include -I/builddir/build/BUILD/glibc-4f4d7a13edfd2fdc57c9d76e1fd6d017fb47550c/build-i686-linux/string -I/builddir/build/BUILD/glibc-4f4d7a13edfd2fdc57c9d76e1fd6d017fb47550c/build-i686-linux -I../sysdeps/unix/sysv/linux/i386/i686 -I../sysdeps/i386/i686/nptl -I../sysdeps/unix/sysv/linux/i386 -I../sysdeps/unix/sysv/linux/x86/include -I../sysdeps/unix/sysv/linux/x86 -I../sysdeps/x86/nptl -I../sysdeps/i386/nptl -I../sysdeps/unix/sysv/linux/include -I../sysdeps/unix/sysv/linux -I../sysdeps/nptl -I../sysdeps/pthread -I../sysdeps/gnu -I../sysdeps/unix/inet -I../sysdeps/unix/sysv -I../sysdeps/unix/i386 -I../sysdeps/unix -I../sysdeps/posix -I../sysdeps/i386/i686/fpu/multiarch -I../sysdeps/i386/i686/fpu -I../sysdeps/i386/i686/multiarch -I../sysdeps/i386/i686 -I../sysdeps/i386/fpu -I../sysdeps/x86/fpu -I../sysdeps/i386 -I../sysdeps/x86/include -I../sysdeps/x86 -I../sysdeps/wordsize-32 -I../sysdeps/ieee754/float128 -I../sysdeps/ieee754/ldbl-96/include -I../sysdeps/ieee754/ldbl-96 -I../sysdeps/ieee754/dbl-64 -I../sysdeps/ieee754/flt-32 -I../sysdeps/ieee754 -I../sysdeps/generic -I.. -I../libio -I. -nostdinc -isystem /usr/lib/gcc/i686-rosa-linux-gnu/11.2.0/include -isystem /usr/include -D_LIBC_REENTRANT -include /builddir/build/BUILD/glibc-4f4d7a13edfd2fdc57c9d76e1fd6d017fb47550c/build-i686-linux/libc-modules.h -DMODULE_NAME=libc -include ../include/libc-symbols.h -DPIC -DTOP_NAMESPACE=glibc -o /builddir/build/BUILD/glibc-4f4d7a13edfd2fdc57c9d76e1fd6d017fb47550c/build-i686-linux/string/strcoll_l.o -MD -MP -MF /builddir/build/BUILD/glibc-4f4d7a13edfd2fdc57c9d76e1fd6d017fb47550c/build-i686-linux/string/strcoll_l.o.dt -MT /builddir/build/BUILD/glibc-4f4d7a13edfd2fdc57c9d76e1fd6d017fb47550c/build-i686-linux/string/strcoll_l.o DEBUG: In file included from strcoll_l.c:42: DEBUG: strcoll_l.c: In function '__strcoll_l': DEBUG: ../locale/weight.h:148:33: error: 'seq2.back_us' may be used uninitialized in this function [-Werror=maybe-uninitialized] DEBUG: 148 | offset += usrc[cnt] - cp[cnt]; DEBUG: | ~~~~^~~~~
Right, which gcc version did you use it? I am checking with GCC 11 and I have not see any issue so far.
(In reply to Adhemerval Zanella from comment #1) > Right, which gcc version did you use it? I am checking with GCC 11 and I > have not see any issue so far. It is gcc 11: $ gcc --version gcc (GCC) 11.2.0 20210728 (ROSA) I have provided full gcc cmdline with flags above, do not have any ideas else where the difference can be... If it will help, here is a chroot in which this problem can be reproduced: https://mirror.rosalinux.ru/rosa/rosa2021.1/iso/ROSA.FRESH.12/rootfs/rootfs-std-rosa2021.1_x86_64_2022-11-02.tar.xz Or an installable livecd: https://mirror.rosalinux.ru/rosa/rosa2021.1/iso/ROSA.FRESH.12/server/ To reproduce the problem, run: sudo mkdir chroot cd chroot sudo tar -xf /path/to/rootfs-std-rosa2021.1_x86_64_2022-11-02.tar.xz sudo systemd-nspawn -D . (or sudo chroot .) # if running in VM, not chroot/container, start from here dnf install basesystem-build /usr/bin/mbd git-core abf git clone https://abf.io/import/glibc.git -b rosa2023.1 cd glibc mbd glibc.spec dnf install *.rpm (install build dependencies of glibc) Comment out the patch described above: -Patch10: glibc-fix-ix86-build.patch +#Patch10: glibc-fix-ix86-build.patch Run the build: abf rpmbuild (just press enter when it asks questions about config) gcc sources are here: https://abf.io/import/gcc/tree/rosa2021.1 glibc with that problem: https://abf.io/import/glibc/tree/rosa2023.1