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When building powerpc64+glibc-2.32 we see the following error: [ALL ] In file included from ../sysdeps/powerpc/powerpc32/power4/multiarch/wordcopy-ppc32.c:26, [ALL ] from ../sysdeps/powerpc/powerpc64/multiarch/wordcopy-ppc64.c:18: [ALL ] ../string/wordcopy.c: In function '_wordcopy_fwd_aligned': [ERROR] ../string/wordcopy.c:98:26: error: 'a1' may be used uninitialized in this function [-Werror=maybe-uninitialized] [ALL ] 98 | ((op_t *) dstp)[0] = a1; [ALL ] | ~~~~~~~~~~~~~~~~~~~^~~~ [ALL ] In file included from ../sysdeps/powerpc/powerpc64/power4/../../powerpc32/power4/memcopy.h:38, [ALL ] from ../sysdeps/powerpc/powerpc64/power4/memcopy.h:1, [ALL ] from ../string/wordcopy.c:23, [ALL ] from ../sysdeps/powerpc/powerpc32/power4/multiarch/wordcopy-ppc32.c:26, [ALL ] from ../sysdeps/powerpc/powerpc64/multiarch/wordcopy-ppc64.c:18: [ALL ] ../string/wordcopy.c: In function '_wordcopy_fwd_dest_aligned': [ERROR] ../sysdeps/generic/memcopy.h:72:61: error: 'a3' may be used uninitialized in this function [-Werror=maybe-uninitialized] [ALL ] 72 | #define MERGE(w0, sh_1, w1, sh_2) (((w0) << (sh_1)) | ((w1) >> (sh_2))) [ALL ] | ^~ This seems to only trigger for powerpc64. Other architectures build cleanly. For now avoid specifying -Werror for powerpc64+glibc-2.32. Signed-off-by: Chris Packham <judge.packham@gmail.com>