Hello everybody, I am building diffutils 3.12 in a clean build environment for Arch Linux. That fails when building with link time optimization is enabled:
In function 'diag',
inlined from 'compareseq' at ../lib/diffseq.h:515:7:
../lib/diffseq.h:426:36: error: 'fxbest' may be used uninitialized
[-Werror=maybe-uninitialized]
426 | part->ymid = fxybest - fxbest;
| ^
../lib/diffseq.h: In function 'compareseq':
../lib/diffseq.h:387:32: note: 'fxbest' was declared here
387 | OFFSET fxybest = -1, fxbest;
| ^
In function 'diag',
inlined from 'compareseq' at ../lib/diffseq.h:515:7:
../lib/diffseq.h:433:36: error: 'bxbest' may be used uninitialized
[-Werror=maybe-uninitialized]
433 | part->ymid = bxybest - bxbest;
| ^
../lib/diffseq.h: In function 'compareseq':
../lib/diffseq.h:405:40: note: 'bxbest' was declared here
405 | OFFSET bxybest = OFFSET_MAX, bxbest;
| ^
sdiff.c: In function 'edit':
sdiff.c:957:11: error: 'cmd1' may be used uninitialized
[-Werror=maybe-uninitialized]
957 | switch (cmd1)
| ^
sdiff.c:861:11: note: 'cmd1' was declared here
861 | int cmd1;
| ^
lto1: all warnings being treated as errors
The build succeed as soon as I disable link time optimization. Would be nice
to have a fix for this to reenable lto. Let me know if I can provide more
information on this. Thanks!
--
main(a){char*c=/* Schoene Gruesse */"B?IJj;MEH"
"CX:;",b;for(a/* Best regards my address: */=0;b=c[a++];)
putchar(b-1/(/* Chris cc -ox -xc - && ./x */b/42*2-3)*42);}
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