Hi folks, I'm testing out the latest release previews from platform-testers in Gentoo and came across the following.
diffutils' tests seem to fail (specifically the 'color' test) when built with
UBSAN (-fsanitize=undefined):
```
[...]
+ mkfifo fifo
+ printf %1000000s-a
+ printf %1000000s-b
+ + diff --color=always ---presume-output-tty a bhead
-c 10
util.c:205:3: runtime error: execution reached an unreachable program point
#0 0x558fa0c7ee3c in xsigismember
/var/tmp/portage/sys-apps/diffutils-3.8_p20221230/work/diffutils-3.8.43-2d50/src/util.c:205
#1 0x558fa0c7f4e5 in install_signal_handlers
/var/tmp/portage/sys-apps/diffutils-3.8_p20221230/work/diffutils-3.8.43-2d50/src/util.c:372
#2 0x558fa0c80f05 in check_color_output
/var/tmp/portage/sys-apps/diffutils-3.8_p20221230/work/diffutils-3.8.43-2d50/src/util.c:822
#3 0x558fa0c81976 in begin_output
/var/tmp/portage/sys-apps/diffutils-3.8_p20221230/work/diffutils-3.8.43-2d50/src/util.c:1017
#4 0x558fa0c7c63d in print_normal_hunk
/var/tmp/portage/sys-apps/diffutils-3.8_p20221230/work/diffutils-3.8.43-2d50/src/normal.c:49
#5 0x558fa0c82cd1 in print_script
/var/tmp/portage/sys-apps/diffutils-3.8_p20221230/work/diffutils-3.8.43-2d50/src/util.c:1303
#6 0x558fa0c7c5e5 in print_normal_script
/var/tmp/portage/sys-apps/diffutils-3.8_p20221230/work/diffutils-3.8.43-2d50/src/normal.c:31
#7 0x558fa0c640cc in diff_2_files
/var/tmp/portage/sys-apps/diffutils-3.8_p20221230/work/diffutils-3.8.43-2d50/src/analyze.c:665
#8 0x558fa0c6f28c in compare_files
/var/tmp/portage/sys-apps/diffutils-3.8_p20221230/work/diffutils-3.8.43-2d50/src/diff.c:1488
#9 0x558fa0c69e11 in main
/var/tmp/portage/sys-apps/diffutils-3.8_p20221230/work/diffutils-3.8.43-2d50/src/diff.c:851
#10 0x7fb6ab79664f in __libc_start_call_main
../sysdeps/nptl/libc_start_call_main.h:58
#11 0x7fb6ab796708 in __libc_start_main_impl ../csu/libc-start.c:381
#12 0x558fa0c5a144 in _start ../sysdeps/x86_64/start.S:115
+ test 1 = 141
+ fail=1
+ Exit 1
+ set +e
+ exit 1
+ exit 1
+ remove_tmp_
+ __st=1
+ cleanup_
+ :
+ test = yes
+ cd
/var/tmp/portage/sys-apps/diffutils-3.8_p20221230/work/diffutils-3.8.43-2d50/tests
+ chmod -R u+rwx
/var/tmp/portage/sys-apps/diffutils-3.8_p20221230/work/diffutils-3.8.43-2d50/tests/gt-colors.1cSV
+ rm -rf
/var/tmp/portage/sys-apps/diffutils-3.8_p20221230/work/diffutils-3.8.43-2d50/tests/gt-colors.1cSV
+ exit 1
FAIL colors (exit status: 1)
============================================================================
Testsuite summary for GNU diffutils 3.8.43-2d50
============================================================================
# TOTAL: 23
# PASS: 21
# SKIP: 0
# XFAIL: 1
# FAIL: 1
# XPASS: 0
# ERROR: 0
============================================================================
See tests/test-suite.log
Please report to bug-diffutils@gnu.org
============================================================================
```
This is with GCC 12.2.1_p20221224.
I've made the full log available at
https://dev.gentoo.org/~sam/bugs/diffutils/ubsan-color-test/build.log
and https://dev.gentoo.org/~sam/bugs/diffutils/ubsan-color-test/test-suite.log.
Let me know if more information is required.
Best,
sam
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