https://gcc.gnu.org/bugzilla/show_bug.cgi?id=91258
Bug ID: 91258
Summary: [10 regression] g++.dg/ubsan/vla-1.C and
gcc.dg/strlenopt-70.c fail starting with r273783
Product: gcc
Version: 10.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: testsuite
Assignee: unassigned at gcc dot gnu.org
Reporter: seurer at gcc dot gnu.org
Target Milestone: ---
r273783 causes a new warning in one of the ubsan tests:
spawn -ignore SIGHUP
/home/seurer/gcc/build/gcc-test2/gcc/testsuite/g++/../../xg++
-B/home/seurer/gcc/build/gcc-test2/gcc/testsuite/g++/../../
/home/seurer/gcc/gcc-test2/gcc/testsuite/g++.dg/ubsan/vla-1.C
-fno-diagnostics-show-caret -fno-diagnostics-show-line-numbers
-fdiagnostics-color=never -nostdinc++
-I/home/seurer/gcc/build/gcc-test2/powerpc64-unknown-linux-gnu/libstdc++-v3/include/powerpc64-unknown-linux-gnu
-I/home/seurer/gcc/build/gcc-test2/powerpc64-unknown-linux-gnu/libstdc++-v3/include
-I/home/seurer/gcc/gcc-test2/libstdc++-v3/libsupc++
-I/home/seurer/gcc/gcc-test2/libstdc++-v3/include/backward
-I/home/seurer/gcc/gcc-test2/libstdc++-v3/testsuite/util -fmessage-length=0 -O2
-flto -fuse-linker-plugin -fno-fat-lto-objects -Wno-vla -fsanitize=undefined
-B/home/seurer/gcc/build/gcc-test2/powerpc64-unknown-linux-gnu/./libsanitizer/
-B/home/seurer/gcc/build/gcc-test2/powerpc64-unknown-linux-gnu/./libsanitizer/ubsan/
-L/home/seurer/gcc/build/gcc-test2/powerpc64-unknown-linux-gnu/./libsanitizer/ubsan/.libs
-L/home/seurer/gcc/build/gcc-test2/powerpc64-unknown-linux-gnu/./libstdc++-v3/src/.libs
-B/home/seurer/gcc/build/gcc-test2/powerpc64-unknown-linux-gnu/./libstdc++-v3/src/.libs
-L/home/seurer/gcc/build/gcc-test2/powerpc64-unknown-linux-gnu/./libstdc++-v3/src/.libs
-B/home/seurer/gcc/build/gcc-test2/powerpc64-unknown-linux-gnu/./libitm/
-L/home/seurer/gcc/build/gcc-test2/powerpc64-unknown-linux-gnu/./libitm/.libs
-lm -o ./vla-1.exe
In function 'f',
inlined from 'main' at
/home/seurer/gcc/gcc-test2/gcc/testsuite/g++.dg/ubsan/vla-1.C:11:4:
/home/seurer/gcc/gcc-test2/gcc/testsuite/g++.dg/ubsan/vla-1.C:6:24: warning:
writing 4 bytes into a region of size 0 [-Wstringop-overflow=]
FAIL: g++.dg/ubsan/vla-1.C -O2 -flto -fuse-linker-plugin -fno-fat-lto-objects
(test for excess errors)
Excess errors:
/home/seurer/gcc/gcc-test2/gcc/testsuite/g++.dg/ubsan/vla-1.C:6:24: warning:
writing 4 bytes into a region of size 0 [-Wstringop-overflow=]
Also, the new test case gcc.dg/strlenopt-70.c introduced in r273783 fails.
spawn -ignore SIGHUP /home/seurer/gcc/build/gcc-test/gcc/xgcc
-B/home/seurer/gcc/build/gcc-test/gcc/
/home/seurer/gcc/gcc-test/gcc/testsuite/gcc.dg/strlenopt-70.c
-fno-diagnostics-show-caret -fno-diagnostics-show-line-numbers
-fdiagnostics-color=never -O2 -fdump-tree-optimized -S -o strlenopt-70.s
PASS: gcc.dg/strlenopt-70.c (test for excess errors)
gcc.dg/strlenopt-70.c: pattern found 4 times
FAIL: gcc.dg/strlenopt-70.c scan-tree-dump-times optimized "strlen" 0
gcc.dg/strlenopt-70.c: pattern found 8 times
FAIL: gcc.dg/strlenopt-70.c scan-tree-dump-times optimized "_not_eliminated_" 0
testcase /home/seurer/gcc/gcc-test/gcc/testsuite/gcc.dg/dg.exp completed in 0
seconds
=== gcc Summary ===
# of expected passes 1
# of unexpected failures 2
