https://gcc.gnu.org/bugzilla/show_bug.cgi?id=102285
Bug ID: 102285 Summary: New flag -ftrivial-auto-var-init=zero causes many crashes in the testsuite Product: gcc Version: 12.0 Status: UNCONFIRMED Severity: normal Priority: P3 Component: c Assignee: unassigned at gcc dot gnu.org Reporter: dcb314 at hotmail dot com Target Milestone: --- For the C source code under gcc/trunk/gcc/testsuite, I did: $ find . -name \*.c -print | sort > file.c.list $ head file.c.list ./ada/acats/tests/cd/cd300051.c ./ada/acats/tests/cxb/cxb30040.c ./ada/acats/tests/cxb/cxb30060.c ./ada/acats/tests/cxb/cxb30130.c ./ada/acats/tests/cxb/cxb30131.c ./c-c++-common/addrtmp.c ./c-c++-common/array-1.c ./c-c++-common/array-5.c ./c-c++-common/array-6.c ./c-c++-common/array-init.c $ wc -l file.c.list 42647 file.c.list $ So I did a bit of light testing: $ for i in `cat file.c.list`; do echo $i; /home/dcb/gcc/results/bin/gcc -c -g -O2 -Wall -ftrivial-auto-var-init=zero $i; done > 11.out 2>&1 $ Normally, this kind of for loop would produce a small number of crashes. Instead, I get 25 and it's only done about 25% of all the C source code files. $ grep -c "\.c$" 11.out 9184 $ The compiler is built with checking enabled. Here are the first few: $ fgrep "internal compiler error:" 11.out | head ./c-c++-common/dfp/func-vararg-size0.c:16:5: internal compiler error: Segmentation fault ./c-c++-common/dfp/struct-layout-1.c:51:5: internal compiler error: Segmentation fault ./c-c++-common/gomp/reduction-1.c:8:1: internal compiler error: Segmentation fault ./c-c++-common/gomp/udr-1.c:11:1: internal compiler error: Segmentation fault ./c-c++-common/torture/pr46137.c:13:1: internal compiler error: Segmentation fault ./c-c++-common/ubsan/bounds-14.c:6:1: internal compiler error: Segmentation fault ./c-c++-common/Warray-bounds-10.c:63:6: internal compiler error: Segmentation fault ./c-c++-common/Warray-bounds-9.c:12:12: internal compiler error: Segmentation fault ./c-c++-common/Wsizeof-pointer-memaccess1.c:71:1: internal compiler error: Segmentation fault ./c-c++-common/Wsizeof-pointer-memaccess2.c:176:1: internal compiler error: Segmentation fault $ The -ftrivial... flag although a good idea, doesn't look ready for prime time yet. I suggest it is removed and the original code reworked until it doesn't cause any "internal compiler error:" for the C testsuite.