Messages in this thread | | | Date | Wed, 6 Apr 2022 11:53:15 +0200 | From | Jakub Jelinek <> | Subject | Re: older gccs and case labels producing integer constants |
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On Tue, Apr 05, 2022 at 12:36:58PM +0200, Borislav Petkov wrote: > On Tue, Apr 05, 2022 at 12:06:45PM +0200, Richard Biener wrote: > > Wird auch mit gcc 11 rejected. Kanns sein dass mit gcc 7 andere > > compiler flags genommen werden? > > Found it: > > $ gcc -fsanitize=shift -c switch.c > switch.c: In function ‘foo’: > switch.c:10:7: error: case label does not reduce to an integer constant > case (((0xfc08) << 16) | (0x0101)):; > > $ gcc --version > gcc (SUSE Linux) 7.4.1 20190905 [gcc-7-branch revision 275407] > Copyright (C) 2017 Free Software Foundation, Inc. > > Something not fully backported?
That is rejected with -fsanitize=shift even on current trunk (in C, C++ is fine). C++ constexpr code has cases for ubsan builtins and internal functions, but C just doesn't handle those apparently.
Jakub
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