It's pretty hard to conclude whether it's a bug in your code or in the compiler, or both, without narrowing down a test case.
On Fri, Oct 25, 2019 at 2:01 PM Hans Åberg <haber...@telia.com> wrote: > So then there probably is an issue with the optimization. > > Just run 'gmp-6.1.2’ with MacPorts clang 9.0.0; I got: > ../../../gmp-6.1.2/test-driver: line 107: 70037 Abort trap: 6 > "$@" > $log_file 2>&1 > FAIL: t-sqrlo > > With Apple clang 11.0.0 (clang-1100.0.33.8), I got another ‘make check’ > error, also only when using optimization: > ../../../gmp-6.1.2/test-driver: line 107: 30266 Segmentation fault: 11 > "$@" > $log_file 2>&1 > FAIL: t-toom53 > > > > On 25 Oct 2019, at 22:53, David Blaikie <dblai...@gmail.com> wrote: > > > > UBSan adds code to check things, it necessarily changes optimizations by > having those checks in. It shouldn't affect the behavior of programs that > don't exhibit UB (but I imagine it could affect the behavior of programs > relying on specific IB (Implementation Defined Behavior)). > > > > Reducing a test case to better understand your code & be able to > portably demonstrate the issue would help to get traction on understanding > the behavior, seeing if it's a clang bug, etc. > >
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