https://gcc.gnu.org/bugzilla/show_bug.cgi?id=102823
Bug ID: 102823
Summary: glm-0.9.9.8 fails on gcc-11 and above
(-fno-strict-aliasing)
Product: gcc
Version: 11.1.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: slyfox at gcc dot gnu.org
Target Milestone: ---
Created attachment 51626
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=51626&action=edit
z.tar.gz
On gcc-10 glm test suite worked successfully. On gcc-11 single test fails as:
glm> The following tests FAILED:
glm> 39 - test-core_func_integer (Failed)
I extracted self-contained example that hopefully illustrates the problem:
$ g++-10 -I. -O2 core_func_integer.cpp -o a && ./a; echo $?
0
$ g++-11 -I. -O2 core_func_integer.cpp -o a && ./a; echo $?
4
$ g++-12 -I. -O2 core_func_integer.cpp -o a && ./a; echo $?
4
Adding -fno-strict-aliasing makes the test pass. Can you help me understand
where alaising violation happens? I tried adding -fopt-info, but there is not
much difference in the output.
