Remove undefined behavior caught by LLVM 10 UBSAN. #2108
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This was referenced Oct 4, 2023
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LLVM 10's UBSAN catches several cases of undefined behavior when running the test suite:
jv_getcast array indices to an int, even if the index is out of range. I added a bounds check.Additionally, I added
-fno-sanitize-recover=undefinedto the CFLAGS, which is necessary to make UBSAN actually crash the program (and therefore fail the tests) instead of just logging an error.