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clang -O0 and -O1 output differently #154

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shao-hua-li opened this issue Nov 24, 2021 · 0 comments

shao-hua-li commented Nov 24, 2021 •

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Hi there,

Version: commit 90a6342 (git head)
Compiler: clang13

I compiled mujs with clang13 -O0 and clang13 -O1, for the following code snippets, mujs would output differently on stack {}:

-'a' + new String%Function
debugger

For clang13 -O0, the last value in stack {} is -nan, while for clang13 -O1, it's nan.

I'm pretty sure it's a compiler issue, so I tried to reduce mujs sourcecode. Interestingly, for the reduced source code, it triggered a gcc bug (https://gcc.gnu.org/bugzilla/show_bug.cgi?id=103406).

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