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-Zvirtual-function-elimination miscompiles simple hello world program if other optimizations are turned on #98132

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matthiaskrgr opened this issue Jun 15, 2022 · 0 comments
Open

-Zvirtual-function-elimination miscompiles simple hello world program if other optimizations are turned on #98132

matthiaskrgr opened this issue Jun 15, 2022 · 0 comments
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A-LLVM Area: Code generation parts specific to LLVM. Both correctness bugs and optimization-related issues. C-bug Category: This is a bug. I-crash Issue: The compiler crashes (SIGSEGV, SIGABRT, etc). Use I-ICE instead when the compiler panics. requires-nightly This issue requires a nightly compiler in some way. T-compiler Relevant to the compiler team, which will review and decide on the PR/issue.

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cargo new foo
cd foo
rustc  -Clto  -Cembed-bitcode=yes -Zvirtual-function-elimination src/main.rs 
./main # this works
> Hello, world!
rustc  -Clto  -Cembed-bitcode=yes -Zvirtual-function-elimination src/main.rs -Copt-level=1
./main
> [1]    2203089 segmentation fault (core dumped)  ./main

cc #96285

rustc 1.63.0-nightly (389352c4b 2022-06-15)
binary: rustc
commit-hash: 389352c4bbd56024eefd1566e06dcba04d223f92
commit-date: 2022-06-15
host: x86_64-unknown-linux-gnu
release: 1.63.0-nightly
LLVM version: 14.0.5
@matthiaskrgr matthiaskrgr added I-crash Issue: The compiler crashes (SIGSEGV, SIGABRT, etc). Use I-ICE instead when the compiler panics. A-LLVM Area: Code generation parts specific to LLVM. Both correctness bugs and optimization-related issues. C-bug Category: This is a bug. requires-nightly This issue requires a nightly compiler in some way. labels Jun 15, 2022
@Nilstrieb Nilstrieb added the T-compiler Relevant to the compiler team, which will review and decide on the PR/issue. label Apr 5, 2023
@matthiaskrgr matthiaskrgr mentioned this issue Jun 28, 2023
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A-LLVM Area: Code generation parts specific to LLVM. Both correctness bugs and optimization-related issues. C-bug Category: This is a bug. I-crash Issue: The compiler crashes (SIGSEGV, SIGABRT, etc). Use I-ICE instead when the compiler panics. requires-nightly This issue requires a nightly compiler in some way. T-compiler Relevant to the compiler team, which will review and decide on the PR/issue.
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