Calling a function declared as weak causes a segfault

[HolyBlackCat]

Description / Steps to reproduce the issue

Consider following code: 1.cpp

__attribute__((__weak__)) void foo();

int main() {foo();}

2.cpp

__attribute__((__weak__)) void foo() {}

Run g++ 1.cpp 2.cpp && ./a.exe.

Expected behavior

No runtime or compile-time errors. (Also no errors if I remove the attribute from the declaration and/or definition, but this.)

Actual behavior

This segfaults.

If only the definition has the attribute, then I get an undefined reference.

If only the declaration has the attribute, then the code works (but this is unconvenient, since it means you either can't declare the function in a header, or have to use macros to conditionally remove the attribute from it).

Verification

• [X] I have verified that my MSYS2 is up-to-date before submitting the report (see https://www.msys2.org/docs/updating/)

Windows Version

MINGW64_NT-10.0-19045

MINGW environments affected

(didn't test others)

• [X] MINGW64
• [ ] MINGW32
• [X] UCRT64
• [ ] CLANG64
• [ ] CLANG32
• [ ] CLANGARM64

Are you willing to submit a PR?

No response