Incompatibility between rustc's libgcc_s_dw2-1.dll and MSYS2 mingw-w64-i686-gcc 11.3

[tspiteri]

When the stable-i686-pc-windows-gnu toolchain's bin directory is at the beginning of the PATH variable (as will happen when using rustup), MSYS2 x86 gcc versions 11.3 and higher fail.

This can be reproduced

• on the MSYS2 MinGW x86 terminal

• install mingw-w64-i686-gcc package version 11.3 or higher (I tested with 11.3.0-2)

• include the toolchain's bin directory at the beginning of the PATH, for example with

    PATH="/c/Users/User/.rustup/toolchains/1.38.0-i686-pc-windows-gnu/bin:$PATH"
  

• try to compile a simple c file, for example gcc a.c with a.c containing only int main () { return 0; }

No a.exe is generated. Repeating with gcc version 11.2 (I tested with 11.2.0-9) will generate a.exe.

With the latest MSYS2 gcc (12.1.0-3) the problem is still there with no a.exe generated.

If libgcc_s_dw2-1.dll is removed from the toolchain's bin directory, a.exe is generated.

(I first thought it was a rustup 1.25 issue and opened rust-lang/rustup#3045, but then I realized the issue is here, or maybe in MSYS2/gcc.)

[mati865]

Does it still happen with up-to-date MSYS2 and nightly recent enough to include #100178 ?

[tspiteri]

The bug seems to be fixed on 1.69.0-beta.3 which does include #100178.