Linker error on dynamic library

[x07x08]

Zig Version

0.14.0

Steps to Reproduce and Observed Behavior

Trying to build an executable that uses webui as a dynamic library on Windows with, and only with debug symbols should produce the following error :

error: lld-link: _gnu_exception_handler was replaced

Expected Behavior

No build errors.

Reproducible example

buggy.zip

Notes

I am unsure if this is the only library with this issue, but I did notice that compiling it with gcc does not export that symbol anywhere.

Closed issue from webui

[AlbertShown]

Using https://github.com/x07x08/waveboard

install
└─ install waveboard_zig
   └─ zig build-exe waveboard_zig Debug x86_64-windows-gnu 1 errors
error: lld-link: _gnu_exception_handler was replaced

[alexrp]

We now include winpthreads in mingw32.lib, and it contains this code, which is likely where the problem is:

zig/lib/libc/mingw/winpthreads/thread.c

Lines 1562 to 1565 in 982c500

	"\t.seh_handlerdata\n"
	"\t.long 1\n"
	"\t.rva .tl_start, .tl_end, _gnu_exception_handler ,.tl_end\n"
	"\t.text"

I'm not sure why it happens though. There's code in the CRT that does similar stuff:

zig/lib/libc/mingw/crt/crtexe.c

Lines 164 to 167 in 982c500

	"\t.seh_handlerdata\n"
	"\t.long 1\n"
	"\t.rva .l_startw, .l_endw, _gnu_exception_handler ,.l_endw\n"
	"\t.text");

But maybe the key is that the CRT code declares the function prototype earlier, which includes CALLBACK (i.e. __stdcall):

zig/lib/libc/mingw/crt/crtexe.c

Line 67 in 982c500

long CALLBACK _gnu_exception_handler (EXCEPTION_POINTERS * exception_data);

Will investigate further.

[AlbertShown]

Thank you @alexrp for investigating on this.
Looking forward to hearing from you.

[AlbertShown]

Thank you @alexrp