Linker error when compiling with -cc clang on Windows

[zeozeozeo]

Describe the bug

V doesn't link with user32 on Windows, so the MessageBoxA call in gcboehm is an unresolved symbol.

Reproduction Steps

Compile this with v -cc clang . on Windows:

fn main() {
}

Expected Behavior

No linker errors

Current Behavior

...
22 warnings generated.
LINK : warning LNK4044: unrecognized option '/stack=16777216'; ignored
4dff8b4b7f125d28de505b053831e68b.module.builtin.o : error LNK2019: unresolved external symbol __imp_MessageBoxA referenced in function GC_copy_bl
C:\Users\user\Desktop\Code\tests\test.exe : fatal error LNK1120: 1 unresolved externals
clang: error: linker command failed with exit code 1120 (use -v to see invocation)
builder error:
==================
C error. This should never happen.

This is a compiler bug, please report it using `v bug file.v`.

https://github.com/vlang/v/issues/new/choose

You can also use #help on Discord: https://discord.gg/vlang

Possible Solution

Insert a #flag -luser32 when compiling on Windows in vlib/builtin/builtin_d_gcboehm.c.v.

Additional Information/Context

Works with v -cflags "-luser32" -cc clang .

V version

V 0.4.4 abd2b64

Environment details (OS name and version, etc.)

V 0.4.4 abd2b64

C:\Users\user\Desktop\Code\leaflang>v doctor
V full version: V 0.4.4 5306469.abd2b64
OS: windows, Microsoft Windows 10 Pro v19045 64-bit
Processor: 20 cpus, 64bit, little endian,

getwd: C:\Users\user\Desktop\Code\leaflang
vexe: C:\Users\user\Desktop\Code\v\v.exe
vexe mtime: 2024-02-03 20:04:45

vroot: OK, value: C:\Users\user\Desktop\Code\v
VMODULES: OK, value: C:\Users\user\.vmodules
VTMP: OK, value: C:\Users\user\AppData\Local\Temp\v_0

Git version: git version 2.42.0.windows.1
Git vroot status: weekly.2024.05-20-gabd2b647
.git/config present: true

CC version: Error: 'cc' is not recognized as an internal or external command,
operable program or batch file.

thirdparty/tcc status: thirdparty-windows-amd64 a39eb79b

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[felipensp]

Can you provide the PR? @zeozeozeo