cross compile(linux->windows) with CGO failed

[fcying]

Description

I use wails build -platform windows, if use CGO, it can't build.

fcying@home:~/test/wails $ wails build -platform windows
Wails CLI v2.9.1                                                                                                                                                                                                          # Build Options

Platform(s)        | windows
Compiler           | /usr/local/bin/go
Skip Bindings      | false
Build Mode         | production
Devtools           | false
Frontend Directory | /home/fcying/test/wails/frontend
Obfuscated         | false
Skip Frontend      | false
Compress           | false
Package            | true
Clean Bin Dir      | false
LDFlags            |
Tags               | []
Race Detector      | false
                                                                                                                                                                                                                                            # Building target: windows/amd64

  • Generating bindings: Done.
  • Installing frontend dependencies: Done.
  • Compiling frontend: Done.
  • Generating application assets: Done.
  • Compiling application: # wails
./main.go:16:9: undefined: NewApp
  ERROR   exit status 1
  ERROR   exit status 1

after set CC CXX

export CXX=x86_64-w64-mingw32-g++
export CC=x86_64-w64-mingw32-gcc

wails build -platform windows                                                                                                                                                                                    Wails CLI v2.9.1                                                                                                                                                                                                                            

# Build Options

Platform(s)        | windows
Compiler           | /usr/local/bin/go
Skip Bindings      | false
Build Mode         | production
Devtools           | false
Frontend Directory | /home/fcying/test/wails/frontend
Obfuscated         | false
Skip Frontend      | false
Compress           | false
Package            | true
Clean Bin Dir      | false
LDFlags            |
Tags               | []
Race Detector      | false

# Building target: windows/amd64
# Building target: windows/amd64

  • Generating bindings:   ERROR
          # runtime/cgo
          gcc_linux_amd64.c: In function ‘_cgo_sys_thread_start’:
          gcc_linux_amd64.c:57:9: error: unknown type name ‘sigset_t’; did you mean ‘_sigset_t’?
             57 |         sigset_t ign, oset;
                |         ^~~~~~~~
                |         _sigset_t
          gcc_linux_amd64.c:62:9: error: implicit declaration of function ‘sigfillset’ [-Werror=implicit-function-declaration]
             62 |         sigfillset(&ign);
                |         ^~~~~~~~~~
          gcc_linux_amd64.c:57:23: error: unused variable ‘oset’ [-Werror=unused-variable]
             57 |         sigset_t ign, oset;
                |                       ^~~~
          cc1: all warnings being treated as errors

          exit status 1

  ERROR
          # runtime/cgo
          gcc_linux_amd64.c: In function ‘_cgo_sys_thread_start’:
          gcc_linux_amd64.c:57:9: error: unknown type name ‘sigset_t’; did you mean ‘_sigset_t’?
             57 |         sigset_t ign, oset;
                |         ^~~~~~~~
                |         _sigset_t
          gcc_linux_amd64.c:62:9: error: implicit declaration of function ‘sigfillset’ [-Werror=implicit-function-declaration]
             62 |         sigfillset(&ign);
                |         ^~~~~~~~~~
          gcc_linux_amd64.c:57:23: error: unused variable ‘oset’ [-Werror=unused-variable]
             57 |         sigset_t ign, oset;
                |                       ^~~~
          cc1: all warnings being treated as errors

          exit status 1

To Reproduce

1. wails init -t vue-ts -n wails
2. cd wails && wails build -platform windows #build ok
3. add example c code to app.go

package main

/*
void test() {
}
*/
import "C"

4. wails build -platform windows # error
5. export CC=x86_64-w64-mingw32-gcc
6. export CXX=x86_64-w64-mingw32-g++
7. wails build -platform windows # error

Expected behaviour

cross build work fine

Screenshots

No response

Attempted Fixes

No response

System Details

wails doctor


          Wails Doctor


                                                                                                                                                                                                                                            # Wails
Version         | v2.9.1
Package Manager | apt

# System
┌───────────────────────────────────────────────────┐                                                                                                                                                                                       | OS           | Debian GNU/Linux                   |
| Version      | 12                                 |
| ID           | debian                             |
| Go Version   | go1.22.3                           |
| Platform     | linux                              |
| Architecture | amd64                              |
| CPU          | AMD Ryzen 7 5700X 8-Core Processor |
| GPU          | Unknown                            |
| Memory       | 20GB                               |
└───────────────────────────────────────────────────┘

# Dependencies
┌──────────────────────────────────────────────────────────────────────┐                                                                                                                                                                    | Dependency | Package Name          | Status    | Version             |
| *docker    | docker.io             | Available | 20.10.24+dfsg1-1+b3 |
| gcc        | build-essential       | Installed | 12.9                |
| libgtk-3   | libgtk-3-dev          | Installed | 3.24.38-2~deb12u1   |
| libwebkit  | libwebkit2gtk-4.0-dev | Installed | 2.44.3-1~deb12u1    |
| npm        | npm                   | Installed | 10.5.0              |
| *nsis      | nsis                  | Available | 3.08-3+deb12u1      |
| pkg-config | pkg-config            | Installed | 1.8.1-1             |
└────────────────────── * - Optional Dependency ───────────────────────┘

# Diagnosis
Optional package(s) installation details:
  - docker: sudo apt install docker.io
  - nsis: sudo apt install nsis

 SUCCESS  Your system is ready for Wails development!

### Additional context

_No response_