import os

const gettid_compat_vexe = @VEXE
const gettid_compat_tests_dir = os.dir(@FILE)
const gettid_compat_v3_dir = os.dir(gettid_compat_tests_dir)
const gettid_compat_vlib_dir = os.dir(gettid_compat_v3_dir)
const gettid_compat_v3_src = os.join_path(gettid_compat_v3_dir, 'v3.v')

fn gettid_compat_build_v3() string {
    v3_bin := os.join_path(os.temp_dir(), 'v3_gettid_compat_test_${os.getpid()}')
    os.rm(v3_bin) or {}
    build :=
        os.execute('${gettid_compat_vexe} -gc none -path "${gettid_compat_vlib_dir}|@vlib|@vmodules" -o ${v3_bin} ${gettid_compat_v3_src}')
    assert build.exit_code == 0, build.output
    return v3_bin
}

fn test_v_gettid_uses_declared_libc_compat_helper() {
    $if !linux {
        return
    }
    v3_bin := gettid_compat_build_v3()
    src := os.join_path(os.temp_dir(), 'v3_gettid_compat_${os.getpid()}.v')
    bin := os.join_path(os.temp_dir(), 'v3_gettid_compat_${os.getpid()}')
    os.write_file(src, 'module main

#flag -Werror=implicit-function-declaration

fn main() {
    println(v_gettid().str())
}
') or {
        panic(err)
    }
    os.rm(bin) or {}
    os.rm(bin + '.c') or {}
    compile := os.execute('${v3_bin} ${src} -b c -o ${bin}')
    assert compile.exit_code == 0, compile.output
    assert !compile.output.contains('implicit declaration'), compile.output
    generated := os.read_file(bin + '.c') or { panic(err) }
    assert generated.contains('static inline u32 v3_gettid(void)'), generated
    assert generated.contains('syscall(SYS_gettid)'), generated
    assert !generated.contains(' gettid('), generated
    run := os.execute(bin)
    assert run.exit_code == 0, run.output
    assert run.output.trim_space().len > 0, run.output
}