Crafter.Build/tests/CrossArchAarch64/CrossArchAarch64.cpp

/*
Crafter® Build
Copyright (C) 2026 Catcrafts®
Catcrafts.net

LGPL-3.0-only.

End-to-end cross-arch build through the V2 pipeline:
the inner project.cpp targets aarch64-linux-gnu with cfg.sysroot pointing at
the Arch Linux ARM rootfs at /opt/aarch64-rootfs. crafter.build-lib
cross-compiles the C++ source (with the libc++ std module from the sysroot),
produces a real aarch64 ELF, and qemu-aarch64 (with QEMU_LD_PREFIX pointing at
the sysroot so it can find ld-linux-aarch64.so.1) executes it.
*/

import std;
import Crafter.Build;
#include "../_shared/TestUtil.h"
namespace fs = std::filesystem;
using namespace TestUtil;
using namespace Crafter;

namespace {
    bool ToolPresent(std::string_view name) {
        return std::system(std::format("which {} > /dev/null 2>&1", name).c_str()) == 0;
    }
}

int main() {
    try {
        const fs::path sysroot = "/opt/aarch64-rootfs";
        if (!fs::exists(sysroot / "usr/share/libc++/v1/std.cppm")) {
            Skip(std::format("aarch64 sysroot missing at {} — see README", sysroot.string()));
        }
        if (!ToolPresent("qemu-aarch64")) Skip("qemu-aarch64 not on PATH");

        fs::path src = fs::current_path() / "tests" / "CrossArchAarch64" / "inner";
        Configuration cfg = LoadFixture("CrossArchAarch64", src);
        fs::path work = fs::current_path();

        auto br = BuildOnce(cfg);
        if (!br.result.empty()) {
            std::println(std::cerr, "build failed:\n{}", br.result);
            return 1;
        }

        fs::path artifact = cfg.BinDir() / "aarch-hello";
        if (!fs::exists(artifact)) {
            std::println(std::cerr, "expected artifact missing at {}", artifact.string());
            return 1;
        }

        // Defend against silent host-arch fallback.
        auto probe = RunInDir(work, std::format("file '{}'", artifact.string()));
        if (probe.output.find("ARM aarch64") == std::string::npos) {
            std::println(std::cerr, "artifact is not ARM aarch64 ELF:\n{}", probe.output);
            return 1;
        }

        // Run via qemu-aarch64. QEMU_LD_PREFIX tells qemu where the target's
        // dynamic linker (ld-linux-aarch64.so.1) and shared libs live.
        auto run = RunInDir(work, std::format(
            "QEMU_LD_PREFIX={} qemu-aarch64 '{}'",
            sysroot.string(), artifact.string()));
        if (run.exitCode != 0) {
            std::println(std::cerr, "qemu-aarch64 run failed (rc={}):\n{}", run.exitCode, run.output);
            return 1;
        }
        if (run.output != "hi from 64-bit aarch64\n") {
            std::println(std::cerr, "output mismatch:\n  expected: \"hi from 64-bit aarch64\\n\"\n  got: {:?}", run.output);
            return 1;
        }
        return 0;
    } catch (const std::exception& e) {
        std::println(std::cerr, "test exception: {}", e.what());
        return 1;
    }
}