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// mcpp.cli.cmd_build — CLI parsing + routing for build / run / test /
// clean / dyndep / stage. Implementations live in mcpp.build.prepare,
// mcpp.build.execute, mcpp.dyndep and mcpp.build.stage.
module;
#include <cstdio>
#include <cstdlib>
export module mcpp.cli.cmd_build;
import std;
import mcpplibs.cmdline;
import mcpp.build.prepare;
import mcpp.build.execute;
import mcpp.build.configure;
import mcpp.build.stage;
import mcpp.build.schedule.detach_codegen;
import mcpp.build.test_targets;
import mcpp.dyndep;
import mcpp.log;
import mcpp.project;
import mcpp.manifest;
import mcpp.ui;
namespace mcpp::cli {
// Decide whether a build/test invocation fans out over workspace members, and
// if so which. Fan out when `--workspace` is given, or at a *virtual* workspace
// root with no `-p` (the intuitive "act on the whole workspace"). Returns the
// member paths to iterate, or nullopt for the single-package / single-`-p` /
// rooted-bare path (handled by the existing per-package pipeline).
std::optional<std::vector<std::string>>
workspace_fanout_members(bool wantAll, const std::string& package_filter) {
auto root = mcpp::project::find_manifest_root(std::filesystem::current_path());
if (!root) return std::nullopt;
auto m = mcpp::manifest::load(*root / "mcpp.toml");
if (!m || !m->workspace.present || m->workspace.members.empty()) return std::nullopt;
bool virtualWs = m->package.name.empty();
if (wantAll || (virtualWs && package_filter.empty()))
return m->workspace.members;
return std::nullopt;
}
export int cmd_build(const mcpplibs::cmdline::ParsedArgs& parsed) {
bool verbose = parsed.is_flag_set("verbose") || mcpp::log::is_verbose();
bool print_fp = parsed.is_flag_set("print-fingerprint");
bool no_cache = parsed.is_flag_set("no-cache");
bool configure_only = parsed.is_flag_set("configure-only");
mcpp::build::BuildOverrides ov;
if (auto t = parsed.value("target")) ov.target_triple = *t;
if (auto p = parsed.value("package")) ov.package_filter = *p;
// --cache global|local|off. --no-cache is the deprecated alias for off; the
// old flag only ever cleared target/, which says nothing about a cache, so
// it is expressed in terms of the new one rather than kept as a second axis.
if (auto c = parsed.value("cache")) ov.cache_mode = *c;
else if (no_cache) ov.cache_mode = "off";
// Profile selection precedence: --profile NAME > --release / --dev > the
// project default ([build].default-profile) > "release", resolved in
// prepare_build. --release/--dev are shorthands only.
if (auto pr = parsed.value("profile")) ov.profile = *pr;
else if (parsed.is_flag_set("release")) ov.profile = "release";
else if (parsed.is_flag_set("dev")) ov.profile = "dev";
if (auto fs = parsed.value("features")) ov.features = *fs;
if (auto cp = parsed.value("cap")) ov.capabilities = *cp;
ov.strict = parsed.is_flag_set("strict");
ov.force_static = parsed.is_flag_set("static");
// Fan-out prefixes every diagnostic with the member it came from; the
// single-package path has nothing to disambiguate and passes "".
auto configure_member = [&](mcpp::build::BuildOverrides memberOv,
std::string_view label) -> int {
auto where = [&](std::string_view msg) {
if (label.empty()) std::println(stderr, "error: {}", msg);
else std::println(stderr, "error: {}: {}", label, msg);
};
auto root = mcpp::project::find_manifest_root(std::filesystem::current_path());
if (!root) {
where("no mcpp.toml found in current directory or any parent");
return 2;
}
auto discovered = mcpp::build::discover_test_targets(*root,
memberOv.package_filter);
if (!discovered) {
where(discovered.error());
return 2;
}
// configure-only deliberately includes dev-dependencies and test TUs:
// clangd needs the same include/module surface as `mcpp test`, even
// though Ninja is run in dry-run mode and compiles no object.
// 必须在移动 targets 前读取状态；函数实参的求值顺序未指定。
const bool includeDevDeps = !discovered->targets.empty();
auto ctx = mcpp::build::prepare_build(
print_fp, includeDevDeps,
std::move(discovered->targets), std::move(memberOv));
if (!ctx) {
where(ctx.error());
return 2;
}
return mcpp::build::run_configure_plan(*ctx, verbose);
};
// Workspace fan-out: build every member, one per the existing per-package
// pipeline (continue-on-failure; first non-zero exit wins). Checked before
// the fast path, which is single-package only.
if (auto members = workspace_fanout_members(parsed.is_flag_set("workspace"),
ov.package_filter)) {
int rc = 0;
for (auto& mp : *members) {
mcpp::build::BuildOverrides mo = ov;
mo.package_filter = mp;
if (configure_only) {
int r = configure_member(std::move(mo), mp);
if (r != 0) rc = r;
continue;
}
auto ctx = mcpp::build::prepare_build(print_fp, /*includeDevDeps=*/false,
/*extraTargets=*/{}, mo);
if (!ctx) { std::println(stderr, "error: {}: {}", mp, ctx.error()); rc = 2; continue; }
int r = mcpp::build::run_build_plan(*ctx, verbose, no_cache, mo.target_triple);
if (r != 0) rc = r;
}
return rc;
}
if (configure_only)
return configure_member(std::move(ov), "");
// P0: try fast-path if inputs haven't changed. Any resolution-affecting
// override (--profile/--features/--strict, like --target/--static) must
// bypass it: the cached build.ninja was generated without them, so taking
// the fast path would silently ignore the flags.
if (!print_fp && ov.target_triple.empty() && !ov.force_static
&& ov.profile.empty() && ov.features.empty() && !ov.strict
&& ov.capabilities.empty() && ov.package_filter.empty()
&& ov.cache_mode.empty()) {
auto root = mcpp::project::find_manifest_root(std::filesystem::current_path());
if (root) {
if (auto rc = mcpp::build::try_fast_build(*root, verbose, no_cache)) {
return *rc;
}
}
}
auto ctx = mcpp::build::prepare_build(print_fp, /*includeDevDeps=*/false,
/*extraTargets=*/{}, ov);
if (!ctx) { std::println(stderr, "error: {}", ctx.error()); return 2; }
return mcpp::build::run_build_plan(*ctx, verbose, no_cache, ov.target_triple);
}
export int cmd_run(const mcpplibs::cmdline::ParsedArgs& parsed,
std::span<const std::string> passthrough) {
// The action lambda has already split argv at the first "--" and
// passed post-args as `passthrough`; the only positional we declare
// is the optional binary target name.
std::optional<std::string> targetName;
if (parsed.positional_count() > 0) targetName = parsed.positional(0);
// -p/--package <member>: scope to one workspace member, same flag/rule
// as `mcpp build -p` / `mcpp test -p` (mcpp::project::resolve_member_dir).
// `mcpp run` is single-member only — no `--workspace` fan-out.
std::string package_filter;
if (auto p = parsed.value("package")) package_filter = *p;
std::string cache_mode;
bool no_cache = parsed.is_flag_set("no-cache");
if (auto c = parsed.value("cache")) cache_mode = *c;
else if (no_cache) cache_mode = "off";
return mcpp::build::build_run_target(targetName, passthrough, package_filter,
cache_mode, no_cache);
}
export int cmd_test(const mcpplibs::cmdline::ParsedArgs& parsed,
std::span<const std::string> passthrough) {
// Pre-`--` flags select the build mode for the test build (so e.g.
// `mcpp test --profile contracts` compiles the code-under-test plus the
// test binaries under that profile — a whole-build mode, the right
// granularity for sanitizers / contract evaluation semantics). Post-`--`
// args go to each test binary.
mcpp::build::BuildOverrides ov;
if (auto pr = parsed.value("profile")) ov.profile = *pr;
if (auto fs = parsed.value("features")) ov.features = *fs;
if (auto cp = parsed.value("cap")) ov.capabilities = *cp;
ov.strict = parsed.is_flag_set("strict");
if (auto p = parsed.value("package")) ov.package_filter = *p;
if (auto c = parsed.value("cache")) ov.cache_mode = *c;
else if (parsed.is_flag_set("no-cache")) ov.cache_mode = "off";
mcpp::build::TestOptions to;
if (parsed.positional_count() > 0) to.filter = parsed.positional(0);
to.list = parsed.is_flag_set("list");
// The three deadlines share one parser: they differ only in what they
// bound, not in how they are spelled. 0 always means "no limit" — for
// --timeout that now has to be asked for rather than being the default.
int workspaceTimeoutSecs = 0;
auto read_secs = [&parsed](std::string_view flag, int& out) -> bool {
auto ts = parsed.value(std::string{flag});
if (!ts) return true;
int secs = 0;
auto [p, ec] = std::from_chars(ts->data(), ts->data() + ts->size(), secs);
if (ec != std::errc{} || p != ts->data() + ts->size() || secs < 0) {
mcpp::ui::error(std::format("invalid --{} '{}' (whole seconds >= 0)", flag, *ts));
return false;
}
out = secs;
return true;
};
if (!read_secs("timeout", to.timeoutSecs)) return 2;
if (!read_secs("build-timeout", to.buildTimeoutSecs)) return 2;
if (!read_secs("workspace-timeout", workspaceTimeoutSecs)) return 2;
if (auto mf = parsed.value("message-format")) {
if (*mf == "json") to.format = mcpp::build::TestMessageFormat::Json;
else if (*mf != "human") {
mcpp::ui::error(std::format("unknown --message-format '{}' (human|json)", *mf));
return 2;
}
}
// Workspace fan-out: test every member through run_tests (which scopes its
// discovery to the member). Continue-on-failure + per-member summary so one
// red member never hides the rest.
if (auto members = workspace_fanout_members(parsed.is_flag_set("workspace"),
ov.package_filter)) {
const bool json = (to.format == mcpp::build::TestMessageFormat::Json);
// Silence the ui BEFORE the first member, not inside run_tests. The
// quiet flag used to be set by run_tests itself, so the fan-out's own
// "testing member" line escaped for member #1 and was suppressed from
// #2 on — one stdout stream, two behaviors, and the stray line broke
// NDJSON for any consumer that parsed it strictly.
if (json) mcpp::ui::set_quiet(true);
int rc = 0;
std::vector<std::string> failed;
std::vector<std::string> notRun;
std::vector<std::pair<std::string, long long>> memberTimes;
int totalPassed = 0, totalFailed = 0;
auto tWs = std::chrono::steady_clock::now();
auto ws_ms = [&tWs] {
return std::chrono::duration_cast<std::chrono::milliseconds>(
std::chrono::steady_clock::now() - tWs).count();
};
const long long wsDeadlineMs =
static_cast<long long>(workspaceTimeoutSecs) * 1000;
std::size_t idx = 0;
for (auto& mp : *members) {
++idx;
// Checked BEFORE starting a member rather than after: stopping
// mid-member would leave a half-built member reported as neither
// run nor skipped.
if (wsDeadlineMs > 0 && ws_ms() >= wsDeadlineMs) {
notRun.push_back(mp);
continue;
}
mcpp::build::BuildOverrides mo = ov;
mo.package_filter = mp;
mcpp::ui::status("Workspace",
std::format("testing member '{}' ({}/{})", mp, idx, members->size()));
mcpp::build::TestRunSummary sum;
int r = mcpp::build::run_tests(passthrough, mo, to, &sum);
totalPassed += sum.passed;
totalFailed += sum.failed;
memberTimes.emplace_back(mp, sum.elapsedMs);
auto secs = static_cast<double>(sum.elapsedMs) / 1000.0;
if (r != 0) {
rc = r;
failed.push_back(mp);
mcpp::ui::status("Workspace",
std::format("member '{}' ({}/{}) FAILED — {} passed, {} failed in {:.2f}s",
mp, idx, members->size(), sum.passed, sum.failed, secs));
} else {
mcpp::ui::status("Workspace",
std::format("member '{}' ({}/{}) ok — {} passed in {:.2f}s",
mp, idx, members->size(), sum.passed, secs));
}
}
auto wsElapsed = ws_ms();
if (!notRun.empty()) rc = rc ? rc : 1;
if (json) {
// Member paths are manifest-authored strings, so escape rather
// than assume: one backslash in a member path would otherwise emit
// a stream that is not JSON at all.
auto join = [](const std::vector<std::string>& v) {
std::string s;
for (auto& x : v) {
if (!s.empty()) s += ',';
s += '"';
for (char c : x) {
if (c == '"' || c == '\\') s += '\\';
s += c;
}
s += '"';
}
return s;
};
std::println("{{\"workspace_summary\":{{\"members\":{},\"passed\":{},\"failed\":{},"
"\"failed_members\":[{}],\"not_run\":[{}],\"elapsed_ms\":{}}}}}",
members->size(), totalPassed, totalFailed,
join(failed), join(notRun), wsElapsed);
std::fflush(stdout);
return rc;
}
// Slowest members, printed unconditionally rather than only on failure:
// "which member ate the wall clock" is the question a green-but-slow CI
// run raises, and answering it used to mean reverse-engineering log
// timestamps.
std::ranges::sort(memberTimes, [](auto& a, auto& b) { return a.second > b.second; });
std::string slowest;
for (std::size_t i = 0; i < memberTimes.size() && i < 3; ++i) {
if (memberTimes[i].second < 1000) break;
if (!slowest.empty()) slowest += ", ";
slowest += std::format("{} {:.1f}s", memberTimes[i].first,
static_cast<double>(memberTimes[i].second) / 1000.0);
}
auto join_names = [](const std::vector<std::string>& v) {
std::string s;
for (auto& f : v) { if (!s.empty()) s += ", "; s += f; }
return s;
};
if (failed.empty() && notRun.empty())
mcpp::ui::status("workspace result",
std::format("ok. {} member(s); {} passed; 0 failed; finished in {:.2f}s",
members->size(), totalPassed,
static_cast<double>(wsElapsed) / 1000.0));
else
mcpp::ui::error(std::format(
"workspace test: {}/{} member(s) failed; {} passed; {} failed; "
"finished in {:.2f}s",
failed.size(), members->size(), totalPassed, totalFailed,
static_cast<double>(wsElapsed) / 1000.0));
if (!failed.empty())
mcpp::ui::plain(std::format(" failed members: {}", join_names(failed)));
if (!notRun.empty())
mcpp::ui::plain(std::format(
" not run (--workspace-timeout {}s reached): {}",
workspaceTimeoutSecs, join_names(notRun)));
if (!slowest.empty())
mcpp::ui::plain(std::format(" slowest: {}", slowest));
return rc;
}
return mcpp::build::run_tests(passthrough, ov, to);
}
export int cmd_clean(const mcpplibs::cmdline::ParsedArgs& parsed) {
return mcpp::build::clean_project(parsed.is_flag_set("bmi-cache"));
}
// Hidden subcommand: aggregate P1689 .ddi files into a Ninja dyndep file.
// Invoked by ninja during build (cxx_collect / cxx_dyndep rules).
//
// Multi-file mode (legacy cxx_collect):
// mcpp dyndep --output <build.ninja.dd> <ddi-1> <ddi-2> ...
//
// Single-file mode (P1 per-file dyndep, cxx_dyndep rule):
// mcpp dyndep --single --output <file.dd> <file.ddi>
export int cmd_dyndep(const mcpplibs::cmdline::ParsedArgs& parsed) {
std::filesystem::path outPath = parsed.option_or_empty("output").value();
if (outPath.empty()) {
std::println(stderr, "error: --output <path> required");
return 2;
}
bool single = parsed.is_flag_set("single");
mcpp::dyndep::DyndepOptions opts;
std::string bmiDirStorage = parsed.option_or_empty("bmi-dir").value();
std::string bmiExtStorage = parsed.option_or_empty("bmi-ext").value();
if (!bmiDirStorage.empty())
opts.bmiDir = bmiDirStorage;
if (!bmiExtStorage.empty())
opts.bmiExt = bmiExtStorage;
opts.splitModuleEdges = parsed.is_flag_set("split-module");
std::expected<std::string, std::string> body;
if (single) {
if (parsed.positional_count() != 1) {
std::println(stderr, "error: --single requires exactly one .ddi input");
return 2;
}
// Plan-vs-ddi reconciliation: when the generator declared what the
// planner assumed for this TU, compare against the compiler's own
// scan and fail the edge on divergence (mandatory for
// scan_overrides units; opt-in elsewhere via MCPP_VERIFY_MODGRAPH).
std::string expProvides = parsed.option_or_empty("expect-provides").value();
std::string expImports = parsed.option_or_empty("expect-imports").value();
if (!expProvides.empty() || !expImports.empty() ||
parsed.is_flag_set("expect-none")) {
std::ifstream is{std::filesystem::path{parsed.positional(0)}};
std::string ddiBody{std::istreambuf_iterator<char>(is), {}};
auto unit = mcpp::dyndep::parse_ddi(ddiBody);
if (!unit) {
std::println(stderr, "error: {}: {}", parsed.positional(0), unit.error());
return 1;
}
std::optional<std::string> ep;
if (!expProvides.empty()) ep = expProvides;
std::vector<std::string> ei;
for (std::size_t b = 0; b < expImports.size();) {
auto e = expImports.find(',', b);
if (e == std::string::npos) e = expImports.size();
if (e > b) ei.emplace_back(expImports.substr(b, e - b));
b = e + 1;
}
if (auto err = mcpp::dyndep::verify_unit_expectations(*unit, ep, ei)) {
std::println(stderr, "error: {}", *err);
return 1;
}
}
body = mcpp::dyndep::emit_dyndep_single(parsed.positional(0), opts);
} else {
std::vector<std::filesystem::path> ddis;
for (std::size_t i = 0; i < parsed.positional_count(); ++i)
ddis.emplace_back(parsed.positional(i));
body = mcpp::dyndep::emit_dyndep_from_files(ddis, /*stdImports=*/{}, opts);
}
if (!body) {
std::println(stderr, "error: {}", body.error());
return 1;
}
std::error_code ec;
std::filesystem::create_directories(outPath.parent_path(), ec);
std::ofstream os(outPath);
os << *body;
return os ? 0 : 1;
}
// Invoked by ninja during build (stage_file rule):
// mcpp stage --output <dst> <src>
//
// Publishes a cache-owned artifact (std BMI, std.o, runtime DLL) into the
// build directory. See mcpp.build.stage for the semantics — in particular why
// an already-equivalent destination is left untouched (#311).
export int cmd_stage(const mcpplibs::cmdline::ParsedArgs& parsed) {
std::filesystem::path outPath = parsed.option_or_empty("output").value();
if (outPath.empty()) {
std::println(stderr, "error: --output <path> required");
return 2;
}
if (parsed.positional_count() != 1) {
std::println(stderr, "error: stage requires exactly one source path");
return 2;
}
mcpp::build::stage::StageOptions opts;
std::string verify = parsed.option_or_empty("verify").value();
if (verify.empty()) {
if (const char* e = std::getenv("MCPP_STAGE_VERIFY"); e && *e)
verify = e;
}
if (!verify.empty())
opts.verify = mcpp::build::stage::parse_verify(verify);
auto r = mcpp::build::stage::stage_file(
std::filesystem::path{parsed.positional(0)}, outPath, opts);
if (!r) {
std::println(stderr, "error: {}", r.error().message);
return 1;
}
return 0;
}
// `mcpp bmi-equal A B` — exit 0 when the two BMIs differ only by GCC's embedded
// wall clock. Invoked from the generated `cxx_module` rule in place of `cmp -s`,
// which can never succeed: GCC stamps `buildtime:`/`localtime:` into the BMI
// CONTENT, so two compiles of identical source always differ by four bytes and
// the interface-unchanged fast path never fired. See mcpp.build.stage.
export int cmd_bmi_equal(const mcpplibs::cmdline::ParsedArgs& parsed) {
if (parsed.positional_count() != 2) {
std::println(stderr, "error: bmi-equal requires exactly two paths");
return 2;
}
const bool same = mcpp::build::stage::bmi_equivalent(
std::filesystem::path{parsed.positional(0)},
std::filesystem::path{parsed.positional(1)});
// Exit status IS the answer, so it can drive `if ...; then` in the rule
// exactly the way `cmp -s` did. No output on either path: this runs once per
// module compile and any chatter would land in the build log.
return same ? 0 : 1;
}
// The three edges of the DetachCodegen shape. They are `mcpp` subcommands
// rather than shell fragments for two reasons: the previous BMI-equivalence
// logic lived in the generated ninja command as POSIX shell and was therefore
// SKIPPED ENTIRELY ON WINDOWS, and a shell fragment cannot outlive its shell —
// which is exactly what phase 1 has to do.
//
// `--` separates mcpp's own options from the compiler command line, so a
// compiler flag can never be mistaken for one of ours.
namespace {
// The compiler command, one argument per line, read from a file.
//
// NOT `--`: the cmdline parser implements that separator only at the top level,
// so a subcommand receives nothing after it — silently, with an empty argument
// list rather than an error. A file also sidesteps MAX_ARG_STRLEN (128 KiB for
// a single argv entry, which mcpp has hit before on link lines) and needs no
// quoting rules that a compiler flag could violate.
std::string read_command_file(const std::filesystem::path& path) {
std::ifstream in(path, std::ios::binary);
if (!in) return {};
std::string text((std::istreambuf_iterator<char>(in)),
std::istreambuf_iterator<char>());
while (!text.empty() && (text.back() == '\n' || text.back() == '\r')) text.pop_back();
return text;
}
// `option_or_empty(...).value()`, the idiom the rest of this file uses.
// `parsed.value(name)` looks plausible and returns nothing here — the two are
// not interchangeable, and the difference is silent.
std::string opt_value(const mcpplibs::cmdline::ParsedArgs& parsed, std::string_view name) {
return parsed.option_or_empty(name).value();
}
} // namespace
// Phase 1: start the compiler, return when the BMI is published.
export int cmd_bmi_compile(const mcpplibs::cmdline::ParsedArgs& parsed) {
mcpp::build::schedule::detach::CompileRequest req;
req.bmi = std::filesystem::path{opt_value(parsed, "bmi")};
req.slot = std::filesystem::path{opt_value(parsed, "slot")};
req.self = std::filesystem::path{opt_value(parsed, "self")};
req.semaphore = std::filesystem::path{opt_value(parsed, "sem")};
req.maxCompilers = 0;
if (const auto cap = opt_value(parsed, "cap"); !cap.empty())
std::from_chars(cap.data(), cap.data() + cap.size(), req.maxCompilers);
req.commandFile = std::filesystem::path{opt_value(parsed, "command-file")};
req.depFrom = std::filesystem::path{opt_value(parsed, "dep-from")};
req.depTo = std::filesystem::path{opt_value(parsed, "dep-to")};
req.command = read_command_file(req.commandFile);
if (req.slot.empty()) {
std::println(stderr, "error: bmi-compile needs --slot");
return 2;
}
if (req.command.empty()) {
std::println(stderr, "error: bmi-compile got no command from --command-file");
return 2;
}
return mcpp::build::schedule::detach::compile_release_at_bmi(req);
}
// The supervisor. Detached by phase 1; never named by a build edge.
export int cmd_bmi_supervise(const mcpplibs::cmdline::ParsedArgs& parsed) {
const std::filesystem::path slot{opt_value(parsed, "slot")};
const std::filesystem::path token{opt_value(parsed, "token")};
const auto command = read_command_file(std::filesystem::path{opt_value(parsed, "command-file")});
// Only `--slot` is checked here. An empty COMMAND is handed to supervise()
// on purpose: it is the one place that can record the failure in the file
// both waiters are polling. Returning early instead left them waiting on an
// `.rc` that nobody would ever write.
if (slot.empty()) {
std::println(stderr, "error: bmi-supervise needs --slot");
return 2;
}
return mcpp::build::schedule::detach::supervise(slot, token, command);
}
// Phase 2: join the detached compiler before anything reads its object.
export int cmd_bmi_await(const mcpplibs::cmdline::ParsedArgs& parsed) {
const std::filesystem::path slot{opt_value(parsed, "slot")};
const std::filesystem::path object{opt_value(parsed, "object")};
if (slot.empty()) {
std::println(stderr, "error: bmi-await needs --slot");
return 2;
}
return mcpp::build::schedule::detach::await_unit(slot, object);
}
} // namespace mcpp::cli