220 lines
8.7 KiB
Zig
220 lines
8.7 KiB
Zig
const root = @import("@build");
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const std = @import("std");
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const builtin = @import("builtin");
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const io = std.io;
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const fmt = std.fmt;
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const Builder = std.build.Builder;
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const mem = std.mem;
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const process = std.process;
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const ArrayList = std.ArrayList;
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const warn = std.debug.warn;
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const File = std.fs.File;
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pub fn main() !void {
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// Here we use an ArenaAllocator backed by a DirectAllocator because a build is a short-lived,
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// one shot program. We don't need to waste time freeing memory and finding places to squish
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// bytes into. So we free everything all at once at the very end.
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var arena = std.heap.ArenaAllocator.init(std.heap.page_allocator);
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defer arena.deinit();
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const allocator = &arena.allocator;
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var args = try process.argsAlloc(allocator);
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defer process.argsFree(allocator, args);
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// skip my own exe name
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var arg_idx: usize = 1;
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const zig_exe = nextArg(args, &arg_idx) orelse {
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warn("Expected first argument to be path to zig compiler\n", .{});
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return error.InvalidArgs;
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};
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const build_root = nextArg(args, &arg_idx) orelse {
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warn("Expected second argument to be build root directory path\n", .{});
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return error.InvalidArgs;
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};
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const cache_root = nextArg(args, &arg_idx) orelse {
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warn("Expected third argument to be cache root directory path\n", .{});
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return error.InvalidArgs;
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};
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const builder = try Builder.create(allocator, zig_exe, build_root, cache_root);
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defer builder.destroy();
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var targets = ArrayList([]const u8).init(allocator);
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const stderr_stream = io.getStdErr().outStream();
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const stdout_stream = io.getStdOut().outStream();
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while (nextArg(args, &arg_idx)) |arg| {
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if (mem.startsWith(u8, arg, "-D")) {
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const option_contents = arg[2..];
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if (option_contents.len == 0) {
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warn("Expected option name after '-D'\n\n", .{});
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return usageAndErr(builder, false, stderr_stream);
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}
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if (mem.indexOfScalar(u8, option_contents, '=')) |name_end| {
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const option_name = option_contents[0..name_end];
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const option_value = option_contents[name_end + 1 ..];
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if (try builder.addUserInputOption(option_name, option_value))
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return usageAndErr(builder, false, stderr_stream);
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} else {
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if (try builder.addUserInputFlag(option_contents))
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return usageAndErr(builder, false, stderr_stream);
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}
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} else if (mem.startsWith(u8, arg, "-")) {
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if (mem.eql(u8, arg, "--verbose")) {
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builder.verbose = true;
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} else if (mem.eql(u8, arg, "--help")) {
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return usage(builder, false, stdout_stream);
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} else if (mem.eql(u8, arg, "--prefix")) {
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builder.install_prefix = nextArg(args, &arg_idx) orelse {
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warn("Expected argument after --prefix\n\n", .{});
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return usageAndErr(builder, false, stderr_stream);
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};
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} else if (mem.eql(u8, arg, "--search-prefix")) {
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const search_prefix = nextArg(args, &arg_idx) orelse {
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warn("Expected argument after --search-prefix\n\n", .{});
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return usageAndErr(builder, false, stderr_stream);
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};
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builder.addSearchPrefix(search_prefix);
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} else if (mem.eql(u8, arg, "--override-lib-dir")) {
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builder.override_lib_dir = nextArg(args, &arg_idx) orelse {
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warn("Expected argument after --override-lib-dir\n\n", .{});
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return usageAndErr(builder, false, stderr_stream);
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};
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} else if (mem.eql(u8, arg, "--verbose-tokenize")) {
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builder.verbose_tokenize = true;
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} else if (mem.eql(u8, arg, "--verbose-ast")) {
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builder.verbose_ast = true;
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} else if (mem.eql(u8, arg, "--verbose-link")) {
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builder.verbose_link = true;
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} else if (mem.eql(u8, arg, "--verbose-ir")) {
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builder.verbose_ir = true;
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} else if (mem.eql(u8, arg, "--verbose-llvm-ir")) {
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builder.verbose_llvm_ir = true;
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} else if (mem.eql(u8, arg, "--verbose-cimport")) {
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builder.verbose_cimport = true;
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} else if (mem.eql(u8, arg, "--verbose-cc")) {
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builder.verbose_cc = true;
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} else if (mem.eql(u8, arg, "--verbose-llvm-cpu-features")) {
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builder.verbose_llvm_cpu_features = true;
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} else if (mem.eql(u8, arg, "--")) {
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builder.args = argsRest(args, arg_idx);
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break;
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} else {
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warn("Unrecognized argument: {}\n\n", .{arg});
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return usageAndErr(builder, false, stderr_stream);
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}
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} else {
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try targets.append(arg);
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}
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}
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builder.resolveInstallPrefix();
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try runBuild(builder);
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if (builder.validateUserInputDidItFail())
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return usageAndErr(builder, true, stderr_stream);
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builder.make(targets.toSliceConst()) catch |err| {
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switch (err) {
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error.InvalidStepName => {
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return usageAndErr(builder, true, stderr_stream);
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},
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error.UncleanExit => process.exit(1),
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else => return err,
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}
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};
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}
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fn runBuild(builder: *Builder) anyerror!void {
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switch (@typeInfo(@TypeOf(root.build).ReturnType)) {
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.Void => root.build(builder),
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.ErrorUnion => try root.build(builder),
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else => @compileError("expected return type of build to be 'void' or '!void'"),
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}
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}
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fn usage(builder: *Builder, already_ran_build: bool, out_stream: var) !void {
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// run the build script to collect the options
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if (!already_ran_build) {
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builder.setInstallPrefix(null);
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builder.resolveInstallPrefix();
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try runBuild(builder);
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}
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try out_stream.print(
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\\Usage: {} build [steps] [options]
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\\
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\\Steps:
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\\
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, .{builder.zig_exe});
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const allocator = builder.allocator;
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for (builder.top_level_steps.toSliceConst()) |top_level_step| {
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const name = if (&top_level_step.step == builder.default_step)
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try fmt.allocPrint(allocator, "{} (default)", .{top_level_step.step.name})
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else
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top_level_step.step.name;
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try out_stream.print(" {s:22} {}\n", .{ name, top_level_step.description });
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}
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try out_stream.writeAll(
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\\
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\\General Options:
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\\ --help Print this help and exit
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\\ --verbose Print commands before executing them
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\\ --prefix [path] Override default install prefix
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\\ --search-prefix [path] Add a path to look for binaries, libraries, headers
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\\
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\\Project-Specific Options:
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\\
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);
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if (builder.available_options_list.len == 0) {
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try out_stream.print(" (none)\n", .{});
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} else {
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for (builder.available_options_list.toSliceConst()) |option| {
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const name = try fmt.allocPrint(allocator, " -D{}=[{}]", .{
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option.name,
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Builder.typeIdName(option.type_id),
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});
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defer allocator.free(name);
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try out_stream.print("{s:24} {}\n", .{ name, option.description });
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}
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}
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try out_stream.writeAll(
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\\
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\\Advanced Options:
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\\ --build-file [file] Override path to build.zig
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\\ --cache-dir [path] Override path to zig cache directory
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\\ --override-lib-dir [arg] Override path to Zig lib directory
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\\ --verbose-tokenize Enable compiler debug output for tokenization
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\\ --verbose-ast Enable compiler debug output for parsing into an AST
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\\ --verbose-link Enable compiler debug output for linking
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\\ --verbose-ir Enable compiler debug output for Zig IR
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\\ --verbose-llvm-ir Enable compiler debug output for LLVM IR
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\\ --verbose-cimport Enable compiler debug output for C imports
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\\ --verbose-cc Enable compiler debug output for C compilation
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\\ --verbose-llvm-cpu-features Enable compiler debug output for LLVM CPU features
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\\
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);
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}
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fn usageAndErr(builder: *Builder, already_ran_build: bool, out_stream: var) void {
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usage(builder, already_ran_build, out_stream) catch {};
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process.exit(1);
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}
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fn nextArg(args: [][]const u8, idx: *usize) ?[]const u8 {
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if (idx.* >= args.len) return null;
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defer idx.* += 1;
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return args[idx.*];
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}
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fn argsRest(args: [][]const u8, idx: usize) ?[][]const u8 {
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if (idx >= args.len) return null;
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return args[idx..];
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}
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