mirror of
https://codeberg.org/ziglang/zig.git
synced 2025-12-09 15:19:07 +00:00
7eb0a3edce
Rather than `zig0 build ...` the build now does `zig0 build-lib ...`, avoiding the requirement of linking the build script, and thus avoiding the requirement of finding native libc, for systems where libc is the system ABI.
501 lines
19 KiB
Zig
501 lines
19 KiB
Zig
const std = @import("std");
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const builtin = @import("builtin");
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const util = @import("util.zig");
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const Target = std.Target;
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const fs = std.fs;
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const Allocator = std.mem.Allocator;
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const Batch = std.event.Batch;
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const is_darwin = Target.current.isDarwin();
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const is_windows = Target.current.isWindows();
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const is_freebsd = Target.current.isFreeBSD();
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const is_netbsd = Target.current.isNetBSD();
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const is_linux = Target.current.isLinux();
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const is_dragonfly = Target.current.isDragonFlyBSD();
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const is_gnu = Target.current.isGnu();
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usingnamespace @import("windows_sdk.zig");
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/// See the render function implementation for documentation of the fields.
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pub const LibCInstallation = struct {
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include_dir: ?[:0]const u8 = null,
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sys_include_dir: ?[:0]const u8 = null,
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crt_dir: ?[:0]const u8 = null,
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static_crt_dir: ?[:0]const u8 = null,
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msvc_lib_dir: ?[:0]const u8 = null,
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kernel32_lib_dir: ?[:0]const u8 = null,
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pub const FindError = error{
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OutOfMemory,
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FileSystem,
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UnableToSpawnCCompiler,
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CCompilerExitCode,
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CCompilerCrashed,
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CCompilerCannotFindHeaders,
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LibCRuntimeNotFound,
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LibCStdLibHeaderNotFound,
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LibCKernel32LibNotFound,
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UnsupportedArchitecture,
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};
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pub fn parse(
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allocator: *Allocator,
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libc_file: []const u8,
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stderr: *std.io.OutStream(fs.File.WriteError),
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) !LibCInstallation {
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var self: LibCInstallation = .{};
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const fields = std.meta.fields(LibCInstallation);
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const FoundKey = struct {
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found: bool,
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allocated: ?[:0]u8,
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};
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var found_keys = [1]FoundKey{FoundKey{ .found = false, .allocated = null }} ** fields.len;
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errdefer {
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self = .{};
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for (found_keys) |found_key| {
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if (found_key.allocated) |s| allocator.free(s);
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}
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}
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const contents = try std.io.readFileAlloc(allocator, libc_file);
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defer allocator.free(contents);
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var it = std.mem.tokenize(contents, "\n");
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while (it.next()) |line| {
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if (line.len == 0 or line[0] == '#') continue;
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var line_it = std.mem.separate(line, "=");
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const name = line_it.next() orelse {
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try stderr.print("missing equal sign after field name\n", .{});
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return error.ParseError;
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};
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const value = line_it.rest();
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inline for (fields) |field, i| {
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if (std.mem.eql(u8, name, field.name)) {
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found_keys[i].found = true;
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if (value.len == 0) {
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@field(self, field.name) = null;
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} else {
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found_keys[i].allocated = try std.mem.dupeZ(allocator, u8, value);
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@field(self, field.name) = found_keys[i].allocated;
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}
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break;
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}
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}
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}
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inline for (fields) |field, i| {
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if (!found_keys[i].found) {
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try stderr.print("missing field: {}\n", .{field.name});
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return error.ParseError;
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}
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}
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if (self.include_dir == null) {
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try stderr.print("include_dir may not be empty\n", .{});
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return error.ParseError;
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}
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if (self.sys_include_dir == null) {
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try stderr.print("sys_include_dir may not be empty\n", .{});
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return error.ParseError;
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}
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if (self.crt_dir == null and is_darwin) {
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try stderr.print("crt_dir may not be empty for {}\n", .{@tagName(Target.current.getOs())});
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return error.ParseError;
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}
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if (self.static_crt_dir == null and is_windows and is_gnu) {
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try stderr.print("static_crt_dir may not be empty for {}-{}\n", .{
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@tagName(Target.current.getOs()),
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@tagName(Target.current.getAbi()),
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});
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return error.ParseError;
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}
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if (self.msvc_lib_dir == null and is_windows and !is_gnu) {
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try stderr.print("msvc_lib_dir may not be empty for {}-{}\n", .{
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@tagName(Target.current.getOs()),
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@tagName(Target.current.getAbi()),
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});
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return error.ParseError;
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}
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if (self.kernel32_lib_dir == null and is_windows and !is_gnu) {
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try stderr.print("kernel32_lib_dir may not be empty for {}-{}\n", .{
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@tagName(Target.current.getOs()),
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@tagName(Target.current.getAbi()),
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});
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return error.ParseError;
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}
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return self;
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}
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pub fn render(self: LibCInstallation, out: *std.io.OutStream(fs.File.WriteError)) !void {
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@setEvalBranchQuota(4000);
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const include_dir = self.include_dir orelse "";
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const sys_include_dir = self.sys_include_dir orelse "";
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const crt_dir = self.crt_dir orelse "";
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const static_crt_dir = self.static_crt_dir orelse "";
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const msvc_lib_dir = self.msvc_lib_dir orelse "";
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const kernel32_lib_dir = self.kernel32_lib_dir orelse "";
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try out.print(
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\\# The directory that contains `stdlib.h`.
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\\# On POSIX-like systems, include directories be found with: `cc -E -Wp,-v -xc /dev/null`
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\\include_dir={}
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\\
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\\# The system-specific include directory. May be the same as `include_dir`.
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\\# On Windows it's the directory that includes `vcruntime.h`.
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\\# On POSIX it's the directory that includes `sys/errno.h`.
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\\sys_include_dir={}
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\\
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\\# The directory that contains `crt1.o` or `crt2.o`.
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\\# On POSIX, can be found with `cc -print-file-name=crt1.o`.
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\\# Not needed when targeting MacOS.
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\\crt_dir={}
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\\
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\\# The directory that contains `crtbegin.o`.
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\\# On POSIX, can be found with `cc -print-file-name=crtbegin.o`.
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\\# Not needed when targeting MacOS.
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\\static_crt_dir={}
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\\
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\\# The directory that contains `vcruntime.lib`.
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\\# Only needed when targeting MSVC on Windows.
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\\msvc_lib_dir={}
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\\
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\\# The directory that contains `kernel32.lib`.
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\\# Only needed when targeting MSVC on Windows.
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\\kernel32_lib_dir={}
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\\
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, .{
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include_dir,
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sys_include_dir,
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crt_dir,
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static_crt_dir,
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msvc_lib_dir,
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kernel32_lib_dir,
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});
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}
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/// Finds the default, native libc.
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pub fn findNative(allocator: *Allocator) !LibCInstallation {
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var self: LibCInstallation = .{};
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if (is_windows) {
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if (is_gnu) {
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var batch = Batch(FindError!void, 3, .auto_async).init();
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batch.add(&async self.findNativeIncludeDirPosix(allocator));
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batch.add(&async self.findNativeCrtDirPosix(allocator));
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batch.add(&async self.findNativeStaticCrtDirPosix(allocator));
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try batch.wait();
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} else {
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var sdk: *ZigWindowsSDK = undefined;
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switch (zig_find_windows_sdk(&sdk)) {
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.None => {
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defer zig_free_windows_sdk(sdk);
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var batch = Batch(FindError!void, 5, .auto_async).init();
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batch.add(&async self.findNativeMsvcIncludeDir(allocator, sdk));
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batch.add(&async self.findNativeMsvcLibDir(allocator, sdk));
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batch.add(&async self.findNativeKernel32LibDir(allocator, sdk));
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batch.add(&async self.findNativeIncludeDirWindows(allocator, sdk));
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batch.add(&async self.findNativeCrtDirWindows(allocator, sdk));
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try batch.wait();
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},
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.OutOfMemory => return error.OutOfMemory,
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.NotFound => return error.NotFound,
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.PathTooLong => return error.NotFound,
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}
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}
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} else {
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try blk: {
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var batch = Batch(FindError!void, 2, .auto_async).init();
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errdefer batch.wait() catch {};
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batch.add(&async self.findNativeIncludeDirPosix(allocator));
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if (is_freebsd or is_netbsd) {
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self.crt_dir = try std.mem.dupeZ(allocator, u8, "/usr/lib");
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} else if (is_linux or is_dragonfly) {
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batch.add(&async self.findNativeCrtDirPosix(allocator));
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}
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break :blk batch.wait();
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};
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}
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return self;
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}
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/// Must be the same allocator passed to `parse` or `findNative`.
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pub fn deinit(self: *LibCInstallation, allocator: *Allocator) void {
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const fields = std.meta.fields(LibCInstallation);
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inline for (fields) |field| {
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if (@field(self, field.name)) |payload| {
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allocator.free(payload);
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}
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}
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self.* = undefined;
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}
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fn findNativeIncludeDirPosix(self: *LibCInstallation, allocator: *Allocator) FindError!void {
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const dev_null = if (is_windows) "nul" else "/dev/null";
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const cc_exe = std.os.getenvZ("CC") orelse default_cc_exe;
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const argv = [_][]const u8{
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cc_exe,
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"-E",
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"-Wp,-v",
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"-xc",
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dev_null,
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};
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const max_bytes = 1024 * 1024;
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const exec_res = std.ChildProcess.exec(allocator, &argv, null, null, max_bytes) catch |err| switch (err) {
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error.OutOfMemory => return error.OutOfMemory,
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else => return error.UnableToSpawnCCompiler,
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};
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defer {
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allocator.free(exec_res.stdout);
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allocator.free(exec_res.stderr);
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}
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switch (exec_res.term) {
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.Exited => |code| if (code != 0) return error.CCompilerExitCode,
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else => return error.CCompilerCrashed,
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}
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var it = std.mem.tokenize(exec_res.stderr, "\n\r");
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var search_paths = std.ArrayList([]const u8).init(allocator);
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defer search_paths.deinit();
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while (it.next()) |line| {
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if (line.len != 0 and line[0] == ' ') {
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try search_paths.append(line);
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}
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}
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if (search_paths.len == 0) {
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return error.CCompilerCannotFindHeaders;
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}
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const include_dir_example_file = "stdlib.h";
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const sys_include_dir_example_file = if (is_windows) "sys\\types.h" else "sys/errno.h";
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var path_i: usize = 0;
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while (path_i < search_paths.len) : (path_i += 1) {
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// search in reverse order
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const search_path_untrimmed = search_paths.at(search_paths.len - path_i - 1);
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const search_path = std.mem.trimLeft(u8, search_path_untrimmed, " ");
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var search_dir = fs.cwd().openDirList(search_path) catch |err| switch (err) {
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error.FileNotFound,
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error.NotDir,
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error.NoDevice,
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=> continue,
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else => return error.FileSystem,
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};
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defer search_dir.close();
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if (self.include_dir == null) {
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if (search_dir.accessZ(include_dir_example_file, .{})) |_| {
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self.include_dir = try std.mem.dupeZ(allocator, u8, search_path);
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} else |err| switch (err) {
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error.FileNotFound => {},
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else => return error.FileSystem,
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}
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}
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if (self.sys_include_dir == null) {
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if (search_dir.accessZ(sys_include_dir_example_file, .{})) |_| {
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self.sys_include_dir = try std.mem.dupeZ(allocator, u8, search_path);
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} else |err| switch (err) {
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error.FileNotFound => {},
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else => return error.FileSystem,
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}
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}
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if (self.include_dir != null and self.sys_include_dir != null) {
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// Success.
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return;
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}
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}
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return error.LibCStdLibHeaderNotFound;
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}
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fn findNativeIncludeDirWindows(self: *LibCInstallation, allocator: *Allocator, sdk: *ZigWindowsSDK) !void {
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var search_buf: [2]Search = undefined;
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const searches = fillSearch(&search_buf, sdk);
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var result_buf = try std.Buffer.initSize(allocator, 0);
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defer result_buf.deinit();
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for (searches) |search| {
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result_buf.shrink(0);
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const stream = &std.io.BufferOutStream.init(&result_buf).stream;
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try stream.print("{}\\Include\\{}\\ucrt", .{ search.path, search.version });
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var dir = fs.cwd().openDirList(result_buf.toSliceConst()) catch |err| switch (err) {
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error.FileNotFound,
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error.NotDir,
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error.NoDevice,
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=> continue,
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else => return error.FileSystem,
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};
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defer dir.close();
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dir.accessZ("stdlib.h", .{}) catch |err| switch (err) {
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error.FileNotFound => continue,
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else => return error.FileSystem,
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};
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self.include_dir = result_buf.toOwnedSlice();
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return;
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}
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return error.LibCStdLibHeaderNotFound;
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}
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fn findNativeCrtDirWindows(self: *LibCInstallation, allocator: *Allocator, sdk: *ZigWindowsSDK) FindError!void {
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var search_buf: [2]Search = undefined;
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const searches = fillSearch(&search_buf, sdk);
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var result_buf = try std.Buffer.initSize(allocator, 0);
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defer result_buf.deinit();
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const arch_sub_dir = switch (builtin.arch) {
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.i386 => "x86",
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.x86_64 => "x64",
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.arm, .armeb => "arm",
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else => return error.UnsupportedArchitecture,
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};
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for (searches) |search| {
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result_buf.shrink(0);
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const stream = &std.io.BufferOutStream.init(&result_buf).stream;
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try stream.print("{}\\Lib\\{}\\ucrt\\{}", .{ search.path, search.version, arch_sub_dir });
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var dir = fs.cwd().openDirList(result_buf.toSliceConst()) catch |err| switch (err) {
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error.FileNotFound,
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error.NotDir,
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error.NoDevice,
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=> continue,
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else => return error.FileSystem,
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};
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defer dir.close();
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dir.accessZ("ucrt.lib", .{}) catch |err| switch (err) {
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error.FileNotFound => continue,
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else => return error.FileSystem,
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};
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self.crt_dir = result_buf.toOwnedSlice();
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return;
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}
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return error.LibCRuntimeNotFound;
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}
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fn findNativeCrtDirPosix(self: *LibCInstallation, allocator: *Allocator) FindError!void {
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self.crt_dir = try ccPrintFileName(allocator, "crt1.o", .only_dir);
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}
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fn findNativeStaticCrtDirPosix(self: *LibCInstallation, allocator: *Allocator) FindError!void {
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self.static_crt_dir = try ccPrintFileName(allocator, "crtbegin.o", .only_dir);
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}
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fn findNativeKernel32LibDir(self: *LibCInstallation, allocator: *Allocator, sdk: *ZigWindowsSDK) FindError!void {
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var search_buf: [2]Search = undefined;
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const searches = fillSearch(&search_buf, sdk);
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var result_buf = try std.Buffer.initSize(allocator, 0);
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defer result_buf.deinit();
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const arch_sub_dir = switch (builtin.arch) {
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.i386 => "x86",
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.x86_64 => "x64",
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.arm, .armeb => "arm",
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else => return error.UnsupportedArchitecture,
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};
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for (searches) |search| {
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result_buf.shrink(0);
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const stream = &std.io.BufferOutStream.init(&result_buf).stream;
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try stream.print("{}\\Lib\\{}\\um\\{}", .{ search.path, search.version, arch_sub_dir });
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var dir = fs.cwd().openDirList(result_buf.toSliceConst()) catch |err| switch (err) {
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error.FileNotFound,
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error.NotDir,
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error.NoDevice,
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=> continue,
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else => return error.FileSystem,
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};
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defer dir.close();
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dir.accessZ("kernel32.lib", .{}) catch |err| switch (err) {
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error.FileNotFound => continue,
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else => return error.FileSystem,
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};
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self.kernel32_lib_dir = result_buf.toOwnedSlice();
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return;
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}
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return error.LibCKernel32LibNotFound;
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}
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};
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const default_cc_exe = if (is_windows) "cc.exe" else "cc";
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/// caller owns returned memory
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pub fn ccPrintFileName(
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allocator: *Allocator,
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o_file: []const u8,
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want_dirname: enum { full_path, only_dir },
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) ![:0]u8 {
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const cc_exe = std.os.getenvZ("CC") orelse default_cc_exe;
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const arg1 = try std.fmt.allocPrint(allocator, "-print-file-name={}", .{o_file});
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defer allocator.free(arg1);
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const argv = [_][]const u8{ cc_exe, arg1 };
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const max_bytes = 1024 * 1024;
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const exec_res = std.ChildProcess.exec(allocator, &argv, null, null, max_bytes) catch |err| switch (err) {
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error.OutOfMemory => return error.OutOfMemory,
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else => return error.UnableToSpawnCCompiler,
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};
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defer {
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allocator.free(exec_res.stdout);
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allocator.free(exec_res.stderr);
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}
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switch (exec_res.term) {
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.Exited => |code| if (code != 0) return error.CCompilerExitCode,
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else => return error.CCompilerCrashed,
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}
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var it = std.mem.tokenize(exec_res.stdout, "\n\r");
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const line = it.next() orelse return error.LibCRuntimeNotFound;
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switch (want_dirname) {
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.full_path => return std.mem.dupeZ(allocator, u8, line),
|
|
.only_dir => {
|
|
const dirname = fs.path.dirname(line) orelse return error.LibCRuntimeNotFound;
|
|
return std.mem.dupeZ(allocator, u8, dirname);
|
|
},
|
|
}
|
|
}
|
|
|
|
const Search = struct {
|
|
path: []const u8,
|
|
version: []const u8,
|
|
};
|
|
|
|
fn fillSearch(search_buf: *[2]Search, sdk: *ZigWindowsSDK) []Search {
|
|
var search_end: usize = 0;
|
|
if (sdk.path10_ptr) |path10_ptr| {
|
|
if (sdk.version10_ptr) |version10_ptr| {
|
|
search_buf[search_end] = Search{
|
|
.path = path10_ptr[0..sdk.path10_len],
|
|
.version = version10_ptr[0..sdk.version10_len],
|
|
};
|
|
search_end += 1;
|
|
}
|
|
}
|
|
if (sdk.path81_ptr) |path81_ptr| {
|
|
if (sdk.version81_ptr) |version81_ptr| {
|
|
search_buf[search_end] = Search{
|
|
.path = path81_ptr[0..sdk.path81_len],
|
|
.version = version81_ptr[0..sdk.version81_len],
|
|
};
|
|
search_end += 1;
|
|
}
|
|
}
|
|
return search_buf[0..search_end];
|
|
}
|