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NativePaths.zig
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NativePaths.zig
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const std = @import("../../std.zig");
const builtin = @import("builtin");
const ArrayList = std.ArrayList;
const Allocator = std.mem.Allocator;
const process = std.process;
const mem = std.mem;
const NativePaths = @This();
const NativeTargetInfo = std.zig.system.NativeTargetInfo;
include_dirs: ArrayList([:0]u8),
lib_dirs: ArrayList([:0]u8),
framework_dirs: ArrayList([:0]u8),
rpaths: ArrayList([:0]u8),
warnings: ArrayList([:0]u8),
pub fn detect(allocator: Allocator, native_info: NativeTargetInfo) !NativePaths {
const native_target = native_info.target;
var self: NativePaths = .{
.include_dirs = ArrayList([:0]u8).init(allocator),
.lib_dirs = ArrayList([:0]u8).init(allocator),
.framework_dirs = ArrayList([:0]u8).init(allocator),
.rpaths = ArrayList([:0]u8).init(allocator),
.warnings = ArrayList([:0]u8).init(allocator),
};
errdefer self.deinit();
var is_nix = false;
if (process.getEnvVarOwned(allocator, "NIX_CFLAGS_COMPILE")) |nix_cflags_compile| {
defer allocator.free(nix_cflags_compile);
is_nix = true;
var it = mem.tokenize(u8, nix_cflags_compile, " ");
while (true) {
const word = it.next() orelse break;
if (mem.eql(u8, word, "-isystem")) {
const include_path = it.next() orelse {
try self.addWarning("Expected argument after -isystem in NIX_CFLAGS_COMPILE");
break;
};
try self.addIncludeDir(include_path);
} else {
if (mem.startsWith(u8, word, "-frandom-seed=")) {
continue;
}
try self.addWarningFmt("Unrecognized C flag from NIX_CFLAGS_COMPILE: {s}", .{word});
}
}
} else |err| switch (err) {
error.InvalidUtf8 => {},
error.EnvironmentVariableNotFound => {},
error.OutOfMemory => |e| return e,
}
if (process.getEnvVarOwned(allocator, "NIX_LDFLAGS")) |nix_ldflags| {
defer allocator.free(nix_ldflags);
is_nix = true;
var it = mem.tokenize(u8, nix_ldflags, " ");
while (true) {
const word = it.next() orelse break;
if (mem.eql(u8, word, "-rpath")) {
const rpath = it.next() orelse {
try self.addWarning("Expected argument after -rpath in NIX_LDFLAGS");
break;
};
try self.addRPath(rpath);
} else if (word.len > 2 and word[0] == '-' and word[1] == 'L') {
const lib_path = word[2..];
try self.addLibDir(lib_path);
} else {
try self.addWarningFmt("Unrecognized C flag from NIX_LDFLAGS: {s}", .{word});
break;
}
}
} else |err| switch (err) {
error.InvalidUtf8 => {},
error.EnvironmentVariableNotFound => {},
error.OutOfMemory => |e| return e,
}
if (is_nix) {
return self;
}
if (comptime builtin.target.isDarwin()) {
try self.addIncludeDir("/usr/include");
try self.addLibDir("/usr/lib");
try self.addFrameworkDir("/System/Library/Frameworks");
if (builtin.target.os.version_range.semver.min.major < 11) {
try self.addIncludeDir("/usr/local/include");
try self.addLibDir("/usr/local/lib");
try self.addFrameworkDir("/Library/Frameworks");
}
return self;
}
if (comptime native_target.os.tag == .solaris) {
try self.addLibDir("/usr/lib/64");
try self.addLibDir("/usr/local/lib/64");
try self.addLibDir("/lib/64");
try self.addIncludeDir("/usr/include");
try self.addIncludeDir("/usr/local/include");
return self;
}
if (native_target.os.tag != .windows) {
const triple = try native_target.linuxTriple(allocator);
defer allocator.free(triple);
const qual = native_target.cpu.arch.ptrBitWidth();
// TODO: $ ld --verbose | grep SEARCH_DIR
// the output contains some paths that end with lib64, maybe include them too?
// TODO: what is the best possible order of things?
// TODO: some of these are suspect and should only be added on some systems. audit needed.
try self.addIncludeDir("/usr/local/include");
try self.addLibDirFmt("/usr/local/lib{d}", .{qual});
try self.addLibDir("/usr/local/lib");
try self.addIncludeDirFmt("/usr/include/{s}", .{triple});
try self.addLibDirFmt("/usr/lib/{s}", .{triple});
try self.addIncludeDir("/usr/include");
try self.addLibDirFmt("/lib{d}", .{qual});
try self.addLibDir("/lib");
try self.addLibDirFmt("/usr/lib{d}", .{qual});
try self.addLibDir("/usr/lib");
// example: on a 64-bit debian-based linux distro, with zlib installed from apt:
// zlib.h is in /usr/include (added above)
// libz.so.1 is in /lib/x86_64-linux-gnu (added here)
try self.addLibDirFmt("/lib/{s}", .{triple});
// NOTE: distro like guix doesn't use FHS, so it relies on envorinment
// variables (C_INCLUDE_PATH, CPLUS_INCLUDE_PATH and LIBRARY_PATH) to
// search for headers and libraries
if (process.getEnvVarOwned(allocator, "C_INCLUDE_PATH")) |c_include_path| {
defer allocator.free(c_include_path);
var it = mem.tokenize(u8, c_include_path, ":");
while (true) {
const dir = it.next() orelse break;
try self.addIncludeDir(dir);
}
} else |err| switch (err) {
error.InvalidUtf8 => {},
error.EnvironmentVariableNotFound => {},
error.OutOfMemory => |e| return e,
}
if (process.getEnvVarOwned(allocator, "CPLUS_INCLUDE_PATH")) |cplus_include_path| {
defer allocator.free(cplus_include_path);
var it = mem.tokenize(u8, cplus_include_path, ":");
while (true) {
const dir = it.next() orelse break;
try self.addIncludeDir(dir);
}
} else |err| switch (err) {
error.InvalidUtf8 => {},
error.EnvironmentVariableNotFound => {},
error.OutOfMemory => |e| return e,
}
if (process.getEnvVarOwned(allocator, "LIBRARY_PATH")) |library_path| {
defer allocator.free(library_path);
var it = mem.tokenize(u8, library_path, ":");
while (true) {
const dir = it.next() orelse break;
try self.addLibDir(dir);
}
} else |err| switch (err) {
error.InvalidUtf8 => {},
error.EnvironmentVariableNotFound => {},
error.OutOfMemory => |e| return e,
}
}
return self;
}
pub fn deinit(self: *NativePaths) void {
deinitArray(&self.include_dirs);
deinitArray(&self.lib_dirs);
deinitArray(&self.framework_dirs);
deinitArray(&self.rpaths);
deinitArray(&self.warnings);
self.* = undefined;
}
fn deinitArray(array: *ArrayList([:0]u8)) void {
for (array.items) |item| {
array.allocator.free(item);
}
array.deinit();
}
pub fn addIncludeDir(self: *NativePaths, s: []const u8) !void {
return self.appendArray(&self.include_dirs, s);
}
pub fn addIncludeDirFmt(self: *NativePaths, comptime fmt: []const u8, args: anytype) !void {
const item = try std.fmt.allocPrintZ(self.include_dirs.allocator, fmt, args);
errdefer self.include_dirs.allocator.free(item);
try self.include_dirs.append(item);
}
pub fn addLibDir(self: *NativePaths, s: []const u8) !void {
return self.appendArray(&self.lib_dirs, s);
}
pub fn addLibDirFmt(self: *NativePaths, comptime fmt: []const u8, args: anytype) !void {
const item = try std.fmt.allocPrintZ(self.lib_dirs.allocator, fmt, args);
errdefer self.lib_dirs.allocator.free(item);
try self.lib_dirs.append(item);
}
pub fn addWarning(self: *NativePaths, s: []const u8) !void {
return self.appendArray(&self.warnings, s);
}
pub fn addFrameworkDir(self: *NativePaths, s: []const u8) !void {
return self.appendArray(&self.framework_dirs, s);
}
pub fn addFrameworkDirFmt(self: *NativePaths, comptime fmt: []const u8, args: anytype) !void {
const item = try std.fmt.allocPrintZ(self.framework_dirs.allocator, fmt, args);
errdefer self.framework_dirs.allocator.free(item);
try self.framework_dirs.append(item);
}
pub fn addWarningFmt(self: *NativePaths, comptime fmt: []const u8, args: anytype) !void {
const item = try std.fmt.allocPrintZ(self.warnings.allocator, fmt, args);
errdefer self.warnings.allocator.free(item);
try self.warnings.append(item);
}
pub fn addRPath(self: *NativePaths, s: []const u8) !void {
return self.appendArray(&self.rpaths, s);
}
fn appendArray(self: *NativePaths, array: *ArrayList([:0]u8), s: []const u8) !void {
_ = self;
const item = try array.allocator.dupeZ(u8, s);
errdefer array.allocator.free(item);
try array.append(item);
}