pub fn detect(
arena: Allocator,
io: Io,
native_target: *const std.Target,
environ_map: *const process.Environ.Map,
) !NativePaths {
var self: NativePaths = .{ .arena = arena };
var is_nix = false;
if (std.zig.EnvVar.NIX_CFLAGS_COMPILE.get(environ_map)) |nix_cflags_compile| {
is_nix = true;
var it = mem.tokenizeScalar(u8, nix_cflags_compile, ' ');
while (true) {
const word = it.next() orelse break;
if (mem.eql(u8, word, "-isystem") or mem.eql(u8, word, "-idirafter")) {
const include_path = it.next() orelse {
try self.addWarningFmt("Expected argument after {s} in NIX_CFLAGS_COMPILE", .{word});
break;
};
try self.addIncludeDir(include_path);
} else if (mem.eql(u8, word, "-iframework")) {
const framework_path = it.next() orelse {
try self.addWarning("Expected argument after -iframework in NIX_CFLAGS_COMPILE");
break;
};
try self.addFrameworkDir(framework_path);
} else if (mem.startsWith(u8, word, "-frandom-seed=") or
mem.startsWith(u8, word, "-fmacro-prefix-map="))
{
// Ignore this argument.
} else {
try self.addWarningFmt("Unrecognized C flag from NIX_CFLAGS_COMPILE: {s}", .{word});
}
}
}
if (std.zig.EnvVar.NIX_LDFLAGS.get(environ_map)) |nix_ldflags| {
is_nix = true;
var it = mem.tokenizeScalar(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 (mem.eql(u8, word, "-L") or mem.eql(u8, word, "-l")) {
_ = it.next() orelse {
try self.addWarning("Expected argument after -L or -l in NIX_LDFLAGS");
break;
};
} else if (mem.startsWith(u8, word, "-L")) {
const lib_path = word[2..];
try self.addLibDir(lib_path);
try self.addRPath(lib_path);
} else if (mem.startsWith(u8, word, "-l") or mem.startsWith(u8, word, "-static")) {
// Ignore this argument.
} else {
try self.addWarningFmt("Unrecognized C flag from NIX_LDFLAGS: {s}", .{word});
break;
}
}
}
if (std.zig.EnvVar.NIX_CFLAGS_LINK.get(environ_map)) |nix_cflags_link| {
is_nix = true;
var it = mem.tokenizeScalar(u8, nix_cflags_link, ' ');
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_CFLAGS_LINK");
break;
};
try self.addRPath(rpath);
} else if (mem.eql(u8, word, "-L") or mem.eql(u8, word, "-l")) {
_ = it.next() orelse {
try self.addWarning("Expected argument after -L or -l in NIX_CFLAGS_LINK");
break;
};
} else if (mem.startsWith(u8, word, "-L")) {
const lib_path = word[2..];
try self.addLibDir(lib_path);
try self.addRPath(lib_path);
} else if (mem.startsWith(u8, word, "-l") or mem.startsWith(u8, word, "-static")) {
// Ignore this argument.
} else {
try self.addWarningFmt("Unrecognized C flag from NIX_CFLAGS_LINK: {s}", .{word});
break;
}
}
}
if (is_nix) {
return self;
}
// TODO: consider also adding macports paths
if (builtin.target.os.tag.isDarwin()) {
if (std.zig.system.darwin.isSdkInstalled(arena, io)) sdk: {
const sdk = std.zig.system.darwin.getSdk(arena, io, native_target) orelse break :sdk;
try self.addLibDir(try std.fs.path.join(arena, &.{ sdk, "usr/lib" }));
try self.addFrameworkDir(try std.fs.path.join(arena, &.{ sdk, "System/Library/Frameworks" }));
try self.addIncludeDir(try std.fs.path.join(arena, &.{ sdk, "usr/include" }));
}
// Check for homebrew paths
if (std.zig.EnvVar.HOMEBREW_PREFIX.get(environ_map)) |prefix| {
try self.addLibDir(try std.fs.path.join(arena, &.{ prefix, "/lib" }));
try self.addIncludeDir(try std.fs.path.join(arena, &.{ prefix, "/include" }));
}
return self;
}
if (builtin.os.tag == .illumos) {
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 (builtin.os.tag == .haiku) {
try self.addLibDir("/system/non-packaged/lib");
try self.addLibDir("/system/develop/lib");
try self.addLibDir("/system/lib");
return self;
}
if (builtin.os.tag != .windows and builtin.os.tag != .wasi) {
const triple = try std.zig.target.linuxTriple(arena, native_target);
const qual = native_target.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});
// Distros like guix don't use FHS, so they rely on environment
// variables to search for headers and libraries.
if (std.zig.EnvVar.C_INCLUDE_PATH.get(environ_map)) |c_include_path| {
var it = mem.tokenizeScalar(u8, c_include_path, ':');
while (it.next()) |dir| {
try self.addIncludeDir(dir);
}
}
if (std.zig.EnvVar.CPLUS_INCLUDE_PATH.get(environ_map)) |cplus_include_path| {
var it = mem.tokenizeScalar(u8, cplus_include_path, ':');
while (it.next()) |dir| {
try self.addIncludeDir(dir);
}
}
if (std.zig.EnvVar.LIBRARY_PATH.get(environ_map)) |library_path| {
var it = mem.tokenizeScalar(u8, library_path, ':');
while (it.next()) |dir| {
try self.addLibDir(dir);
}
}
}
return self;
}
