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Merge pull request #22659 from ifreund/linker-script-fix
link: fix ambiguous names in linker scripts
This commit is contained in:
Andrew Kelley
GitHub
commit
61b69a418d
2 changed files with 197 additions and 162 deletions
332
src/link.zig
332
src/link.zig
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@ -1891,145 +1891,185 @@ pub fn resolveInputs(
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mem.reverse(UnresolvedInput, unresolved_inputs.items);
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syslib: while (unresolved_inputs.pop()) |unresolved_input| {
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const name_query: UnresolvedInput.NameQuery = switch (unresolved_input) {
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.name_query => |nq| nq,
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.ambiguous_name => |an| an: {
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const lib_name, const link_mode = stripLibPrefixAndSuffix(an.name, target) orelse {
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try resolvePathInput(gpa, arena, unresolved_inputs, resolved_inputs, &ld_script_bytes, target, .{
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switch (unresolved_input) {
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.name_query => |name_query| {
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const query = name_query.query;
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// Checked in the first pass above while looking for libc libraries.
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assert(!fs.path.isAbsolute(name_query.name));
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checked_paths.clearRetainingCapacity();
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switch (query.search_strategy) {
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.mode_first, .no_fallback => {
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// check for preferred mode
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for (lib_directories) |lib_directory| switch (try resolveLibInput(
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gpa,
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arena,
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unresolved_inputs,
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resolved_inputs,
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&checked_paths,
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&ld_script_bytes,
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lib_directory,
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name_query,
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target,
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query.preferred_mode,
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color,
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)) {
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.ok => continue :syslib,
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.no_match => {},
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};
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// check for fallback mode
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if (query.search_strategy == .no_fallback) {
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try failed_libs.append(arena, .{
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.name = name_query.name,
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.strategy = query.search_strategy,
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.checked_paths = try arena.dupe(u8, checked_paths.items),
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.preferred_mode = query.preferred_mode,
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});
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continue :syslib;
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}
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for (lib_directories) |lib_directory| switch (try resolveLibInput(
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gpa,
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arena,
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unresolved_inputs,
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resolved_inputs,
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&checked_paths,
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&ld_script_bytes,
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lib_directory,
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name_query,
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target,
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query.fallbackMode(),
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color,
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)) {
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.ok => continue :syslib,
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.no_match => {},
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};
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try failed_libs.append(arena, .{
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.name = name_query.name,
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.strategy = query.search_strategy,
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.checked_paths = try arena.dupe(u8, checked_paths.items),
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.preferred_mode = query.preferred_mode,
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});
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continue :syslib;
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},
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.paths_first => {
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for (lib_directories) |lib_directory| {
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// check for preferred mode
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switch (try resolveLibInput(
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gpa,
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arena,
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unresolved_inputs,
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resolved_inputs,
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&checked_paths,
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&ld_script_bytes,
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lib_directory,
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name_query,
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target,
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query.preferred_mode,
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color,
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)) {
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.ok => continue :syslib,
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.no_match => {},
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}
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// check for fallback mode
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switch (try resolveLibInput(
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gpa,
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arena,
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unresolved_inputs,
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resolved_inputs,
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&checked_paths,
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&ld_script_bytes,
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lib_directory,
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name_query,
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target,
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query.fallbackMode(),
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color,
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)) {
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.ok => continue :syslib,
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.no_match => {},
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}
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}
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try failed_libs.append(arena, .{
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.name = name_query.name,
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.strategy = query.search_strategy,
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.checked_paths = try arena.dupe(u8, checked_paths.items),
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.preferred_mode = query.preferred_mode,
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});
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continue :syslib;
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},
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}
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},
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.ambiguous_name => |an| {
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// First check the path relative to the current working directory.
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// If the file is a library and is not found there, check the library search paths as well.
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// This is consistent with the behavior of GNU ld.
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if (try resolvePathInput(
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gpa,
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arena,
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unresolved_inputs,
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resolved_inputs,
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&ld_script_bytes,
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target,
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.{
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.path = Path.initCwd(an.name),
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.query = an.query,
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}, color);
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continue;
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};
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break :an .{
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.name = lib_name,
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.query = .{
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.needed = an.query.needed,
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.weak = an.query.weak,
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.reexport = an.query.reexport,
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.must_link = an.query.must_link,
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.hidden = an.query.hidden,
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.allow_so_scripts = an.query.allow_so_scripts,
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.preferred_mode = link_mode,
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.search_strategy = .no_fallback,
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},
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};
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color,
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)) |lib_result| {
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switch (lib_result) {
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.ok => continue :syslib,
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.no_match => {
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for (lib_directories) |lib_directory| {
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switch ((try resolvePathInput(
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gpa,
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arena,
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unresolved_inputs,
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resolved_inputs,
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&ld_script_bytes,
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target,
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.{
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.path = .{
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.root_dir = lib_directory,
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.sub_path = an.name,
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},
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.query = an.query,
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},
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color,
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)).?) {
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.ok => continue :syslib,
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.no_match => {},
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}
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}
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fatal("{s}: file listed in linker script not found", .{an.name});
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},
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}
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}
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continue;
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},
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.path_query => |pq| {
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try resolvePathInput(gpa, arena, unresolved_inputs, resolved_inputs, &ld_script_bytes, target, pq, color);
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if (try resolvePathInput(
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gpa,
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arena,
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unresolved_inputs,
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resolved_inputs,
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&ld_script_bytes,
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target,
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pq,
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color,
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)) |lib_result| {
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switch (lib_result) {
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.ok => {},
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.no_match => fatal("{}: file not found", .{pq.path}),
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}
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}
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continue;
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},
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.dso_exact => |dso_exact| {
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try resolved_inputs.append(gpa, .{ .dso_exact = dso_exact });
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continue;
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},
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};
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const query = name_query.query;
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// Checked in the first pass above while looking for libc libraries.
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assert(!fs.path.isAbsolute(name_query.name));
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checked_paths.clearRetainingCapacity();
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switch (query.search_strategy) {
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.mode_first, .no_fallback => {
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// check for preferred mode
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for (lib_directories) |lib_directory| switch (try resolveLibInput(
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gpa,
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arena,
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unresolved_inputs,
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resolved_inputs,
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&checked_paths,
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&ld_script_bytes,
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lib_directory,
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name_query,
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target,
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query.preferred_mode,
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color,
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)) {
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.ok => continue :syslib,
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.no_match => {},
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};
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// check for fallback mode
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if (query.search_strategy == .no_fallback) {
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try failed_libs.append(arena, .{
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.name = name_query.name,
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.strategy = query.search_strategy,
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.checked_paths = try arena.dupe(u8, checked_paths.items),
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.preferred_mode = query.preferred_mode,
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});
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continue :syslib;
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}
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for (lib_directories) |lib_directory| switch (try resolveLibInput(
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gpa,
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arena,
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unresolved_inputs,
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resolved_inputs,
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&checked_paths,
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&ld_script_bytes,
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lib_directory,
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name_query,
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target,
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query.fallbackMode(),
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color,
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)) {
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.ok => continue :syslib,
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.no_match => {},
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};
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try failed_libs.append(arena, .{
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.name = name_query.name,
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.strategy = query.search_strategy,
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.checked_paths = try arena.dupe(u8, checked_paths.items),
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.preferred_mode = query.preferred_mode,
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});
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continue :syslib;
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},
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.paths_first => {
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for (lib_directories) |lib_directory| {
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// check for preferred mode
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switch (try resolveLibInput(
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gpa,
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arena,
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unresolved_inputs,
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resolved_inputs,
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&checked_paths,
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&ld_script_bytes,
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lib_directory,
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name_query,
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target,
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query.preferred_mode,
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color,
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)) {
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.ok => continue :syslib,
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.no_match => {},
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}
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// check for fallback mode
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switch (try resolveLibInput(
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gpa,
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arena,
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unresolved_inputs,
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resolved_inputs,
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&checked_paths,
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&ld_script_bytes,
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lib_directory,
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name_query,
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target,
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query.fallbackMode(),
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color,
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)) {
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.ok => continue :syslib,
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.no_match => {},
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}
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}
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try failed_libs.append(arena, .{
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.name = name_query.name,
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.strategy = query.search_strategy,
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.checked_paths = try arena.dupe(u8, checked_paths.items),
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.preferred_mode = query.preferred_mode,
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});
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continue :syslib;
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},
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}
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@compileError("unreachable");
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}
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@ -2178,10 +2218,10 @@ fn resolvePathInput(
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target: std.Target,
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pq: UnresolvedInput.PathQuery,
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color: std.zig.Color,
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) Allocator.Error!void {
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switch (switch (Compilation.classifyFileExt(pq.path.sub_path)) {
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.static_library => try resolvePathInputLib(gpa, arena, unresolved_inputs, resolved_inputs, ld_script_bytes, target, pq, .static, color),
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.shared_library => try resolvePathInputLib(gpa, arena, unresolved_inputs, resolved_inputs, ld_script_bytes, target, pq, .dynamic, color),
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) Allocator.Error!?ResolveLibInputResult {
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switch (Compilation.classifyFileExt(pq.path.sub_path)) {
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.static_library => return try resolvePathInputLib(gpa, arena, unresolved_inputs, resolved_inputs, ld_script_bytes, target, pq, .static, color),
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.shared_library => return try resolvePathInputLib(gpa, arena, unresolved_inputs, resolved_inputs, ld_script_bytes, target, pq, .dynamic, color),
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.object => {
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var file = pq.path.root_dir.handle.openFile(pq.path.sub_path, .{}) catch |err|
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fatal("failed to open object {}: {s}", .{ pq.path, @errorName(err) });
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@ -2192,7 +2232,7 @@ fn resolvePathInput(
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.must_link = pq.query.must_link,
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.hidden = pq.query.hidden,
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} });
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return;
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return null;
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},
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.res => {
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var file = pq.path.root_dir.handle.openFile(pq.path.sub_path, .{}) catch |err|
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@ -2202,12 +2242,9 @@ fn resolvePathInput(
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.path = pq.path,
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.file = file,
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} });
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return;
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return null;
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},
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else => fatal("{}: unrecognized file extension", .{pq.path}),
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}) {
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.ok => {},
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.no_match => fatal("{}: file not found", .{pq.path}),
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}
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}
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@ -2228,9 +2265,11 @@ fn resolvePathInputLib(
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try resolved_inputs.ensureUnusedCapacity(gpa, 1);
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const test_path: Path = pq.path;
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// In the case of .so files, they might actually be "linker scripts"
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// In the case of shared libraries, they might actually be "linker scripts"
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// that contain references to other libraries.
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if (pq.query.allow_so_scripts and target.ofmt == .elf and mem.endsWith(u8, test_path.sub_path, ".so")) {
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if (pq.query.allow_so_scripts and target.ofmt == .elf and
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Compilation.classifyFileExt(test_path.sub_path) == .shared_library)
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{
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var file = test_path.root_dir.handle.openFile(test_path.sub_path, .{}) catch |err| switch (err) {
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error.FileNotFound => return .no_match,
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else => |e| fatal("unable to search for {s} library '{'}': {s}", .{
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@ -2356,21 +2395,6 @@ pub fn openDsoInput(diags: *Diags, path: Path, needed: bool, weak: bool, reexpor
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} };
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}
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fn stripLibPrefixAndSuffix(path: []const u8, target: std.Target) ?struct { []const u8, std.builtin.LinkMode } {
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const prefix = target.libPrefix();
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const static_suffix = target.staticLibSuffix();
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const dynamic_suffix = target.dynamicLibSuffix();
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const basename = fs.path.basename(path);
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const unlibbed = if (mem.startsWith(u8, basename, prefix)) basename[prefix.len..] else return null;
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if (mem.endsWith(u8, unlibbed, static_suffix)) return .{
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unlibbed[0 .. unlibbed.len - static_suffix.len], .static,
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};
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if (mem.endsWith(u8, unlibbed, dynamic_suffix)) return .{
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unlibbed[0 .. unlibbed.len - dynamic_suffix.len], .dynamic,
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};
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return null;
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}
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/// Returns true if and only if there is at least one input of type object,
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/// archive, or Windows resource file.
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pub fn anyObjectInputs(inputs: []const Input) bool {
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@ -2123,24 +2123,35 @@ fn testLinkOrder(b: *Build, opts: Options) *Step {
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fn testLdScript(b: *Build, opts: Options) *Step {
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const test_step = addTestStep(b, "ld-script", opts);
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const dso = addSharedLibrary(b, opts, .{ .name = "bar" });
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addCSourceBytes(dso, "int foo() { return 42; }", &.{});
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const bar = addSharedLibrary(b, opts, .{ .name = "bar" });
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addCSourceBytes(bar, "int bar() { return 42; }", &.{});
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const baz = addSharedLibrary(b, opts, .{ .name = "baz" });
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addCSourceBytes(baz, "int baz() { return 42; }", &.{});
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const scripts = WriteFile.create(b);
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_ = scripts.add("liba.so", "INPUT(libfoo.so)");
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_ = scripts.add("liba.so", "INPUT(libfoo.so libfoo2.so.1)");
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_ = scripts.add("libfoo.so", "GROUP(AS_NEEDED(-lbar))");
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// Check finding a versioned .so file that is elsewhere in the library search paths.
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const scripts2 = WriteFile.create(b);
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_ = scripts2.add("libfoo2.so.1", "GROUP(AS_NEEDED(-lbaz))");
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const exe = addExecutable(b, opts, .{ .name = "main" });
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addCSourceBytes(exe,
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\\int foo();
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\\int bar();
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\\int baz();
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\\int main() {
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\\ return foo() - 42;
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\\ return bar() - baz();
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\\}
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, &.{});
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exe.linkSystemLibrary2("a", .{});
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exe.addLibraryPath(scripts.getDirectory());
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exe.addLibraryPath(dso.getEmittedBinDirectory());
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exe.addRPath(dso.getEmittedBinDirectory());
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exe.addLibraryPath(scripts2.getDirectory());
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exe.addLibraryPath(bar.getEmittedBinDirectory());
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exe.addLibraryPath(baz.getEmittedBinDirectory());
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exe.addRPath(bar.getEmittedBinDirectory());
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exe.addRPath(baz.getEmittedBinDirectory());
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exe.linkLibC();
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exe.allow_so_scripts = true;
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@ -2167,7 +2178,7 @@ fn testLdScriptPathError(b: *Build, opts: Options) *Step {
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// TODO: A future enhancement could make this error message also mention
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// the file that references the missing library.
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expectLinkErrors(exe, test_step, .{
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.stderr_contains = "error: unable to find dynamic system library 'foo' using strategy 'no_fallback'. searched paths:",
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.stderr_contains = "error: libfoo.so: file listed in linker script not found",
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});
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return test_step;
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