std, stage1: make shared library versioning optional

This commit changes the behavior of stage1 to emit libfoo.so instead
of libfoo.so.0.0.0 when none of the --ver-major, --ver-minor, or
--ver-patch flags ar set.

It also makes it possible to create unversioned shared libraries
using the zig build system, changing the version parameter of
addSharedLibrary() to a tagged union.

Author: ifreund

lib/std/build.zig

@@ -258,9 +258,15 @@ pub const Builder = struct {
         }));
     }
 
-    pub fn addSharedLibrary(self: *Builder, name: []const u8, root_src: ?[]const u8, ver: Version) *LibExeObjStep {
+    pub fn addSharedLibrary(self: *Builder, name: []const u8, root_src: ?[]const u8, kind: union(enum) {
+        versioned: Version,
+        unversioned: void,
+    }) *LibExeObjStep {
         const root_src_param = if (root_src) |p| @as(FileSource, .{ .path = p }) else null;
-        return LibExeObjStep.createSharedLibrary(self, name, root_src_param, ver);
+        return LibExeObjStep.createSharedLibrary(self, name, root_src_param, switch (kind) {
+            .versioned => |ver| ver,
+            .unversioned => null,
+        });
     }
 
     pub fn addStaticLibrary(self: *Builder, name: []const u8, root_src: ?[]const u8) *LibExeObjStep {
@@ -1166,7 +1172,7 @@ pub const LibExeObjStep = struct {
     version_script: ?[]const u8 = null,
     out_filename: []const u8,
     is_dynamic: bool,
-    version: Version,
+    version: ?Version,
     build_mode: builtin.Mode,
     kind: Kind,
     major_only_filename: []const u8,
@@ -1268,33 +1274,33 @@ pub const LibExeObjStep = struct {
         Test,
     };
 
-    pub fn createSharedLibrary(builder: *Builder, name: []const u8, root_src: ?FileSource, ver: Version) *LibExeObjStep {
+    pub fn createSharedLibrary(builder: *Builder, name: []const u8, root_src: ?FileSource, ver: ?Version) *LibExeObjStep {
         const self = builder.allocator.create(LibExeObjStep) catch unreachable;
         self.* = initExtraArgs(builder, name, root_src, Kind.Lib, true, ver);
         return self;
     }
 
     pub fn createStaticLibrary(builder: *Builder, name: []const u8, root_src: ?FileSource) *LibExeObjStep {
         const self = builder.allocator.create(LibExeObjStep) catch unreachable;
-        self.* = initExtraArgs(builder, name, root_src, Kind.Lib, false, builder.version(0, 0, 0));
+        self.* = initExtraArgs(builder, name, root_src, Kind.Lib, false, null);
         return self;
     }
 
     pub fn createObject(builder: *Builder, name: []const u8, root_src: ?FileSource) *LibExeObjStep {
         const self = builder.allocator.create(LibExeObjStep) catch unreachable;
-        self.* = initExtraArgs(builder, name, root_src, Kind.Obj, false, builder.version(0, 0, 0));
+        self.* = initExtraArgs(builder, name, root_src, Kind.Obj, false, null);
         return self;
     }
 
     pub fn createExecutable(builder: *Builder, name: []const u8, root_src: ?FileSource, is_dynamic: bool) *LibExeObjStep {
         const self = builder.allocator.create(LibExeObjStep) catch unreachable;
-        self.* = initExtraArgs(builder, name, root_src, Kind.Exe, is_dynamic, builder.version(0, 0, 0));
+        self.* = initExtraArgs(builder, name, root_src, Kind.Exe, is_dynamic, null);
         return self;
     }
 
     pub fn createTest(builder: *Builder, name: []const u8, root_src: FileSource) *LibExeObjStep {
         const self = builder.allocator.create(LibExeObjStep) catch unreachable;
-        self.* = initExtraArgs(builder, name, root_src, Kind.Test, false, builder.version(0, 0, 0));
+        self.* = initExtraArgs(builder, name, root_src, Kind.Test, false, null);
         return self;
     }
 
@@ -1304,7 +1310,7 @@ pub const LibExeObjStep = struct {
         root_src: ?FileSource,
         kind: Kind,
         is_dynamic: bool,
-        ver: Version,
+        ver: ?Version,
     ) LibExeObjStep {
         if (mem.indexOf(u8, name, "/") != null or mem.indexOf(u8, name, "\\") != null) {
             panic("invalid name: '{}'. It looks like a file path, but it is supposed to be the library or application name.", .{name});
@@ -1375,17 +1381,17 @@ pub const LibExeObjStep = struct {
                         self.target.staticLibSuffix(),
                     });
                     self.out_lib_filename = self.out_filename;
-                } else {
+                } else if (self.version) |version| {
                     if (self.target.isDarwin()) {
                         self.out_filename = self.builder.fmt("lib{}.{d}.{d}.{d}.dylib", .{
                             self.name,
-                            self.version.major,
-                            self.version.minor,
-                            self.version.patch,
+                            version.major,
+                            version.minor,
+                            version.patch,
                         });
                         self.major_only_filename = self.builder.fmt("lib{}.{d}.dylib", .{
                             self.name,
-                            self.version.major,
+                            version.major,
                         });
                         self.name_only_filename = self.builder.fmt("lib{}.dylib", .{self.name});
                         self.out_lib_filename = self.out_filename;
@@ -1395,14 +1401,25 @@ pub const LibExeObjStep = struct {
                     } else {
                         self.out_filename = self.builder.fmt("lib{}.so.{d}.{d}.{d}", .{
                             self.name,
-                            self.version.major,
-                            self.version.minor,
-                            self.version.patch,
+                            version.major,
+                            version.minor,
+                            version.patch,
                         });
-                        self.major_only_filename = self.builder.fmt("lib{}.so.{d}", .{ self.name, self.version.major });
+                        self.major_only_filename = self.builder.fmt("lib{}.so.{d}", .{ self.name, version.major });
                         self.name_only_filename = self.builder.fmt("lib{}.so", .{self.name});
                         self.out_lib_filename = self.out_filename;
                     }
+                } else {
+                    if (self.target.isDarwin()) {
+                        self.out_filename = self.builder.fmt("lib{}.dylib", .{self.name});
+                        self.out_lib_filename = self.out_filename;
+                    } else if (self.target.isWindows()) {
+                        self.out_filename = self.builder.fmt("{}.dll", .{self.name});
+                        self.out_lib_filename = self.builder.fmt("{}.lib", .{self.name});
+                    } else {
+                        self.out_filename = self.builder.fmt("lib{}.so", .{self.name});
+                        self.out_lib_filename = self.out_filename;
+                    }
                 }
             },
         }
@@ -2037,14 +2054,16 @@ pub const LibExeObjStep = struct {
         zig_args.append(self.name) catch unreachable;
 
         if (self.kind == Kind.Lib and self.is_dynamic) {
-            zig_args.append("--ver-major") catch unreachable;
-            zig_args.append(builder.fmt("{}", .{self.version.major})) catch unreachable;
+            if (self.version) |version| {
+                zig_args.append("--ver-major") catch unreachable;
+                zig_args.append(builder.fmt("{}", .{version.major})) catch unreachable;
 
-            zig_args.append("--ver-minor") catch unreachable;
-            zig_args.append(builder.fmt("{}", .{self.version.minor})) catch unreachable;
+                zig_args.append("--ver-minor") catch unreachable;
+                zig_args.append(builder.fmt("{}", .{version.minor})) catch unreachable;
 
-            zig_args.append("--ver-patch") catch unreachable;
-            zig_args.append(builder.fmt("{}", .{self.version.patch})) catch unreachable;
+                zig_args.append("--ver-patch") catch unreachable;
+                zig_args.append(builder.fmt("{}", .{version.patch})) catch unreachable;
+            }
         }
         if (self.is_dynamic) {
             try zig_args.append("-dynamic");
@@ -2285,7 +2304,7 @@ pub const LibExeObjStep = struct {
             }
         }
 
-        if (self.kind == Kind.Lib and self.is_dynamic and self.target.wantSharedLibSymLinks()) {
+        if (self.kind == Kind.Lib and self.is_dynamic and self.version != null and self.target.wantSharedLibSymLinks()) {
             try doAtomicSymLinks(builder.allocator, self.getOutputPath(), self.major_only_filename, self.name_only_filename);
         }
     }
@@ -2329,8 +2348,10 @@ pub const InstallArtifactStep = struct {
 
         builder.pushInstalledFile(self.dest_dir, artifact.out_filename);
         if (self.artifact.isDynamicLibrary()) {
-            builder.pushInstalledFile(.Lib, artifact.major_only_filename);
-            builder.pushInstalledFile(.Lib, artifact.name_only_filename);
+            if (self.artifact.version != null) {
+                builder.pushInstalledFile(.Lib, artifact.major_only_filename);
+                builder.pushInstalledFile(.Lib, artifact.name_only_filename);
+            }
             if (self.artifact.target.isWindows()) {
                 builder.pushInstalledFile(.Lib, artifact.out_lib_filename);
             }
@@ -2350,7 +2371,7 @@ pub const InstallArtifactStep = struct {
 
         const full_dest_path = builder.getInstallPath(self.dest_dir, self.artifact.out_filename);
         try builder.updateFile(self.artifact.getOutputPath(), full_dest_path);
-        if (self.artifact.isDynamicLibrary() and self.artifact.target.wantSharedLibSymLinks()) {
+        if (self.artifact.isDynamicLibrary() and self.artifact.version != null and self.artifact.target.wantSharedLibSymLinks()) {
             try doAtomicSymLinks(builder.allocator, full_dest_path, self.artifact.major_only_filename, self.artifact.name_only_filename);
         }
         if (self.pdb_dir) |pdb_dir| {

src/all_types.hpp

@@ -2265,6 +2265,7 @@ struct CodeGen {
 
     Stage2LibCInstallation *libc;
 
+    bool is_versioned;
     size_t version_major;
     size_t version_minor;
     size_t version_patch;

src/codegen.cpp

@@ -90,7 +90,8 @@ void codegen_set_test_name_prefix(CodeGen *g, Buf *prefix) {
     g->test_name_prefix = prefix;
 }
 
-void codegen_set_lib_version(CodeGen *g, size_t major, size_t minor, size_t patch) {
+void codegen_set_lib_version(CodeGen *g, bool is_versioned, size_t major, size_t minor, size_t patch) {
+    g->is_versioned = is_versioned;
     g->version_major = major;
     g->version_minor = minor;
     g->version_patch = patch;
@@ -10823,6 +10824,7 @@ static Error check_cache(CodeGen *g, Buf *manifest_dir, Buf *digest) {
     cache_bool(ch, g->emit_bin);
     cache_bool(ch, g->emit_llvm_ir);
     cache_bool(ch, g->emit_asm);
+    cache_bool(ch, g->is_versioned);
     cache_usize(ch, g->version_major);
     cache_usize(ch, g->version_minor);
     cache_usize(ch, g->version_patch);
@@ -10893,7 +10895,7 @@ static void resolve_out_paths(CodeGen *g) {
                 buf_resize(out_basename, 0);
                 buf_append_str(out_basename, target_lib_file_prefix(g->zig_target));
                 buf_append_buf(out_basename, g->root_out_name);
-                buf_append_str(out_basename, target_lib_file_ext(g->zig_target, !g->is_dynamic,
+                buf_append_str(out_basename, target_lib_file_ext(g->zig_target, !g->is_dynamic, g->is_versioned,
                             g->version_major, g->version_minor, g->version_patch));
                 break;
         }

src/codegen.hpp

@@ -38,7 +38,7 @@ void codegen_set_rdynamic(CodeGen *g, bool rdynamic);
 void codegen_set_linker_script(CodeGen *g, const char *linker_script);
 void codegen_set_test_filter(CodeGen *g, Buf *filter);
 void codegen_set_test_name_prefix(CodeGen *g, Buf *prefix);
-void codegen_set_lib_version(CodeGen *g, size_t major, size_t minor, size_t patch);
+void codegen_set_lib_version(CodeGen *g, bool is_versioned, size_t major, size_t minor, size_t patch);
 void codegen_add_time_event(CodeGen *g, const char *name);
 void codegen_print_timing_report(CodeGen *g, FILE *f);
 void codegen_link(CodeGen *g);

src/glibc.cpp

@@ -335,7 +335,7 @@ Error glibc_build_dummies_and_maps(CodeGen *g, const ZigGLibCAbi *glibc_abi, con
         bool is_ld = (strcmp(lib->name, "ld") == 0);
 
         CodeGen *child_gen = create_child_codegen(g, zig_file_path, OutTypeLib, nullptr, lib->name, progress_node);
-        codegen_set_lib_version(child_gen, lib->sover, 0, 0);
+        codegen_set_lib_version(child_gen, true, lib->sover, 0, 0);
         child_gen->is_dynamic = true;
         child_gen->is_dummy_so = true;
         child_gen->version_script_path = map_file_path;

src/main.cpp

@@ -416,6 +416,7 @@ static int main0(int argc, char **argv) {
     const char *test_filter = nullptr;
     const char *test_name_prefix = nullptr;
     bool test_evented_io = false;
+    bool is_versioned = false;
     size_t ver_major = 0;
     size_t ver_minor = 0;
     size_t ver_patch = 0;
@@ -870,13 +871,15 @@ static int main0(int argc, char **argv) {
                     fprintf(stderr, "expected linker arg after '%s'\n", buf_ptr(arg));
                     return EXIT_FAILURE;
                 }
+                is_versioned = true;
                 ver_major = atoi(buf_ptr(linker_args.at(i)));
             } else if (buf_eql_str(arg, "--minor-image-version")) {
                 i += 1;
                 if (i >= linker_args.length) {
                     fprintf(stderr, "expected linker arg after '%s'\n", buf_ptr(arg));
                     return EXIT_FAILURE;
                 }
+                is_versioned = true;
                 ver_minor = atoi(buf_ptr(linker_args.at(i)));
             } else if (buf_eql_str(arg, "--stack")) {
                 i += 1;
@@ -1228,10 +1231,13 @@ static int main0(int argc, char **argv) {
                 } else if (strcmp(arg, "--test-name-prefix") == 0) {
                     test_name_prefix = argv[i];
                 } else if (strcmp(arg, "--ver-major") == 0) {
+                    is_versioned = true;
                     ver_major = atoi(argv[i]);
                 } else if (strcmp(arg, "--ver-minor") == 0) {
+                    is_versioned = true;
                     ver_minor = atoi(argv[i]);
                 } else if (strcmp(arg, "--ver-patch") == 0) {
+                    is_versioned = true;
                     ver_patch = atoi(argv[i]);
                 } else if (strcmp(arg, "--test-cmd") == 0) {
                     test_exec_args.append(argv[i]);
@@ -1590,7 +1596,7 @@ static int main0(int argc, char **argv) {
             g->emit_llvm_ir = emit_llvm_ir;
 
             codegen_set_out_name(g, buf_out_name);
-            codegen_set_lib_version(g, ver_major, ver_minor, ver_patch);
+            codegen_set_lib_version(g, is_versioned, ver_major, ver_minor, ver_patch);
             g->want_single_threaded = want_single_threaded;
             codegen_set_linker_script(g, linker_script);
             g->version_script_path = version_script; 

src/target.cpp

@@ -779,7 +779,7 @@ const char *target_lib_file_prefix(const ZigTarget *target) {
     }
 }
 
-const char *target_lib_file_ext(const ZigTarget *target, bool is_static,
+const char *target_lib_file_ext(const ZigTarget *target, bool is_static, bool is_versioned,
         size_t version_major, size_t version_minor, size_t version_patch)
 {
     if (target_is_wasm(target)) {
@@ -799,11 +799,17 @@ const char *target_lib_file_ext(const ZigTarget *target, bool is_static,
         if (is_static) {
             return ".a";
         } else if (target_os_is_darwin(target->os)) {
-            return buf_ptr(buf_sprintf(".%" ZIG_PRI_usize ".%" ZIG_PRI_usize ".%" ZIG_PRI_usize ".dylib",
-                        version_major, version_minor, version_patch));
-        } else {
+            if (is_versioned) {
+                return buf_ptr(buf_sprintf(".%" ZIG_PRI_usize ".%" ZIG_PRI_usize ".%" ZIG_PRI_usize ".dylib",
+                            version_major, version_minor, version_patch));
+            } else {
+                return ".dylib";
+            }
+        } else if (is_versioned) {
             return buf_ptr(buf_sprintf(".so.%" ZIG_PRI_usize ".%" ZIG_PRI_usize ".%" ZIG_PRI_usize,
                         version_major, version_minor, version_patch));
+        } else {
+            return ".so";
         }
     }
 }

src/target.hpp

@@ -87,7 +87,7 @@ const char *target_asm_file_ext(const ZigTarget *target);
 const char *target_llvm_ir_file_ext(const ZigTarget *target);
 const char *target_exe_file_ext(const ZigTarget *target);
 const char *target_lib_file_prefix(const ZigTarget *target);
-const char *target_lib_file_ext(const ZigTarget *target, bool is_static,
+const char *target_lib_file_ext(const ZigTarget *target, bool is_static, bool is_versioned,
         size_t version_major, size_t version_minor, size_t version_patch);
 
 bool target_can_exec(const ZigTarget *host_target, const ZigTarget *guest_target);