auto merge of #9151 : catamorphism/rust/rustpkg-target-specific-subdirectory, r=brson

r? @brson As per rustpkg.md, rustpkg now builds in a target-specific
subdirectory of build/, and installs libraries into a target-specific
subdirectory of lib.

Closes #8672

doc/rustpkg.md

@@ -52,13 +52,11 @@ A valid workspace must contain each of the following subdirectories:
      rustpkg will install libraries for bar to `foo/lib/x86_64-apple-darwin/`.
      The libraries will have names of the form `foo/lib/x86_64-apple-darwin/libbar-[hash].dylib`,
      where [hash] is a hash of the package ID.
-* 'bin/': `rustpkg install` installs executable binaries into a target-specific subdirectory of this directory.
+* 'bin/': `rustpkg install` installs executable binaries into this directory.
 
-     For example, on a 64-bit machine running Mac OS X,
-     if `foo` is a workspace, containing the package `bar`,
-     rustpkg will install executables for `bar` to
-     `foo/bin/x86_64-apple-darwin/`.
-     The executables will have names of the form `foo/bin/x86_64-apple-darwin/bar`.
+     For example, rustpkg will install executables for `bar` to
+     `foo/bin`.
+     The executables will have names of the form `foo/bin/bar`.
 * 'build/': `rustpkg build` stores temporary build artifacts in a target-specific subdirectory of this directory.
 
      For example, on a 64-bit machine running Mac OS X,
@@ -85,6 +83,12 @@ rustpkg also interprets any dependencies on such a package ID literally
 Thus, `github.com/mozilla/rust#5c4cd30f80` is also a valid package ID,
 since git can deduce that 5c4cd30f80 refers to a revision of the desired repository.
 
+A package identifier can name a subdirectory of another package.
+For example, if `foo` is a workspace, and `foo/src/bar/lib.rs` exists,
+as well as `foo/src/bar/extras/baz/lib.rs`,
+then both `bar` and `bar/extras/baz` are valid package identifiers
+in the workspace `foo`.
+
 ## Source files
 
 rustpkg searches for four different fixed filenames in order to determine the crates to build:
@@ -140,9 +144,11 @@ but not in their `lib` or `bin` directories.
 
 ## install
 
-`rustpkg install foo` builds the libraries and/or executables that are targets for `foo`,
-and then installs them either into `foo`'s `lib` and `bin` directories,
-or into the `lib` and `bin` subdirectories of the first entry in `RUST_PATH`.
+`rustpkg install foo` builds the libraries and/or executables that are targets for `foo`.
+If `RUST_PATH` is declared as an environment variable, then rustpkg installs the
+libraries and executables into the `lib` and `bin` subdirectories
+of the first entry in `RUST_PATH`.
+Otherwise, it installs them into `foo`'s `lib` and `bin` directories.
 
 ## test
 

src/librustc/metadata/filesearch.rs

@@ -77,15 +77,15 @@ pub fn mk_filesearch(maybe_sysroot: &Option<@Path>,
             if !found {
                 let rustpath = rust_path();
                 for path in rustpath.iter() {
-                    debug!("is %s in visited_dirs? %?",
-                            path.push("lib").to_str(),
-                            visited_dirs.contains(&path.push("lib").to_str()));
+                    let tlib_path = make_rustpkg_target_lib_path(path, self.target_triple);
+                    debug!("is %s in visited_dirs? %?", tlib_path.to_str(),
+                            visited_dirs.contains(&tlib_path.to_str()));
 
-                    if !visited_dirs.contains(&path.push("lib").to_str()) {
-                        visited_dirs.insert(path.push("lib").to_str());
+                    if !visited_dirs.contains(&tlib_path.to_str()) {
+                        visited_dirs.insert(tlib_path.to_str());
                         // Don't keep searching the RUST_PATH if one match turns up --
                         // if we did, we'd get a "multiple matching crates" error
-                        match f(&path.push("lib")) {
+                        match f(&tlib_path) {
                            FileMatches => {
                                break;
                            }
@@ -145,6 +145,11 @@ fn make_target_lib_path(sysroot: &Path,
     sysroot.push_rel(&relative_target_lib_path(target_triple))
 }
 
+fn make_rustpkg_target_lib_path(dir: &Path,
+                        target_triple: &str) -> Path {
+    dir.push_rel(&Path(libdir()).push(target_triple.to_owned()))
+}
+
 fn get_or_default_sysroot() -> Path {
     match os::self_exe_path() {
       option::Some(ref p) => (*p).pop(),

src/librustpkg/path_util.rs

@@ -14,6 +14,7 @@ pub use package_id::PkgId;
 pub use target::{OutputType, Main, Lib, Test, Bench, Target, Build, Install};
 pub use version::{Version, NoVersion, split_version_general, try_parsing_version};
 pub use rustc::metadata::filesearch::rust_path;
+use rustc::driver::driver::host_triple;
 
 use std::libc::consts::os::posix88::{S_IRUSR, S_IWUSR, S_IXUSR};
 use std::os::mkdir_recursive;
@@ -94,10 +95,29 @@ pub fn workspace_contains_package_id_(pkgid: &PkgId, workspace: &Path,
     found
 }
 
+/// Return the target-specific build subdirectory, pushed onto `base`;
+/// doesn't check that it exists or create it
+pub fn target_build_dir(workspace: &Path) -> Path {
+    workspace.push("build").push(host_triple())
+}
+
+/// Return the target-specific lib subdirectory, pushed onto `base`;
+/// doesn't check that it exists or create it
+fn target_lib_dir(workspace: &Path) -> Path {
+    workspace.push("lib").push(host_triple())
+}
+
+/// Return the bin subdirectory, pushed onto `base`;
+/// doesn't check that it exists or create it
+/// note: this isn't target-specific
+fn target_bin_dir(workspace: &Path) -> Path {
+    workspace.push("bin")
+}
+
 /// Figure out what the executable name for <pkgid> in <workspace>'s build
 /// directory is, and if the file exists, return it.
 pub fn built_executable_in_workspace(pkgid: &PkgId, workspace: &Path) -> Option<Path> {
-    let mut result = workspace.push("build");
+    let mut result = target_build_dir(workspace);
     // should use a target-specific subdirectory
     result = mk_output_path(Main, Build, pkgid, result);
     debug!("built_executable_in_workspace: checking whether %s exists",
@@ -124,7 +144,7 @@ pub fn built_bench_in_workspace(pkgid: &PkgId, workspace: &Path) -> Option<Path>
 }
 
 fn output_in_workspace(pkgid: &PkgId, workspace: &Path, what: OutputType) -> Option<Path> {
-    let mut result = workspace.push("build");
+    let mut result = target_build_dir(workspace);
     // should use a target-specific subdirectory
     result = mk_output_path(what, Build, pkgid, result);
     debug!("output_in_workspace: checking whether %s exists",
@@ -172,11 +192,21 @@ pub fn library_in_workspace(path: &Path, short_name: &str, where: Target,
             prefix = %s", short_name, where, workspace.to_str(), prefix);
 
     let dir_to_search = match where {
-        Build => workspace.push(prefix).push_rel(path),
-        Install => workspace.push(prefix)
+        Build => target_build_dir(workspace).push_rel(path),
+        Install => target_lib_dir(workspace)
     };
+
+    library_in(short_name, version, &dir_to_search)
+}
+
+// rustc doesn't use target-specific subdirectories
+pub fn system_library(sysroot: &Path, lib_name: &str) -> Option<Path> {
+    library_in(lib_name, &NoVersion, &sysroot.push("lib"))
+}
+
+fn library_in(short_name: &str, version: &Version, dir_to_search: &Path) -> Option<Path> {
     debug!("Listing directory %s", dir_to_search.to_str());
-    let dir_contents = os::list_dir(&dir_to_search);
+    let dir_contents = os::list_dir(dir_to_search);
     debug!("dir has %? entries", dir_contents.len());
 
     let lib_prefix = fmt!("%s%s", os::consts::DLL_PREFIX, short_name);
@@ -298,9 +328,10 @@ fn target_file_in_workspace(pkgid: &PkgId, workspace: &Path,
     };
     // Artifacts in the build directory live in a package-ID-specific subdirectory,
     // but installed ones don't.
-    let result = match where {
-                Build => workspace.push(subdir).push_rel(&pkgid.path),
-                _     => workspace.push(subdir)
+    let result = match (where, what) {
+                (Build, _)         => target_build_dir(workspace).push_rel(&pkgid.path),
+                (Install, Lib)     => target_lib_dir(workspace),
+                (Install, _)    => target_bin_dir(workspace)
     };
     if !os::path_exists(&result) && !mkdir_recursive(&result, U_RWX) {
         cond.raise((result.clone(), fmt!("target_file_in_workspace couldn't \
@@ -315,10 +346,10 @@ fn target_file_in_workspace(pkgid: &PkgId, workspace: &Path,
 pub fn build_pkg_id_in_workspace(pkgid: &PkgId, workspace: &Path) -> Path {
     use conditions::bad_path::cond;
 
-    let mut result = workspace.push("build");
-    // n.b. Should actually use a target-specific
-    // subdirectory of build/
+    let mut result = target_build_dir(workspace);
     result = result.push_rel(&pkgid.path);
+    debug!("Creating build dir %s for package id %s", result.to_str(),
+           pkgid.to_str());
     if os::path_exists(&result) || os::mkdir_recursive(&result, U_RWX) {
         result
     }

src/librustpkg/tests.rs

@@ -27,7 +27,7 @@ use path_util::{target_executable_in_workspace, target_test_in_workspace,
                target_bench_in_workspace, make_dir_rwx, U_RWX,
                library_in_workspace, installed_library_in_workspace,
                built_bench_in_workspace, built_test_in_workspace,
-               built_library_in_workspace, built_executable_in_workspace};
+               built_library_in_workspace, built_executable_in_workspace, target_build_dir};
 use rustc::back::link::get_cc_prog;
 use rustc::metadata::filesearch::rust_path;
 use rustc::driver::driver::{build_session, build_session_options, host_triple, optgroups};
@@ -382,7 +382,7 @@ fn llvm_bitcode_file_exists(repo: &Path, short_name: &str) -> bool {
 }
 
 fn file_exists(repo: &Path, short_name: &str, extension: &str) -> bool {
-    os::path_exists(&repo.push_many([~"build", short_name.to_owned(),
+    os::path_exists(&target_build_dir(repo).push_many([short_name.to_owned(),
                                      fmt!("%s.%s", short_name, extension)]))
 }
 
@@ -433,7 +433,7 @@ fn lib_output_file_name(workspace: &Path, parent: &str, short_name: &str) -> Pat
 }
 
 fn output_file_name(workspace: &Path, short_name: &str) -> Path {
-    workspace.push("build").push(short_name).push(fmt!("%s%s", short_name, os::EXE_SUFFIX))
+    target_build_dir(workspace).push(short_name).push(fmt!("%s%s", short_name, os::EXE_SUFFIX))
 }
 
 fn touch_source_file(workspace: &Path, pkgid: &PkgId) {
@@ -657,11 +657,10 @@ fn test_package_version() {
         None    => false
     });
     assert!(built_executable_in_workspace(&temp_pkg_id, &ws)
-            == Some(ws.push("build").
-                    push("mockgithub.com").
-                    push("catamorphism").
-                    push("test_pkg_version").
-                    push("test_pkg_version")));
+            == Some(target_build_dir(&ws).push_many([~"mockgithub.com",
+                                                    ~"catamorphism",
+                                                    ~"test_pkg_version",
+                                                    ~"test_pkg_version"])));
 }
 
 #[test]
@@ -755,7 +754,7 @@ fn package_script_with_default_build() {
     }
     command_line_test([~"install", ~"fancy-lib"], &dir);
     assert_lib_exists(&dir, &Path("fancy-lib"), NoVersion);
-    assert!(os::path_exists(&dir.push("build").push("fancy-lib").push("generated.rs")));
+    assert!(os::path_exists(&target_build_dir(&dir).push_many([~"fancy-lib", ~"generated.rs"])));
 }
 
 #[test]
@@ -1121,7 +1120,7 @@ fn test_import_rustpkg() {
               "extern mod rustpkg; fn main() {}");
     command_line_test([~"build", ~"foo"], &workspace);
     debug!("workspace = %s", workspace.to_str());
-    assert!(os::path_exists(&workspace.push("build").push("foo").push(fmt!("pkg%s",
+    assert!(os::path_exists(&target_build_dir(&workspace).push("foo").push(fmt!("pkg%s",
         os::EXE_SUFFIX))));
 }
 
@@ -1133,7 +1132,7 @@ fn test_macro_pkg_script() {
               "extern mod rustpkg; fn main() { debug!(\"Hi\"); }");
     command_line_test([~"build", ~"foo"], &workspace);
     debug!("workspace = %s", workspace.to_str());
-    assert!(os::path_exists(&workspace.push("build").push("foo").push(fmt!("pkg%s",
+    assert!(os::path_exists(&target_build_dir(&workspace).push("foo").push(fmt!("pkg%s",
         os::EXE_SUFFIX))));
 }
 
@@ -1622,6 +1621,33 @@ fn test_install_to_rust_path() {
     assert!(!executable_exists(&second_workspace, "foo"));
 }
 
+fn test_target_specific_build_dir() {
+    let p_id = PkgId::new("foo");
+    let workspace = create_local_package(&p_id);
+    command_line_test([test_sysroot().to_str(),
+                       ~"build",
+                       ~"foo"],
+                      &workspace);
+    assert!(os::path_is_dir(&target_build_dir(&workspace)));
+    assert!(built_executable_exists(&workspace, "foo"));
+    assert!(os::list_dir(&workspace.push("build")).len() == 1);
+}
+
+#[test]
+fn test_target_specific_install_dir() {
+    let p_id = PkgId::new("foo");
+    let workspace = create_local_package(&p_id);
+    command_line_test([test_sysroot().to_str(),
+                       ~"install",
+                       ~"foo"],
+                      &workspace);
+    assert!(os::path_is_dir(&workspace.push("lib").push(host_triple())));
+    assert_lib_exists(&workspace, &Path("foo"), NoVersion);
+    assert!(os::list_dir(&workspace.push("lib")).len() == 1);
+    assert!(os::path_is_dir(&workspace.push("bin")));
+    assert_executable_exists(&workspace, "foo");
+}
+
 /// Returns true if p exists and is executable
 fn is_executable(p: &Path) -> bool {
     use std::libc::consts::os::posix88::{S_IXUSR};

src/librustpkg/util.rs

@@ -23,7 +23,7 @@ use context::{in_target, StopBefore, Link, Assemble, BuildContext};
 use package_id::PkgId;
 use package_source::PkgSrc;
 use workspace::pkg_parent_workspaces;
-use path_util::{installed_library_in_workspace, U_RWX, rust_path};
+use path_util::{installed_library_in_workspace, U_RWX, rust_path, system_library, target_build_dir};
 use messages::error;
 
 pub use target::{OutputType, Main, Lib, Bench, Test};
@@ -170,7 +170,7 @@ pub fn compile_input(context: &BuildContext,
     // tjc: by default, use the package ID name as the link name
     // not sure if we should support anything else
 
-    let out_dir = workspace.push("build").push_rel(&pkg_id.path);
+    let out_dir = target_build_dir(workspace).push_rel(&pkg_id.path);
 
     let binary = os::args()[0].to_managed();
 
@@ -381,7 +381,8 @@ pub fn find_and_install_dependencies(context: &BuildContext,
                     None => sess.str_of(lib_ident)
                 };
                 debug!("Finding and installing... %s", lib_name);
-                match installed_library_in_workspace(&Path(lib_name), &context.sysroot()) {
+                // Check standard Rust library path first
+                match system_library(&context.sysroot(), lib_name) {
                     Some(ref installed_path) => {
                         debug!("It exists: %s", installed_path.to_str());
                         // Say that [path for c] has a discovered dependency on