1 files changed, 140 insertions, 0 deletions
diff --git a/third_party/rust/clang-sys/build/static.rs b/third_party/rust/clang-sys/build/static.rs
new file mode 100644
index 0000000000..79f4baf0c6
--- /dev/null
+++ b/third_party/rust/clang-sys/build/static.rs
@@ -0,0 +1,140 @@
+// SPDX-License-Identifier: Apache-2.0
+
+extern crate glob;
+
+use std::path::{Path, PathBuf};
+
+use glob::Pattern;
+
+use common;
+
+//================================================
+// Searching
+//================================================
+
+/// Clang static libraries required to link to `libclang` 3.5 and later.
+const CLANG_LIBRARIES: &[&str] = &[
+    "clang",
+    "clangAST",
+    "clangAnalysis",
+    "clangBasic",
+    "clangDriver",
+    "clangEdit",
+    "clangFrontend",
+    "clangIndex",
+    "clangLex",
+    "clangParse",
+    "clangRewrite",
+    "clangSema",
+    "clangSerialization",
+];
+
+/// Gets the name of an LLVM or Clang static library from a path.
+fn get_library_name(path: &Path) -> Option<String> {
+    path.file_stem().map(|p| {
+        let string = p.to_string_lossy();
+        if let Some(name) = string.strip_prefix("lib") {
+            name.to_owned()
+        } else {
+            string.to_string()
+        }
+    })
+}
+
+/// Gets the LLVM static libraries required to link to `libclang`.
+fn get_llvm_libraries() -> Vec<String> {
+    common::run_llvm_config(&["--libs"])
+        .unwrap()
+        .split_whitespace()
+        .filter_map(|p| {
+            // Depending on the version of `llvm-config` in use, listed
+            // libraries may be in one of two forms, a full path to the library
+            // or simply prefixed with `-l`.
+            if let Some(path) = p.strip_prefix("-l") {
+                Some(path.into())
+            } else {
+                get_library_name(Path::new(p))
+            }
+        })
+        .collect()
+}
+
+/// Gets the Clang static libraries required to link to `libclang`.
+fn get_clang_libraries<P: AsRef<Path>>(directory: P) -> Vec<String> {
+    // Escape the directory in case it contains characters that have special
+    // meaning in glob patterns (e.g., `[` or `]`).
+    let directory = Pattern::escape(directory.as_ref().to_str().unwrap());
+    let directory = Path::new(&directory);
+
+    let pattern = directory.join("libclang*.a").to_str().unwrap().to_owned();
+    if let Ok(libraries) = glob::glob(&pattern) {
+        libraries
+            .filter_map(|l| l.ok().and_then(|l| get_library_name(&l)))
+            .collect()
+    } else {
+        CLANG_LIBRARIES.iter().map(|l| (*l).to_string()).collect()
+    }
+}
+
+/// Finds a directory containing LLVM and Clang static libraries and returns the
+/// path to that directory.
+fn find() -> PathBuf {
+    let name = if cfg!(target_os = "windows") {
+        "libclang.lib"
+    } else {
+        "libclang.a"
+    };
+
+    let files = common::search_libclang_directories(&[name.into()], "LIBCLANG_STATIC_PATH");
+    if let Some((directory, _)) = files.into_iter().next() {
+        directory
+    } else {
+        panic!("could not find any static libraries");
+    }
+}
+
+//================================================
+// Linking
+//================================================
+
+/// Finds and links to `libclang` static libraries.
+pub fn link() {
+    let cep = common::CommandErrorPrinter::default();
+
+    let directory = find();
+
+    // Specify required Clang static libraries.
+    println!("cargo:rustc-link-search=native={}", directory.display());
+    for library in get_clang_libraries(directory) {
+        println!("cargo:rustc-link-lib=static={}", library);
+    }
+
+    // Determine the shared mode used by LLVM.
+    let mode = common::run_llvm_config(&["--shared-mode"]).map(|m| m.trim().to_owned());
+    let prefix = if mode.map_or(false, |m| m == "static") {
+        "static="
+    } else {
+        ""
+    };
+
+    // Specify required LLVM static libraries.
+    println!(
+        "cargo:rustc-link-search=native={}",
+        common::run_llvm_config(&["--libdir"]).unwrap().trim_end()
+    );
+    for library in get_llvm_libraries() {
+        println!("cargo:rustc-link-lib={}{}", prefix, library);
+    }
+
+    // Specify required system libraries.
+    // MSVC doesn't need this, as it tracks dependencies inside `.lib` files.
+    if cfg!(target_os = "freebsd") {
+        println!("cargo:rustc-flags=-l ffi -l ncursesw -l c++ -l z");
+    } else if cfg!(any(target_os = "haiku", target_os = "linux")) {
+        println!("cargo:rustc-flags=-l ffi -l ncursesw -l stdc++ -l z");
+    } else if cfg!(target_os = "macos") {
+        println!("cargo:rustc-flags=-l ffi -l ncurses -l c++ -l z");
+    }
+
+    cep.discard();
+}