update gcc crate

Use gcc::Build rather than deprecated gcc::Config.
Fixes #43973

Author: RalfJung

src/Cargo.lock

@@ -18,7 +18,7 @@ fn main() {
     // Locate the actual compiler that we're invoking
     env::remove_var("CC");
     env::remove_var("CXX");
-    let mut cfg = gcc::Config::new();
+    let mut cfg = gcc::Build::new();
     cfg.cargo_metadata(false)
        .out_dir("/")
        .target(&target)

src/bootstrap/bin/sccache-plus-cl.rs

@@ -45,7 +45,7 @@ pub fn find(build: &mut Build) {
     // For all targets we're going to need a C compiler for building some shims
     // and such as well as for being a linker for Rust code.
     for target in build.targets.iter().chain(&build.hosts).cloned().chain(iter::once(build.build)) {
-        let mut cfg = gcc::Config::new();
+        let mut cfg = gcc::Build::new();
         cfg.cargo_metadata(false).opt_level(0).debug(false)
            .target(&target).host(&build.build);
 
@@ -67,7 +67,7 @@ pub fn find(build: &mut Build) {
 
     // For all host triples we need to find a C++ compiler as well
     for host in build.hosts.iter().cloned().chain(iter::once(build.build)) {
-        let mut cfg = gcc::Config::new();
+        let mut cfg = gcc::Build::new();
         cfg.cargo_metadata(false).opt_level(0).debug(false).cpp(true)
            .target(&host).host(&build.build);
         let config = build.config.target_config.get(&host);
@@ -82,7 +82,7 @@ pub fn find(build: &mut Build) {
     }
 }
 
-fn set_compiler(cfg: &mut gcc::Config,
+fn set_compiler(cfg: &mut gcc::Build,
                 gnu_compiler: &str,
                 target: Interned<String>,
                 config: Option<&Target>,

src/bootstrap/cc.rs

@@ -289,7 +289,7 @@ impl Step for TestHelpers {
         let _folder = build.fold_output(|| "build_test_helpers");
         println!("Building test helpers");
         t!(fs::create_dir_all(&dst));
-        let mut cfg = gcc::Config::new();
+        let mut cfg = gcc::Build::new();
 
         // We may have found various cross-compilers a little differently due to our
         // extra configuration, so inform gcc of these compilers. Note, though, that

src/bootstrap/native.rs

@@ -63,7 +63,7 @@ fn main() {
         _ => return,
     };
 
-    let compiler = gcc::Config::new().get_compiler();
+    let compiler = gcc::Build::new().get_compiler();
     // only msvc returns None for ar so unwrap is okay
     let ar = build_helper::cc2ar(compiler.path(), &target).unwrap();
     let cflags = compiler.args()
@@ -150,7 +150,7 @@ fn main() {
     // sure the symbols are available.
     if target.contains("androideabi") {
         println!("cargo:rerun-if-changed=pthread_atfork_dummy.c");
-        gcc::Config::new()
+        gcc::Build::new()
             .flag("-fvisibility=hidden")
             .file("pthread_atfork_dummy.c")
             .compile("libpthread_atfork_dummy.a");

src/liballoc_jemalloc/build.rs

@@ -19,7 +19,7 @@ use std::path::Path;
 
 fn main() {
     let target = env::var("TARGET").expect("TARGET was not set");
-    let cfg = &mut gcc::Config::new();
+    let cfg = &mut gcc::Build::new();
 
     let mut profile_sources = vec!["GCDAProfiling.c",
                                    "InstrProfiling.c",

src/libprofiler_builtins/build.rs

@@ -136,7 +136,7 @@ fn main() {
     let mut cmd = Command::new(&llvm_config);
     cmd.arg("--cxxflags");
     let cxxflags = output(&mut cmd);
-    let mut cfg = gcc::Config::new();
+    let mut cfg = gcc::Build::new();
     for flag in cxxflags.split_whitespace() {
         // Ignore flags like `-m64` when we're doing a cross build
         if is_crossed && flag.starts_with("-m") {

src/librustc_llvm/build.rs

@@ -14,7 +14,7 @@ extern crate gcc;
 fn main() {
     let src_dir = std::path::Path::new("../rt/hoedown/src");
     build_helper::rerun_if_changed_anything_in_dir(src_dir);
-    let mut cfg = gcc::Config::new();
+    let mut cfg = gcc::Build::new();
     cfg.file("../rt/hoedown/src/autolink.c")
        .file("../rt/hoedown/src/buffer.c")
        .file("../rt/hoedown/src/document.c")

src/librustdoc/build.rs

@@ -77,7 +77,7 @@ fn main() {
 fn build_libbacktrace(host: &str, target: &str) -> Result<(), ()> {
     let native = native_lib_boilerplate("libbacktrace", "libbacktrace", "backtrace", ".libs")?;
 
-    let compiler = gcc::Config::new().get_compiler();
+    let compiler = gcc::Build::new().get_compiler();
     // only msvc returns None for ar so unwrap is okay
     let ar = build_helper::cc2ar(compiler.path(), target).unwrap();
     let mut cflags = compiler.args().iter().map(|s| s.to_str().unwrap())