rustc: Embed LLVM bitcode by default on iOS

This commit updates rustc to embed bitcode in each object file generated by
default when compiling for iOS. This was determined in #35968 as a step
towards better compatibility with the iOS toolchain, so let's give it a spin and
see how it turns out!

Note that this also updates the `cc` dependency which should propagate this
change of embedding bitcode for C dependencies as well.

1 files changed, 2 insertions, 1 deletions

diff --git a/src/libstd/build.rs b/src/libstd/build.rs
index b3c71f4d81b..6652ff98201 100644
--- a/src/libstd/build.rs
+++ b/src/libstd/build.rs
@@ -86,6 +86,7 @@ fn main() {
 
 fn build_libbacktrace(host: &str, target: &str) -> Result<(), ()> {
     let native = native_lib_boilerplate("libbacktrace", "libbacktrace", "backtrace", ".libs")?;
+    let cflags = env::var("CFLAGS").unwrap_or_default() + " -fvisibility=hidden -O2";
 
     run(Command::new("sh")
                 .current_dir(&native.out_dir)
@@ -98,7 +99,7 @@ fn build_libbacktrace(host: &str, target: &str) -> Result<(), ()> {
                 .arg("--disable-host-shared")
                 .arg(format!("--host={}", build_helper::gnu_target(target)))
                 .arg(format!("--build={}", build_helper::gnu_target(host)))
-                .env("CFLAGS", env::var("CFLAGS").unwrap_or_default() + " -fvisibility=hidden -O2"));
+                .env("CFLAGS", cflags));
 
     run(Command::new(build_helper::make(host))
                 .current_dir(&native.out_dir)