Auto merge of #138451 - Kobzol:gcc-ci-build-gcc, r=<try>

Build GCC on CI with GCC, not Clang

It seems that GCC built with Clang misbehaves.

Prerequisite for #138395.

r? `@ghost`

Author: bors

src/bootstrap/src/core/build_steps/gcc.rs

@@ -63,18 +63,23 @@ impl Step for Gcc {
         }
 
         build_gcc(&metadata, builder, target);
-
-        let lib_alias = metadata.install_dir.join("lib/libgccjit.so.0");
-        if !lib_alias.exists() {
-            t!(builder.symlink_file(&libgccjit_path, lib_alias));
-        }
+        create_lib_alias(builder, &libgccjit_path);
 
         t!(metadata.stamp.write());
 
         GccOutput { libgccjit: libgccjit_path }
     }
 }
 
+/// Creates a libgccjit.so.0 alias next to libgccjit.so if it does not
+/// already exist
+fn create_lib_alias(builder: &Builder<'_>, libgccjit: &PathBuf) {
+    let lib_alias = libgccjit.parent().unwrap().join("libgccjit.so.0");
+    if !lib_alias.exists() {
+        t!(builder.symlink_file(libgccjit, lib_alias));
+    }
+}
+
 pub struct Meta {
     stamp: BuildStamp,
     out_dir: PathBuf,
@@ -109,8 +114,11 @@ fn try_download_gcc(builder: &Builder<'_>, target: TargetSelection) -> Option<Pa
         builder.config.download_ci_gcc(&sha, &root);
         t!(gcc_stamp.write());
     }
+
     // FIXME: put libgccjit.so into a lib directory in dist::Gcc
-    Some(root.join("libgccjit.so"))
+    let libgccjit = root.join("libgccjit.so");
+    create_lib_alias(builder, &libgccjit);
+    Some(libgccjit)
 }
 
 #[cfg(test)]
@@ -210,7 +218,7 @@ fn build_gcc(metadata: &Meta, builder: &Builder<'_>, target: TargetSelection) {
         .env("CXXFLAGS", "-Wno-everything -g -O2")
         .env("CFLAGS", "-Wno-everything -g -O2")
         .arg("--enable-host-shared")
-        .arg("--enable-languages=jit")
+        .arg("--enable-languages=c,jit,lto")
         .arg("--enable-checking=release")
         .arg("--disable-bootstrap")
         .arg("--disable-multilib")

src/ci/docker/host-x86_64/dist-x86_64-linux/Dockerfile

@@ -101,7 +101,9 @@ ENV SCRIPT python3 ../x.py build --set rust.debug=true opt-dist && \
     ./build/$HOSTS/stage0-tools-bin/opt-dist linux-ci -- python3 ../x.py dist \
     --host $HOSTS --target $HOSTS \
     --include-default-paths \
-    build-manifest bootstrap gcc
+    build-manifest bootstrap && \
+    # Use GCC for building GCC, as it seems to behave badly when built with Clang
+    CC=/rustroot/bin/cc CXX=/rustroot/bin/c++ python3 ../x.py dist gcc
 ENV CARGO_TARGET_X86_64_UNKNOWN_LINUX_GNU_LINKER=clang
 
 # This is the only builder which will create source tarballs

src/ci/github-actions/jobs.yml

@@ -90,7 +90,7 @@ envs:
     # - not running `opt-dist`'s post-optimization smoke tests on the resulting toolchain
     #
     # If you *want* these to happen however, temporarily comment it before triggering a try build.
-    DIST_TRY_BUILD: 1
+#    DIST_TRY_BUILD: 1
 
   auto:
     <<: *production