Fix comments

Author: AdrianCX

src/bootstrap/compile.rs

@@ -133,6 +133,13 @@ fn copy_third_party_objects(
 ) -> Vec<(PathBuf, DependencyType)> {
     let mut target_deps = vec![];
 
+    // FIXME: remove this in 2021
+    if target == "x86_64-fortanix-unknown-sgx" {
+        if env::var_os("X86_FORTANIX_SGX_LIBS").is_some() {
+            builder.info("Warning: X86_FORTANIX_SGX_LIBS environment variable is ignored, libunwind is now compiled as part of rustbuild");
+        }
+    }
+
     if builder.config.sanitizers && compiler.stage != 0 {
         // The sanitizers are only copied in stage1 or above,
         // to avoid creating dependency on LLVM.

src/ci/docker/dist-various-2/Dockerfile

@@ -73,7 +73,7 @@ COPY dist-various-2/x86_64-fortanix-unknown-sgx-clang-wrap.sh /usr/bin/x86_64-fo
 RUN ln -s /usr/bin/x86_64-fortanix-unknown-sgx-clang-11 /usr/bin/x86_64-fortanix-unknown-sgx-clang++-11
 # We pass the commit id of the port of LLVM's libunwind to the build script.
 # Any update to the commit id here, should cause the container image to be re-built from this point on.
-RUN /tmp/build-x86_64-fortanix-unknown-sgx-toolchain.sh "800f95131fe6acd20b96b6f4723ca3c820f3d379"
+RUN /tmp/build-x86_64-fortanix-unknown-sgx-toolchain.sh
 
 COPY dist-various-2/build-wasi-toolchain.sh /tmp/
 RUN /tmp/build-wasi-toolchain.sh

src/ci/docker/dist-various-2/build-x86_64-fortanix-unknown-sgx-toolchain.sh

@@ -3,14 +3,7 @@
 set -eu
 source shared.sh
 
-if [ -z "$1" ]; then
-    echo "Usage: ${0} <commit_id>"
-    exit -1
-fi
-
 target="x86_64-fortanix-unknown-sgx"
-url="https://github.com/fortanix/llvm-project/archive/${1}.tar.gz"
-repo_name="llvm-project"
 
 install_prereq() {
     curl https://apt.llvm.org/llvm-snapshot.gpg.key|apt-key add -