[HIP] use bootstrap to build libc++

[yaxunl]

Summary

Recent libc++ changes request clang-11 or gcc-11 to build.

Switch to a bootstrap build step to use built clang to build libc++.

[Mordante]

LGTM, I assume you tested the modifications locally.
I'm not sure other whether other reviewers need to sign off zorg changes, so please give them some time to respond.

zorg/buildbot/builders/annotated/hip-build.sh

87

The two comments seem a bit out of place.

[yaxunl]

zorg/buildbot/builders/annotated/hip-build.sh

87

I will remove them.

[yaxunl]

Is there a way to test this script without committing the change? I tried running it manually but it fails due to undefined variable BUILDBOT_BUILDERNAME.

[yaxunl]

I tested the make command sequences with my local git repo and the sequence works. I will put the HIP buildbot to staging temporarily and commit my change.

zorg/buildbot/builders/annotated/hip-build.sh

 build_step "Configure LLVM Build"
 LLVM_BUILD_DIR="${BUILD_DIR}/llvm"
 mkdir -p "${LLVM_BUILD_DIR}"
 cd "${LLVM_BUILD_DIR}"
 cmake -G Ninja \
   -DCMAKE_BUILD_TYPE="Release" \
   -DCMAKE_VERBOSE_MAKEFILE=1 \
   -DLLVM_TARGETS_TO_BUILD="AMDGPU;X86" \
-  -DLLVM_ENABLE_PROJECTS="clang;lld;clang-tools-extra;compiler-rt;libcxx;libcxxabi" \
+  -DLLVM_ENABLE_PROJECTS="clang;lld;clang-tools-extra;compiler-rt" \
+  -DLLVM_ENABLE_RUNTIMES="libcxx;libcxxabi" \
   -DLIBCXX_ENABLE_SHARED=OFF \
   -DLIBCXX_ENABLE_STATIC=ON \
   -DLIBCXX_INSTALL_LIBRARY=OFF \
   -DLIBCXX_INSTALL_HEADERS=OFF \
   -DLIBCXXABI_ENABLE_SHARED=OFF \
   -DLIBCXXABI_ENABLE_STATIC=ON \
   -DLIBCXXABI_INSTALL_STATIC_LIBRARY=OFF \
   -DCMAKE_INSTALL_PREFIX="${DESTDIR}" \
   -DLLVM_ENABLE_ASSERTIONS=ON \
   -DLLVM_ENABLE_Z3_SOLVER=OFF \
   -DLLVM_ENABLE_ZLIB=ON \
   -DLLVM_LIT_ARGS="-v -vv" \
   ${LLVM_ROOT}/llvm
 
 build_step "Building LLVM"
+ninja runtimes
 ninja
 
 build_step "Install LLVM"
 rm -rf "${DESTDIR}"
+ninja install-runtimes
 ninja install
 
 # Start building llvm-test-suite's hip tests
 build_step "Configuring HIP test-suite"
 TEST_BUILD_DIR=${BUILD_DIR}/test-suite-build
 rm -rf ${TEST_BUILD_DIR}
 mkdir -p ${TEST_BUILD_DIR}
 cd ${TEST_BUILD_DIR}