tcwg_kernel-build.sh: Fill build_llvm* functions

... and add print_llvm_target helper.

Change-Id: I20b048d4acd942a6e4a06acb2308489f00391a9a

1 files changed, 67 insertions, 0 deletions

diff --git a/tcwg_kernel-build.sh b/tcwg_kernel-build.sh
index 99565168..abfac6b3 100755
--- a/tcwg_kernel-build.sh
+++ b/tcwg_kernel-build.sh
@@ -305,12 +305,79 @@ build_abe ()
     )
 }
 
+# Build LLVM
 build_llvm_1 ()
 {
+    (
+    set -euf -o pipefail
+
+    clone_repo llvm
+
+    # Copy only components from the monorepo that are required for kernel build
+    rsync -a --del --exclude /tools/clang ${git_dirs[llvm]}/llvm/ llvm-src/
+    rsync -a --del ${git_dirs[llvm]}/clang/ llvm-src/tools/clang/
+
+    # Setup ccache and ninja wrappers.
+    rm -rf $(pwd)/bin
+    mkdir $(pwd)/bin
+
+    cat > $(pwd)/bin/cc <<EOF
+#!/bin/sh
+exec ccache /usr/bin/gcc "\$@"
+EOF
+    chmod +x $(pwd)/bin/cc
+
+    cat > $(pwd)/bin/c++ <<EOF
+#!/bin/sh
+exec ccache /usr/bin/g++ "\$@"
+EOF
+    chmod +x $(pwd)/bin/c++
+
+    if [ -f /usr/local/bin/ninja.bin ]; then
+	# Use ninja configuration from llvm buildbots to avoid running out of RAM.
+	cat > $(pwd)/bin/ninja <<EOF
+#!/bin/sh
+exec /usr/local/bin/ninja.bin -m 30 -M 50 -D 5000 "\$@"
+EOF
+	chmod +x $(pwd)/bin/ninja
+    fi
+
+    export PATH=$(pwd)/bin:$PATH
+
+    # Remove stale build directories.  We rely on ccache for fast rebuilds.
+    rm -rf llvm-build llvm-install
+    mkdir -p llvm-build
+    cd llvm-build
+
+    cmake -G Ninja  ../llvm-src -DCMAKE_BUILD_TYPE=Release -DLLVM_ENABLE_ASSERTIONS=True -DCMAKE_INSTALL_PREFIX=../llvm-install -DLLVM_TARGETS_TO_BUILD=$(print_llvm_target $target)
+    ccache -z
+    ninja
+    ninja install
+    ccache -s
+    )
 }
 
+# Build LLVM
 build_llvm ()
 {
+    (
+    set -euf -o pipefail
+
+    build_llvm_1 &
+    res=0; wait $! || res=$?
+
+    # Update artifacts on success.
+    if [ $res = 0 ]; then
+	echo "Finished build_llvm" >> $top_artifacts/results
+	echo "-1" >> $top_artifacts/results
+	touch $run_step_artifacts/build-ok
+    fi
+
+    if $tidy; then
+	rm -rf llvm-src llvm-build
+	git_clean llvm
+    fi
+    )
 }
 
 build_linux ()