update Linux clang toolchain

* build in Docker image with Ubuntu 24.04 base
* include sanitizer libraries

clang/Dockerfile

@@ -1,4 +1,4 @@
-FROM ubuntu:22.04 as base_image
+FROM ubuntu:24.04 as base_image
 
 # Tools needed to install bootsrap clang.
 RUN apt-get update && apt-get install -y \

clang/bin.txt

@@ -1,4 +1,9 @@
-clang*
+clang
+clang-$clang_major
+clang-cl
+clang-cpp
+clang++
+clang-tblgen
 lld
 ld.lld
 ld64.lld

clang/clang_build.sh

@@ -65,8 +65,9 @@ clang_major_minor_version=$(echo "$clang_version" | cut -d. -f1-2)
 
 cmake -G Ninja -S llvm -B build \
     -DCMAKE_BUILD_TYPE=Release \
-    -DCMAKE_C_FLAGS="$target_cpu_arg $target_arch_arg -flto=thin -pthread -fPIC -O3 -DNDEBUG" \
-    -DCMAKE_CXX_FLAGS="$target_cpu_arg $target_arch_arg -flto=thin -pthread -fPIC -O3 -DNDEBUG" \
+    -DCMAKE_C_FLAGS="-flto=thin -pthread -fPIC -O3 -DNDEBUG $target_cpu_arg $target_arch_arg" \
+    -DCMAKE_CXX_FLAGS="-flto=thin -pthread -fPIC -O3 -DNDEBUG $target_cpu_arg $target_arch_arg" \
+    -DCMAKE_SHARED_LINKER_FLAGS="-fPIC" \
     -DCMAKE_INTERPROCEDURAL_OPTIMIZATION="on" \
     -DLLVM_ENABLE_PROJECTS="clang;lld" \
     -DLLVM_ENABLE_RUNTIMES="libcxx;libcxxabi;libunwind;compiler-rt" \
@@ -99,21 +100,4 @@ cmake -G Ninja -S llvm -B build \
 
 # Actually build Clang and friends.
 
-CC="$c_binary" CXX="$cxx_binary" LD="$lld_binary" cmake --build build --target \
-    clang \
-    lld \
-    llvm-ar \
-    llvm-as \
-    llvm-cov \
-    llvm-dwp \
-    llvm-libtool-darwin \
-    llvm-nm \
-    llvm-objcopy \
-    llvm-objdump \
-    llvm-profdata \
-    llvm-strip \
-    llvm-ranlib \
-    cxx \
-    cxxabi \
-    unwind \
-    builtins
+cmake --build build --target all

clang/clang_package.sh

@@ -34,7 +34,10 @@ case $build_arch in
         exit 1
     ;;
 esac
+
+# These values are used in the `.txt` files that define what we package.
 clang_target="$clang_arch-unknown-linux-gnu"
+clang_major=$(echo "$clang_version" | cut -d '.' -f 1)
 
 # Package the toolchain by copying everything listed from the following files:
 #
@@ -51,6 +54,10 @@ mkdir package
 mv llvm-project/build/include/$clang_target/c++/v1/__config_site llvm-project/build/include/c++/v1/__config_site
 
 # Copy all of the files into the 'package' dir.
+#
+# TODO(parkmycar): The `lib` directory is a bit heavy and we could strip out a
+# few unused `libcompiler_rt` libraries, but for now it's easier to just
+# include them all.
 
 for dir in bin include lib; do
     mkdir package/$dir