[RISC-V] Adapt the build scripts for standard Ubuntu cross build container because there is no CBL Mariner container for RISC-V. Besides, it's more convenient to work in one docker only.

Author: tomeksowi

build-coredistools.sh

@@ -17,14 +17,13 @@ CMakeOSXArchitectures=
 LLVMTargetsToBuild="AArch64;ARM;X86"
 
 # Figure out which `strip` to use. Prefer `llvm-strip` if it is available.
-# `llvm-strip` is available in CBL-Mariner container; `strip` is available on macOS.
-StripTool=$(command -v llvm-strip)
+# `llvm-strip` is available in CBL-Mariner container,
+# `llvm-strip-<version>` is available on standard cross build Ubuntu container,
+# `strip` is available on macOS.
+StripTool=$(command -v llvm-strip{,-{20..15}} strip | head -n 1)
 if [ -z "$StripTool" ]; then
-    StripTool=$(command -v strip)
-    if [ -z "$StripTool" ]; then
-        echo "Strip tool not found"
-        exit 1
-    fi
+    echo "Strip tool not found"
+    exit 1
 fi
 
 TblGenTool=$(command -v llvm-tblgen)
@@ -33,13 +32,14 @@ if [ -z "$TblGenTool" ]; then
     exit 1
 fi
 
-C_COMPILER=$(command -v clang)
+# Take first match from: clang clang-20 clang-19 .. clang-15
+C_COMPILER=$(command -v clang{,-{20..15}} | head -n 1)
 if [ -z "$C_COMPILER" ]; then
     echo "C compiler not found"
     # Keep going in case cmake can find one?
 fi
 
-CXX_COMPILER=$(command -v clang++)
+CXX_COMPILER=$(command -v clang++{,-{20..15}} | head -n 1)
 if [ -z "$CXX_COMPILER" ]; then
     echo "C++ compiler not found"
     # Keep going in case cmake can find one?
@@ -83,6 +83,7 @@ case "$TargetOSArchitecture" in
         CMakeCrossCompiling=ON
         LLVMHostTriple=riscv64-linux-gnu
         LLVMTargetsToBuild="RISCV"
+        EnsureCrossRootfsDirectoryExists
         ;;
 
     osx-arm64)

build-tblgen.sh

@@ -70,14 +70,18 @@ fi
 
 pushd "$BinariesDirectory"
 
+# Take first match from: clang clang-20 clang-19 .. clang-15
+C_COMPILER=$(command -v clang{,-{20..15}} | head -n 1)
+CXX_COMPILER=$(command -v clang++{,-{20..15}} | head -n 1)
+
 if [ -z "$CrossRootfsDirectory" ]; then
     BUILD_FLAGS=""
     cmake \
         -G "Unix Makefiles" \
         -DCMAKE_BUILD_TYPE=Release \
         -DCMAKE_CROSSCOMPILING=$CMakeCrossCompiling \
-        -DCMAKE_C_COMPILER=$(command -v clang) \
-        -DCMAKE_CXX_COMPILER=$(command -v clang++) \
+        -DCMAKE_C_COMPILER=$C_COMPILER \
+        -DCMAKE_CXX_COMPILER=$CXX_COMPILER \
         -DCMAKE_C_FLAGS="${BUILD_FLAGS}" \
         -DCMAKE_CXX_FLAGS="${BUILD_FLAGS}" \
         -DCMAKE_INSTALL_PREFIX=$RootDirectory \
@@ -92,8 +96,8 @@ elif [ $CrossBuildUsingMariner -eq 1 ]; then
         -DCMAKE_BUILD_TYPE=Release \
         -DCMAKE_INSTALL_PREFIX=$RootDirectory \
         -DCMAKE_CROSSCOMPILING=$CMakeCrossCompiling \
-        -DCMAKE_C_COMPILER=$(command -v clang) \
-        -DCMAKE_CXX_COMPILER=$(command -v clang++) \
+        -DCMAKE_C_COMPILER=$C_COMPILER \
+        -DCMAKE_CXX_COMPILER=$CXX_COMPILER \
         -DCMAKE_C_FLAGS="${BUILD_FLAGS}" \
         -DCMAKE_CXX_FLAGS="${BUILD_FLAGS}" \
         -DCMAKE_EXE_LINKER_FLAGS="-fuse-ld=lld" \
@@ -109,8 +113,8 @@ else
         -DCMAKE_BUILD_TYPE=Release \
         -DCMAKE_INSTALL_PREFIX=$RootDirectory \
         -DCMAKE_CROSSCOMPILING=$CMakeCrossCompiling \
-        -DCMAKE_C_COMPILER=$(command -v clang) \
-        -DCMAKE_CXX_COMPILER=$(command -v clang++) \
+        -DCMAKE_C_COMPILER=$C_COMPILER \
+        -DCMAKE_CXX_COMPILER=$CXX_COMPILER \
         -DCMAKE_C_FLAGS="${BUILD_FLAGS}" \
         -DCMAKE_CXX_FLAGS="${BUILD_FLAGS}" \
         -DCMAKE_INCLUDE_PATH=$CrossRootfsDirectory/usr/include \

doc/building-coredistools.md

@@ -105,3 +105,17 @@ sudo tdnf install -y ncurses-compat
 export PATH=$(pwd)/bin:$PATH
 ./build-coredistools.sh linux-arm /crossrootfs/arm
 ```
+
+8. Build `libcoredistools.so` for Linux riscv64 under Docker:
+There is no CBL Mariner container for RISC-V so use the standard Ubuntu cross build container used for e.g. dotnet/runtime.
+```
+docker run -it --rm --entrypoint /bin/bash -v ~/git/jitutils:/opt/code -w /opt/code mcr.microsoft.com/dotnet-buildtools/prereqs:ubuntu-22.04-cross-riscv64
+apt install libtinfo5
+
+# If you haven't built llvm-tblgen in step 5, you can do so in the same docker (pass "/" as crossrootfs).
+./build-tblgen.sh linux-x64 /
+
+# Now, the main course
+export PATH=$(pwd)/bin:$PATH
+./build-coredistools.sh linux-riscv64 /crossrootfs/riscv64
+```