building with explicit settings of MAKE_INSTALL_FULL_LIBDIR and MAKE_INSTALL_LIBDIR has no effect

[doko42]

The Debian and Ubuntu packages are installed into a subdir /usr/lib/llvm-N (CMAKE_INSTALL_PREFIX). There are requests to make the binary packages Multi-Arch: same compatible. That means, you can install the same package for the default architecture, and for other architectures (e.g. amd64 and arm64). In the current install, libraries (.so., *.a) are installed into PREFIX/lib, however I would like to have them installed into PREFIX/lib/MULTIARCH (where MULTIARCH is an id like x86_64-linux-gnu, or aarch64-linux-gnu).

Passing these macros during configure,

   -DCMAKE_INSTALL_FULL_LIBDIR=/$(LLVM_DIR)/lib/$(DEB_HOST_MULTIARCH) \
   -DCMAKE_INSTALL_LIBDIR=lib/$(DEB_HOST_MULTIARCH) \

doesn't do anything. The bootstrap build still succeeds, but the default installation locations remain unchanged. Looking at the ninja -v stage2-install call, I also don't see these two macros passed anymore.

Am I missing some LLVM specific macros, or how is the libsubdir configured within LLVM?

[DavidSpickett]

Different option names but I think the same intent and problem, as in #152193.

Edit: I misread, one of the options is the same. Tell me if the problem symptoms are the same.

[doko42]

thanks for the pointer, I'll update that after a test rebuild.

Plus ideally, I'd like to have the clang installation staying the same, as this is it's own subtree in /usr/lib/llvm-21/lib/clang/21/

[doko42]

With your proposed patch, and defining LLVM_LIBDIR_SUFFIX=/$(DEB_HOST_MULTIARCH), I end up with a failure still at the end of stage1 of a staged build:

`
-- Compiler-RT supported architectures: x86_64;i386
CMake Warning at /home/packages/llvm/21/llvm-toolchain-21-21.1.6/cmake/Modules/HandleCompilerRT.cmake:8 (message):
Failed to find compiler-rt builtins library for i386-pc-linux-gnu:
/home/packages/llvm/21/llvm-toolchain-21-21.1.6/build-llvm/lib/x86_64-linux-gnu/clang/21/lib/i386-pc-linux-gnu/libclang_rt.builtins.a
Call Stack (most recent call first):
/home/packages/llvm/21/llvm-toolchain-21-21.1.6/cmake/Modules/HandleCompilerRT.cmake:102 (cache_compiler_rt_library)
/home/packages/llvm/21/llvm-toolchain-21-21.1.6/compiler-rt/cmake/Modules/AddCompilerRT.cmake:277 (find_compiler_rt_library)
/home/packages/llvm/21/llvm-toolchain-21-21.1.6/compiler-rt/lib/stats/CMakeLists.txt:23 (add_compiler_rt_runtime)

CMake Error at /home/packages/llvm/21/llvm-toolchain-21-21.1.6/compiler-rt/cmake/Modules/AddCompilerRT.cmake:279 (message):
Cannot find builtins library for the target architecture
Call Stack (most recent call first):
/home/packages/llvm/21/llvm-toolchain-21-21.1.6/compiler-rt/lib/stats/CMakeLists.txt:23 (add_compiler_rt_runtime)
`

$ find build-llvm/ -name x86_64-linux-gnu
build-llvm/lib/x86_64-linux-gnu
build-llvm/lib/lib/x86_64-linux-gnu
build-llvm/tools/polly/lib/x86_64-linux-gnu

The first dir contains all the .a libs and cmake and ocaml subdirs, which looks correct

The second one only contains build-llvm/lib/lib/x86_64-linux-gnu/clang/21/include/
Note the doubled lib subdir, and for that one, I would rather keep the files in
build-llvm/lib/clang/21/include/ (at least for the installation).

The third one contains the polly specific cmake files, which seems to be ok

complete build log at https://people.debian.org/~doko/tmp/llvm-21.buildlog

Any hints for the build failure would be welcome

[doko42]

updated the log, and disabled building the libc runtime for now. the builtins now build, but are expected in the wrong location:

$ find build-llvm/lib/lib/ -type d
build-llvm/lib/lib/
build-llvm/lib/lib/clang
build-llvm/lib/lib/clang/21
build-llvm/lib/lib/clang/21/lib
build-llvm/lib/lib/clang/21/lib/linux
build-llvm/lib/lib/x86_64-linux-gnu
build-llvm/lib/lib/x86_64-linux-gnu/clang
build-llvm/lib/lib/x86_64-linux-gnu/clang/21
build-llvm/lib/lib/x86_64-linux-gnu/clang/21/include
build-llvm/lib/lib/x86_64-linux-gnu/clang/21/include/zos_wrappers
build-llvm/lib/lib/x86_64-linux-gnu/clang/21/include/ppc_wrappers
build-llvm/lib/lib/x86_64-linux-gnu/clang/21/include/hlsl
build-llvm/lib/lib/x86_64-linux-gnu/clang/21/include/openmp_wrappers
build-llvm/lib/lib/x86_64-linux-gnu/clang/21/include/llvm_offload_wrappers
build-llvm/lib/lib/x86_64-linux-gnu/clang/21/include/llvm_libc_wrappers
build-llvm/lib/lib/x86_64-linux-gnu/clang/21/include/cuda_wrappers
build-llvm/lib/lib/x86_64-linux-gnu/clang/21/include/cuda_wrappers/bits

$ find build-llvm/ -name 'libclang*.a'
build-llvm/lib/x86_64-linux-gnu/libclangStaticAnalyzerCore.a
build-llvm/lib/x86_64-linux-gnu/libclangStaticAnalyzerFrontend.a
build-llvm/lib/x86_64-linux-gnu/libclangParse.a
build-llvm/lib/x86_64-linux-gnu/libclangSerialization.a
build-llvm/lib/x86_64-linux-gnu/libclangDriver.a
build-llvm/lib/x86_64-linux-gnu/libclangSema.a
build-llvm/lib/x86_64-linux-gnu/libclangAnalysis.a
build-llvm/lib/x86_64-linux-gnu/libclangFrontendTool.a
build-llvm/lib/x86_64-linux-gnu/libclangLex.a
build-llvm/lib/x86_64-linux-gnu/libclangBasic.a
build-llvm/lib/x86_64-linux-gnu/libclangASTMatchers.a
build-llvm/lib/x86_64-linux-gnu/libclangAST.a
build-llvm/lib/x86_64-linux-gnu/libclangStaticAnalyzerCheckers.a
build-llvm/lib/x86_64-linux-gnu/libclangToolingInclusions.a
build-llvm/lib/x86_64-linux-gnu/libclangFrontend.a
build-llvm/lib/x86_64-linux-gnu/libclangRewrite.a
build-llvm/lib/x86_64-linux-gnu/libclangToolingCore.a
build-llvm/lib/x86_64-linux-gnu/libclangInstallAPI.a
build-llvm/lib/x86_64-linux-gnu/libclangRewriteFrontend.a
build-llvm/lib/x86_64-linux-gnu/libclangAPINotes.a
build-llvm/lib/x86_64-linux-gnu/libclangExtractAPI.a
build-llvm/lib/x86_64-linux-gnu/libclangEdit.a
build-llvm/lib/x86_64-linux-gnu/libclangSupport.a
build-llvm/lib/x86_64-linux-gnu/libclangFormat.a
build-llvm/lib/x86_64-linux-gnu/libclangCodeGen.a
build-llvm/lib/x86_64-linux-gnu/libclangIndex.a
build-llvm/lib/x86_64-linux-gnu/libclangCrossTU.a
build-llvm/lib/lib/clang/21/lib/linux/libclang_rt.builtins-i386.a
build-llvm/lib/lib/clang/21/lib/linux/libclang_rt.builtins-x86_64.a

-- Compiler-RT supported architectures: x86_64;i386
CMake Warning at /home/packages/llvm/21/llvm-toolchain-21-21.1.6/cmake/Modules/HandleCompilerRT.cmake:8 (message):
Failed to find compiler-rt builtins library for i386-pc-linux-gnu:
/home/packages/llvm/21/llvm-toolchain-21-21.1.6/build-llvm/lib/x86_64-linux-gnu/clang/21/lib/i386-pc-linux-gnu/libclang_rt.builtins.a
Call Stack (most recent call first):
/home/packages/llvm/21/llvm-toolchain-21-21.1.6/cmake/Modules/HandleCompilerRT.cmake:102 (cache_compiler_rt_library)
/home/packages/llvm/21/llvm-toolchain-21-21.1.6/compiler-rt/cmake/Modules/AddCompilerRT.cmake:277 (find_compiler_rt_library)
/home/packages/llvm/21/llvm-toolchain-21-21.1.6/compiler-rt/lib/stats/CMakeLists.txt:23 (add_compiler_rt_runtime)