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llvm/llvm-project/libclc/17eb59a7646b7f8243dfb5bb19a9097d201e42d1
commit
17eb59a7646b7f8243dfb5bb19a9097d201e42d1
[log]
author
Wenju He <wenju.he@intel.com>
Mon Aug 11 18:05:42 2025 +0800
committer
Copybara-Service <copybara-worker@google.com>
Mon Aug 11 03:10:11 2025 -0700
tree
18534ad2ed1cb017d8d0a4d89826ffd3a643922d
parent
4bf537b28f6be2c0b2d31862e3d9b9b0959f07ba [diff]
[libclc] Fix libclc install on Windows when MSVC generator is used (#152703)

Fix a regression of df7473673214.

cmake MSVC generator is multiple configurations. Build type is not known
at configure time and CMAKE_CFG_INTDIR is evaluated to $(Configuration)
at configure time. libclc install fails since $(Configuration) in
bitcode file path is unresolved in libclc/cmake_install.cmake at install time.

We need a solution that resolves libclc bitcode file path at install
time. This PR fixes the issue using CMAKE_INSTALL_CONFIG_NAME which can
be evaluated at install time. This is the same solution as in
https://reviews.llvm.org/D76827

GitOrigin-RevId: 68c609b6c80561488dc7e820e5f826741639e3ca
1 file changed
tree: 18534ad2ed1cb017d8d0a4d89826ffd3a643922d
  1. clc/
  2. cmake/
  3. opencl/
  4. test/
  5. utils/
  6. www/
  7. check_external_calls.sh
  8. CMakeLists.txt
  9. compile-test.sh
  10. CREDITS.TXT
  11. libclc.pc.in
  12. LICENSE.TXT
  13. Maintainers.md
  14. README.md
README.md

libclc

libclc is an open source implementation of the library requirements of the OpenCL C programming language, as specified by the OpenCL 1.1 Specification. The following sections of the specification impose library requirements:

  • 6.1: Supported Data Types
  • 6.2.3: Explicit Conversions
  • 6.2.4.2: Reinterpreting Types Using as_type() and as_typen()
  • 6.9: Preprocessor Directives and Macros
  • 6.11: Built-in Functions
  • 9.3: Double Precision Floating-Point
  • 9.4: 64-bit Atomics
  • 9.5: Writing to 3D image memory objects
  • 9.6: Half Precision Floating-Point

libclc is intended to be used with the Clang compiler's OpenCL frontend.

libclc is designed to be portable and extensible. To this end, it provides generic implementations of most library requirements, allowing the target to override the generic implementation at the granularity of individual functions.

libclc currently supports PTX, AMDGPU, SPIRV and CLSPV targets, but support for more targets is welcome.

Compiling and installing

(in the following instructions you can use make or ninja)

For an in-tree build, Clang must also be built at the same time:

$ cmake <path-to>/llvm-project/llvm/CMakeLists.txt -DLLVM_ENABLE_PROJECTS="libclc;clang" \
    -DCMAKE_BUILD_TYPE=Release -G Ninja
$ ninja

Then install:

$ ninja install

Note you can use the DESTDIR Makefile variable to do staged installs.

$ DESTDIR=/path/for/staged/install ninja install

To build out of tree, or in other words, against an existing LLVM build or install:

$ cmake <path-to>/llvm-project/libclc/CMakeLists.txt -DCMAKE_BUILD_TYPE=Release \
  -G Ninja -DLLVM_DIR=$(<path-to>/llvm-config --cmakedir)
$ ninja

Then install as before.

In both cases this will include all supported targets. You can choose which targets are enabled by passing -DLIBCLC_TARGETS_TO_BUILD to CMake. The default is all.

In both cases, the LLVM used must include the targets you want libclc support for (AMDGPU and NVPTX are enabled in LLVM by default). Apart from SPIRV where you do not need an LLVM target but you do need the llvm-spirv tool available. Either build this in-tree, or place it in the directory pointed to by LLVM_TOOLS_BINARY_DIR.

Website

https://libclc.llvm.org/