vasilito
f26371ae30
libclc was vendored at recipes/dev/llvm21/source/libclc/ as a
build artifact of the llvm21 fork. This promoted it from an
implicit Mesa dependency (the CLC bitcode Mesa consumes) to a
first-class local project, mirroring how tlc, redbear-*, cub, etc.
are organized per local/AGENTS.md.
Local layout follows the existing in-house pattern:
recipes/dev/libclc -> ../../local/recipes/dev/libclc
local/recipes/dev/libclc/recipe.toml
local/recipes/dev/libclc/source/ (vendored from llvm-project)
The recipe builds libclc as a host-side CMake project using the
cookbook-sysroot clang21 binary (not the cross-compiler) to compile
OpenCL kernels to .bc bitcode. Output targets are amdgcn, amdgcn-amdhsa,
r600, generic, and spirv — the union that Mesa's clc tool consumes
for the iris/radeonsi/llvmpipe drivers. ptx-nvidiacl and clspv are
excluded because they don't map onto any Mesa hardware driver.
The recipe also wires the cookbook's native-cmake generation with
an override that points CMAKE_C_COMPILER etc. at the cookbook
sysroot's clang-21 binary. This is needed because libclc must
run on the build host (output is bitcode, not a Redox binary),
and the cookbook's default cross-toolchain would link the build
against relibc instead of host glibc.
libclc.pc is installed at usr/lib/pkgconfig/, satisfying Mesa's
dependency('libclc') lookup. The .bc files are installed under
usr/share/clc/, which is what the libclc.pc libexecdir pointer
(libexecdir=<prefix>/share/clc) expects.
This is the prerequisite for re-enabling iris, radeonsi, and the
Intel Vulkan driver in the Mesa recipe (Phase 4-6 of
local/docs/3D-DRIVER-PLAN.md). With libclc available in the
cross-sysroot, mesa's meson '-Dwith_clc -> dependency(libclc)'
resolves and the gallium drivers compile.
134 lines
4.0 KiB
C++
134 lines
4.0 KiB
C++
//===----------------------------------------------------------------------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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#if HAVE_LLVM > 0x0390
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#include "llvm/Bitcode/BitcodeReader.h"
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#include "llvm/Bitcode/BitcodeWriter.h"
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#else
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#include "llvm/Bitcode/ReaderWriter.h"
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#endif
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#include "llvm/Config/llvm-config.h"
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#include "llvm/IR/Function.h"
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#include "llvm/IR/GlobalVariable.h"
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#include "llvm/IR/LLVMContext.h"
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#include "llvm/IR/Module.h"
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#include "llvm/IRReader/IRReader.h"
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#include "llvm/Support/CommandLine.h"
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#include "llvm/Support/ErrorOr.h"
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#include "llvm/Support/FileSystem.h"
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#include "llvm/Support/ManagedStatic.h"
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#include "llvm/Support/MemoryBuffer.h"
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#include "llvm/Support/SourceMgr.h"
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#include "llvm/Support/ToolOutputFile.h"
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#include "llvm/Support/raw_ostream.h"
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#include <system_error>
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using namespace llvm;
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static ExitOnError ExitOnErr;
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static cl::opt<std::string>
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InputFilename(cl::Positional, cl::desc("<input bitcode>"), cl::init("-"));
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static cl::opt<std::string>
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OutputFilename("o", cl::desc("Output filename"),
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cl::value_desc("filename"));
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static cl::opt<bool> TextualOut("S", cl::desc("Emit LLVM textual assembly"),
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cl::init(false));
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int main(int argc, char **argv) {
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LLVMContext Context;
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llvm_shutdown_obj Y; // Call llvm_shutdown() on exit.
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cl::ParseCommandLineOptions(argc, argv, "libclc builtin preparation tool\n");
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std::string ErrorMessage;
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Module *M = nullptr;
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{
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ErrorOr<std::unique_ptr<MemoryBuffer>> BufferOrErr =
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MemoryBuffer::getFile(InputFilename);
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if (std::error_code ec = BufferOrErr.getError()) {
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ErrorMessage = ec.message();
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} else {
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std::unique_ptr<MemoryBuffer> &BufferPtr = BufferOrErr.get();
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SMDiagnostic Err;
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std::unique_ptr<llvm::Module> MPtr =
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#if HAVE_LLVM > 0x0390
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ExitOnErr(Expected<std::unique_ptr<llvm::Module>>(
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parseIR(BufferPtr.get()->getMemBufferRef(), Err, Context)));
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#else
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parseIR(BufferPtr.get()->getMemBufferRef(), Err, Context);
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#endif
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M = MPtr.release();
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}
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}
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if (!M) {
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errs() << argv[0] << ": ";
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if (ErrorMessage.size())
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errs() << ErrorMessage << "\n";
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else
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errs() << "bitcode didn't read correctly.\n";
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return 1;
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}
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// Strip the OpenCL version metadata. There are a lot of linked
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// modules in the library build, each spamming the same
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// version. This may also report a different version than the user
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// program is using. This should probably be uniqued when linking.
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if (NamedMDNode *OCLVersion = M->getNamedMetadata("opencl.ocl.version"))
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M->eraseNamedMetadata(OCLVersion);
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// Set linkage of every external definition to linkonce_odr.
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for (Module::iterator i = M->begin(), e = M->end(); i != e; ++i) {
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if (!i->isDeclaration() && i->getLinkage() == GlobalValue::ExternalLinkage)
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i->setLinkage(GlobalValue::LinkOnceODRLinkage);
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}
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for (Module::global_iterator i = M->global_begin(), e = M->global_end();
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i != e; ++i) {
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if (!i->isDeclaration() && i->getLinkage() == GlobalValue::ExternalLinkage)
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i->setLinkage(GlobalValue::LinkOnceODRLinkage);
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}
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if (OutputFilename.empty()) {
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errs() << "no output file\n";
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return 1;
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}
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std::error_code EC;
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#if HAVE_LLVM >= 0x0600
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std::unique_ptr<ToolOutputFile> Out(
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new ToolOutputFile(OutputFilename, EC, sys::fs::OF_None));
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#else
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std::unique_ptr<tool_output_file> Out(
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new tool_output_file(OutputFilename, EC, sys::fs::OF_None));
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#endif
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if (EC) {
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errs() << EC.message() << '\n';
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exit(1);
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}
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if (TextualOut)
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M->print(Out->os(), nullptr, true);
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else
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#if HAVE_LLVM >= 0x0700
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WriteBitcodeToFile(*M, Out->os());
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#else
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WriteBitcodeToFile(M, Out->os());
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#endif
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// Declare success.
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Out->keep();
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return 0;
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}
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