https://github.com/frasercrmck updated
https://github.com/llvm/llvm-project/pull/146503
>From 40f82d88c4a190fd63a2aff8abc53ea22dce10f5 Mon Sep 17 00:00:00 2001
From: Fraser Cormack <fra...@codeplay.com>
Date: Mon, 30 Jun 2025 10:59:02 +0100
Subject: [PATCH 1/4] [libclc] Place libclc files in clang's resource dir
---
libclc/CMakeLists.txt | 13 ++++++++++---
1 file changed, 10 insertions(+), 3 deletions(-)
diff --git a/libclc/CMakeLists.txt b/libclc/CMakeLists.txt
index e2871d1b01a16..8bc3a75739fcd 100644
--- a/libclc/CMakeLists.txt
+++ b/libclc/CMakeLists.txt
@@ -63,6 +63,9 @@ if( LIBCLC_STANDALONE_BUILD OR CMAKE_SOURCE_DIR STREQUAL
CMAKE_CURRENT_SOURCE_DI
set( ${tool}_target )
endforeach()
endif()
+
+ # Setup the paths where libclc runtimes should be stored.
+ set( LIBCLC_OUTPUT_LIBRARY_DIR ${CMAKE_CURRENT_BINARY_DIR} )
else()
# In-tree configuration
set( LIBCLC_STANDALONE_BUILD FALSE )
@@ -82,10 +85,14 @@ else()
get_host_tool_path( llvm-link LLVM_LINK llvm-link_exe llvm-link_target )
get_host_tool_path( opt OPT opt_exe opt_target )
endif()
-endif()
-# Setup the paths where libclc runtimes should be stored.
-set( LIBCLC_OUTPUT_LIBRARY_DIR ${CMAKE_CURRENT_BINARY_DIR} )
+ # Setup the paths where libclc runtimes should be stored. By default, in an
+ # in-tree build we place the libraries in clang's resource driectory.
+ get_clang_resource_dir( LIBCLC_OUTPUT_DIR PREFIX
${LLVM_LIBRARY_OUTPUT_INTDIR}/.. )
+
+ # Note we do not adhere to LLVM_ENABLE_PER_TARGET_RUNTIME_DIR.
+ set( LIBCLC_OUTPUT_LIBRARY_DIR ${LIBCLC_OUTPUT_DIR}/lib/libclc )
+endif()
if( EXISTS ${LIBCLC_CUSTOM_LLVM_TOOLS_BINARY_DIR} )
message( WARNING "Using custom LLVM tools to build libclc: "
>From 4e134b75a220b9ba8329ae978a4cbefe04b32dab Mon Sep 17 00:00:00 2001
From: Fraser Cormack <fra...@codeplay.com>
Date: Tue, 1 Jul 2025 10:56:54 +0100
Subject: [PATCH 2/4] [clang] Add the ability to link libclc OpenCL libraries
This commit adds driver support for linking libclc OpenCL libraries. It
takes the form of a new optional flag: --libclc-lib=namespec. Nothing is
linked unless this flag is specified.
Not all libclc targets have corresponding clang targets. For this reason
it is desirable for users to be able to specify a libclc library name.
We support this by taking both a library name (without the .bc suffix)
or a filename. Both of these are searched for in the clang resource
directory or in the LIBRARY_PATH environment variable. Filenames are
also checked themselves so that absolute paths can be provided. The
syntax for specifying filenames (as opposed to library names) uses a
leading colon (:), inspired by the -l option.
To accommodate this option, libclc libraries are now placed into clang's
resource directory in an in-tree configuration. The aliases are not
currently placed there to avoid polluting the directory, but that can be
changed. The libraries are all placed in <resource-dir>/lib/libclc and
are not grouped under host-specific directories as some other runtime
libraries are; it is not expected that OpenCL libraries will differ
depending on the host toolchain.
Currently only the AMDGPU toolchain supports this option as a proof of
concept. Other targets such as NVPTX or SPIR/SPIR-V could support it
too. We could optionally let target toolchains search for libclc
libraries themselves, possibly when passed an empty --libclc-lib.
---
.../clang/Basic/DiagnosticDriverKinds.td | 3 +
clang/include/clang/Driver/CommonArgs.h | 3 +
clang/include/clang/Driver/Options.td | 2 +
clang/lib/Driver/ToolChains/AMDGPU.cpp | 2 +
clang/lib/Driver/ToolChains/CommonArgs.cpp | 59 +++++++++++++++++++
clang/test/Driver/Inputs/libclc/libclc.bc | 0
.../Driver/Inputs/libclc/subdir/libclc.bc | 0
clang/test/Driver/opencl-libclc.cl | 10 ++++
8 files changed, 79 insertions(+)
create mode 100644 clang/test/Driver/Inputs/libclc/libclc.bc
create mode 100644 clang/test/Driver/Inputs/libclc/subdir/libclc.bc
create mode 100644 clang/test/Driver/opencl-libclc.cl
diff --git a/clang/include/clang/Basic/DiagnosticDriverKinds.td
b/clang/include/clang/Basic/DiagnosticDriverKinds.td
index 34b6c0d7a8acd..019161c22a24f 100644
--- a/clang/include/clang/Basic/DiagnosticDriverKinds.td
+++ b/clang/include/clang/Basic/DiagnosticDriverKinds.td
@@ -392,6 +392,9 @@ def warn_drv_fraw_string_literals_in_cxx11 : Warning<
"ignoring '-f%select{no-|}0raw-string-literals', which is only valid for C
and C++ standards before C++11">,
InGroup<UnusedCommandLineArgument>;
+def err_drv_libclc_not_found : Error<
+ "no libclc library '%0' found in the clang resource directory or in
LIBRARY_PATH">;
+
def err_drv_invalid_malign_branch_EQ : Error<
"invalid argument '%0' to -malign-branch=; each element must be one of: %1">;
diff --git a/clang/include/clang/Driver/CommonArgs.h
b/clang/include/clang/Driver/CommonArgs.h
index 26aa3ccf84786..7e8ab82eb7863 100644
--- a/clang/include/clang/Driver/CommonArgs.h
+++ b/clang/include/clang/Driver/CommonArgs.h
@@ -215,6 +215,9 @@ void addOpenMPDeviceRTL(const Driver &D, const
llvm::opt::ArgList &DriverArgs,
StringRef BitcodeSuffix, const llvm::Triple &Triple,
const ToolChain &HostTC);
+void addOpenCLBuiltinsLib(const Driver &D, const llvm::opt::ArgList
&DriverArgs,
+ llvm::opt::ArgStringList &CC1Args);
+
void addOutlineAtomicsArgs(const Driver &D, const ToolChain &TC,
const llvm::opt::ArgList &Args,
llvm::opt::ArgStringList &CmdArgs,
diff --git a/clang/include/clang/Driver/Options.td
b/clang/include/clang/Driver/Options.td
index 483516cf1b13d..d628010ceb330 100644
--- a/clang/include/clang/Driver/Options.td
+++ b/clang/include/clang/Driver/Options.td
@@ -1421,6 +1421,8 @@ def openacc_macro_override_EQ
// End Clang specific/exclusive options for OpenACC.
+def libclc_lib_EQ : Joined<["--"], "libclc-lib=">, Group<opencl_Group>,
+ HelpText<"Namespec of libclc OpenCL bitcode library to link">;
def libomptarget_amdgpu_bc_path_EQ : Joined<["--"],
"libomptarget-amdgpu-bc-path=">, Group<i_Group>,
HelpText<"Path to libomptarget-amdgcn bitcode library">;
def libomptarget_amdgcn_bc_path_EQ : Joined<["--"],
"libomptarget-amdgcn-bc-path=">, Group<i_Group>,
diff --git a/clang/lib/Driver/ToolChains/AMDGPU.cpp
b/clang/lib/Driver/ToolChains/AMDGPU.cpp
index b7564a0495da8..e6d1baa2a1caa 100644
--- a/clang/lib/Driver/ToolChains/AMDGPU.cpp
+++ b/clang/lib/Driver/ToolChains/AMDGPU.cpp
@@ -795,6 +795,8 @@ void AMDGPUToolChain::addClangTargetOptions(
CC1Args.push_back("-fvisibility=hidden");
CC1Args.push_back("-fapply-global-visibility-to-externs");
}
+
+ addOpenCLBuiltinsLib(getDriver(), DriverArgs, CC1Args);
}
void AMDGPUToolChain::addClangWarningOptions(ArgStringList &CC1Args) const {
diff --git a/clang/lib/Driver/ToolChains/CommonArgs.cpp
b/clang/lib/Driver/ToolChains/CommonArgs.cpp
index 070901f037823..2a9abdf2004e8 100644
--- a/clang/lib/Driver/ToolChains/CommonArgs.cpp
+++ b/clang/lib/Driver/ToolChains/CommonArgs.cpp
@@ -2942,6 +2942,65 @@ void tools::addHIPRuntimeLibArgs(const ToolChain &TC,
Compilation &C,
}
}
+void tools::addOpenCLBuiltinsLib(const Driver &D,
+ const llvm::opt::ArgList &DriverArgs,
+ llvm::opt::ArgStringList &CC1Args) {
+ // Check whether user specifies a libclc bytecode library
+ if (const Arg *A = DriverArgs.getLastArg(options::OPT_libclc_lib_EQ)) {
+ SmallVector<StringRef, 8> LibraryPaths;
+
+ // Add user defined library paths from LIBRARY_PATH.
+ std::optional<std::string> LibPath =
+ llvm::sys::Process::GetEnv("LIBRARY_PATH");
+ if (LibPath) {
+ SmallVector<StringRef, 8> Frags;
+ const char EnvPathSeparatorStr[] = {llvm::sys::EnvPathSeparator, '\0'};
+ llvm::SplitString(*LibPath, Frags, EnvPathSeparatorStr);
+ for (StringRef Path : Frags)
+ LibraryPaths.emplace_back(Path.trim());
+ }
+
+ // Find device libraries in <LLVM_DIR>/lib/clang/<ver>/lib/libclc/
+ SmallString<128> LibclcPath(D.ResourceDir);
+ llvm::sys::path::append(LibclcPath, "lib", "libclc");
+ LibraryPaths.emplace_back(LibclcPath);
+
+ bool FoundBCLibrary = false;
+ StringRef LibclcNamespec(A->getValue());
+
+ // If the namespec is of the form :filename, search for that file.
+ bool FilenameSearch = LibclcNamespec.starts_with(":");
+ SmallString<128> LibclcTargetFile(
+ LibclcNamespec.drop_front(FilenameSearch ? 1 : 0));
+
+ if (FilenameSearch && llvm::sys::fs::exists(LibclcTargetFile)) {
+ FoundBCLibrary = true;
+ CC1Args.push_back("-mlink-builtin-bitcode");
+ CC1Args.push_back(DriverArgs.MakeArgString(LibclcTargetFile));
+ } else {
+ // Search the library paths for the file
+ if (!FilenameSearch)
+ LibclcTargetFile += ".bc";
+
+ for (StringRef LibraryPath : LibraryPaths) {
+ SmallString<128> LibclcPath(LibraryPath);
+ llvm::sys::path::append(LibclcPath, LibclcTargetFile);
+ if (llvm::sys::fs::exists(LibclcPath)) {
+ FoundBCLibrary = true;
+ CC1Args.push_back("-mlink-builtin-bitcode");
+ CC1Args.push_back(DriverArgs.MakeArgString(LibclcPath));
+ break;
+ }
+ }
+ }
+
+ // Since the user requested a library, if we haven't one then report an
+ // error.
+ if (!FoundBCLibrary)
+ D.Diag(diag::err_drv_libclc_not_found) << LibclcTargetFile;
+ }
+}
+
void tools::addOutlineAtomicsArgs(const Driver &D, const ToolChain &TC,
const llvm::opt::ArgList &Args,
llvm::opt::ArgStringList &CmdArgs,
diff --git a/clang/test/Driver/Inputs/libclc/libclc.bc
b/clang/test/Driver/Inputs/libclc/libclc.bc
new file mode 100644
index 0000000000000..e69de29bb2d1d
diff --git a/clang/test/Driver/Inputs/libclc/subdir/libclc.bc
b/clang/test/Driver/Inputs/libclc/subdir/libclc.bc
new file mode 100644
index 0000000000000..e69de29bb2d1d
diff --git a/clang/test/Driver/opencl-libclc.cl
b/clang/test/Driver/opencl-libclc.cl
new file mode 100644
index 0000000000000..34b863b128682
--- /dev/null
+++ b/clang/test/Driver/opencl-libclc.cl
@@ -0,0 +1,10 @@
+// RUN: %clang -### -target amdgcn-amd-amdhsa --no-offloadlib
--libclc-lib=:%S/Inputs/libclc/libclc.bc %s 2>&1 | FileCheck %s
+// RUN: env LIBRARY_PATH=%S/Inputs/libclc:$LIBRARY_PATH %clang -### -target
amdgcn-amd-amdhsa --no-offloadlib --libclc-lib=libclc %s 2>&1 | FileCheck %s
+// RUN: env LIBRARY_PATH=%S/Inputs/libclc:$LIBRARY_PATH %clang -### -target
amdgcn-amd-amdhsa --no-offloadlib --libclc-lib=:libclc.bc %s 2>&1 | FileCheck %s
+
+// RUN: env LIBRARY_PATH=%S/Inputs/libclc/subdir:$LIBRARY_PATH %clang -###
-target amdgcn-amd-amdhsa --no-offloadlib --libclc-lib=libclc %s 2>&1 |
FileCheck %s --check-prefix CHECK-SUBDIR
+// RUN: env LIBRARY_PATH=%S/Inputs/libclc/subdir:$LIBRARY_PATH %clang -###
-target amdgcn-amd-amdhsa --no-offloadlib --libclc-lib=:libclc.bc %s 2>&1 |
FileCheck %s --check-prefix CHECK-SUBDIR
+// RUN: env LIBRARY_PATH=%S/Inputs/libclc:$LIBRARY_PATH %clang -### -target
amdgcn-amd-amdhsa --no-offloadlib --libclc-lib=:subdir/libclc.bc %s 2>&1 |
FileCheck %s --check-prefix CHECK-SUBDIR
+
+// CHECK: -mlink-builtin-bitcode{{.*}}Inputs/libclc/libclc.bc
+// CHECK-SUBDIR: -mlink-builtin-bitcode{{.*}}Inputs/libclc/subdir/libclc.bc
>From 5b9e273c7a1f6947edd0b05b1eed07779fc5ec9d Mon Sep 17 00:00:00 2001
From: Fraser Cormack <fra...@codeplay.com>
Date: Tue, 1 Jul 2025 12:26:22 +0100
Subject: [PATCH 3/4] adjust LIBRARY_PATH usage in tests
---
clang/test/Driver/opencl-libclc.cl | 10 +++++-----
1 file changed, 5 insertions(+), 5 deletions(-)
diff --git a/clang/test/Driver/opencl-libclc.cl
b/clang/test/Driver/opencl-libclc.cl
index 34b863b128682..8608a4f741b23 100644
--- a/clang/test/Driver/opencl-libclc.cl
+++ b/clang/test/Driver/opencl-libclc.cl
@@ -1,10 +1,10 @@
// RUN: %clang -### -target amdgcn-amd-amdhsa --no-offloadlib
--libclc-lib=:%S/Inputs/libclc/libclc.bc %s 2>&1 | FileCheck %s
-// RUN: env LIBRARY_PATH=%S/Inputs/libclc:$LIBRARY_PATH %clang -### -target
amdgcn-amd-amdhsa --no-offloadlib --libclc-lib=libclc %s 2>&1 | FileCheck %s
-// RUN: env LIBRARY_PATH=%S/Inputs/libclc:$LIBRARY_PATH %clang -### -target
amdgcn-amd-amdhsa --no-offloadlib --libclc-lib=:libclc.bc %s 2>&1 | FileCheck %s
+// RUN: env LIBRARY_PATH=%S/Inputs/libclc %clang -### -target
amdgcn-amd-amdhsa --no-offloadlib --libclc-lib=libclc %s 2>&1 | FileCheck %s
+// RUN: env LIBRARY_PATH=%S/Inputs/libclc %clang -### -target
amdgcn-amd-amdhsa --no-offloadlib --libclc-lib=:libclc.bc %s 2>&1 | FileCheck %s
-// RUN: env LIBRARY_PATH=%S/Inputs/libclc/subdir:$LIBRARY_PATH %clang -###
-target amdgcn-amd-amdhsa --no-offloadlib --libclc-lib=libclc %s 2>&1 |
FileCheck %s --check-prefix CHECK-SUBDIR
-// RUN: env LIBRARY_PATH=%S/Inputs/libclc/subdir:$LIBRARY_PATH %clang -###
-target amdgcn-amd-amdhsa --no-offloadlib --libclc-lib=:libclc.bc %s 2>&1 |
FileCheck %s --check-prefix CHECK-SUBDIR
-// RUN: env LIBRARY_PATH=%S/Inputs/libclc:$LIBRARY_PATH %clang -### -target
amdgcn-amd-amdhsa --no-offloadlib --libclc-lib=:subdir/libclc.bc %s 2>&1 |
FileCheck %s --check-prefix CHECK-SUBDIR
+// RUN: env LIBRARY_PATH=%S/Inputs/libclc/subdir %clang -### -target
amdgcn-amd-amdhsa --no-offloadlib --libclc-lib=libclc %s 2>&1 | FileCheck %s
--check-prefix CHECK-SUBDIR
+// RUN: env LIBRARY_PATH=%S/Inputs/libclc/subdir %clang -### -target
amdgcn-amd-amdhsa --no-offloadlib --libclc-lib=:libclc.bc %s 2>&1 | FileCheck
%s --check-prefix CHECK-SUBDIR
+// RUN: env LIBRARY_PATH=%S/Inputs/libclc %clang -### -target
amdgcn-amd-amdhsa --no-offloadlib --libclc-lib=:subdir/libclc.bc %s 2>&1 |
FileCheck %s --check-prefix CHECK-SUBDIR
// CHECK: -mlink-builtin-bitcode{{.*}}Inputs/libclc/libclc.bc
// CHECK-SUBDIR: -mlink-builtin-bitcode{{.*}}Inputs/libclc/subdir/libclc.bc
>From 5f72f82793359da80a09d85155426170abad88fb Mon Sep 17 00:00:00 2001
From: Fraser Cormack <fra...@codeplay.com>
Date: Tue, 1 Jul 2025 12:50:15 +0100
Subject: [PATCH 4/4] fix path checks
---
clang/test/Driver/opencl-libclc.cl | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/clang/test/Driver/opencl-libclc.cl
b/clang/test/Driver/opencl-libclc.cl
index 8608a4f741b23..b7780d1af8d40 100644
--- a/clang/test/Driver/opencl-libclc.cl
+++ b/clang/test/Driver/opencl-libclc.cl
@@ -6,5 +6,5 @@
// RUN: env LIBRARY_PATH=%S/Inputs/libclc/subdir %clang -### -target
amdgcn-amd-amdhsa --no-offloadlib --libclc-lib=:libclc.bc %s 2>&1 | FileCheck
%s --check-prefix CHECK-SUBDIR
// RUN: env LIBRARY_PATH=%S/Inputs/libclc %clang -### -target
amdgcn-amd-amdhsa --no-offloadlib --libclc-lib=:subdir/libclc.bc %s 2>&1 |
FileCheck %s --check-prefix CHECK-SUBDIR
-// CHECK: -mlink-builtin-bitcode{{.*}}Inputs/libclc/libclc.bc
-// CHECK-SUBDIR: -mlink-builtin-bitcode{{.*}}Inputs/libclc/subdir/libclc.bc
+// CHECK: -mlink-builtin-bitcode{{.*}}Inputs{{/|\\\\}}libclc{{/|\\\\}}libclc.bc
+// CHECK-SUBDIR:
-mlink-builtin-bitcode{{.*}}Inputs{{/|\\\\}}libclc{{/|\\\\}}subdir{{/|\\\\}}libclc.bc
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