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[Driver][SYCL] Pass as system headers for external SYCL host compilation #18449

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Merged
merged 2 commits into from
May 15, 2025
Merged

[Driver][SYCL] Pass as system headers for external SYCL host compilation #18449

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deef35a
[Driver][SYCL] Pass in as system headers for external SYCL host compi…
mdtoguchi May 13, 2025
c28ceb8
Use /external:I for Windows
mdtoguchi May 14, 2025
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14 changes: 11 additions & 3 deletions clang/lib/Driver/ToolChains/Clang.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -5282,6 +5282,12 @@ void Clang::ConstructHostCompilerJob(Compilation &C, const JobAction &JA,
HostCompileArgs.push_back(TCArgs.MakeArgString(*CWD));
}

// Add /external:W0 for MSVC based compilation. We are using /external:I
// which requires /external:Wn upon usage. Use of /external:W0 disables
// warnings from headers that are included with /external:I.
if (IsMSVCHostCompiler)
HostCompileArgs.push_back("/external:W0");

// Add default header search directories.
SmallString<128> BaseDir(C.getDriver().Dir);
llvm::sys::path::append(BaseDir, "..", "include");
Expand All @@ -5292,11 +5298,13 @@ void Clang::ConstructHostCompilerJob(Compilation &C, const JobAction &JA,
// STL headers in their programs (e.g., <complex>).
SmallString<128> STLWrappersDir(SYCLDir);
llvm::sys::path::append(STLWrappersDir, "stl_wrappers");
HostCompileArgs.push_back("-I");
// Add the SYCL specific header directories as system directories for non
// MSVC compilers.
HostCompileArgs.push_back(IsMSVCHostCompiler ? "/external:I" : "-isystem");
HostCompileArgs.push_back(TCArgs.MakeArgString(SYCLDir));
HostCompileArgs.push_back("-I");
HostCompileArgs.push_back(IsMSVCHostCompiler ? "/external:I" : "-isystem");
HostCompileArgs.push_back(TCArgs.MakeArgString(STLWrappersDir));
HostCompileArgs.push_back("-I");
HostCompileArgs.push_back(IsMSVCHostCompiler ? "/external:I" : "-isystem");
HostCompileArgs.push_back(TCArgs.MakeArgString(BaseDir));

if (!OutputAdded) {
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13 changes: 11 additions & 2 deletions clang/test/Driver/sycl-host-compiler-old-model.cpp
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Expand Up @@ -4,13 +4,22 @@
// RUN: %clangxx -fsycl --no-offload-new-driver -fsycl-host-compiler=/some/dir/g++ %s -### 2>&1 \
// RUN: | FileCheck -check-prefix=HOST_COMPILER %s
// HOST_COMPILER: clang{{.*}} "-fsycl-is-device"{{.*}} "-fsycl-int-header=[[INTHEADER:.+\.h]]" "-fsycl-int-footer={{.*}}"
// HOST_COMPILER: g++{{.*}} "-c" "-include" "[[INTHEADER]]" "-iquote" "{{.*}}bin{{[/\\]+}}..{{[/\\]+}}include{{[/\\]+}}sycl"{{.*}} "-o" "[[HOSTOBJ:.+\.o]]"{{.*}}
// HOST_COMPILER: g++{{.*}} "-c" "-include" "[[INTHEADER]]"
// HOST_COMPILER-SAME: "-iquote"
// HOST_COMPILER-SAME: "-isystem" "{{.*}}bin{{[/\\]+}}..{{[/\\]+}}include{{[/\\]+}}sycl"
// HOST_COMPILER-SAME: "-isystem" "{{.*}}bin{{[/\\]+}}..{{[/\\]+}}include{{[/\\]+}}sycl{{[/\\]+}}stl_wrappers"
// HOST_COMPILER-SAME: "-isystem" "{{.*}}bin{{[/\\]+}}..{{[/\\]+}}include"
// HOST_COMPILER-SAME: "-o" "[[HOSTOBJ:.+\.o]]"
// HOST_COMPILER: ld{{.*}} "[[HOSTOBJ]]"

// RUN: %clang_cl -fsycl --no-offload-new-driver -fsycl-host-compiler=/some/dir/cl %s -### 2>&1 \
// RUN: | FileCheck -check-prefix=HOST_COMPILER_CL %s
// HOST_COMPILER_CL: clang{{.*}} "-fsycl-is-device"{{.*}} "-fsycl-int-header=[[INTHEADER:.+\.h]]" "-fsycl-int-footer={{.*}}"
// HOST_COMPILER_CL: cl{{.*}} "-c" "-Fo[[HOSTOBJ:.+\.obj]]" "-FI" "[[INTHEADER]]"{{.*}} "-I" "{{.*}}bin{{[/\\]+}}..{{[/\\]+}}include{{[/\\]+}}sycl"{{.*}}
// HOST_COMPILER_CL: cl{{.*}} "-c" "-Fo[[HOSTOBJ:.+\.obj]]" "-FI" "[[INTHEADER]]"
// HOST_COMPILER_CL-SAME: "/external:W0"
// HOST_COMPILER_CL-SAME: "/external:I" "{{.*}}bin{{[/\\]+}}..{{[/\\]+}}include{{[/\\]+}}sycl"
// HOST_COMPILER_CL-SAME: "/external:I" "{{.*}}bin{{[/\\]+}}..{{[/\\]+}}include{{[/\\]+}}sycl{{[/\\]+}}stl_wrappers"
// HOST_COMPILER_CL-SAME: "/external:I" "{{.*}}bin{{[/\\]+}}..{{[/\\]+}}include"
// HOST_COMPILER_CL: link{{.*}} "[[HOSTOBJ]]"

/// check for additional host options
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