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[SYCL][Driver] Fix Windows CL SYCL device library detection logic #12947

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merged 2 commits into from
Mar 9, 2024
Merged

[SYCL][Driver] Fix Windows CL SYCL device library detection logic #12947

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9e1f854
[SYCL][Driver] Fix Windows CL SYCL device library detection logic
sarnex Mar 7, 2024
73d2646
Merge branch 'sycl' into rdcbig
sarnex Mar 8, 2024
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9 changes: 4 additions & 5 deletions clang/lib/Driver/ToolChains/SYCL.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -416,12 +416,11 @@ const char *SYCL::Linker::constructLLVMLinkCommand(
auto isSYCLDeviceLib = [&](const InputInfo &II) {
const ToolChain *HostTC = C.getSingleOffloadToolChain<Action::OFK_Host>();
StringRef LibPostfix = ".o";
if (HostTC->getTriple().isWindowsMSVCEnvironment() &&
C.getDriver().IsCLMode())
LibPostfix = ".obj";
else if (isNoRDCDeviceCodeLink(II))
if (isNoRDCDeviceCodeLink(II))
LibPostfix = ".bc";

else if (HostTC->getTriple().isWindowsMSVCEnvironment() &&
C.getDriver().IsCLMode())
Comment on lines +421 to +422
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I know that this was already there - but it seems redundant. Would this be sufficient?

Suggested change
else if (HostTC->getTriple().isWindowsMSVCEnvironment() &&
C.getDriver().IsCLMode())
else if (HostTC->getTriple().isWindowsMSVCEnvironment())

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@sarnex sarnex Mar 8, 2024 •
edited
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Do we always use CL mode on windows for all possible compiler executables (icpx, dpcpp, clang, etc)? I thought some of them had different effects (like even with the same oneapi install, calling icpx vs clang++ in the compiler folder would set different flags like fastmath/inining/etc, and I thought CL mode might be one of them). If Windows doesn't always use CL mode or if we aren't sure I would prefer not to change this in this PR.

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CL mode is tied to clang-cl, which is used on Windows in general. It also implies MSVC based targets (even when invoked on Linux). But of course, you can target MSVC with clang++ if you wanted, and vice-versa. Usage of clang++ on Windows also implies MSVC. I think this may cause a disconnect here. I'm fine with leaving it here and looking into an update later.

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Thanks, let me know if I should make an internal tracker for followup.

LibPostfix = ".obj";
std::string FileName = this->getToolChain().getInputFilename(II);
StringRef InputFilename = llvm::sys::path::filename(FileName);
const bool IsNVPTX = this->getToolChain().getTriple().isNVPTX();
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6 changes: 6 additions & 0 deletions clang/test/Driver/sycl-no-rdc-win.cpp
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Expand Up @@ -32,3 +32,9 @@
// CHECK: 96: clang-offload-wrapper, {95}, object, (device-sycl)
// CHECK: 97: offload, "device-sycl (spir64-unknown-unknown)" {96}, object
// CHECK: 98: linker, {9, 19, 90, 97}, image, (host-sycl)

// RUN: %clang -### -fsycl -fno-sycl-rdc -c -fsycl-targets=spir64_gen --sysroot=%S/Inputs/SYCL-windows %t1.cpp 2>&1 | FileCheck -check-prefix=CHECK-EARLY %s
// RUN: %clang_cl -### -fsycl -fno-sycl-rdc -c -fsycl-targets=spir64_gen /clang:--sysroot=%S/Inputs/SYCL-windows %t1.cpp 2>&1 | FileCheck -check-prefix=CHECK-EARLY %s
// CHECK-EARLY: llvm-link{{.*}}
// CHECK-EARLY-NOT: -only-needed
// CHECK-EARLY: llvm-link{{.*}}-only-needed
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