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[LinkerWrapper] Do not link device code under a relocatable link #79314

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Jan 24, 2024
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[LinkerWrapper] Do not link device code under a relocatable link #79314

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[LinkerWrapper] Do not link device code under a relocatable link
jhuber6 Jan 24, 2024
5f7d551
Add test
jhuber6 Jan 24, 2024
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12 changes: 12 additions & 0 deletions clang/test/Driver/linker-wrapper.c
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Expand Up @@ -171,3 +171,15 @@ __attribute__((visibility("protected"), used)) int x;

// AMD-TARGET-ID: clang{{.*}} -o {{.*}}.img --target=amdgcn-amd-amdhsa -mcpu=gfx90a:xnack+ -O2 -Wl,--no-undefined {{.*}}.o {{.*}}.o
// AMD-TARGET-ID: clang{{.*}} -o {{.*}}.img --target=amdgcn-amd-amdhsa -mcpu=gfx90a:xnack- -O2 -Wl,--no-undefined {{.*}}.o {{.*}}.o

// RUN: clang-offload-packager -o %t.out \
// RUN: --image=file=%t.elf.o,kind=openmp,triple=x86_64-unknown-linux-gnu \
// RUN: --image=file=%t.elf.o,kind=openmp,triple=x86_64-unknown-linux-gnu
// RUN: %clang -cc1 %s -triple x86_64-unknown-linux-gnu -emit-obj -o %t.o -fembed-offload-object=%t.out
// RUN: llvm-ar rcs %t.a %t.o
// RUN: clang-linker-wrapper --host-triple=x86_64-unknown-linux-gnu --dry-run \
// RUN: --linker-path=/usr/bin/ld.lld -- -r --whole-archive %t.a --no-whole-archive \
// RUN: %t.o -o a.out 2>&1 | FileCheck %s --check-prefix=RELOCATABLE-LINK

// RELOCATABLE-LINK-NOT: clang{{.*}} -o {{.*}}.img --target=x86_64-unknown-linux-gnu
// RELOCATABLE-LINK: /usr/bin/ld.lld{{.*}}-r
6 changes: 6 additions & 0 deletions clang/tools/clang-linker-wrapper/ClangLinkerWrapper.cpp
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Expand Up @@ -1356,6 +1356,12 @@ Expected<SmallVector<SmallVector<OffloadFile>>>
getDeviceInput(const ArgList &Args) {
llvm::TimeTraceScope TimeScope("ExtractDeviceCode");

// If the user is requesting a reloctable link we ignore the device code. The
// actual linker will merge the embedded device code sections so they can be
// linked when the executable is finally created.
if (Args.hasArg(OPT_relocatable))
return SmallVector<SmallVector<OffloadFile>>{};

StringRef Root = Args.getLastArgValue(OPT_sysroot_EQ);
SmallVector<StringRef> LibraryPaths;
for (const opt::Arg *Arg : Args.filtered(OPT_library_path, OPT_libpath))
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3 changes: 3 additions & 0 deletions clang/tools/clang-linker-wrapper/LinkerWrapperOpts.td
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Expand Up @@ -127,6 +127,9 @@ def version : Flag<["--", "-"], "version">, Flags<[HelpHidden]>, Alias<v>;
def whole_archive : Flag<["--", "-"], "whole-archive">, Flags<[HelpHidden]>;
def no_whole_archive : Flag<["--", "-"], "no-whole-archive">, Flags<[HelpHidden]>;

def relocatable : Flag<["--", "-"], "relocatable">, Flags<[HelpHidden]>;
def r : Flag<["-"], "r">, Alias<relocatable>, Flags<[HelpHidden]>;

// link.exe-style linker options.
def out : Joined<["/", "-", "/?", "-?"], "out:">, Flags<[HelpHidden]>;
def libpath : Joined<["/", "-", "/?", "-?"], "libpath:">, Flags<[HelpHidden]>;
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