[clang] 1ffbe8c - [clang-offload-wrapper] Disabled ELF offload notes embedding by default.

[Vyacheslav Zakharin via cfe-commits]

Author: Vyacheslav Zakharin
Date: 2021-08-18T08:18:03-07:00
New Revision: 1ffbe8c04ff269ca9847c37036fbad943820d6ae

URL: https://github.com/llvm/llvm-project/commit/1ffbe8c04ff269ca9847c37036fbad943820d6ae
DIFF: https://github.com/llvm/llvm-project/commit/1ffbe8c04ff269ca9847c37036fbad943820d6ae.diff

LOG: [clang-offload-wrapper] Disabled ELF offload notes embedding by default.

This change-set puts 93d08acaacec951dbb302f77eeae51974985b6b2 functionality
under -add-omp-offload-notes switch that is OFF by default.
CUDA toolchain is not able to handle ELF images with LLVMOMPOFFLOAD
notes for unknown reason (see https://reviews.llvm.org/D99551#2950272).
I disable the ELF notes embedding until the CUDA issue is triaged and resolved.

Differential Revision: https://reviews.llvm.org/D108246

Added: 
    

Modified: 
    clang/test/Driver/clang-offload-wrapper.c
    clang/tools/clang-offload-wrapper/ClangOffloadWrapper.cpp

Removed: 
    


################################################################################
diff  --git a/clang/test/Driver/clang-offload-wrapper.c b/clang/test/Driver/clang-offload-wrapper.c
index c671d88209744..1c84072fef80a 100644
--- a/clang/test/Driver/clang-offload-wrapper.c
+++ b/clang/test/Driver/clang-offload-wrapper.c
@@ -19,7 +19,7 @@
 //
 // Check bitcode produced by the wrapper tool.
 //
-// RUN: clang-offload-wrapper -target=x86_64-pc-linux-gnu -o %t.wrapper.bc %t.tgt 2>&1 | FileCheck %s --check-prefix ELF-WARNING
+// RUN: clang-offload-wrapper -add-omp-offload-notes -target=x86_64-pc-linux-gnu -o %t.wrapper.bc %t.tgt 2>&1 | FileCheck %s --check-prefix ELF-WARNING
 // RUN: llvm-dis %t.wrapper.bc -o - | FileCheck %s --check-prefix CHECK-IR
 
 // ELF-WARNING: is not an ELF image, so notes cannot be added to it.
@@ -58,16 +58,16 @@
 // Check that clang-offload-wrapper adds LLVMOMPOFFLOAD notes
 // into the ELF offload images:
 // RUN: yaml2obj %S/Inputs/empty-elf-template.yaml -o %t.64le -DBITS=64 -DENCODING=LSB
-// RUN: clang-offload-wrapper -target=x86_64-pc-linux-gnu -o %t.wrapper.elf64le.bc %t.64le
+// RUN: clang-offload-wrapper -add-omp-offload-notes -target=x86_64-pc-linux-gnu -o %t.wrapper.elf64le.bc %t.64le
 // RUN: llvm-dis %t.wrapper.elf64le.bc -o - | FileCheck %s --check-prefix OMPNOTES
 // RUN: yaml2obj %S/Inputs/empty-elf-template.yaml -o %t.64be -DBITS=64 -DENCODING=MSB
-// RUN: clang-offload-wrapper -target=x86_64-pc-linux-gnu -o %t.wrapper.elf64be.bc %t.64be
+// RUN: clang-offload-wrapper -add-omp-offload-notes -target=x86_64-pc-linux-gnu -o %t.wrapper.elf64be.bc %t.64be
 // RUN: llvm-dis %t.wrapper.elf64be.bc -o - | FileCheck %s --check-prefix OMPNOTES
 // RUN: yaml2obj %S/Inputs/empty-elf-template.yaml -o %t.32le -DBITS=32 -DENCODING=LSB
-// RUN: clang-offload-wrapper -target=x86_64-pc-linux-gnu -o %t.wrapper.elf32le.bc %t.32le
+// RUN: clang-offload-wrapper -add-omp-offload-notes -target=x86_64-pc-linux-gnu -o %t.wrapper.elf32le.bc %t.32le
 // RUN: llvm-dis %t.wrapper.elf32le.bc -o - | FileCheck %s --check-prefix OMPNOTES
 // RUN: yaml2obj %S/Inputs/empty-elf-template.yaml -o %t.32be -DBITS=32 -DENCODING=MSB
-// RUN: clang-offload-wrapper -target=x86_64-pc-linux-gnu -o %t.wrapper.elf32be.bc %t.32be
+// RUN: clang-offload-wrapper -add-omp-offload-notes -target=x86_64-pc-linux-gnu -o %t.wrapper.elf32be.bc %t.32be
 // RUN: llvm-dis %t.wrapper.elf32be.bc -o - | FileCheck %s --check-prefix OMPNOTES
 
 // There is no clean way for extracting the offload image

diff  --git a/clang/tools/clang-offload-wrapper/ClangOffloadWrapper.cpp b/clang/tools/clang-offload-wrapper/ClangOffloadWrapper.cpp
index bbadd909089e3..b86a927010eb2 100644
--- a/clang/tools/clang-offload-wrapper/ClangOffloadWrapper.cpp
+++ b/clang/tools/clang-offload-wrapper/ClangOffloadWrapper.cpp
@@ -76,6 +76,10 @@ static cl::opt<bool> SaveTemps(
              "This option forces print-out of the temporary files' names."),
     cl::Hidden);
 
+static cl::opt<bool> AddOpenMPOffloadNotes(
+    "add-omp-offload-notes",
+    cl::desc("Add LLVMOMPOFFLOAD ELF notes to ELF device images."), cl::Hidden);
+
 namespace {
 
 class BinaryWrapper {
@@ -630,7 +634,7 @@ int main(int argc, const char **argv) {
       return 1;
     }
     std::unique_ptr<MemoryBuffer> Buffer(std::move(*BufOrErr));
-    if (File != "-") {
+    if (File != "-" && AddOpenMPOffloadNotes) {
       // Adding ELF notes for STDIN is not supported yet.
       Buffer = Wrapper.addELFNotes(std::move(Buffer), File);
     }