[PATCH] D97273: OpenMP: Fix object clobbering issue when using save-temps

[Pushpinder Singh via Phabricator via cfe-commits]

pdhaliwal created this revision.
pdhaliwal added reviewers: jdoerfert, JonChesterfield, ronlieb, tianshilei1992.
Herald added subscribers: guansong, yaxunl.
pdhaliwal requested review of this revision.
Herald added subscribers: cfe-commits, sstefan1.
Herald added a project: clang.

There are two preconditions to reproduce the issue,

1. Use -save-temps option
2. Provide the -o option with name equal to the input file name without the file extension. For e.g. clang a.c -o a

With the -o specified, the OffloadWrapperJobAction will produce
the object file with same name as host code object file. Due to
this clash, the OffloadWrapperAction overwrites the initial
host object file, which results in lld error. This also fixes
the issue mentioned in D96769 <https://reviews.llvm.org/D96769>.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D97273

Files:
  clang/lib/Driver/Driver.cpp
  clang/test/Driver/openmp-offload-gpu.c


Index: clang/test/Driver/openmp-offload-gpu.c
===================================================================
--- clang/test/Driver/openmp-offload-gpu.c
+++ clang/test/Driver/openmp-offload-gpu.c
@@ -300,3 +300,9 @@
 // RUN:   | FileCheck -check-prefix=OPENMP_NVPTX_WRAPPERS %s
 // OPENMP_NVPTX_WRAPPERS: clang{{.*}}"-cc1"{{.*}}"-triple" "nvptx64-nvidia-cuda"
 // OPENMP_NVPTX_WRAPPERS-SAME: "-internal-isystem" "{{.*}}openmp_wrappers"
+
+// RUN:   %clang -### -fopenmp=libomp -fopenmp-targets=nvptx64-nvidia-cuda \
+// RUN:          -save-temps -no-canonical-prefixes -ccc-print-bindings %s -o openmp-offload-gpu 2>&1 \
+// RUN:   | FileCheck -check-prefix=SAVE_TEMPS_NAMES %s
+
+// SAVE_TEMPS_NAMES-NOT: "GNU::Linker"{{.*}}["[[SAVE_TEMPS_INPUT1:.*\.o]]", "[[SAVE_TEMPS_INPUT1]]"]
Index: clang/lib/Driver/Driver.cpp
===================================================================
--- clang/lib/Driver/Driver.cpp
+++ clang/lib/Driver/Driver.cpp
@@ -4683,11 +4683,12 @@
         /*CreatePrefixForHost=*/!!A->getOffloadingHostActiveKinds() &&
             !AtTopLevel);
     if (isa<OffloadWrapperJobAction>(JA)) {
-      OffloadingPrefix += "-wrapper";
       if (Arg *FinalOutput = C.getArgs().getLastArg(options::OPT_o))
         BaseInput = FinalOutput->getValue();
       else
         BaseInput = getDefaultImageName();
+      BaseInput =
+          C.getArgs().MakeArgString(std::string(BaseInput) + "-wrapper");
     }
     Result = InputInfo(A, GetNamedOutputPath(C, *JA, BaseInput, BoundArch,
                                              AtTopLevel, MultipleArchs,


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