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[clang][amdgpu] Use implicit code object version

At present, clang always passes amdhsa-code-object-version on to -cc1. That is
great for certainty over what object version is being used when debugging.

Unfortunately, the command line argument is in AMDGPUBaseInfo.cpp in the amdgpu
target. If clang is used with an llvm compiled with DLLVM_TARGETS_TO_BUILD
that excludes amdgpu, this will be diagnosed (as discovered via D98658 
<https://reviews.llvm.org/D98658>):

- Unknown command line argument '--amdhsa-code-object-version=4'

This means that clang, built only for X86, can be used to compile the nvptx
devicertl for openmp but not the amdgpu one. That would shortly spawn fragile
logic in the devicertl cmake to try to guess whether the clang used will work.

This change omits the amdhsa-code-object-version parameter when it matches the
default that AMDGPUBaseInfo.cpp specifies, with a comment to indicate why. As
this is the only part of clang's codegen for amdgpu that depends on the target
in the back end it suffices to build the openmp runtime on most (all?) systems.

It is a non-functional change, though observable in the updated tests and when
compiling with -###. It may cause minor disruption to the amd-stg-open branch.

Revision of D98746 <https://reviews.llvm.org/D98746>, builds on refactor in 
D101077 <https://reviews.llvm.org/D101077>


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D101095

Files:
  clang/lib/Driver/ToolChains/Clang.cpp
  clang/lib/Driver/ToolChains/CommonArgs.cpp
  clang/lib/Driver/ToolChains/CommonArgs.h
  clang/test/Driver/hip-autolink.hip
  clang/test/Driver/hip-code-object-version.hip
  clang/test/Driver/hip-device-compile.hip
  clang/test/Driver/hip-host-cpu-features.hip
  clang/test/Driver/hip-rdc-device-only.hip
  clang/test/Driver/hip-target-id.hip
  clang/test/Driver/hip-toolchain-mllvm.hip
  clang/test/Driver/hip-toolchain-no-rdc.hip
  clang/test/Driver/hip-toolchain-opt.hip
  clang/test/Driver/hip-toolchain-rdc-separate.hip
  clang/test/Driver/hip-toolchain-rdc-static-lib.hip
  clang/test/Driver/hip-toolchain-rdc.hip

Index: clang/test/Driver/hip-toolchain-rdc.hip
===================================================================
--- clang/test/Driver/hip-toolchain-rdc.hip
+++ clang/test/Driver/hip-toolchain-rdc.hip
@@ -34,7 +34,7 @@
 // CHECK-SAME: {{.*}} [[B_SRC:".*b.hip"]]
 
 // generate image for device side path on gfx803
-// CHECK: [[CLANG]] "-cc1" "-mllvm" "--amdhsa-code-object-version={{[0-9]+}}" "-triple" "amdgcn-amd-amdhsa"
+// CHECK: [[CLANG]] "-cc1" "-triple" "amdgcn-amd-amdhsa"
 // CHECK-SAME: "-aux-triple" "x86_64-unknown-linux-gnu"
 // CHECK-SAME: "-emit-llvm-bc"
 // CHECK-SAME: {{.*}} "-main-file-name" "a.cu"
@@ -46,7 +46,7 @@
 // CHECK-SAME: {{.*}} "-o" [[A_BC1:".*bc"]] "-x" "hip"
 // CHECK-SAME: {{.*}} [[A_SRC]]
 
-// CHECK: [[CLANG]] "-cc1" "-mllvm" "--amdhsa-code-object-version={{[0-9]+}}" "-triple" "amdgcn-amd-amdhsa"
+// CHECK: [[CLANG]] "-cc1" "-triple" "amdgcn-amd-amdhsa"
 // CHECK-SAME: "-aux-triple" "x86_64-unknown-linux-gnu"
 // CHECK-SAME: "-emit-llvm-bc"
 // CHECK-SAME: {{.*}} "-main-file-name" "b.hip"
@@ -66,7 +66,7 @@
 // CHECK-SAME: "-o" "[[IMG_DEV1:.*.out]]" [[A_BC1]] [[B_BC1]]
 
 // generate image for device side path on gfx900
-// CHECK: [[CLANG]] "-cc1" "-mllvm" "--amdhsa-code-object-version={{[0-9]+}}" "-triple" "amdgcn-amd-amdhsa"
+// CHECK: [[CLANG]] "-cc1" "-triple" "amdgcn-amd-amdhsa"
 // CHECK-SAME: "-aux-triple" "x86_64-unknown-linux-gnu"
 // CHECK-SAME: "-emit-llvm-bc"
 // CHECK-SAME: {{.*}} "-main-file-name" "a.cu"
@@ -76,7 +76,7 @@
 // CHECK-SAME: {{.*}} "-o" [[A_BC2:".*bc"]] "-x" "hip"
 // CHECK-SAME: {{.*}} [[A_SRC]]
 
-// CHECK: [[CLANG]] "-cc1" "-mllvm" "--amdhsa-code-object-version={{[0-9]+}}" "-triple" "amdgcn-amd-amdhsa"
+// CHECK: [[CLANG]] "-cc1" "-triple" "amdgcn-amd-amdhsa"
 // CHECK-SAME: "-aux-triple" "x86_64-unknown-linux-gnu"
 // CHECK-SAME: "-emit-llvm-bc"
 // CHECK-SAME: {{.*}} "-main-file-name" "b.hip"
Index: clang/test/Driver/hip-toolchain-rdc-static-lib.hip
===================================================================
--- clang/test/Driver/hip-toolchain-rdc-static-lib.hip
+++ clang/test/Driver/hip-toolchain-rdc-static-lib.hip
@@ -28,7 +28,7 @@
 // CHECK-SAME: {{.*}} [[B_SRC:".*b.hip"]]
 
 // generate image for device side path on gfx803
-// CHECK: [[CLANG]] "-cc1" "-mllvm" "--amdhsa-code-object-version={{[0-9]+}}" "-triple" "amdgcn-amd-amdhsa"
+// CHECK: [[CLANG]] "-cc1" "-triple" "amdgcn-amd-amdhsa"
 // CHECK-SAME: "-aux-triple" "x86_64-unknown-linux-gnu"
 // CHECK-SAME: "-emit-llvm-bc"
 // CHECK-SAME: {{.*}} "-main-file-name" "a.cu"
@@ -38,7 +38,7 @@
 // CHECK-SAME: {{.*}} "-o" [[A_BC1:".*bc"]] "-x" "hip"
 // CHECK-SAME: {{.*}} [[A_SRC]]
 
-// CHECK: [[CLANG]] "-cc1" "-mllvm" "--amdhsa-code-object-version={{[0-9]+}}" "-triple" "amdgcn-amd-amdhsa"
+// CHECK: [[CLANG]] "-cc1" "-triple" "amdgcn-amd-amdhsa"
 // CHECK-SAME: "-aux-triple" "x86_64-unknown-linux-gnu"
 // CHECK-SAME: "-emit-llvm-bc"
 // CHECK-SAME: {{.*}} "-main-file-name" "b.hip"
@@ -56,7 +56,7 @@
 // CHECK-SAME: "-o" "[[IMG_DEV1:.*out]]" [[A_BC1]] [[B_BC1]]
 
 // generate image for device side path on gfx900
-// CHECK: [[CLANG]] "-cc1" "-mllvm" "--amdhsa-code-object-version={{[0-9]+}}" "-triple" "amdgcn-amd-amdhsa"
+// CHECK: [[CLANG]] "-cc1" "-triple" "amdgcn-amd-amdhsa"
 // CHECK-SAME: "-aux-triple" "x86_64-unknown-linux-gnu"
 // CHECK-SAME: "-emit-llvm-bc"
 // CHECK-SAME: {{.*}} "-main-file-name" "a.cu"
@@ -66,7 +66,7 @@
 // CHECK-SAME: {{.*}} "-o" [[A_BC2:".*bc"]] "-x" "hip"
 // CHECK-SAME: {{.*}} [[A_SRC]]
 
-// CHECK: [[CLANG]] "-cc1" "-mllvm" "--amdhsa-code-object-version={{[0-9]+}}" "-triple" "amdgcn-amd-amdhsa"
+// CHECK: [[CLANG]] "-cc1" "-triple" "amdgcn-amd-amdhsa"
 // CHECK-SAME: "-aux-triple" "x86_64-unknown-linux-gnu"
 // CHECK-SAME: "-emit-llvm-bc"
 // CHECK-SAME: {{.*}} "-main-file-name" "b.hip"
Index: clang/test/Driver/hip-toolchain-rdc-separate.hip
===================================================================
--- clang/test/Driver/hip-toolchain-rdc-separate.hip
+++ clang/test/Driver/hip-toolchain-rdc-separate.hip
@@ -12,7 +12,7 @@
 // RUN:   %S/Inputs/hip_multiple_inputs/b.hip \
 // RUN: 2>&1 | FileCheck %s
 
-// CHECK: [[CLANG:".*clang.*"]] "-cc1" "-mllvm" "--amdhsa-code-object-version={{[0-9]+}}" "-triple" "amdgcn-amd-amdhsa"
+// CHECK: [[CLANG:".*clang.*"]] "-cc1" "-triple" "amdgcn-amd-amdhsa"
 // CHECK-SAME: "-aux-triple" "x86_64-unknown-linux-gnu"
 // CHECK-SAME: "-emit-llvm-bc"
 // CHECK-SAME: {{.*}} "-main-file-name" "a.cu"
@@ -24,7 +24,7 @@
 // CHECK-SAME: {{.*}} "-o" "[[A_BC1:.*bc]]" "-x" "hip"
 // CHECK-SAME: {{.*}} [[A_SRC:".*a.cu"]]
 
-// CHECK: [[CLANG]] "-cc1" "-mllvm" "--amdhsa-code-object-version={{[0-9]+}}" "-triple" "amdgcn-amd-amdhsa"
+// CHECK: [[CLANG]] "-cc1" "-triple" "amdgcn-amd-amdhsa"
 // CHECK-SAME: "-aux-triple" "x86_64-unknown-linux-gnu"
 // CHECK-SAME: "-emit-llvm-bc"
 // CHECK-SAME: {{.*}} "-main-file-name" "a.cu"
@@ -47,7 +47,7 @@
 // CHECK-SAME: "-targets=hip-amdgcn-amd-amdhsa-gfx803,hip-amdgcn-amd-amdhsa-gfx900,host-x86_64-unknown-linux-gnu"
 // CHECK-SAME: "-outputs=[[A_O:.*a.o]]" "-inputs=[[A_BC1]],[[A_BC2]],[[A_OBJ_HOST]]"
 
-// CHECK: [[CLANG]] "-cc1" "-mllvm" "--amdhsa-code-object-version={{[0-9]+}}" "-triple" "amdgcn-amd-amdhsa"
+// CHECK: [[CLANG]] "-cc1" "-triple" "amdgcn-amd-amdhsa"
 // CHECK-SAME: "-aux-triple" "x86_64-unknown-linux-gnu"
 // CHECK-SAME: "-emit-llvm-bc"
 // CHECK-SAME: {{.*}} "-main-file-name" "b.hip"
@@ -59,7 +59,7 @@
 // CHECK-SAME: {{.*}} "-o" "[[B_BC1:.*bc]]" "-x" "hip"
 // CHECK-SAME: {{.*}} [[B_SRC:".*b.hip"]]
 
-// CHECK: [[CLANG]] "-cc1" "-mllvm" "--amdhsa-code-object-version={{[0-9]+}}" "-triple" "amdgcn-amd-amdhsa"
+// CHECK: [[CLANG]] "-cc1" "-triple" "amdgcn-amd-amdhsa"
 // CHECK-SAME: "-aux-triple" "x86_64-unknown-linux-gnu"
 // CHECK-SAME: "-emit-llvm-bc"
 // CHECK-SAME: {{.*}} "-main-file-name" "b.hip"
Index: clang/test/Driver/hip-toolchain-opt.hip
===================================================================
--- clang/test/Driver/hip-toolchain-opt.hip
+++ clang/test/Driver/hip-toolchain-opt.hip
@@ -58,7 +58,7 @@
 // RUN:   %S/Inputs/hip_multiple_inputs/b.hip \
 // RUN: 2>&1 | FileCheck --check-prefixes=ALL,Og %s
 
-// ALL: "{{.*}}clang{{.*}}" "-cc1" "-mllvm" "--amdhsa-code-object-version={{[0-9]+}}" "-triple" "amdgcn-amd-amdhsa"
+// ALL: "{{.*}}clang{{.*}}" "-cc1" "-triple" "amdgcn-amd-amdhsa"
 // DEFAULT-NOT: "-O{{.}}"
 // O0-SAME: "-O0"
 // O1-SAME: "-O1"
Index: clang/test/Driver/hip-toolchain-no-rdc.hip
===================================================================
--- clang/test/Driver/hip-toolchain-no-rdc.hip
+++ clang/test/Driver/hip-toolchain-no-rdc.hip
@@ -34,7 +34,7 @@
 // Compile device code in a.cu to code object for gfx803.
 //
 
-// CHECK: [[CLANG:".*clang.*"]] "-cc1" "-mllvm" "--amdhsa-code-object-version={{[0-9]+}}" "-triple" "amdgcn-amd-amdhsa"
+// CHECK: [[CLANG:".*clang.*"]] "-cc1" "-triple" "amdgcn-amd-amdhsa"
 // CHECK-SAME: "-aux-triple" "x86_64-unknown-linux-gnu"
 // CHECK-SAME: "-emit-obj"
 // CHECK-SAME: {{.*}} "-main-file-name" "a.cu"
@@ -57,7 +57,7 @@
 // Compile device code in a.cu to code object for gfx900.
 //
 
-// CHECK: [[CLANG:".*clang.*"]] "-cc1" "-mllvm" "--amdhsa-code-object-version={{[0-9]+}}" "-triple" "amdgcn-amd-amdhsa"
+// CHECK: [[CLANG:".*clang.*"]] "-cc1" "-triple" "amdgcn-amd-amdhsa"
 // CHECK-SAME: "-aux-triple" "x86_64-unknown-linux-gnu"
 // CHECK-SAME: "-emit-obj"
 // CHECK-SAME: {{.*}} "-main-file-name" "a.cu"
@@ -97,7 +97,7 @@
 // Compile device code in b.hip to code object for gfx803.
 //
 
-// CHECK: [[CLANG:".*clang.*"]] "-cc1" "-mllvm" "--amdhsa-code-object-version={{[0-9]+}}" "-triple" "amdgcn-amd-amdhsa"
+// CHECK: [[CLANG:".*clang.*"]] "-cc1" "-triple" "amdgcn-amd-amdhsa"
 // CHECK-SAME: "-aux-triple" "x86_64-unknown-linux-gnu"
 // CHECK-SAME: "-emit-obj"
 // CHECK-SAME: {{.*}} "-main-file-name" "b.hip"
@@ -120,7 +120,7 @@
 // Compile device code in b.hip to code object for gfx900.
 //
 
-// CHECK: [[CLANG:".*clang.*"]] "-cc1" "-mllvm" "--amdhsa-code-object-version={{[0-9]+}}" "-triple" "amdgcn-amd-amdhsa"
+// CHECK: [[CLANG:".*clang.*"]] "-cc1" "-triple" "amdgcn-amd-amdhsa"
 // CHECK-SAME: "-aux-triple" "x86_64-unknown-linux-gnu"
 // CHECK-SAME: "-emit-obj"
 // CHECK-SAME: {{.*}} "-main-file-name" "b.hip"
Index: clang/test/Driver/hip-toolchain-mllvm.hip
===================================================================
--- clang/test/Driver/hip-toolchain-mllvm.hip
+++ clang/test/Driver/hip-toolchain-mllvm.hip
@@ -12,7 +12,7 @@
 // RUN:   -fgpu-rdc -mllvm -amdgpu-function-calls=0 \
 // RUN:   %s 2>&1 | FileCheck -check-prefixes=CHECK,RDC %s
 
-// CHECK: [[CLANG:".*clang.*"]] "-cc1" "-mllvm" "--amdhsa-code-object-version={{[0-9]+}}" "-triple" "amdgcn-amd-amdhsa"
+// CHECK: [[CLANG:".*clang.*"]] "-cc1" "-triple" "amdgcn-amd-amdhsa"
 // CHECK-SAME: "-aux-triple" "x86_64-unknown-linux-gnu"
 // CHECK-SAME: {{.*}} "-target-cpu" "gfx803"
 // CHECK-SAME: {{.*}} "-mllvm" "-amdgpu-function-calls=0" {{.*}}
@@ -21,7 +21,7 @@
 // CHECK-NOT: {{".*llc"}}
 // RDC: [[LLD:".*lld.*"]] {{.*}} "-plugin-opt=-amdgpu-function-calls=0"
 
-// CHECK: [[CLANG]] "-cc1" "-mllvm" "--amdhsa-code-object-version={{[0-9]+}}" "-triple" "amdgcn-amd-amdhsa"
+// CHECK: [[CLANG]] "-cc1" "-triple" "amdgcn-amd-amdhsa"
 // CHECK-SAME: "-aux-triple" "x86_64-unknown-linux-gnu"
 // CHECK-SAME: {{.*}} "-target-cpu" "gfx900"
 // CHECK-SAME: {{.*}} "-mllvm" "-amdgpu-function-calls=0" {{.*}}
Index: clang/test/Driver/hip-target-id.hip
===================================================================
--- clang/test/Driver/hip-target-id.hip
+++ clang/test/Driver/hip-target-id.hip
@@ -25,12 +25,12 @@
 // RUN:   -fgpu-rdc \
 // RUN:   %s 2>&1 | FileCheck --check-prefixes=CHECK %s
 
-// CHECK: [[CLANG:"[^"]*clang[^"]*"]] "-cc1" "-mllvm" "--amdhsa-code-object-version={{[0-9]+}}" "-triple" "amdgcn-amd-amdhsa"
+// CHECK: [[CLANG:"[^"]*clang[^"]*"]] "-cc1" "-triple" "amdgcn-amd-amdhsa"
 // CHECK-SAME: "-target-cpu" "gfx908"
 // CHECK-SAME: "-target-feature" "+sramecc"
 // CHECK-SAME: "-target-feature" "+xnack"
 
-// TMP: [[CLANG:"[^"]*clang[^"]*"]] "-cc1as" "-mllvm" "--amdhsa-code-object-version={{[0-9]+}}" "-triple" "amdgcn-amd-amdhsa"
+// TMP: [[CLANG:"[^"]*clang[^"]*"]] "-cc1as" "-triple" "amdgcn-amd-amdhsa"
 // TMP-SAME: "-target-cpu" "gfx908"
 // TMP-SAME: "-target-feature" "+sramecc"
 // TMP-SAME: "-target-feature" "+xnack"
@@ -38,7 +38,7 @@
 // CHECK: [[LLD:"[^"]*lld[^"]*"]] {{.*}} "-plugin-opt=mcpu=gfx908"
 // CHECK-SAME: "-plugin-opt=-mattr=+sramecc,+xnack"
 
-// CHECK: [[CLANG]] "-cc1" "-mllvm" "--amdhsa-code-object-version={{[0-9]+}}" "-triple" "amdgcn-amd-amdhsa"
+// CHECK: [[CLANG]] "-cc1" "-triple" "amdgcn-amd-amdhsa"
 // CHECK-SAME: "-target-cpu" "gfx908"
 // CHECK-SAME: "-target-feature" "-sramecc"
 // CHECK-SAME: "-target-feature" "+xnack"
Index: clang/test/Driver/hip-rdc-device-only.hip
===================================================================
--- clang/test/Driver/hip-rdc-device-only.hip
+++ clang/test/Driver/hip-rdc-device-only.hip
@@ -47,7 +47,7 @@
 // RUN:   %S/Inputs/hip_multiple_inputs/b.hip \
 // RUN: 2>&1 | FileCheck -check-prefix=SAVETEMP %s
 
-// COMMON: [[CLANG:".*clang.*"]] "-cc1" "-mllvm" "--amdhsa-code-object-version={{[0-9]+}}" "-triple" "amdgcn-amd-amdhsa"
+// COMMON: [[CLANG:".*clang.*"]] "-cc1" "-triple" "amdgcn-amd-amdhsa"
 // COMMON-SAME: "-aux-triple" "x86_64-unknown-linux-gnu"
 // EMITBC-SAME: "-emit-llvm-bc"
 // EMITLL-SAME: "-emit-llvm"
@@ -60,7 +60,7 @@
 // EMITLL-SAME: {{.*}} "-o" {{"a.*ll"}} "-x" "hip"
 // CHECK-SAME: {{.*}} {{".*a.cu"}}
 
-// COMMON: [[CLANG]] "-cc1" "-mllvm" "--amdhsa-code-object-version={{[0-9]+}}" "-triple" "amdgcn-amd-amdhsa"
+// COMMON: [[CLANG]] "-cc1" "-triple" "amdgcn-amd-amdhsa"
 // COMMON-SAME: "-aux-triple" "x86_64-unknown-linux-gnu"
 // EMITBC-SAME: "-emit-llvm-bc"
 // EMITLL-SAME: "-emit-llvm"
@@ -73,7 +73,7 @@
 // EMITLL-SAME: {{.*}} "-o" {{"a.*ll"}} "-x" "hip"
 // COMMON-SAME: {{.*}} {{".*a.cu"}}
 
-// COMMON: [[CLANG]] "-cc1" "-mllvm" "--amdhsa-code-object-version={{[0-9]+}}" "-triple" "amdgcn-amd-amdhsa"
+// COMMON: [[CLANG]] "-cc1" "-triple" "amdgcn-amd-amdhsa"
 // COMMON-SAME: "-aux-triple" "x86_64-unknown-linux-gnu"
 // EMITBC-SAME: "-emit-llvm-bc"
 // EMITLL-SAME: "-emit-llvm"
@@ -86,7 +86,7 @@
 // EMITLL-SAME: {{.*}} "-o" {{"b.*ll"}} "-x" "hip"
 // COMMON-SAME: {{.*}} {{".*b.hip"}}
 
-// COMMON: [[CLANG]] "-cc1" "-mllvm" "--amdhsa-code-object-version={{[0-9]+}}" "-triple" "amdgcn-amd-amdhsa"
+// COMMON: [[CLANG]] "-cc1" "-triple" "amdgcn-amd-amdhsa"
 // COMMON-SAME: "-aux-triple" "x86_64-unknown-linux-gnu"
 // EMITBC-SAME: "-emit-llvm-bc"
 // EMITLL-SAME: "-emit-llvm"
@@ -99,54 +99,54 @@
 // EMITLL-SAME: {{.*}} "-o" {{"b.*ll"}} "-x" "hip"
 // COMMON-SAME: {{.*}} {{".*b.hip"}}
 
-// SAVETEMP: [[CLANG:".*clang.*"]] "-cc1" "-mllvm" "--amdhsa-code-object-version={{[0-9]+}}" "-triple" "amdgcn-amd-amdhsa" "-aux-triple" "x86_64-unknown-linux-gnu"
+// SAVETEMP: [[CLANG:".*clang.*"]] "-cc1" "-triple" "amdgcn-amd-amdhsa" "-aux-triple" "x86_64-unknown-linux-gnu"
 // SAVETEMP-SAME: "-E"
 // SAVETEMP-SAME: {{.*}} "-main-file-name" "a.cu" {{.*}} "-target-cpu" "gfx803"
 // SAVETEMP-SAME: {{.*}} "-o" [[A_GFX803_CUI:"a.*cui"]] "-x" "hip" {{".*a.cu"}}
-// SAVETEMP-NEXT: [[CLANG]] "-cc1" "-mllvm" "--amdhsa-code-object-version={{[0-9]+}}" "-triple" "amdgcn-amd-amdhsa" "-aux-triple" "x86_64-unknown-linux-gnu"
+// SAVETEMP-NEXT: [[CLANG]] "-cc1" "-triple" "amdgcn-amd-amdhsa" "-aux-triple" "x86_64-unknown-linux-gnu"
 // SAVETEMP-SAME: "-emit-llvm-bc"
 // SAVETEMP-SAME: {{.*}} "-main-file-name" "a.cu" {{.*}} "-target-cpu" "gfx803"
 // SAVETEMP-SAME: {{.*}} "-o" [[A_GFX803_TMP_BC:"a.*tmp.bc"]] "-x" "hip-cpp-output" [[A_GFX803_CUI]]
-// SAVETEMP-NEXT: [[CLANG]] "-cc1" "-mllvm" "--amdhsa-code-object-version={{[0-9]+}}" "-triple" "amdgcn-amd-amdhsa" "-aux-triple" "x86_64-unknown-linux-gnu"
+// SAVETEMP-NEXT: [[CLANG]] "-cc1" "-triple" "amdgcn-amd-amdhsa" "-aux-triple" "x86_64-unknown-linux-gnu"
 // SAVETEMP-SAME: "-emit-llvm"
 // SAVETEMP-SAME: {{.*}} "-main-file-name" "a.cu" {{.*}} "-target-cpu" "gfx803"
 // SAVETEMP-SAME: {{.*}} "-o" {{"a.*.ll"}} "-x" "ir" [[A_GFX803_TMP_BC]]
 
-// SAVETEMP: [[CLANG]] "-cc1" "-mllvm" "--amdhsa-code-object-version={{[0-9]+}}" "-triple" "amdgcn-amd-amdhsa" "-aux-triple" "x86_64-unknown-linux-gnu"
+// SAVETEMP: [[CLANG]] "-cc1" "-triple" "amdgcn-amd-amdhsa" "-aux-triple" "x86_64-unknown-linux-gnu"
 // SAVETEMP-SAME: "-E"
 // SAVETEMP-SAME: {{.*}} "-main-file-name" "a.cu" {{.*}} "-target-cpu" "gfx900"
 // SAVETEMP-SAME: {{.*}} "-o" [[A_GFX900_CUI:"a.*cui"]] "-x" "hip" {{".*a.cu"}}
-// SAVETEMP-NEXT: [[CLANG]] "-cc1" "-mllvm" "--amdhsa-code-object-version={{[0-9]+}}" "-triple" "amdgcn-amd-amdhsa" "-aux-triple" "x86_64-unknown-linux-gnu"
+// SAVETEMP-NEXT: [[CLANG]] "-cc1" "-triple" "amdgcn-amd-amdhsa" "-aux-triple" "x86_64-unknown-linux-gnu"
 // SAVETEMP-SAME: "-emit-llvm-bc"
 // SAVETEMP-SAME: {{.*}} "-main-file-name" "a.cu" {{.*}} "-target-cpu" "gfx900"
 // SAVETEMP-SAME: {{.*}} "-o" [[A_GFX900_TMP_BC:"a.*tmp.bc"]] "-x" "hip-cpp-output" [[A_GFX900_CUI]]
-// SAVETEMP-NEXT: [[CLANG]] "-cc1" "-mllvm" "--amdhsa-code-object-version={{[0-9]+}}" "-triple" "amdgcn-amd-amdhsa" "-aux-triple" "x86_64-unknown-linux-gnu"
+// SAVETEMP-NEXT: [[CLANG]] "-cc1" "-triple" "amdgcn-amd-amdhsa" "-aux-triple" "x86_64-unknown-linux-gnu"
 // SAVETEMP-SAME: "-emit-llvm"
 // SAVETEMP-SAME: {{.*}} "-main-file-name" "a.cu" {{.*}} "-target-cpu" "gfx900"
 // SAVETEMP-SAME: {{.*}} "-o" {{"a.*.ll"}} "-x" "ir" [[A_GFX900_TMP_BC]]
 
-// SAVETEMP: [[CLANG]] "-cc1" "-mllvm" "--amdhsa-code-object-version={{[0-9]+}}" "-triple" "amdgcn-amd-amdhsa" "-aux-triple" "x86_64-unknown-linux-gnu"
+// SAVETEMP: [[CLANG]] "-cc1" "-triple" "amdgcn-amd-amdhsa" "-aux-triple" "x86_64-unknown-linux-gnu"
 // SAVETEMP-SAME: "-E"
 // SAVETEMP-SAME: {{.*}} "-main-file-name" "b.hip" {{.*}} "-target-cpu" "gfx803"
 // SAVETEMP-SAME: {{.*}} "-o" [[B_GFX803_CUI:"b.*cui"]] "-x" "hip" {{".*b.hip"}}
-// SAVETEMP-NEXT: [[CLANG]] "-cc1" "-mllvm" "--amdhsa-code-object-version={{[0-9]+}}" "-triple" "amdgcn-amd-amdhsa" "-aux-triple" "x86_64-unknown-linux-gnu"
+// SAVETEMP-NEXT: [[CLANG]] "-cc1" "-triple" "amdgcn-amd-amdhsa" "-aux-triple" "x86_64-unknown-linux-gnu"
 // SAVETEMP-SAME: "-emit-llvm-bc"
 // SAVETEMP-SAME: {{.*}} "-main-file-name" "b.hip" {{.*}} "-target-cpu" "gfx803"
 // SAVETEMP-SAME: {{.*}} "-o" [[B_GFX803_TMP_BC:"b.*tmp.bc"]] "-x" "hip-cpp-output" [[B_GFX803_CUI]]
-// SAVETEMP-NEXT: [[CLANG]] "-cc1" "-mllvm" "--amdhsa-code-object-version={{[0-9]+}}" "-triple" "amdgcn-amd-amdhsa" "-aux-triple" "x86_64-unknown-linux-gnu"
+// SAVETEMP-NEXT: [[CLANG]] "-cc1" "-triple" "amdgcn-amd-amdhsa" "-aux-triple" "x86_64-unknown-linux-gnu"
 // SAVETEMP-SAME: "-emit-llvm"
 // SAVETEMP-SAME: {{.*}} "-main-file-name" "b.hip" {{.*}} "-target-cpu" "gfx803"
 // SAVETEMP-SAME: {{.*}} "-o" {{"b.*.ll"}} "-x" "ir" [[B_GFX803_TMP_BC]]
 
-// SAVETEMP: [[CLANG]] "-cc1" "-mllvm" "--amdhsa-code-object-version={{[0-9]+}}" "-triple" "amdgcn-amd-amdhsa" "-aux-triple" "x86_64-unknown-linux-gnu"
+// SAVETEMP: [[CLANG]] "-cc1" "-triple" "amdgcn-amd-amdhsa" "-aux-triple" "x86_64-unknown-linux-gnu"
 // SAVETEMP-SAME: "-E"
 // SAVETEMP-SAME: {{.*}} "-main-file-name" "b.hip" {{.*}} "-target-cpu" "gfx900"
 // SAVETEMP-SAME: {{.*}} "-o" [[B_GFX900_CUI:"b.*cui"]] "-x" "hip" {{".*b.hip"}}
-// SAVETEMP-NEXT: [[CLANG]] "-cc1" "-mllvm" "--amdhsa-code-object-version={{[0-9]+}}" "-triple" "amdgcn-amd-amdhsa" "-aux-triple" "x86_64-unknown-linux-gnu"
+// SAVETEMP-NEXT: [[CLANG]] "-cc1" "-triple" "amdgcn-amd-amdhsa" "-aux-triple" "x86_64-unknown-linux-gnu"
 // SAVETEMP-SAME: "-emit-llvm-bc"
 // SAVETEMP-SAME: {{.*}} "-main-file-name" "b.hip" {{.*}} "-target-cpu" "gfx900"
 // SAVETEMP-SAME: {{.*}} "-o" [[B_GFX900_TMP_BC:"b.*tmp.bc"]] "-x" "hip-cpp-output" [[B_GFX900_CUI]]
-// SAVETEMP-NEXT: [[CLANG]] "-cc1" "-mllvm" "--amdhsa-code-object-version={{[0-9]+}}" "-triple" "amdgcn-amd-amdhsa" "-aux-triple" "x86_64-unknown-linux-gnu"
+// SAVETEMP-NEXT: [[CLANG]] "-cc1" "-triple" "amdgcn-amd-amdhsa" "-aux-triple" "x86_64-unknown-linux-gnu"
 // SAVETEMP-SAME: "-emit-llvm"
 // SAVETEMP-SAME: {{.*}} "-main-file-name" "b.hip" {{.*}} "-target-cpu" "gfx900"
 // SAVETEMP-SAME: {{.*}} "-o" {{"b.*.ll"}} "-x" "ir" [[B_GFX900_TMP_BC]]
Index: clang/test/Driver/hip-host-cpu-features.hip
===================================================================
--- clang/test/Driver/hip-host-cpu-features.hip
+++ clang/test/Driver/hip-host-cpu-features.hip
@@ -6,14 +6,14 @@
 // RUN: %clang -### -c -target x86_64-linux-gnu -msse3 --cuda-gpu-arch=gfx803 -nogpulib %s 2>&1 | FileCheck %s -check-prefix=HOSTSSE3
 // RUN: %clang -### -c -target x86_64-linux-gnu --gpu-use-aux-triple-only -march=znver2 --cuda-gpu-arch=gfx803 -nogpulib %s 2>&1 | FileCheck %s -check-prefix=NOHOSTCPU
 
-// HOSTCPU: "-cc1" "-mllvm" "--amdhsa-code-object-version={{[0-9]+}}" "-triple" "amdgcn-amd-amdhsa"
+// HOSTCPU: "-cc1" "-triple" "amdgcn-amd-amdhsa"
 // HOSTCPU-SAME: "-aux-triple" "x86_64-unknown-linux-gnu"
 // HOSTCPU-SAME: "-aux-target-cpu" "znver2"
 
-// HOSTSSE3: "-cc1" "-mllvm" "--amdhsa-code-object-version={{[0-9]+}}" "-triple" "amdgcn-amd-amdhsa"
+// HOSTSSE3: "-cc1" "-triple" "amdgcn-amd-amdhsa"
 // HOSTSSE3-SAME: "-aux-triple" "x86_64-unknown-linux-gnu"
 // HOSTSSE3-SAME: "-aux-target-feature" "+sse3"
 
-// NOHOSTCPU: "-cc1" "-mllvm" "--amdhsa-code-object-version={{[0-9]+}}" "-triple" "amdgcn-amd-amdhsa"
+// NOHOSTCPU: "-cc1" "-triple" "amdgcn-amd-amdhsa"
 // NOHOSTCPU-SAME: "-aux-triple" "x86_64-unknown-linux-gnu"
 // NOHOSTCPU-NOT: "-aux-target-cpu" "znver2"
Index: clang/test/Driver/hip-device-compile.hip
===================================================================
--- clang/test/Driver/hip-device-compile.hip
+++ clang/test/Driver/hip-device-compile.hip
@@ -26,7 +26,7 @@
 // RUN:   %S/Inputs/hip_multiple_inputs/a.cu \
 // RUN: 2>&1 | FileCheck -check-prefixes=CHECK,ASM %s
 
-// CHECK: {{".*clang.*"}} "-cc1" "-mllvm" "--amdhsa-code-object-version={{[0-9]+}}" "-triple" "amdgcn-amd-amdhsa"
+// CHECK: {{".*clang.*"}} "-cc1" "-triple" "amdgcn-amd-amdhsa"
 // CHECK-SAME: "-aux-triple" "x86_64-unknown-linux-gnu"
 // BC-SAME: "-emit-llvm-bc"
 // LL-SAME: "-emit-llvm"
Index: clang/test/Driver/hip-code-object-version.hip
===================================================================
--- clang/test/Driver/hip-code-object-version.hip
+++ clang/test/Driver/hip-code-object-version.hip
@@ -53,7 +53,6 @@
 // RUN:   --offload-arch=gfx906 -nogpulib \
 // RUN:   %s 2>&1 | FileCheck -check-prefix=VD %s
 
-// VD: "-mllvm" "--amdhsa-code-object-version=4"
 // VD: "-targets=host-x86_64-unknown-linux,hipv4-amdgcn-amd-amdhsa--gfx906"
 
 // Check invalid code object version option.
Index: clang/test/Driver/hip-autolink.hip
===================================================================
--- clang/test/Driver/hip-autolink.hip
+++ clang/test/Driver/hip-autolink.hip
@@ -7,7 +7,7 @@
 // RUN: %clang --target=i386-pc-windows-msvc --cuda-gpu-arch=gfx906 -nogpulib \
 // RUN:   --cuda-host-only %s -### 2>&1 | FileCheck --check-prefix=HOST %s
 
-// DEV: "-cc1" "-mllvm" "--amdhsa-code-object-version={{[0-9]+}}" "-triple" "amdgcn-amd-amdhsa"
+// DEV: "-cc1" "-triple" "amdgcn-amd-amdhsa"
 // DEV-SAME: "-fno-autolink"
 
 // HOST: "-cc1" "-triple" "i386-pc-windows-msvc{{.*}}"
Index: clang/lib/Driver/ToolChains/CommonArgs.h
===================================================================
--- clang/lib/Driver/ToolChains/CommonArgs.h
+++ clang/lib/Driver/ToolChains/CommonArgs.h
@@ -141,6 +141,9 @@
 void checkAMDGPUCodeObjectVersion(const Driver &D,
                                   const llvm::opt::ArgList &Args);
 
+int getAMDGPURequestedCodeObjectVersion(const Driver &D,
+                                        const llvm::opt::ArgList &Args);
+
 unsigned getAMDGPUCodeObjectVersion(const Driver &D,
                                     const llvm::opt::ArgList &Args);
 
Index: clang/lib/Driver/ToolChains/CommonArgs.cpp
===================================================================
--- clang/lib/Driver/ToolChains/CommonArgs.cpp
+++ clang/lib/Driver/ToolChains/CommonArgs.cpp
@@ -1606,9 +1606,8 @@
   }
 }
 
-unsigned tools::getAMDGPUCodeObjectVersion(const Driver &D,
-                                           const llvm::opt::ArgList &Args) {
-  unsigned CodeObjVer = 4; // default
+int tools::getAMDGPURequestedCodeObjectVersion(const Driver &D,
+                                               const llvm::opt::ArgList &Args) {
 
   // The last of -mcode-object-v3, -mno-code-object-v3 and
   // -mcode-object-version=<version> wins.
@@ -1618,15 +1617,27 @@
                           options::OPT_mcode_object_version_EQ)) {
     if (CodeObjArg->getOption().getID() ==
         options::OPT_mno_code_object_v3_legacy) {
-      CodeObjVer = 2;
+      return 2;
     } else if (CodeObjArg->getOption().getID() ==
                options::OPT_mcode_object_v3_legacy) {
-      CodeObjVer = 3;
+      return 3;
     } else {
+      unsigned CodeObjVer;
       StringRef(CodeObjArg->getValue()).getAsInteger(0, CodeObjVer);
+      return (int)CodeObjVer;
     }
   }
-  return CodeObjVer;
+  return -1;
+}
+
+unsigned tools::getAMDGPUCodeObjectVersion(const Driver &D,
+                                           const llvm::opt::ArgList &Args) {
+  int Req = getAMDGPURequestedCodeObjectVersion(D, Args);
+  if (Req < 0) {
+    return 4; // default
+  } else {
+    return (unsigned)Req;
+  }
 }
 
 void tools::addMachineOutlinerArgs(const Driver &D,
Index: clang/lib/Driver/ToolChains/Clang.cpp
===================================================================
--- clang/lib/Driver/ToolChains/Clang.cpp
+++ clang/lib/Driver/ToolChains/Clang.cpp
@@ -1114,11 +1114,19 @@
 static void handleAMDGPUCodeObjectVersionOptions(const Driver &D,
                                                  const ArgList &Args,
                                                  ArgStringList &CmdArgs) {
-  unsigned CodeObjVer = getAMDGPUCodeObjectVersion(D, Args);
-  CmdArgs.insert(CmdArgs.begin() + 1,
-                 Args.MakeArgString(Twine("--amdhsa-code-object-version=") +
-                                    Twine(CodeObjVer)));
-  CmdArgs.insert(CmdArgs.begin() + 1, "-mllvm");
+  // If no version was requested by the user, use the default value from the
+  // back end. This is consistent with the value returned from
+  // getAMDGPUCodeObjectVersion. This lets clang emit IR for amdgpu without
+  // requiring the corresponding llvm to have the AMDGPU target enabled,
+  // provided the user (e.g. front end tests) can use the default.
+  int MaybeCodeObjVer = getAMDGPURequestedCodeObjectVersion(D, Args);
+  if (MaybeCodeObjVer >= 0) {
+    unsigned CodeObjVer = (unsigned)MaybeCodeObjVer;
+    CmdArgs.insert(CmdArgs.begin() + 1,
+                   Args.MakeArgString(Twine("--amdhsa-code-object-version=") +
+                                      Twine(CodeObjVer)));
+    CmdArgs.insert(CmdArgs.begin() + 1, "-mllvm");
+  }
 }
 
 void Clang::AddPreprocessingOptions(Compilation &C, const JobAction &JA,
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