[gn build] Manually port dbed061b

llvm/utils/gn/secondary/llvm/include/llvm/Config/BUILD.gn

@@ -337,6 +337,7 @@ write_cmake_config("llvm-config") {
     "LLVM_NATIVE_TARGET=1",
     "LLVM_NATIVE_TARGETINFO=1",
     "LLVM_NATIVE_TARGETMC=1",
+    "LLVM_NATIVE_TARGETMCA=1",
 
     # FIXME: Set to 1 on mac once the 10.14 SDK is in common use.
     "LLVM_SUPPORT_XCODE_SIGNPOSTS=",
@@ -431,6 +432,12 @@ write_target_def_file("Targets.def") {
   value = "LLVM_TARGET"
 }
 
+write_target_def_file("TargetMCAs.def") {
+  key = "LLVM_ENUM_TARGETMCAS"
+  value = "LLVM_TARGETMCA"
+  all_targets = []
+}
+
 group("write_target_def_files") {
   visibility = [
     "//llvm/lib/Support",
@@ -440,6 +447,7 @@ group("write_target_def_files") {
     ":AsmParsers.def",
     ":AsmPrinters.def",
     ":Disassemblers.def",
+    ":TargetMCAs.def",
     ":Targets.def",
   ]
 }

llvm/utils/gn/secondary/llvm/lib/Target/AMDGPU/BUILD.gn

@@ -241,6 +241,7 @@ group("AMDGPU") {
     ":LLVMAMDGPUCodeGen",
     "AsmParser",
     "Disassembler",
+    "MCA",
     "MCTargetDesc",
     "TargetInfo",
     "Utils",

llvm/utils/gn/secondary/llvm/lib/Target/AMDGPU/MCA/BUILD.gn

@@ -0,0 +1,9 @@
+static_library("MCA") {
+  output_name = "LLVMAMDGPUTargetMCA"
+  deps = [
+    "//llvm/lib/Target/AMDGPU/MCTargetDesc",
+    "//llvm/lib/Target/AMDGPU/Utils",
+  ]
+  include_dirs = [ ".." ]
+  sources = [ "AMDGPUCustomBehaviour.cpp" ]
+}

llvm/utils/gn/secondary/llvm/tools/llvm-mca/BUILD.gn

@@ -33,8 +33,4 @@ executable("llvm-mca") {
     "llvm-mca.cpp",
   ]
   defines = []
-  if (llvm_build_AMDGPU) {
-    deps += [ "//llvm/tools/llvm-mca/lib/AMDGPU" ]
-    defines += [ "HAS_AMDGPU" ]
-  }
 }

llvm/utils/gn/secondary/llvm/tools/llvm-mca/lib/AMDGPU/BUILD.gn

@@ -1,15 +0,0 @@
-static_library("AMDGPU") {
-  output_name = "LLVMMCACustomBehaviourAMDGPU"
-  deps = [
-    "//llvm/lib/IR",
-    "//llvm/lib/Support",
-    "//llvm/lib/Target/AMDGPU",
-
-    # llvm-mca/libAMDGPU reaches inside the Target/AMDGPU tablegen internals
-    # and must depend on these Target/AMDGPU-internal build targets.
-    "//llvm/lib/Target/AMDGPU/MCTargetDesc",
-    "//llvm/lib/Target/AMDGPU/Utils",
-  ]
-  include_dirs = [ "//llvm/lib/Target/AMDGPU" ]
-  sources = [ "AMDGPUCustomBehaviour.cpp" ]
-}