[Clang][Cmake] fix libtool duplicate member name warnings (#133619)

fixes #133199
 
PR #132252 Created a second file that shared `<TargetName>.cpp` in
`clang/lib/CodeGen/CMakeLists.txt`

For example There were two `AMDGPU.cpp`'s one in `TargetBuiltins` and
the other in `Targets`. Even though these were in different directories
`libtool` warns that it might not distinguish them because they share
the same base name.

There are two potential fixes. The easy fix is to rename one of them and
keep one cmake file. That solution though doesn't future proof this
problem in the event of a third `<TargetName>.cpp` and it seems teams
want to just use the target name

#132252 (comment).

The alternative fix is to seperate the cmake files into their own sub
directories. I chose to create static libraries. It might of been
possible to build an OBJECT, but I only saw examples of this in
compiler-rt and test directories so assumed there was a reason it wasn't
used.

Author: farzonl

clang/lib/CodeGen/CMakeLists.txt

@@ -116,45 +116,8 @@ add_clang_library(clangCodeGen
   PatternInit.cpp
   SanitizerMetadata.cpp
   SwiftCallingConv.cpp
-  TargetBuiltins/ARM.cpp
-  TargetBuiltins/AMDGPU.cpp
-  TargetBuiltins/Hexagon.cpp
-  TargetBuiltins/NVPTX.cpp
-  TargetBuiltins/PPC.cpp
-  TargetBuiltins/RISCV.cpp
-  TargetBuiltins/SPIR.cpp
-  TargetBuiltins/SystemZ.cpp
-  TargetBuiltins/WebAssembly.cpp
-  TargetBuiltins/X86.cpp
   TargetInfo.cpp
-  Targets/AArch64.cpp
-  Targets/AMDGPU.cpp
-  Targets/ARC.cpp
-  Targets/ARM.cpp
-  Targets/AVR.cpp
-  Targets/BPF.cpp
-  Targets/CSKY.cpp
-  Targets/DirectX.cpp
-  Targets/Hexagon.cpp
-  Targets/Lanai.cpp
-  Targets/LoongArch.cpp
-  Targets/M68k.cpp
-  Targets/MSP430.cpp
-  Targets/Mips.cpp
-  Targets/NVPTX.cpp
-  Targets/PNaCl.cpp
-  Targets/PPC.cpp
-  Targets/RISCV.cpp
-  Targets/SPIR.cpp
-  Targets/Sparc.cpp
-  Targets/SystemZ.cpp
-  Targets/TCE.cpp
-  Targets/VE.cpp
-  Targets/WebAssembly.cpp
-  Targets/X86.cpp
-  Targets/XCore.cpp
   VarBypassDetector.cpp
-
   DEPENDS
   vt_gen
   intrinsics_gen
@@ -170,4 +133,16 @@ add_clang_library(clangCodeGen
   clangFrontend
   clangLex
   clangSerialization
+  clangCodeGenTargetBuiltins
+  clangCodeGenTargets
+  )
+
+  target_include_directories(clangCodeGen
+    PUBLIC
+    ${CMAKE_CURRENT_SOURCE_DIR}
+    ${CMAKE_CURRENT_SOURCE_DIR}/TargetBuiltins
+    ${CMAKE_CURRENT_SOURCE_DIR}/Targets
   )
+  
+  add_subdirectory(TargetBuiltins)
+  add_subdirectory(Targets)

clang/lib/CodeGen/TargetBuiltins/AMDGPU.cpp

@@ -1,4 +1,4 @@
-//===------- AMDCPU.cpp - Emit LLVM Code for builtins ---------------------===//
+//===------- AMDGPU.cpp - Emit LLVM Code for builtins ---------------------===//
 //
 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
 // See https://llvm.org/LICENSE.txt for license information.

clang/lib/CodeGen/TargetBuiltins/CMakeLists.txt

@@ -0,0 +1,19 @@
+include_directories(${CMAKE_CURRENT_SOURCE_DIR}/..)
+
+add_clang_library(clangCodeGenTargetBuiltins STATIC
+  ARM.cpp
+  AMDGPU.cpp
+  Hexagon.cpp
+  NVPTX.cpp
+  PPC.cpp
+  RISCV.cpp
+  SPIR.cpp
+  SystemZ.cpp
+  WebAssembly.cpp
+  X86.cpp
+)
+
+target_link_libraries(clangCodeGenTargetBuiltins
+  PRIVATE
+  clangCodeGen
+)

clang/lib/CodeGen/Targets/CMakeLists.txt

@@ -0,0 +1,35 @@
+include_directories(${CMAKE_CURRENT_SOURCE_DIR}/..)
+
+add_clang_library(clangCodeGenTargets STATIC
+  AArch64.cpp
+  AMDGPU.cpp
+  ARC.cpp
+  ARM.cpp
+  AVR.cpp
+  BPF.cpp
+  CSKY.cpp
+  DirectX.cpp
+  Hexagon.cpp
+  Lanai.cpp
+  LoongArch.cpp
+  M68k.cpp
+  MSP430.cpp
+  Mips.cpp
+  NVPTX.cpp
+  PNaCl.cpp
+  PPC.cpp
+  RISCV.cpp
+  SPIR.cpp
+  Sparc.cpp
+  SystemZ.cpp
+  TCE.cpp
+  VE.cpp
+  WebAssembly.cpp
+  X86.cpp
+  XCore.cpp
+)
+
+target_link_libraries(clangCodeGenTargets
+  PRIVATE
+  clangCodeGen
+)