Revert "[llvm-(min-)tblgen] Avoid redundant source compilation (llvm#…

…114494)"

This reverts commit f6cb569.

Buildbot failures such as https://lab.llvm.org/buildbot/#/builders/89/builds/13541:
```
/usr/bin/ld: utils/TableGen/Basic/CMakeFiles/obj.LLVMTableGenBasic.dir/ARMTargetDefEmitter.cpp.o: undefined reference to symbol '_ZN4llvm23EnableABIBreakingChecksE'
/usr/bin/ld: /home/tcwg-buildbot/worker/flang-aarch64-libcxx/build/./lib/libLLVMSupport.so.20.0git: error adding symbols: DSO missing from command line
```

Going to investigate.

llvm/utils/TableGen/Basic/CMakeLists.txt

@@ -9,15 +9,8 @@ set(LLVM_LINK_COMPONENTS
   )
 
 add_llvm_library(LLVMTableGenBasic OBJECT EXCLUDE_FROM_ALL DISABLE_LLVM_LINK_LLVM_DYLIB
-  ARMTargetDefEmitter.cpp
-  Attributes.cpp
   CodeGenIntrinsics.cpp
-  DirectiveEmitter.cpp
-  IntrinsicEmitter.cpp
-  RISCVTargetDefEmitter.cpp
   SDNodeProperties.cpp
-  TableGen.cpp
-  VTEmitter.cpp
 )
 
 # Users may include its headers as "Basic/*.h"

llvm/utils/TableGen/CMakeLists.txt

@@ -5,17 +5,20 @@ add_subdirectory(Basic)
 # code needed by the backends.
 add_subdirectory(Common)
 
+set(LLVM_LINK_COMPONENTS Support)
+
 # llvm-min-tablegen only contains a subset of backends necessary to
 # build llvm/include. It must not depend on TableGenCommon, as
 # TableGenCommon depends on this already to generate things such as
 # ValueType definitions.
-# Sources included in both, llvm-min-tblgen and llvm-tblgen, must be included
-# into LLVMTableGenBasic to avoid redundant compilation and problems with build
-# caches.
-# At least one source file must be included directly to avoid CMake problems.
-# E.g. CMake derives which linker to use from the types of sources added.
 add_tablegen(llvm-min-tblgen LLVM_HEADERS
-  llvm-min-tblgen.cpp
+  TableGen.cpp
+  ARMTargetDefEmitter.cpp
+  Attributes.cpp
+  DirectiveEmitter.cpp
+  IntrinsicEmitter.cpp
+  RISCVTargetDefEmitter.cpp
+  VTEmitter.cpp
   $<TARGET_OBJECTS:obj.LLVMTableGenBasic>
 
   PARTIAL_SOURCES_INTENDED
@@ -29,8 +32,10 @@ set(LLVM_LINK_COMPONENTS
 add_tablegen(llvm-tblgen LLVM
   DESTINATION "${LLVM_TOOLS_INSTALL_DIR}"
   EXPORT LLVM
+  ARMTargetDefEmitter.cpp
   AsmMatcherEmitter.cpp
   AsmWriterEmitter.cpp
+  Attributes.cpp
   CallingConvEmitter.cpp
   CodeEmitterGen.cpp
   CodeGenMapTable.cpp
@@ -43,6 +48,7 @@ add_tablegen(llvm-tblgen LLVM
   DecoderEmitter.cpp
   DFAEmitter.cpp
   DFAPacketizerEmitter.cpp
+  DirectiveEmitter.cpp
   DisassemblerEmitter.cpp
   DXILEmitter.cpp
   ExegesisEmitter.cpp
@@ -51,15 +57,18 @@ add_tablegen(llvm-tblgen LLVM
   GlobalISelEmitter.cpp
   InstrDocsEmitter.cpp
   InstrInfoEmitter.cpp
-  llvm-tblgen.cpp
+  IntrinsicEmitter.cpp
   MacroFusionPredicatorEmitter.cpp
   OptionParserEmitter.cpp
   OptionRSTEmitter.cpp
   PseudoLoweringEmitter.cpp
   RegisterBankEmitter.cpp
   RegisterInfoEmitter.cpp
+  RISCVTargetDefEmitter.cpp
   SearchableTableEmitter.cpp
   SubtargetEmitter.cpp
+  TableGen.cpp
+  VTEmitter.cpp
   WebAssemblyDisassemblerEmitter.cpp
   X86InstrMappingEmitter.cpp
   X86DisassemblerTables.cpp
@@ -70,8 +79,6 @@ add_tablegen(llvm-tblgen LLVM
   $<TARGET_OBJECTS:obj.LLVMTableGenBasic>
   $<TARGET_OBJECTS:obj.LLVMTableGenCommon>
 
-  PARTIAL_SOURCES_INTENDED
-
   DEPENDS
   intrinsics_gen # via llvm-min-tablegen
   )

llvm/utils/TableGen/Basic/IntrinsicEmitter.cpp → llvm/utils/TableGen/IntrinsicEmitter.cpp

@@ -10,8 +10,8 @@
 //
 //===----------------------------------------------------------------------===//
 
-#include "CodeGenIntrinsics.h"
-#include "SequenceToOffsetTable.h"
+#include "Basic/CodeGenIntrinsics.h"
+#include "Basic/SequenceToOffsetTable.h"
 #include "llvm/ADT/STLExtras.h"
 #include "llvm/ADT/SmallVector.h"
 #include "llvm/ADT/StringRef.h"

llvm/utils/TableGen/Basic/TableGen.cpp → llvm/utils/TableGen/TableGen.cpp

@@ -6,12 +6,10 @@
 //
 //===----------------------------------------------------------------------===//
 //
-// This file contains the global defintions (mostly command line parameters)
-// shared between llvm-tblgen and llvm-min-tblgen.
+// This file contains the main function for LLVM's TableGen.
 //
 //===----------------------------------------------------------------------===//
 
-#include "TableGen.h"
 #include "llvm/ADT/StringRef.h"
 #include "llvm/Support/CommandLine.h"
 #include "llvm/Support/InitLLVM.h"
@@ -76,7 +74,7 @@ static TableGen::Emitter::Opt X[] = {
     {"print-sets", printSets, "Print expanded sets for testing DAG exprs"},
 };
 
-int tblgen_main(int argc, char **argv) {
+int main(int argc, char **argv) {
   InitLLVM X(argc, argv);
   cl::ParseCommandLineOptions(argc, argv);