Build system tweaks to make it more convenient for the plugin authors.

Plugins can be now compiled in with a slight Makefile change.
For example, to compile the new Clang driver, use:

cd $LLVMC2_DIR
make TOOLNAME=ccc2 BUILTIN_PLUGINS=Clang

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@56967 91177308-0d34-0410-b5e6-96231b3b80d8

tools/llvmc2/AutoGenerated.cpp

@@ -1,15 +0,0 @@
-//===--- AutoGenerated.cpp - The LLVM Compiler Driver -----------*- C++ -*-===//
-//
-//                     The LLVM Compiler Infrastructure
-//
-// This file is distributed under the University of Illinois Open
-// Source License. See LICENSE.TXT for details.
-//
-//===----------------------------------------------------------------------===//
-//
-//  Auto-generated tool descriptions - implementation.
-//
-//===----------------------------------------------------------------------===//
-
-// The auto-generated file
-#include "AutoGenerated.inc"

tools/llvmc2/Makefile

@@ -6,24 +6,39 @@
 # Source License. See LICENSE.TXT for details.
 #
 ##===----------------------------------------------------------------------===##
+
+# Compiled-in plugins
+BUILTIN_PLUGINS = Base
+
 LEVEL = ../..
 TOOLNAME = llvmc2
-BUILT_SOURCES = AutoGenerated.inc
 LINK_COMPONENTS = support system
 REQUIRES_EH := 1
 
+ifneq ($(BUILTIN_PLUGINS),)
+
+export BUILTIN_LLVMC_PLUGIN=1
+USEDLIBS = $(patsubst %,LLVMC%,$(BUILTIN_PLUGINS))
+
+endif
+
 include $(LEVEL)/Makefile.common
 
-GRAPH=Graph.td
-$(GRAPH) : Common.td
-Graph.td : Tools.td
-TOOLS_SOURCE=$(GRAPH)
+TD_COMMON = $(wildcard $(LLVM_SRC_ROOT)/include/llvm/CompilerDriver/*.td)
 
-# TOFIX: integrate this part into Makefile.rules?
-# The degree of horrorshowness in that file is too much for me atm.
-$(ObjDir)/AutoGenerated.inc.tmp: $(TOOLS_SOURCE) $(ObjDir)/.dir $(TBLGEN)
-	$(Echo) "Building LLVMC configuration library with tblgen"
-	$(Verb) $(TableGen) -gen-llvmc -o $(call SYSPATH, $@) $<
+# There is probably a better way to do this: currently we enter the
+# subdirectory 2 times - the second time is not needed.
+# This probably also needs to be integrated into Makefile.rules.
+define PLUGIN_template
+PLUGIN_$(1)_SOURCES=$$(wildcard plugins/$(1)/*.cpp)
+PLUGIN_$(1)_TD_SOURCES=$$(wildcard plugins/$(1)/*.cpp)
 
-AutoGenerated.inc : $(ObjDir)/AutoGenerated.inc.tmp
-	$(Verb) $(CMP) -s $@ $< || $(CP) $< $@
+$$(LibDir)/LLVMC$(1).o: $$(PLUGIN_$(1)_SOURCES) $$(PLUGIN_$(1)_TD_SOURCES) \
+			$$(TD_COMMON)
+	@$$(MAKE) -C plugins/$(1)
+
+$$(RecursiveTargets) ::
+	@$$(MAKE) -C plugins/$(1) $$@
+endef
+
+$(foreach plugin,$(BUILTIN_PLUGINS),$(eval $(call PLUGIN_template,$(plugin))))

tools/llvmc2/plugins/Base/AutoGenerated.cpp

@@ -0,0 +1 @@
+#include "AutoGenerated.inc"

tools/llvmc2/plugins/Base/Base.td

@@ -11,8 +11,8 @@
 //
 //===----------------------------------------------------------------------===//
 
-include "Common.td"
-include "Tools.td"
+include "llvm/CompilerDriver/Common.td"
+include "llvm/CompilerDriver/Tools.td"
 
 // Toolchains
 

tools/llvmc2/plugins/Base/Makefile

@@ -0,0 +1,12 @@
+##===- tools/llvmc2/plugins/Base/Makefile ------------------*- Makefile -*-===##
+#
+#                     The LLVM Compiler Infrastructure
+#
+# This file is distributed under the University of Illinois Open Source
+# License. See LICENSE.TXT for details.
+#
+##===----------------------------------------------------------------------===##
+
+LLVMC_PLUGIN = Base
+
+include ../Makefile.common

tools/llvmc2/plugins/Clang/AutoGenerated.cpp

@@ -0,0 +1 @@
+#include "AutoGenerated.inc"

tools/llvmc2/plugins/Clang/Clang.td

@@ -1,11 +1,11 @@
 // A (first stab at a) replacement for the Clang's ccc script.
 // To compile, use this command:
-//    make TOOLNAME=ccc2 GRAPH=examples/Clang.td
+//    cd $LLVMC2_DIR
+//    make TOOLNAME=ccc2 BUILTIN_PLUGINS=Clang
 
-include "Common.td"
+include "llvm/CompilerDriver/Common.td"
 
 
-// TOFIX: Add an explicit option list for aliases and things like this.
 def Options : OptionList<[
 (switch_option "E",
     (help "Stop after the preprocessing stage, do not run the compiler"))

tools/llvmc2/plugins/Clang/Makefile

@@ -0,0 +1,13 @@
+##===- tools/llvmc2/plugins/Clang/Makefile -----------------*- Makefile -*-===##
+#
+#                     The LLVM Compiler Infrastructure
+#
+# This file is distributed under the University of Illinois Open Source
+# License. See LICENSE.TXT for details.
+#
+##===----------------------------------------------------------------------===##
+
+LLVMC_PLUGIN = Clang
+
+include ../Makefile.common
+

tools/llvmc2/plugins/Hello/Makefile

@@ -1,4 +1,4 @@
-##===- lib/Transforms/Hello/Makefile -----------------------*- Makefile -*-===##
+##===- tools/llvmc2/plugins/Hello/Makefile -----------------*- Makefile -*-===##
 #
 #                     The LLVM Compiler Infrastructure
 #
@@ -7,11 +7,6 @@
 #
 ##===----------------------------------------------------------------------===##
 
-LEVEL = ../../../..
-LIBRARYNAME = LLVMCHello
-LOADABLE_MODULE = 1
-REQUIRES_EH = 1
-USEDLIBS =
-
-include $(LEVEL)/Makefile.common
+LLVMC_PLUGIN = Hello
 
+include ../Makefile.common