Make dynamic LLVMC plugins work on Windows (finally!).

Implemented by making lib/CompilerDriver a shared library that holds all the
global static data (CommandLine options, plugin registry) that we unfortunately
have to live with.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@74417 91177308-0d34-0410-b5e6-96231b3b80d8

Makefile.rules

@@ -200,6 +200,7 @@ ifdef LLVMC_PLUGIN
 LIBRARYNAME := $(patsubst %,plugin_llvmc_%,$(LLVMC_PLUGIN))
 CPP.Flags += -DLLVMC_PLUGIN_NAME=$(LLVMC_PLUGIN)
 REQUIRES_EH := 1
+LD.Flags += -lCompilerDriver
 
 # Build a dynamic library if the user runs `make` directly from the plugin
 # directory.
@@ -217,9 +218,8 @@ endif # LLVMC_PLUGIN
 ifdef LLVMC_BASED_DRIVER
 
 TOOLNAME = $(LLVMC_BASED_DRIVER)
-LLVMLIBS = CompilerDriver.a
-LINK_COMPONENTS = support system
 REQUIRES_EH := 1
+LD.Flags += -lCompilerDriver
 
 # Preprocessor magic that generates references to static variables in built-in
 # plugins.

include/llvm/CompilerDriver/Main.inc

@@ -24,8 +24,6 @@
 #include "llvm/CompilerDriver/Plugin.h"
 
 #include "llvm/System/Path.h"
-#include "llvm/Support/CommandLine.h"
-#include "llvm/Support/PluginLoader.h"
 
 #include <iostream>
 #include <stdexcept>
@@ -35,42 +33,6 @@ namespace cl = llvm::cl;
 namespace sys = llvm::sys;
 using namespace llvmc;
 
-// Built-in command-line options.
-// External linkage here is intentional.
-
-cl::list<std::string> InputFilenames(cl::Positional, cl::desc("<input file>"),
-                                     cl::ZeroOrMore);
-cl::opt<std::string> OutputFilename("o", cl::desc("Output file name"),
-                                    cl::value_desc("file"), cl::Prefix);
-cl::list<std::string> Languages("x",
-          cl::desc("Specify the language of the following input files"),
-          cl::ZeroOrMore);
-cl::opt<bool> DryRun("dry-run",
-                     cl::desc("Only pretend to run commands"));
-cl::opt<bool> VerboseMode("v",
-                          cl::desc("Enable verbose mode"));
-
-cl::opt<bool> CheckGraph("check-graph",
-                         cl::desc("Check the compilation graph for errors"),
-                         cl::Hidden);
-cl::opt<bool> WriteGraph("write-graph",
-                         cl::desc("Write compilation-graph.dot file"),
-                         cl::Hidden);
-cl::opt<bool> ViewGraph("view-graph",
-                         cl::desc("Show compilation graph in GhostView"),
-                         cl::Hidden);
-
-cl::opt<SaveTempsEnum::Values> SaveTemps
-("save-temps", cl::desc("Keep temporary files"),
- cl::init(SaveTempsEnum::Unset),
- cl::values(clEnumValN(SaveTempsEnum::Obj, "obj",
-                       "Save files in the directory specified with -o"),
-            clEnumValN(SaveTempsEnum::Cwd, "cwd",
-                       "Use current working directory"),
-            clEnumValN(SaveTempsEnum::Obj, "", "Same as 'cwd'"),
-            clEnumValEnd),
- cl::ValueOptional);
-
 namespace {
 
   sys::Path getTempDir() {

lib/CompilerDriver/BuiltinOptions.cpp

@@ -0,0 +1,52 @@
+//===--- BuiltinOptions.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.
+//
+//===----------------------------------------------------------------------===//
+//
+//  Definitions of all global command-line option variables.
+//
+//===----------------------------------------------------------------------===//
+
+#include "llvm/CompilerDriver/BuiltinOptions.h"
+#include "llvm/Support/PluginLoader.h"
+
+namespace cl = llvm::cl;
+
+// External linkage here is intentional.
+
+cl::list<std::string> InputFilenames(cl::Positional, cl::desc("<input file>"),
+                                     cl::ZeroOrMore);
+cl::opt<std::string> OutputFilename("o", cl::desc("Output file name"),
+                                    cl::value_desc("file"), cl::Prefix);
+cl::list<std::string> Languages("x",
+          cl::desc("Specify the language of the following input files"),
+          cl::ZeroOrMore);
+cl::opt<bool> DryRun("dry-run",
+                     cl::desc("Only pretend to run commands"));
+cl::opt<bool> VerboseMode("v",
+                          cl::desc("Enable verbose mode"));
+
+cl::opt<bool> CheckGraph("check-graph",
+                         cl::desc("Check the compilation graph for errors"),
+                         cl::Hidden);
+cl::opt<bool> WriteGraph("write-graph",
+                         cl::desc("Write compilation-graph.dot file"),
+                         cl::Hidden);
+cl::opt<bool> ViewGraph("view-graph",
+                         cl::desc("Show compilation graph in GhostView"),
+                         cl::Hidden);
+
+cl::opt<SaveTempsEnum::Values> SaveTemps
+("save-temps", cl::desc("Keep temporary files"),
+ cl::init(SaveTempsEnum::Unset),
+ cl::values(clEnumValN(SaveTempsEnum::Obj, "obj",
+                       "Save files in the directory specified with -o"),
+            clEnumValN(SaveTempsEnum::Cwd, "cwd",
+                       "Use current working directory"),
+            clEnumValN(SaveTempsEnum::Obj, "", "Same as 'cwd'"),
+            clEnumValEnd),
+ cl::ValueOptional);

lib/CompilerDriver/Makefile

@@ -12,8 +12,22 @@ LEVEL = ../..
 # We don't want this library to appear in `llvm-config --libs` output, so its
 # name doesn't start with "LLVM".
 
-LIBRARYNAME = CompilerDriver
-LINK_COMPONENTS = support system
+LIBRARYNAME = libCompilerDriver
+LLVMLIBS = LLVMSupport.a LLVMSystem.a
+LOADABLE_MODULE := 1
 REQUIRES_EH := 1
 
 include $(LEVEL)/Makefile.common
+
+FullLibName = $(LIBRARYNAME)$(SHLIBEXT)
+
+# Copy the library to the bin dir so that llvmc can find it.
+all-local::
+	$(Echo) Copying $(BuildMode) Shared Library $(FullLibName) \
+	to $(ToolDir)
+	-$(Verb) $(CP) $(LibDir)/$(FullLibName) $(ToolDir)/
+
+clean-local::
+	$(Echo) Removing $(BuildMode) Shared Library $(FullLibName) \
+	from $(ToolDir)
+	-$(Verb) $(RM) -f $(ToolDir)/$(FullLibName)

lib/CompilerDriver/Tool.cpp

@@ -14,11 +14,17 @@
 #include "llvm/CompilerDriver/BuiltinOptions.h"
 #include "llvm/CompilerDriver/Tool.h"
 
+#include "llvm/ADT/StringExtras.h"
 #include "llvm/System/Path.h"
 
 using namespace llvm;
 using namespace llvmc;
 
+// SplitString is used by derived Tool classes.
+typedef void (*SplitStringFunPtr)(const std::string&,
+                                  std::vector<std::string>&, const char*);
+SplitStringFunPtr ForceLinkageSplitString = &llvm::SplitString;
+
 namespace {
   sys::Path MakeTempFile(const sys::Path& TempDir, const std::string& BaseName,
                          const std::string& Suffix) {