[PATCH] autoconf: Build libClang-Version.so with --enable-shared

[Tom Stellard]

This patch just adds support for building and installing the shared
library.  All the tools still link against the static libraries.
---
 tools/Makefile             |   4 ++
 tools/clang-shlib/Makefile | 116 +++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 120 insertions(+)
 create mode 100644 tools/clang-shlib/Makefile

diff --git a/tools/Makefile b/tools/Makefile
index 2ee1299..55c19c3 100644
--- a/tools/Makefile
+++ b/tools/Makefile
@@ -23,6 +23,10 @@ ifeq ($(ENABLE_CLANG_ARCMT), 1)
   PARALLEL_DIRS += arcmt-test
 endif
 
+ifeq ($(ENABLE_SHARED), 1)
+  DIRS += clang-shlib
+endif
+
 # Recurse into the extra repository of tools if present.
 OPTIONAL_PARALLEL_DIRS := extra
 
diff --git a/tools/clang-shlib/Makefile b/tools/clang-shlib/Makefile
new file mode 100644
index 0000000..947259a
--- /dev/null
+++ b/tools/clang-shlib/Makefile
@@ -0,0 +1,116 @@
+##===- tools/shlib/Makefile --------------------------------*- Makefile -*-===##
+# 
+#                     The LLVM Compiler Infrastructure
+#
+# This file is distributed under the University of Illinois Open Source
+# License. See LICENSE.TXT for details.
+# 
+##===----------------------------------------------------------------------===##
+
+CLANG_LEVEL := ../../
+
+LIBRARYNAME = clang-$(LLVM_VERSION_MAJOR).$(LLVM_VERSION_MINOR)$(LLVM_VERSION_SUFFIX)
+LIBRARYALIASNAME = clang-$(LLVMVersion)
+
+NO_BUILD_ARCHIVE := 1
+LINK_LIBS_IN_SHARED := 1
+SHARED_LIBRARY := 1
+SHARED_ALIAS := 1
+
+include $(CLANG_LEVEL)/Makefile
+
+ifeq ($(HOST_OS), $(filter $(HOST_OS), Cygwin MingW))
+  EXPORTED_SYMBOL_FILE = $(ObjDir)/$(LIBRARYNAME).exports
+
+  ifeq (1,$(ENABLE_EMBED_STDCXX))
+    # It is needed to force static-stdc++.a linked.
+    SHLIB_FRAG_NAMES += stdc++.a.o
+  endif
+
+endif
+
+# Include all archives in libclang.(so|dylib) except the ones that have
+# their own dynamic libraries and TableGen.
+Archives := $(wildcard $(LibDir)/libclang*.a)
+SharedLibraries := $(wildcard $(LibDir)/libclang*$(SHLIBEXT))
+IncludeInLibLlvm := $(Archives)
+LLVMLibsOptions := $(IncludeInLibLlvm:$(LibDir)/lib%.a=-l%)
+LLVMLibsPaths   := $(IncludeInLibLlvm)
+
+$(LibName.SO): $(LLVMLibsPaths)
+
+ifeq ($(HOST_OS),Darwin)
+    # set dylib internal version number to llvmCore submission number
+    ifdef LLVM_SUBMIT_VERSION
+        LLVMLibsOptions := $(LLVMLibsOptions) -Wl,-current_version \
+                        -Wl,$(LLVM_SUBMIT_VERSION).$(LLVM_SUBMIT_SUBVERSION) \
+                        -Wl,-compatibility_version -Wl,1
+    endif
+    # Include everything from the .a's into the shared library.
+    LLVMLibsOptions    := $(LLVMLibsOptions) -all_load
+endif
+
+ifeq ($(HOST_OS), $(filter $(HOST_OS), DragonFly Linux FreeBSD GNU/kFreeBSD OpenBSD GNU Bitrig))
+    # Include everything from the .a's into the shared library.
+    LLVMLibsOptions := -Wl,--whole-archive $(LLVMLibsOptions) \
+                       -Wl,--no-whole-archive
+endif
+
+ifeq ($(HOST_OS), $(filter $(HOST_OS), DragonFly Linux FreeBSD GNU/kFreeBSD GNU))
+    # Add soname to the library.
+    LLVMLibsOptions += -Wl,--soname,lib$(LIBRARYNAME)$(SHLIBEXT)
+endif
+
+ifeq ($(HOST_OS), $(filter $(HOST_OS), Linux GNU GNU/kFreeBSD))
+    # Don't allow unresolved symbols.
+    LLVMLibsOptions += -Wl,--no-undefined
+endif
+
+ifeq ($(HOST_OS),SunOS)
+    # add -z allextract ahead of other libraries on Solaris
+    LLVMLibsOptions := -Wl,-z -Wl,allextract $(LLVMLibsOptions)
+endif
+
+ifeq ($(HOST_OS), $(filter $(HOST_OS), Cygwin MingW))
+
+SHLIB_STUBS := $(addprefix $(ObjDir)/, $(SHLIB_FRAG_NAMES))
+SHLIB_FRAGS := $(patsubst %.a.o, $(ObjDir)/%.syms.txt, $(LIBRARYNAME).a.o $(SHLIB_FRAG_NAMES))
+LLVMLibsOptions := $(SHLIB_STUBS) $(LLVMLibsOptions)
+
+$(LibName.SO): $(SHLIB_STUBS)
+
+%.syms.txt: %.a.o
+	$(Echo) Collecting global symbols of $(notdir $*)
+	$(Verb) $(NM_PATH) -g $< > $@
+
+$(ObjDir)/$(LIBRARYNAME).exports: $(SHLIB_FRAGS) $(ObjDir)/.dir
+	$(Echo) Generating exports for $(LIBRARYNAME)
+	$(Verb) ($(SED) -n \
+			-e "s/^.* T _\([^.][^.]*\)$$/\1/p" \
+			-e "s/^.* [BDR] _\([^.][^.]*\)$$/\1 DATA/p" \
+			$(SHLIB_FRAGS) \
+		 | sort -u) > $@
+
+$(ObjDir)/$(LIBRARYNAME).a.o: $(LLVMLibsPaths) $(ObjDir)/.dir
+	$(Echo) Linking all LLVMLibs together for $(LIBRARYNAME)
+	$(Verb) $(Link) -nostartfiles -Wl,-r -nodefaultlibs -o $@ \
+			-Wl,--whole-archive $(LLVMLibsPaths) \
+			-Wl,--no-whole-archive
+
+$(ObjDir)/stdc++.a.o: $(ObjDir)/.dir
+	$(Echo) Linking all libs together for static libstdc++.a
+	$(Verb) $(Link) -nostartfiles -Wl,-r -nodefaultlibs -o $@ \
+			-Wl,--whole-archive -lstdc++ \
+			-Wl,--no-whole-archive
+# FIXME: workaround to invalidate -lstdc++
+	$(Echo) Making dummy -lstdc++ to lib
+	$(Verb) $(AR) rc $(ToolDir)/libstdc++.dll.a
+# FIXME: Is install-local needed?
+
+clean-local::
+	$(Verb) $(RM) -f $(ToolDir)/libstdc++.dll.a
+
+endif
+
+LLVMLibsOptions += -lLLVM-$(LLVM_VERSION_MAJOR).$(LLVM_VERSION_MINOR)$(LLVM_VERSION_SUFFIX)
+
-- 
1.8.1.5