[PATCH] [make & configure] Don't strip leading underscore on Win64

[Keno Fischer]

Unlike the win32 abi, the win64 abi doesn't have leading underscores in symbols, so stripping them from the nm output causes symbols without leading underscores to not appear at all and symbols with leading underscores to be missing said underscore, causing an error when attempting to compile the shared library. This fixes that.

http://reviews.llvm.org/D5036

Files:
  tools/llvm-shlib/Makefile

Index: tools/llvm-shlib/Makefile
===================================================================
--- tools/llvm-shlib/Makefile
+++ tools/llvm-shlib/Makefile
@@ -88,11 +88,19 @@
 
 $(ObjDir)/$(LIBRARYNAME).exports: $(SHLIB_FRAGS) $(ObjDir)/.dir
 	$(Echo) Generating exports for $(LIBRARYNAME)
+ifeq ($(ARCH),x86_64)
+	$(Verb) ($(SED) -n \
+			-e "s/^.* T \([^.][^.]*\)$$/\1/p" \
+			-e "s/^.* [BDR] \([^.][^.]*\)$$/\1 DATA/p" \
+			$(SHLIB_FRAGS) \
+		 | sort -u) > $@
+else
 	$(Verb) ($(SED) -n \
 			-e "s/^.* T _\([^.][^.]*\)$$/\1/p" \
 			-e "s/^.* [BDR] _\([^.][^.]*\)$$/\1 DATA/p" \
 			$(SHLIB_FRAGS) \
 		 | sort -u) > $@
+endif
 
 $(ObjDir)/$(LIBRARYNAME).a.o: $(LLVMLibsPaths) $(ObjDir)/.dir
 	$(Echo) Linking all LLVMLibs together for $(LIBRARYNAME)
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