Move demangling utility to stdio

Closes #848

third_party/libcxx/libcxx.mk

@@ -67,7 +67,6 @@ THIRD_PARTY_LIBCXX_A_HDRS =					\
 	third_party/libcxx/ctype.h				\
 	third_party/libcxx/cwchar				\
 	third_party/libcxx/cwctype				\
-	third_party/libcxx/cxxabi.h				\
 	third_party/libcxx/deque				\
 	third_party/libcxx/errno.h				\
 	third_party/libcxx/exception				\
@@ -144,7 +143,6 @@ THIRD_PARTY_LIBCXX_A_SRCS_CC =					\
 	third_party/libcxx/chrono.cc				\
 	third_party/libcxx/condition_variable.cc		\
 	third_party/libcxx/condition_variable_destructor.cc	\
-	third_party/libcxx/demangle.cc	\
 	third_party/libcxx/exception.cc				\
 	third_party/libcxx/functional.cc			\
 	third_party/libcxx/future.cc				\
@@ -175,7 +173,6 @@ THIRD_PARTY_LIBCXX_A_SRCS =					\
 
 THIRD_PARTY_LIBCXX_A_OBJS =					\
 	$(THIRD_PARTY_LIBCXX_A_SRCS_S:%.S=o/$(MODE)/%.o)	\
-	$(THIRD_PARTY_LIBCXX_A_SRCS_C:%.c=o/$(MODE)/%.o)	\
 	$(THIRD_PARTY_LIBCXX_A_SRCS_CC:%.cc=o/$(MODE)/%.o)
 
 THIRD_PARTY_LIBCXX_A_CHECKS =					\
@@ -214,16 +211,6 @@ $(THIRD_PARTY_LIBCXX_A_OBJS): private				\
 			-ffunction-sections			\
 			-fdata-sections
 
-# Super gross! But I found no way to do -fno-error=permissive
-# this steps from the fact that demangle is a C++ file extension
-# but the source I copied was written in C.
-# The fix would be to go through all the casts and make them correct.
-o/$(MODE)/third_party/libcxx/demangle.o: private				\
-		CXXFLAGS +=							\
-			-fpermissive					\
-			-Wno-error
-
-
 THIRD_PARTY_LIBCXX_LIBS = $(foreach x,$(THIRD_PARTY_LIBCXX_ARTIFACTS),$($(x)))
 THIRD_PARTY_LIBCXX_SRCS = $(foreach x,$(THIRD_PARTY_LIBCXX_ARTIFACTS),$($(x)_SRCS))
 THIRD_PARTY_LIBCXX_HDRS = $(foreach x,$(THIRD_PARTY_LIBCXX_ARTIFACTS),$($(x)_HDRS))
@@ -235,4 +222,3 @@ THIRD_PARTY_LIBCXX_OBJS = $(foreach x,$(THIRD_PARTY_LIBCXX_ARTIFACTS),$($(x)_OBJ
 o/$(MODE)/third_party/libcxx: \
 	$(THIRD_PARTY_LIBCXX_CHECKS)	\
 	$(THIRD_PARTY_LIBCXX_A)
-