Move demangling utility to stdio

Closes #848

third_party/libcxx/cxxabi.h

@@ -1,55 +0,0 @@
-#ifndef _CXXABI_H
-#define _CXXABI_H 1
-
-#include "third_party/libcxx/cstddef"
-
-namespace abi {
-
-   /**
-   *  @brief Demangling routine.
-   *  ABI-mandated entry point in the C++ runtime library for demangling.
-   *
-   *  @param __mangled_name A NUL-terminated character string
-   *  containing the name to be demangled.
-   *
-   *  @param __output_buffer A region of memory, allocated with
-   *  malloc, of @a *__length bytes, into which the demangled name is
-   *  stored.  If @a __output_buffer is not long enough, it is
-   *  expanded using realloc.  @a __output_buffer may instead be null;
-   *  in that case, the demangled name is placed in a region of memory
-   *  allocated with malloc.
-   *
-   *  @param __length If @a __length is non-null, the length of the
-   *  buffer containing the demangled name is placed in @a *__length.
-   *
-   *  @param __status If @a __status is non-null, @a *__status is set to
-   *  one of the following values:
-   *   0: The demangling operation succeeded.
-   *  -1: A memory allocation failure occurred.
-   *  -2: @a mangled_name is not a valid name under the C++ ABI mangling rules.
-   *  -3: One of the arguments is invalid.
-   *
-   *  @return A pointer to the start of the NUL-terminated demangled
-   *  name, or a null pointer if the demangling fails.  The caller is
-   *  responsible for deallocating this memory using @c free.
-   *
-   *  The demangling is performed using the C++ ABI mangling rules,
-   *  with GNU extensions. For example, this function is used in
-   *  __gnu_cxx::__verbose_terminate_handler.
-   *
-   *  See https://gcc.gnu.org/onlinedocs/libstdc++/manual/ext_demangling.html
-   *  for other examples of use.
-   *
-   *  @note The same demangling functionality is available via
-   *  libiberty (@c <libiberty/demangle.h> and @c libiberty.a) in GCC
-   *  3.1 and later, but that requires explicit installation (@c
-   *  --enable-install-libiberty) and uses a different API, although
-   *  the ABI is unchanged.
-   */
-  extern "C" char*
-  __cxa_demangle(const char* __mangled_name, char* __output_buffer,
-		 size_t* __length, int* __status);
-
-}
-
-#endif

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)
-