[PATCH] [libc++abi] Small #include directive cleanup

[Matthew Dempsky]

Since cxa_exception.cpp only needs <string> for std::memset, it can
instead include just <cstring>.  Also, cxa_demangle.cpp doesn't
actually need <algorithm>.


As a side effect of this cleanup, I'm able to build libc++abi on
OpenBSD using GCC 4.2.1 if I compile against libc++'s header files.
(Otherwise, libc++'s <algorithm> uses C++11 syntax that GCC 4.2.1
can't handle, and <string> includes <algorithm> too.  And libstdc++
4.2.1's headers are missing some functionality needed by libc++abi.)

Not sure if that's really interesting since Clang is still needed to
build libc++, but removing unnecessary includes seems worthwhile
either way.


Index: src/cxa_exception.cpp
===================================================================
--- src/cxa_exception.cpp	(revision 183600)
+++ src/cxa_exception.cpp	(working copy)
@@ -15,7 +15,7 @@
 
 #include <exception>        // for std::terminate
 #include <cstdlib>          // for malloc, free
-#include <string>           // for memset
+#include <cstring>          // for memset
 #include <pthread.h>
 
 #include "cxa_exception.hpp"
Index: src/cxa_demangle.cpp
===================================================================
--- src/cxa_demangle.cpp	(revision 183602)
+++ src/cxa_demangle.cpp	(working copy)
@@ -14,7 +14,6 @@
 #include <ctype.h>
 #include <stdio.h>
 #include <new>
-#include <algorithm>
 #include <assert.h>
 
 #ifdef DEBUGGING