[PATCH 1/2] (header usage fix) remove unused system header includes

[Szabolcs Nagy <szabolcs dot nagy at arm dot com>]

These headers include "system.h" which already includes
<new> and <string.h> so including them after "system.h"
is a noop and including them before may cause problems
if they depend on gcc macros from system.h.

ipa-icf-gimple.c includes <list> after system.h which
poisons various libc symbols which may cause problems
and it is not used at all.

Tested together with PATCH 2/2.

OK for trunk?

gcc/ChangeLog:

2016-04-22  Szabolcs Nagy  <szabolcs.nagy@arm.com>

	* auto-profile.c: Remove <string.h> include.
	* ipa-icf-gimple.c: Remove <list> include.
	* diagnostic.c: Remove <new> include.
	* genmatch.c: Likewise.
	* pretty-print.c: Likewise.
	* toplev.c: Likewise
	* c/c-objc-common.c: Likewise.
	* cp/error.c: Likewise.
	* fortran/error.c: Likewise.

diff --git a/gcc/auto-profile.c b/gcc/auto-profile.c
index 5c0640a..0c726bd 100644
--- a/gcc/auto-profile.c
+++ b/gcc/auto-profile.c
@@ -32,7 +32,6 @@ along with GCC; see the file COPYING3.  If not see
 #include "gcov-io.h"
 #include "diagnostic-core.h"
 
-#include <string.h>
 #include <map>
 #include <set>
 
diff --git a/gcc/c/c-objc-common.c b/gcc/c/c-objc-common.c
index 18247af..20dc024 100644
--- a/gcc/c/c-objc-common.c
+++ b/gcc/c/c-objc-common.c
@@ -27,8 +27,6 @@ along with GCC; see the file COPYING3.  If not see
 #include "langhooks.h"
 #include "c-objc-common.h"
 
-#include <new>                          // For placement new.
-
 static bool c_tree_printer (pretty_printer *, text_info *, const char *,
 			    int, bool, bool, bool);
 
diff --git a/gcc/cp/error.c b/gcc/cp/error.c
index aa5fd41..7d70f89 100644
--- a/gcc/cp/error.c
+++ b/gcc/cp/error.c
@@ -31,8 +31,6 @@ along with GCC; see the file COPYING3.  If not see
 #include "ubsan.h"
 #include "internal-fn.h"
 
-#include <new>                    // For placement-new.
-
 #define pp_separate_with_comma(PP) pp_cxx_separate_with (PP, ',')
 #define pp_separate_with_semicolon(PP) pp_cxx_separate_with (PP, ';')
 
diff --git a/gcc/diagnostic.c b/gcc/diagnostic.c
index 6a679cb..8106172 100644
--- a/gcc/diagnostic.c
+++ b/gcc/diagnostic.c
@@ -40,8 +40,6 @@ along with GCC; see the file COPYING3.  If not see
 # include <sys/ioctl.h>
 #endif
 
-#include <new>                     // For placement new.
-
 #define pedantic_warning_kind(DC)			\
   ((DC)->pedantic_errors ? DK_ERROR : DK_WARNING)
 #define permissive_error_kind(DC) ((DC)->permissive ? DK_WARNING : DK_ERROR)
diff --git a/gcc/fortran/error.c b/gcc/fortran/error.c
index 003702b..6cfe019 100644
--- a/gcc/fortran/error.c
+++ b/gcc/fortran/error.c
@@ -34,8 +34,6 @@ along with GCC; see the file COPYING3.  If not see
 #include "diagnostic-color.h"
 #include "tree-diagnostic.h" /* tree_diagnostics_defaults */
 
-#include <new> /* For placement-new */
-
 static int suppress_errors = 0;
 
 static bool warnings_not_errors = false;
diff --git a/gcc/genmatch.c b/gcc/genmatch.c
index 1f5f45c..ce964fa 100644
--- a/gcc/genmatch.c
+++ b/gcc/genmatch.c
@@ -22,7 +22,6 @@ along with GCC; see the file COPYING3.  If not see
 <http://www.gnu.org/licenses/>.  */
 
 #include "bconfig.h"
-#include <new>
 #include "system.h"
 #include "coretypes.h"
 #include <cpplib.h>
diff --git a/gcc/ipa-icf-gimple.c b/gcc/ipa-icf-gimple.c
index 69db0d3..9e3c862 100644
--- a/gcc/ipa-icf-gimple.c
+++ b/gcc/ipa-icf-gimple.c
@@ -35,7 +35,6 @@ along with GCC; see the file COPYING3.  If not see
 #include "fold-const.h"
 #include "gimple-iterator.h"
 #include "ipa-utils.h"
-#include <list>
 #include "tree-eh.h"
 #include "builtins.h"
 
diff --git a/gcc/pretty-print.c b/gcc/pretty-print.c
index acb89e6..49e1cb9 100644
--- a/gcc/pretty-print.c
+++ b/gcc/pretty-print.c
@@ -25,8 +25,6 @@ along with GCC; see the file COPYING3.  If not see
 #include "pretty-print.h"
 #include "diagnostic-color.h"
 
-#include <new>                    // For placement-new.
-
 #if HAVE_ICONV
 #include <iconv.h>
 #endif
diff --git a/gcc/toplev.c b/gcc/toplev.c
index c480bfc..8979d26 100644
--- a/gcc/toplev.c
+++ b/gcc/toplev.c
@@ -87,8 +87,6 @@ along with GCC; see the file COPYING3.  If not see
 #include "xcoffout.h"		/* Needed for external data declarations. */
 #endif
 
-#include <new>
-
 static void general_init (const char *, bool);
 static void do_compile ();
 static void process_options (void);