system.h [...]: Wrap C function declarations in extern "C".

	gcc:
	* system.h [__cplusplus]: Wrap C function declarations in extern "C".

	include:
	* xregex.h (regoff_t): Define.

From-SVN: r176747

gcc/ChangeLog

+2011-07-25  Rainer Orth  <ro@CeBiTec.Uni-Bielefeld.DE>
+
+	* system.h [__cplusplus]: Wrap C function declarations in extern "C".
+
 2011-07-25  Richard Guenther  <rguenther@suse.de>
 
 	PR tree-optimization/49822

gcc/system.h

@@ -90,6 +90,10 @@ along with GCC; see the file COPYING3.  If not see
 #  define fputc(C, Stream) fputc_unlocked (C, Stream)
 # endif
 
+#ifdef __cplusplus
+extern "C" {
+#endif
+
 # ifdef HAVE_CLEARERR_UNLOCKED
 #  undef clearerr
 #  define clearerr(Stream) clearerr_unlocked (Stream)
@@ -170,6 +174,10 @@ extern int fprintf_unlocked (FILE *, const char *, ...);
 #  endif
 # endif
 
+#ifdef __cplusplus
+}
+#endif
+
 #endif
 
 /* ??? Glibc's fwrite/fread_unlocked macros cause
@@ -390,6 +398,10 @@ extern int errno;
    here.  These checks will be in the undefined state while configure
    is running so be careful to test "defined (HAVE_DECL_*)".  */
 
+#ifdef __cplusplus
+extern "C" {
+#endif
+
 #if defined (HAVE_DECL_ATOF) && !HAVE_DECL_ATOF
 extern double atof (const char *);
 #endif
@@ -430,10 +442,18 @@ extern void *sbrk (int);
 extern char *strstr (const char *, const char *);
 #endif
 
+#ifdef __cplusplus
+}
+#endif
+
 #ifdef HAVE_MALLOC_H
 #include <malloc.h>
 #endif
 
+#ifdef __cplusplus
+extern "C" {
+#endif
+
 #if defined (HAVE_DECL_MALLOC) && !HAVE_DECL_MALLOC
 extern void *malloc (size_t);
 #endif
@@ -446,6 +466,10 @@ extern void *calloc (size_t, size_t);
 extern void *realloc (void *, size_t);
 #endif
 
+#ifdef __cplusplus
+}
+#endif
+
 #ifdef HAVE_STDINT_H
 #include <stdint.h>
 #endif
@@ -454,6 +478,10 @@ extern void *realloc (void *, size_t);
 #include <inttypes.h>
 #endif
 
+#ifdef __cplusplus
+extern "C" {
+#endif
+
 /* If the system doesn't provide strsignal, we get it defined in
    libiberty but no declaration is supplied.  */
 #if !defined (HAVE_STRSIGNAL) \
@@ -493,6 +521,10 @@ extern int snprintf (char *, size_t, const char *, ...);
 extern int vsnprintf(char *, size_t, const char *, va_list);
 #endif
 
+#ifdef __cplusplus
+}
+#endif
+
 /* 1 if we have C99 designated initializers.  */
 #if !defined(HAVE_DESIGNATED_INITIALIZERS)
 #define HAVE_DESIGNATED_INITIALIZERS \

include/ChangeLog

+2011-07-25  Rainer Orth  <ro@CeBiTec.Uni-Bielefeld.DE>
+
+	* xregex.h (regoff_t): Define.
+
 2011-07-22  Jakub Jelinek  <jakub@redhat.com>
 
 	* dwarf2.h (DW_AT_GNU_macros): New.

include/xregex.h

@@ -8,6 +8,7 @@
 #  define regexec xregexec
 #  define regcomp xregcomp
 #  define regerror xregerror
+#  define regoff_t xregoff_t
 #  define re_set_registers xre_set_registers
 #  define re_match_2 xre_match_2
 #  define re_match xre_match