change for gcc v10

change to ps.c to remote pid size check
change to sfputr.c to disable use of memccpy
change to cmdarg.c to adjust argument length calc. due to failures in tw

Author: Lefteris Koutsofios

src/cmd/INIT/make.probe

@@ -45,6 +45,7 @@ case `gcc -v 2>&1 | egrep gcc.version` in
 *version' '7*) probe_shared_nostart= ;;
 *version' '8*) probe_shared_nostart= ;;
 *version' '9*) probe_shared_nostart= ;;
+*version' '10*) probe_shared_nostart= ;;
 esac
 probe_shared_registry='"-update_registry $probe_shared_registry_file"'
 probe_shared_registry_file='registry.ld'

src/cmd/std/ps.c

@@ -1223,7 +1223,10 @@ addpid(Pssent_t* pe, register char* s)
 				break;
 			errno = 0;
 			n = strtol(t, &e, 0);
-			if (errno || n <= 0 || n > PID_MAX || *e)
+// deleting check for PID_MAX because on linux this relies on kernel instance
+// and the system will reject bad pids any way
+//			if (errno || n <= 0 || n > PID_MAX || *e)
+			if (errno || n <= 0 || *e)
 			{
 				error(2, "%s: invalid pid", t);
 				continue;

src/lib/libast/misc/cmdarg.c

@@ -129,6 +129,14 @@ cmdopen_20120411(char** argv, int argmax, int size, const char* argpat, Cmddisc_
 		n += sizeof(char**) + strlen(*p) + 1;
 	if ((x = strtol(astconf("ARG_MAX", NiL, NiL), NiL, 0)) <= 0)
 		x = ARG_MAX;
+
+#ifdef __linux__
+	// adjust for linux, perhaps page alignment is going on
+	// causes problems to tw when selecting many files
+	if (x > getpagesize () * 50)
+		x -= getpagesize ();
+#endif
+
 	if (size <= 0 || size > x)
 		size = x;
 	sh = pathshell();

src/lib/libast/sfio/sfputr.c

@@ -105,7 +105,9 @@ int		rc;	/* record separator.	*/
 			break;
 		}
 
-#if _lib_memccpy && !__ia64 /* these guys may never get it right */
+//#if _lib_memccpy && !__ia64 /* these guys may never get it right */
+// using memccpy here causes crashes - assuming overlap between src and dst
+#if 0
 		if((ps = (uchar*)memccpy(ps,s,'\0',p)) != NIL(uchar*))
 			ps -= 1;
 		else	ps  = f->next+p;