Support vbcc compiler.

README.md

@@ -57,6 +57,7 @@ Supported compilers
 * [CompCert](https://compcert.org/)
 * [Nils Weller's C compiler](http://nwcc.sourceforge.net/)
 * [cproc](https://sr.ht/~mcf/cproc/) (Currently requires a small tweak to ignore a volatile store error)
+* [vbcc](http://www.compilers.de/vbcc.html) (Only tested on OpenBSD/i386)
 
 Building with a compiler not listed here? Add it and send a pull request!
 

configure

@@ -963,6 +963,11 @@ else
   echo "$cc"
 fi
 
+if [ "x$cc" = "xvc" ] ; then
+  echo "using vbcc, setting CFLAGS to -g -O=990"
+  cflags="-g -O=990 -DEMACS -DVI"
+fi
+
 if [ "x$cflags" = "x-DEMACS -DVI" ] ; then
   printf "checking if the compiler accepts -g -O2... "
   defaultcflagscheck
@@ -1030,6 +1035,9 @@ case "x$os" in
       "xnwcc")
 	ldflags="$ldflags -Wl,-nopie"
 	;;
+      "xvc")
+	cflags="$cflags -D_ANSI_LIBRARY"
+	;;
     esac
     ;;
   "xAIX"|"xOS400")

emacs.c

@@ -277,7 +277,7 @@ static const struct x_ftab x_ftab[] = {
 	{ 0, 0, 0 },
 };
 
-int
+static int
 isu8cont(unsigned char c)
 {
 	return (c & (0x80 | 0x40)) == 0x80;