Add flag -w to rgbasm to disable warnings

A lot of warnings are being added (and more will come) so it makes sense
to be able to disable them in legacy source that generates warnings but
is otherwise correct.

Signed-off-by: AntonioND <antonio_nd@outlook.com>

include/asm/main.h

@@ -11,6 +11,7 @@ struct sOptions {
 	bool verbose;
 	bool haltnop;
 	bool exportall;
+	bool warnings; /* true to enable warnings, false to disable them. */
 	    //-1 == random
 };
 

src/asm/main.c

@@ -256,6 +256,9 @@ fatalerror(const char *fmt, ...)
 void
 warning(const char *fmt, ...)
 {
+	if (!CurrentOptions.warnings)
+		return;
+
 	va_list args;
 	va_start(args, fmt);
 
@@ -312,12 +315,13 @@ main(int argc, char *argv[])
 	DefaultOptions.verbose = false;
 	DefaultOptions.haltnop = true;
 	DefaultOptions.exportall = false;
+	DefaultOptions.warnings = true;
 
 	opt_SetCurrentOptions(&DefaultOptions);
 
 	newopt = CurrentOptions;
 
-	while ((ch = getopt(argc, argv, "b:D:g:hi:o:p:vE")) != -1) {
+	while ((ch = getopt(argc, argv, "b:D:g:hi:o:p:vEw")) != -1) {
 		switch (ch) {
 		case 'b':
 			if (strlen(optarg) == 2) {
@@ -367,6 +371,9 @@ main(int argc, char *argv[])
 		case 'E':
 			newopt.exportall = true;
 			break;
+		case 'w':
+			newopt.warnings = false;
+			break;
 		default:
 			usage();
 		}

src/asm/rgbasm.1

@@ -20,7 +20,7 @@
 .Nd Game Boy assembler
 .Sh SYNOPSIS
 .Nm rgbasm
-.Op Fl Ehv
+.Op Fl Ehvw
 .Op Fl b Ar chars
 .Op Fl D Ar name Ns Op = Ns Ar value
 .Op Fl g Ar chars
@@ -68,6 +68,8 @@ When padding an image, pad with this value.
 The default is 0x00.
 .It Fl v
 Be verbose.
+.It Fl w
+Disable warning output.
 .El
 .Sh EXAMPLES
 Assembling a basic source file is simple: