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nm: Add flag -f

This flag is intended for full output, and it forces
to print all the symbols, included those symbols that
are usually suppresed.

--- a/src/cmd/nm.c

+++ b/src/cmd/nm.c

@@ -24,6 +24,7 @@

 static int vflag;

 static int gflag;

 static int uflag;

+static int fflag;

 static char *filename, *membname;

 static void

@@ -125,8 +126,8 @@

 	size_t n, size;

 	int type = sym->type;

-	if (type == '?'

-	|| type == 'N'

+	if (type == '?' && !fflag

+	|| type == 'N' && !fflag

 	|| uflag && type != 'U'

 	|| gflag && !isupper(type)) {

 		return 0;

@@ -238,7 +239,7 @@

 static void

 usage(void)

 {

-	fputs("nm [-APv][ -g| -u][-t format] [file...]\n", stderr);

+	fputs("nm [-APvf][-g|-u][-t format] [file...]\n", stderr);

 	exit(1);

 }

@@ -256,6 +257,9 @@

 		break;

 	case 'g':

 		gflag = 1;

+		break;

+	case 'f':

+		fflag = 1;

 		break;

 	case 'u':

 		uflag = 1;