nm: Accept long option --extern-only for -g

Submitted by:	jkim

contrib/elftoolchain/nm/nm.1

@@ -24,7 +24,7 @@
 .\"
 .\" $Id: nm.1 2377 2012-01-03 07:10:59Z jkoshy $
 .\"
-.Dd January 3, 2012
+.Dd January 8, 2015
 .Os
 .Dt NM 1
 .Sh NAME
@@ -36,6 +36,7 @@
 .Op Fl -defined-only
 .Op Fl -demangle Ns Op = Ns style
 .Op Fl -dynamic
+.Op Fl -extern-only
 .Op Fl -help
 .Op Fl -line-numbers
 .Op Fl -no-demangle
@@ -107,6 +108,8 @@ is not specified, it is taken to be
 .It Fl -dynamic
 Only display dynamic symbols.
 This option is only meaningful for shared libraries.
+.It Fl -extern-only
+Only display information about global (external) symbols.
 .It Fl -help
 Display a help message and exit.
 .It Fl -format Ns = Ns Ar format
@@ -200,7 +203,8 @@ Only display information for global and static symbols.
 .It Fl f
 Produce full output (default).
 .It Fl g
-Only display information about global (external) symbols.
+Equivalent to specifying option
+.Fl -extern-only .
 .It Fl h
 Equivalent to specifying option
 .Fl -help .

contrib/elftoolchain/nm/nm.c

@@ -248,6 +248,7 @@ static const struct option nm_longopts[] = {
 	{ "defined-only",	no_argument,		&nm_opts.def_only, 1},
 	{ "demangle",		optional_argument,	NULL,		'C' },
 	{ "dynamic",		no_argument,		NULL,		'D' },
+	{ "extern-only",	no_argument,		NULL,		'g' },
 	{ "format",		required_argument,	NULL,		'F' },
 	{ "help",		no_argument,		NULL,		'h' },
 	{ "line-numbers",	no_argument,		NULL,		'l' },
@@ -2042,7 +2043,7 @@ usage(int exitcode)
 \n  -f                        Produce full output (default).\
 \n      --format=format       Display output in specific format.  Allowed\
 \n                            formats are: \"bsd\", \"posix\" and \"sysv\".\
-\n  -g                        Display only global symbol information.\
+\n  -g, --extern-only         Display only global symbol information.\
 \n  -h, --help                Show this help message.\
 \n  -l, --line-numbers        Display filename and linenumber using\
 \n                            debugging information.\