code review 204044: *l/*c: add -V flag to display version number

src/cmd/gc/lex.c

 // Copyright 2009 The Go Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
 #define         EXTERN
 #include        "go.h"
 #include        "y.tab.h"
 #include <ar.h>
 
 extern int yychar;
@@ skipping 47 matching lines @@
                         debug[c]++;
                 break;
 
         case 'o':
                 outfile = ARGF();
                 break;
 
         case 'I':
                 addidir(ARGF());
                 break;
+        case 'V':
+                print("%cg verison %s\n", thechar, getgoversion());

[rsc, 2010/02/06 00:23:13]

version

+                errorexit();
         } ARGEND
 
         if(argc < 1)
                 goto usage;
 
         // special flag to detect compilation of package runtime
         compiling_runtime = debug['+'];
 
         pathname = mal(1000);
         if(getwd(pathname, 999) == 0)
@@ skipping 83 matching lines @@
 usage:
         print("flags:\n");
         // -A is allow use of "any" type, for bootstrapping
         print("  -I DIR search for packages in DIR\n");
         print("  -d print declarations\n");
         print("  -e no limit on number of errors printed\n");
         print("  -f print stack frame structure\n");
         print("  -h panic on an error\n");
         print("  -o file specify output file\n");
         print("  -S print the assembly language\n");
+        print("  -V print the version number of %cg\n", thechar);

[rsc, 2010/02/06 00:23:13]

print the compiler version

         print("  -w print the parse tree after typing\n");
         print("  -x print lex tokens\n");
         exit(0);
         return 0;
 }
 
 int
 arsize(Biobuf *b, char *name)
 {
         struct ar_hdr *a;
@@ skipping 1425 matching lines @@
                         p = infile;
                 else
                         p = p+1;
                 snprint(namebuf, sizeof(namebuf), "%s", p);
                 p = strrchr(namebuf, '.');
                 if(p != nil)
                         *p = 0;
                 outfile = smprint("%s.%c", namebuf, thechar);
         }
 }