use gnulib's progname module

* bootstrap.conf (gnulib_modules): Add progname.
* src/*.c (program_name): Remove declaration.
* (main): Call set_program_name rather than setting program_name.
* src/nice.c (main): Cast program_name to "(char *)".
* src/prog-fprintf.c: Include "system.h"
* src/system.h: Include "progname.h".
* maint.mk (sc_program_name): Adjust rule.
Suggestion from Eric Blake.

1 files changed, 1 insertions, 4 deletions

diff --git a/src/cat.c b/src/cat.c
index fd6c9df0d..d762f4549 100644
--- a/src/cat.c
+++ b/src/cat.c
@@ -51,9 +51,6 @@
 #undef max
 #define max(h,i) ((h) > (i) ? (h) : (i))
 
-/* Name under which this program was invoked.  */
-char const *program_name;
-
 /* Name of input file.  May be "-".  */
 static char const *infile;
 
@@ -565,7 +562,7 @@ main (int argc, char **argv)
   };
 
   initialize_main (&argc, &argv);
-  program_name = argv[0];
+  set_program_name (argv[0]);
   setlocale (LC_ALL, "");
   bindtextdomain (PACKAGE, LOCALEDIR);
   textdomain (PACKAGE);