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/su.c b/src/su.c
index d6aaaaa88..f6b61f773 100644
--- a/src/su.c
+++ b/src/su.c
@@ -128,9 +128,6 @@ extern char **environ;
 static void run_shell (char const *, char const *, char **, size_t)
      ATTRIBUTE_NORETURN;
 
-/* The name this program was run with.  */
-char const *program_name;
-
 /* If true, pass the `-f' option to the subshell.  */
 static bool fast_startup;
 
@@ -414,7 +411,7 @@ main (int argc, char **argv)
   struct passwd pw_copy;
 
   initialize_main (&argc, &argv);
-  program_name = argv[0];
+  set_program_name (argv[0]);
   setlocale (LC_ALL, "");
   bindtextdomain (PACKAGE, LOCALEDIR);
   textdomain (PACKAGE);