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/env.c b/src/env.c
index 5103cc927..67e411f18 100644
--- a/src/env.c
+++ b/src/env.c
@@ -96,9 +96,6 @@ int putenv ();
 
 extern char **environ;
 
-/* The name by which this program was run. */
-char const *program_name;
-
 static struct option const longopts[] =
 {
   {"ignore-environment", no_argument, NULL, 'i'},
@@ -143,7 +140,7 @@ main (int argc, char **argv)
   bool ignore_environment = false;
 
   initialize_main (&argc, &argv);
-  program_name = argv[0];
+  set_program_name (argv[0]);
   setlocale (LC_ALL, "");
   bindtextdomain (PACKAGE, LOCALEDIR);
   textdomain (PACKAGE);