* lib/getprogname.c (__progname) [HAVE_DECL___PROGNAME]: Declare.
(getprogname) [HAVE_DECL___PROGNAME]: Return __progname or "?".
* modules/getprogname (configure.ac): Move most of this code...
* m4/getprogname.m4 (gl_FUNC_GETPROGNAME): ... to this function,
increment serial number, and add a test for __progname.
https://bugs.gnu.org/24562
Reported by Nelson H. F. Beebe.
* lib/getprogname.c (getprogname): Include "dirname.h" and use
last_component: more general than open coding it with hard-coded "/".
* lib/getprogname.h (getprogname): Prefer "char const *" consistently.
* modules/getprogname (Depends-on): Add dirname-lgpl.
(configure.ac): Check for __argv in <stdlib.h>.
* modules/getprogname-tests: New file.
* tests/test-getprogname.c: New file.
Suggested by Gisle Vanem in
https://lists.gnu.org/archive/html/bug-gnulib/2016-09/msg00014.html
This provides a LGPL module for getting the name of the current
program, using the same API found on *BSD systems.
* lib/getprogname.c, lib/getprogname.h, m4/getprogname.m4:
* modules/getprogname: New files.
* MODULES.html.sh (Misc): Add getprogname.
* NEWS: Document the deprecation of the 'progname' module.
