Commit | Line | Data |
---|---|---|
6ec2e0f5 SDJ |
1 | # getprogname.m4 - check for getprogname or replacements for it |
2 | ||
c0c3707f | 3 | # Copyright (C) 2016-2019 Free Software Foundation, Inc. |
6ec2e0f5 SDJ |
4 | # This file is free software; the Free Software Foundation |
5 | # gives unlimited permission to copy and/or distribute it, | |
6 | # with or without modifications, as long as this notice is preserved. | |
7 | ||
8 | # serial 4 | |
9 | ||
10 | AC_DEFUN([gl_FUNC_GETPROGNAME], | |
11 | [ | |
12 | AC_CHECK_FUNCS_ONCE([getprogname getexecname]) | |
13 | AC_REQUIRE([gl_USE_SYSTEM_EXTENSIONS]) | |
14 | ac_found=0 | |
15 | AC_CHECK_DECLS([program_invocation_name], [ac_found=1], [], | |
16 | [#include <errno.h>]) | |
17 | AC_CHECK_DECLS([program_invocation_short_name], [ac_found=1], [], | |
18 | [#include <errno.h>]) | |
19 | AC_CHECK_DECLS([__argv], [ac_found=1], [], [#include <stdlib.h>]) | |
20 | ||
21 | # Incur the cost of this test only if none of the above worked. | |
22 | if test $ac_found = 0; then | |
23 | # On OpenBSD 5.1, using the global __progname variable appears to be | |
24 | # the only way to implement getprogname. | |
25 | AC_CACHE_CHECK([whether __progname is defined in default libraries], | |
26 | [gl_cv_var___progname], | |
27 | [ | |
28 | gl_cv_var___progname= | |
29 | AC_LINK_IFELSE( | |
30 | [AC_LANG_PROGRAM( | |
31 | [[extern char *__progname;]], | |
32 | [[return *__progname;]] | |
33 | )], | |
34 | [gl_cv_var___progname=yes] | |
35 | ) | |
36 | ] | |
37 | ) | |
38 | if test "$gl_cv_var___progname" = yes; then | |
39 | AC_DEFINE([HAVE_VAR___PROGNAME], 1, | |
40 | [Define if you have a global __progname variable]) | |
41 | fi | |
42 | fi | |
43 | ]) |