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-rw-r--r--gl/m4/getprogname.m443
1 files changed, 43 insertions, 0 deletions
diff --git a/gl/m4/getprogname.m4 b/gl/m4/getprogname.m4
new file mode 100644
index 0000000..b67c527
--- /dev/null
+++ b/gl/m4/getprogname.m4
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1# getprogname.m4 - check for getprogname or replacements for it
2
3# Copyright (C) 2016-2023 Free Software Foundation, Inc.
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
10AC_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])