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# getprogname.m4 - check for getprogname or replacements for it
# Copyright (C) 2016-2021 Free Software Foundation, Inc.
# This file is free software; the Free Software Foundation
# gives unlimited permission to copy and/or distribute it,
# with or without modifications, as long as this notice is preserved.
# serial 4
AC_DEFUN([gl_FUNC_GETPROGNAME],
[
AC_CHECK_FUNCS_ONCE([getprogname getexecname])
AC_REQUIRE([gl_USE_SYSTEM_EXTENSIONS])
ac_found=0
AC_CHECK_DECLS([program_invocation_name], [ac_found=1], [],
[#include <errno.h>])
AC_CHECK_DECLS([program_invocation_short_name], [ac_found=1], [],
[#include <errno.h>])
AC_CHECK_DECLS([__argv], [ac_found=1], [], [#include <stdlib.h>])
# Incur the cost of this test only if none of the above worked.
if test $ac_found = 0; then
# On OpenBSD 5.1, using the global __progname variable appears to be
# the only way to implement getprogname.
AC_CACHE_CHECK([whether __progname is defined in default libraries],
[gl_cv_var___progname],
[
gl_cv_var___progname=
AC_LINK_IFELSE(
[AC_LANG_PROGRAM(
[[extern char *__progname;]],
[[return *__progname;]]
)],
[gl_cv_var___progname=yes]
)
]
)
if test "$gl_cv_var___progname" = yes; then
AC_DEFINE([HAVE_VAR___PROGNAME], 1,
[Define if you have a global __progname variable])
fi
fi
])
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