43 lines
1.4 KiB
Text
43 lines
1.4 KiB
Text
# getprogname.m4 - check for getprogname or replacements for it
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# Copyright (C) 2016-2023 Free Software Foundation, Inc.
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# This file is free software; the Free Software Foundation
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# gives unlimited permission to copy and/or distribute it,
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# with or without modifications, as long as this notice is preserved.
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# serial 4
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AC_DEFUN([gl_FUNC_GETPROGNAME],
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[
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AC_CHECK_FUNCS_ONCE([getprogname getexecname])
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AC_REQUIRE([gl_USE_SYSTEM_EXTENSIONS])
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ac_found=0
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AC_CHECK_DECLS([program_invocation_name], [ac_found=1], [],
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[#include <errno.h>])
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AC_CHECK_DECLS([program_invocation_short_name], [ac_found=1], [],
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[#include <errno.h>])
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AC_CHECK_DECLS([__argv], [ac_found=1], [], [#include <stdlib.h>])
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# Incur the cost of this test only if none of the above worked.
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if test $ac_found = 0; then
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# On OpenBSD 5.1, using the global __progname variable appears to be
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# the only way to implement getprogname.
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AC_CACHE_CHECK([whether __progname is defined in default libraries],
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[gl_cv_var___progname],
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[
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gl_cv_var___progname=
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AC_LINK_IFELSE(
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[AC_LANG_PROGRAM(
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[[extern char *__progname;]],
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[[return *__progname;]]
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)],
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[gl_cv_var___progname=yes]
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)
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]
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)
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if test "$gl_cv_var___progname" = yes; then
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AC_DEFINE([HAVE_VAR___PROGNAME], 1,
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[Define if you have a global __progname variable])
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fi
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fi
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])
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