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43 lines
1.4 KiB
43 lines
1.4 KiB
# getprogname.m4 - check for getprogname or replacements for it |
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# Copyright (C) 2016-2017 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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