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Annotation of embedaddon/libiconv/srcm4/getprogname.m4, revision 1.1.1.1

1.1       misho       1: # getprogname.m4 - check for getprogname or replacements for it
                      2: 
                      3: # Copyright (C) 2016-2019 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: 
                     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: ])