1#   Copyright (C) 1999, 2001 Free Software Foundation, Inc.
2
3# This program is free software; you can redistribute it and/or modify
4# it under the terms of the GNU General Public License as published by
5# the Free Software Foundation; either version 2 of the License, or
6# (at your option) any later version.
7#
8# This program is distributed in the hope that it will be useful,
9# but WITHOUT ANY WARRANTY; without even the implied warranty of
10# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
11# GNU General Public License for more details.
12#
13# You should have received a copy of the GNU General Public License
14# along with this program; if not, write to the Free Software
15# Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
16
17# Please email any bugs, comments, and/or additions to this file to:
18# gcc-patches@gcc.gnu.org
19
20# This file defines procs for determining features supported by the target.
21
22###############################
23# proc check_weak_available { }
24###############################
25
26# weak symbols are only supported in some configs/object formats
27# this proc returns 1 if they're supported, 0 if they're not, or -1 if unsure
28
29proc check_weak_available { } {
30    global target_triplet
31    global target_cpu
32
33    # All mips targets should support it
34
35    if { [ string first "mips" $target_cpu ] >= 0 } {
36        return 1
37    }
38
39    # All solaris2 targets should support it
40
41    if { [regexp ".*-solaris2.*" $target_triplet] } {
42        return 1
43    }
44
45    # DEC OSF/1/Digital UNIX/Tru64 UNIX supports it
46
47    if { [regexp "alpha.*osf.*" $target_triplet] } {
48	return 1
49    }
50
51    # ELF and ECOFF support it. a.out does with gas/gld but may also with
52    # other linkers, so we should try it
53
54    set objformat [gcc_target_object_format]
55
56    switch $objformat {
57        elf      { return 1 }
58        ecoff    { return 1 }
59        a.out    { return 1 }
60        unknown  { return -1 }
61        default  { return 0 }
62    }
63}
64
65###############################
66# proc check_alias_available { }
67###############################
68
69# Determine if the target toolchain supports the alias attribute.
70# Parameter is the pathname of a file that can be used to test the alias support.
71# Returns yes if it does.
72# Returns no if it does not.
73# Returns dontknow if something went wrong
74# For an example of the use of this function, see gcc.dg/special/ecos.exp
75
76proc check_alias_available { testfile } {
77    global alias_available_saved
78
79    if [info exists alias_available_saved] {
80        verbose "check_alias_available  returning saved $alias_available_saved" 2
81    } else {
82        verbose "check_alias_available  compiling testfile $testfile" 2
83	set lines [gcc_target_compile $testfile "tmp.o" object ""]
84
85	if [string match "" $lines] then {
86	    # No error messages, everything is OK.
87	    set alias_available_saved yes
88	} else {
89	    if [regexp "alias definitions not supported" $lines] {
90		verbose "check_alias_available  target does not support aliases" 2
91
92		set objformat [gcc_target_object_format]
93
94		if { $objformat == "elf" } {
95		    verbose "check_alias_available  but target uses ELF format, so it ought to" 2
96		    set alias_available_saved dontknow
97		} else {
98		    set alias_available_saved no
99		}
100	    } else {
101		if [regexp "only weak aliases are supported" $lines] {
102		verbose "check_alias_available  target supports only weak aliases" 2
103		set alias_available_saved no
104		} else {
105		    set alias_available_saved dontknow
106		}
107	    }
108	}
109
110	verbose "check_alias_available  returning $alias_available_saved" 2
111    }
112
113    return $alias_available_saved
114}
115