1 # Test that the linker reports undefined symbol errors correctly.
2 # By Ian Lance Taylor
, Cygnus Support
4 # Copyright
1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004,
5 #
2007 Free Software Foundation
, Inc.
7 # This file is part of the GNU Binutils.
9 # This
program is free software
; you can redistribute it and
/or modify
10 # it under the terms of the GNU General Public License as published by
11 # the Free Software Foundation
; either version
3 of the License
, or
12 #
(at your option
) any later version.
14 # This
program is distributed in the hope that it will be useful
,
15 # but WITHOUT
ANY WARRANTY
; without even the implied warranty of
16 # MERCHANTABILITY or FITNESS
FOR A PARTICULAR PURPOSE. See the
17 # GNU General Public License
for more details.
19 # You should have received a copy of the GNU General Public License
20 # along with this
program; if not
, write to the Free Software
21 # Foundation
, Inc.
, 51 Franklin Street
- Fifth Floor
, Boston
,
24 set testund
"undefined"
25 set testfn
"undefined function"
26 set testline
"undefined line"
28 if { ![is_remote host
] && [which $CC
] == 0 } {
29 verbose
"Could not find C compiler!" 1
36 if ![ld_compile
"$CC -g" $srcdir/$subdir/undefined.c tmpdir/undefined.o] {
37 verbose
"Unable to compile test file!" 1
44 remote_file host
delete "tmpdir/undefined"
46 set flags
[big_or_little_endian
]
48 # Using
-e start prevents the SunOS linker from trying to build a
50 send_log
"$ld -e start $flags -o tmpdir/undefined tmpdir/undefined.o\n"
51 set exec_output
[run_host_cmd
"$ld" "-e start $flags -o tmpdir/undefined tmpdir/undefined.o"]
53 send_log
"$exec_output\n"
54 verbose
"$exec_output"
56 proc checkund
{ string testname
} {
59 if [string match
"*$string*" $exec_output] {
66 set mu
"undefined reference to `*this_function_is_not_defined'"
69 # ARM PE defaults to using stabs debugging
, which we can
't handle for
71 #setup_xfail "arm*-*-pe*"
72 #setup_xfail "thumb*-*-pe*"
74 # For Xtensa on GNU Linux systems (or any other system where PIC code is
75 # always used), the address of the undefined function is in a literal pool
76 # outside the function, so that both the "undefined function" and "undefined
78 setup_xfail xtensa*-*-linux*
80 set mf "tmpdir/undefined.o* In function `function':"
84 # COFF SH gets this test wrong
--it reports line
10, because although
85 # the jump is at line
9, the function address
, and the reloc
, is
86 # stored at the end of the function.
89 # ARM PE defaults to using stabs debugging
, which we can
't handle for
91 #setup_xfail "arm*-*-pe*"
92 #setup_xfail "thumb*-*-pe*"
95 set ml "undefined.c:9: undefined reference to `*this_function_is_not_defined'"
96 # With targets that use elf
/dwarf2
, such as the arm
-elf and thumb
-elf
97 # toolchains
, the code in bfd
/elf.c
:_bfd_elf_find_nearest_line
() is called
98 # in order to locate the file
name/line number where the undefined
99 # reference occurs. Unfortunately this tries to use the dwarf2 debug
100 # information held in the .debug_info section. This section contains a series
101 # of comp_unit structures
, each of which has a low
/high address range
102 # representing the span of memory locations covered by that structure. The
103 # structures also index into other structures held in the .debug_line section
104 # and together they can
translate memory locations
back into file
/function
/line
105 # number addresses in the source code. Since the information about the memory
106 # region covered by a comp_unit is only determined at link time
, the low
/high
107 # addresses in the .debug_info section and the line addresses in the .debug_line
108 # section are computed by generating relocs against known symbols in the object
111 # When the undefined reference is detected
, the relocs in the dwarf2
112 # debug sections have not yet been resolved
, so the low
/high addresses and the
113 # line number address are all
set at zero. Thus when _bfd_elf_find_nearest_line
()
114 # calls _bfd_dwarf2_find_nearest_line
() no comp_unit can be found which
115 # actually covers the address where the reference occured
, and so
116 # _bfd_elf_find_nearest_line
() fails.
118 # The upshot of all of this
, is that the error message reported by the
119 # linker
, instead of having a source file
name & line number as in
:
121 # undefined.c
:9: undefined reference to `this_function_is_not_defined
'
123 # has an object file & section address instead:
125 # undefined.0(.text+0xc): undefined reference to `this_function_is_not_defined'
127 # hence the xfails below.
129 setup_xfail mcore
-*-elf
131 setup_xfail mips
-sgi
-irix6
*
132 setup_xfail
"sh64-*-*"
134 # The undefined test fails
on 31 bit s
/390 because the address of the
135 # function `this_function_is_not_defined
' is stored in the literal pool of
136 # the function. Therefore the line number in the error message is 8 instead
137 # of 9. On 64 bit s/390 this works because of the new brasl instruction that
138 # doesn't need a literal pool entry.
141 # See comments above
for Xtensa.
142 setup_xfail xtensa
*-*-linux
*
144 checkund $ml $testline