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
5 # Free Software Foundation
, Inc.
7 # This file is free software
; you can redistribute it and
/or modify
8 # it under the terms of the GNU General Public License as published by
9 # the Free Software Foundation
; either version
2 of the License
, or
10 #
(at your option
) any later version.
12 # This
program is distributed in the hope that it will be useful
,
13 # but WITHOUT
ANY WARRANTY
; without even the implied warranty of
14 # MERCHANTABILITY or FITNESS
FOR A PARTICULAR PURPOSE. See the
15 # GNU General Public License
for more details.
17 # You should have received a copy of the GNU General Public License
18 # along with this
program; if not
, write to the Free Software
19 # Foundation
, Inc.
, 59 Temple Place
- Suite
330, Boston
, MA
02111-1307, USA.
21 set testund
"undefined"
22 set testfn
"undefined function"
23 set testline
"undefined line"
25 if { [which $CC
] == 0 } {
26 verbose
"Could not find C compiler!" 1
33 if ![ld_compile
"$CC -g" $srcdir/$subdir/undefined.c tmpdir/undefined.o] {
34 verbose
"Unable to compile test file!" 1
41 catch
"exec rm -f tmpdir/undefined" exec_output
43 set flags
[big_or_little_endian
]
45 # Using
-e start prevents the SunOS linker from trying to build a
47 send_log
"$ld -e start $flags -o tmpdir/undefined tmpdir/undefined.o\n"
48 verbose
"$ld -e start $flags -o tmpdir/undefined tmpdir/undefined.o"
50 catch
"exec $ld -e start $flags -o tmpdir/undefined tmpdir/undefined.o" exec_output
51 send_log
"$exec_output\n"
52 verbose
"$exec_output"
54 proc checkund
{ string testname
} {
57 if [string match
"*$string*" $exec_output] {
64 set mu
"undefined reference to `*this_function_is_not_defined'"
67 # ARM PE defaults to using stabs debugging
, which we can
't handle for
69 #setup_xfail "arm*-*-pe*"
70 #setup_xfail "thumb*-*-pe*"
72 # Just doesn't work
for PA ELF. No clue why.
73 setup_xfail
"hppa*-*-*elf*"
75 set mf
"tmpdir/undefined.o* In function `function':"
80 # Just doesn
't work for PA ELF. No clue why.
81 setup_xfail "hppa*-*-*"
85 # COFF SH gets this test wrong--it reports line 10, because although
86 # the jump is at line 9, the function address, and the reloc, is
87 # stored at the end of the function.
90 # ARM PE defaults to using stabs debugging, which we can't handle
for
92 #setup_xfail
"arm*-*-pe*"
93 #setup_xfail
"thumb*-*-pe*"
96 set ml
"undefined.c:9: undefined reference to `*this_function_is_not_defined'"
97 # With targets that use elf
/dwarf2
, such as the arm
-elf and thumb
-elf
98 # toolchains
, the code in bfd
/elf.c
:_bfd_elf_find_nearest_line
() is called
99 # in order to locate the file
name/line number where the undefined
100 # reference occurs. Unfortunately this tries to use the dwarf2 debug
101 # information held in the .debug_info section. This section contains a series
102 # of comp_unit structures
, each of which has a low
/high address range
103 # representing the span of memory locations covered by that structure. The
104 # structures also index into other structures held in the .debug_line section
105 # and together they can
translate memory locations
back into file
/function
/line
106 # number addresses in the source code. Since the information about the memory
107 # region covered by a comp_unit is only determined at link time
, the low
/high
108 # addresses in the .debug_info section and the line addresses in the .debug_line
109 # section are computed by generating relocs against known symbols in the object
112 # When the undefined reference is detected
, the relocs in the dwarf2
113 # debug sections have not yet been resolved
, so the low
/high addresses and the
114 # line number address are all
set at zero. Thus when _bfd_elf_find_nearest_line
()
115 # calls _bfd_dwarf2_find_nearest_line
() no comp_unit can be found which
116 # actually covers the address where the reference occured
, and so
117 # _bfd_elf_find_nearest_line
() fails.
119 # The upshot of all of this
, is that the error message reported by the
120 # linker
, instead of having a source file
name & line number as in
:
122 # undefined.c
:9: undefined reference to `this_function_is_not_defined
'
124 # has an object file & section address instead:
126 # undefined.0(.text+0xc): undefined reference to `this_function_is_not_defined'
128 # hence the xfails below.
130 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 checkund $ml $testline