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 # 2005, 2007, 2008, 2010, 2011 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*"
73 # For Xtensa on GNU Linux systems (or any other system where PIC code is
74 # always used), the address of the undefined function is in a literal pool
75 # outside the function, so that both the "undefined function" and "undefined
77 setup_xfail xtensa*-*-linux*
79 set mf "tmpdir/undefined.o* In function `function':"
83 # COFF SH gets this test wrong--it reports line 10, because although
84 # the jump is at line 9, the function address, and the reloc, is
85 # stored at the end of the function.
88 # ARM PE defaults to using stabs debugging, which we can't handle for
90 #setup_xfail "arm*-*-pe*"
93 set ml "undefined.c:9: undefined reference to `*this_function_is_not_defined'"
94 # With targets that use elf/dwarf2, such as the arm-elf
95 # toolchain, the code in bfd/elf.c:_bfd_elf_find_nearest_line() is called
96 # in order to locate the file name/line number where the undefined
97 # reference occurs. Unfortunately this tries to use the dwarf2 debug
98 # information held in the .debug_info section. This section contains a series
99 # of comp_unit structures, each of which has a low/high address range
100 # representing the span of memory locations covered by that structure. The
101 # structures also index into other structures held in the .debug_line section
102 # and together they can translate memory locations back into file/function/line
103 # number addresses in the source code. Since the information about the memory
104 # region covered by a comp_unit is only determined at link time, the low/high
105 # addresses in the .debug_info section and the line addresses in the .debug_line
106 # section are computed by generating relocs against known symbols in the object
109 # When the undefined reference is detected, the relocs in the dwarf2
110 # debug sections have not yet been resolved, so the low/high addresses and the
111 # line number address are all set at zero. Thus when _bfd_elf_find_nearest_line()
112 # calls _bfd_dwarf2_find_nearest_line() no comp_unit can be found which
113 # actually covers the address where the reference occured, and so
114 # _bfd_elf_find_nearest_line() fails.
116 # The upshot of all of this, is that the error message reported by the
117 # linker, instead of having a source file name & line number as in:
119 # undefined.c:9: undefined reference to `this_function_is_not_defined'
121 # has an object file & section address instead:
123 # undefined.0(.text+0xc): undefined reference to `this_function_is_not_defined'
125 # hence the xfails below.
127 setup_xfail mcore-*-elf
129 setup_xfail mips-sgi-irix6*
130 setup_xfail "sh64-*-*"
132 # The undefined test fails on 31 bit s/390 because the address of the
133 # function `this_function_is_not_defined' is stored in the literal pool of
134 # the function. Therefore the line number in the error message is 8 instead
135 # of 9. On 64 bit s/390 this works because of the new brasl instruction that
136 # doesn't need a literal pool entry.
139 # See comments above for Xtensa.
140 setup_xfail xtensa*-*-linux*
141 setup_xfail hppa*64*-*-*
143 checkund $ml $testline