1 # Test that the linker reports undefined symbol errors correctly.
2 # By Ian Lance Taylor, Cygnus Support
4 # Copyright (C) 1995-2014 Free Software Foundation, Inc.
6 # This file is part of the GNU Binutils.
8 # This program is free software; you can redistribute it and/or modify
9 # it under the terms of the GNU General Public License as published by
10 # the Free Software Foundation; either version 3 of the License, or
11 # (at your option) any later version.
13 # This program is distributed in the hope that it will be useful,
14 # but WITHOUT ANY WARRANTY; without even the implied warranty of
15 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 # GNU General Public License for more details.
18 # You should have received a copy of the GNU General Public License
19 # along with this program; if not, write to the Free Software
20 # Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
23 set testund "undefined"
24 set testfn "undefined function"
25 set testline "undefined line"
27 if { ![is_remote host] && [which $CC] == 0 } {
28 verbose "Could not find C compiler!" 1
35 if ![ld_compile "$CC -g" $srcdir/$subdir/undefined.c tmpdir/undefined.o] {
36 verbose "Unable to compile test file!" 1
43 remote_file host delete "tmpdir/undefined"
45 set flags [big_or_little_endian]
47 # Using -e start prevents the SunOS linker from trying to build a
49 send_log "$ld -e start $flags -o tmpdir/undefined tmpdir/undefined.o\n"
50 set exec_output [run_host_cmd "$ld" "-e start $flags -o tmpdir/undefined tmpdir/undefined.o"]
52 send_log "$exec_output\n"
53 verbose "$exec_output"
55 proc checkund { string testname } {
58 if [string match "*$string*" $exec_output] {
65 set mu "undefined reference to `*this_function_is_not_defined'"
68 # ARM PE defaults to using stabs debugging, which we can't handle for
70 #setup_xfail "arm*-*-pe*"
72 # For Xtensa on GNU Linux systems (or any other system where PIC code is
73 # always used), the address of the undefined function is in a literal pool
74 # outside the function, so that both the "undefined function" and "undefined
76 setup_xfail xtensa*-*-linux*
78 set mf "tmpdir/undefined.o* In function `function':"
82 # COFF SH gets this test wrong--it reports line 10, because although
83 # the jump is at line 9, the function address, and the reloc, is
84 # stored at the end of the function.
87 # ARM PE defaults to using stabs debugging, which we can't handle for
89 #setup_xfail "arm*-*-pe*"
92 set ml "undefined.c:9: undefined reference to `*this_function_is_not_defined'"
93 # With targets that use elf/dwarf2, such as the arm-elf
94 # toolchain, the code in bfd/elf.c:_bfd_elf_find_nearest_line() is called
95 # in order to locate the file name/line number where the undefined
96 # reference occurs. Unfortunately this tries to use the dwarf2 debug
97 # information held in the .debug_info section. This section contains a series
98 # of comp_unit structures, each of which has a low/high address range
99 # representing the span of memory locations covered by that structure. The
100 # structures also index into other structures held in the .debug_line section
101 # and together they can translate memory locations back into file/function/line
102 # number addresses in the source code. Since the information about the memory
103 # region covered by a comp_unit is only determined at link time, the low/high
104 # addresses in the .debug_info section and the line addresses in the .debug_line
105 # section are computed by generating relocs against known symbols in the object
108 # When the undefined reference is detected, the relocs in the dwarf2
109 # debug sections have not yet been resolved, so the low/high addresses and the
110 # line number address are all set at zero. Thus when _bfd_elf_find_nearest_line()
111 # calls _bfd_dwarf2_find_nearest_line() no comp_unit can be found which
112 # actually covers the address where the reference occured, and so
113 # _bfd_elf_find_nearest_line() fails.
115 # The upshot of all of this, is that the error message reported by the
116 # linker, instead of having a source file name & line number as in:
118 # undefined.c:9: undefined reference to `this_function_is_not_defined'
120 # has an object file & section address instead:
122 # undefined.0(.text+0xc): undefined reference to `this_function_is_not_defined'
124 # hence the xfails below.
126 setup_xfail mcore-*-elf
128 setup_xfail mips-sgi-irix6*
129 setup_xfail "sh64-*-*"
130 # Fails for the MSP430 because it uses SYM_DIFF relocs but it does
131 # not provide a special_function for handling them. If optimization
132 # is enabled then this test passes because function()'s prologue is
134 setup_xfail "msp430-*-*"
136 # The undefined test fails on 31 bit s/390 because the address of the
137 # function `this_function_is_not_defined' is stored in the literal pool of
138 # the function. Therefore the line number in the error message is 8 instead
139 # of 9. On 64 bit s/390 this works because of the new brasl instruction that
140 # doesn't need a literal pool entry.
141 #setup_xfail s390-*-*
143 # See comments above for Xtensa.
144 setup_xfail xtensa*-*-linux*
145 setup_xfail hppa*64*-*-*
147 checkund $ml $testline