1 # Test that the linker reports undefined symbol errors correctly. 2 # By Ian Lance Taylor, Cygnus Support 3 # 4 # Copyright (C) 1995-2014 Free Software Foundation, Inc. 5 # 6 # This file is part of the GNU Binutils. 7 # 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. 12 # 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. 17 # 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, 21 # MA 02110-1301, USA. 22 23 set testund "undefined" 24 set testfn "undefined function" 25 set testline "undefined line" 26 27 if { ![is_remote host] && [which $CC] == 0 } { 28 verbose "Could not find C compiler!" 1 29 untested $testund 30 untested $testfn 31 untested $testline 32 return 33 } 34 35 if ![ld_compile "$CC -g" $srcdir/$subdir/undefined.c tmpdir/undefined.o] { 36 verbose "Unable to compile test file!" 1 37 unresolved $testund 38 unresolved $testfn 39 unresolved $testline 40 return 41 } 42 43 remote_file host delete "tmpdir/undefined" 44 45 set flags [big_or_little_endian] 46 47 # Using -e start prevents the SunOS linker from trying to build a 48 # shared library. 49 send_log "$ld -e start $flags -o tmpdir/undefined tmpdir/undefined.o\n" 50 set exec_output [run_host_cmd "$ld" "-e start $flags -o tmpdir/undefined tmpdir/undefined.o"] 51 52 send_log "$exec_output\n" 53 verbose "$exec_output" 54 55 proc checkund { string testname } { 56 global exec_output 57 58 if [string match "*$string*" $exec_output] { 59 pass $testname 60 } else { 61 fail $testname 62 } 63 } 64 65 set mu "undefined reference to `*this_function_is_not_defined'" 66 checkund $mu $testund 67 68 # ARM PE defaults to using stabs debugging, which we can't handle for 69 # a COFF file. 70 #setup_xfail "arm*-*-pe*" 71 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 75 # line" tests fail. 76 setup_xfail xtensa*-*-linux* 77 78 set mf "tmpdir/undefined.o* In function `function':" 79 checkund $mf $testfn 80 81 if ![is_elf_format] { 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. 85 setup_xfail "sh-*-*" 86 87 # ARM PE defaults to using stabs debugging, which we can't handle for 88 # a COFF file. 89 #setup_xfail "arm*-*-pe*" 90 } 91 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 106 # code. 107 # 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. 114 # 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: 117 # 118 # undefined.c:9: undefined reference to `this_function_is_not_defined' 119 # 120 # has an object file & section address instead: 121 # 122 # undefined.0(.text+0xc): undefined reference to `this_function_is_not_defined' 123 # 124 # hence the xfails below. 125 126 setup_xfail mcore-*-elf 127 setup_xfail mep-*-* 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 133 # eliminated. 134 setup_xfail "msp430-*-*" 135 136 # 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-*-* 142 143 # See comments above for Xtensa. 144 setup_xfail xtensa*-*-linux* 145 setup_xfail hppa*64*-*-* 146 147 checkund $ml $testline 148
