ld/testsuite/ld-undefined/undefined.exp

   1 # Test that the linker reports undefined symbol errors correctly.
   2 # By Ian Lance Taylor, Cygnus Support
   3 #
   4 #   Copyright (C) 1995-2016 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