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, 1996, 1997 Free Software Foundation
   5 #
   6 # This file is free software; you can redistribute it and/or modify
   7 # it under the terms of the GNU General Public License as published by
   8 # the Free Software Foundation; either version 2 of the License, or
   9 # (at your option) any later version.
  10 #
  11 # This program is distributed in the hope that it will be useful,
  12 # but WITHOUT ANY WARRANTY; without even the implied warranty of
  13 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14 # GNU General Public License for more details.
  15 #
  16 # You should have received a copy of the GNU General Public License
  17 # along with this program; if not, write to the Free Software
  18 # Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
  19
  20 set testund "undefined"
  21 set testfn "undefined function"
  22 set testline "undefined line"
  23
  24 if { [which $CC] == 0 } {
  25     verbose "Could not find C compiler!" 1
  26     untested $testund
  27     untested $testfn
  28     untested $testline
  29     return
  30 }
  31
  32 if ![ld_compile "$CC -g" $srcdir/$subdir/undefined.c tmpdir/undefined.o] {
  33     verbose "Unable to compile test file!" 1
  34     unresolved $testund
  35     unresolved $testfn
  36     unresolved $testline
  37     return
  38 }
  39
  40 catch "exec rm -f tmpdir/undefined" exec_output
  41
  42 # Using -e start prevents the SunOS linker from trying to build a
  43 # shared library.
  44 send_log "$ld -e start -o tmpdir/undefined tmpdir/undefined.o\n"
  45 verbose "$ld -e start -o tmpdir/undefined tmpdir/undefined.o"
  46
  47 catch "exec $ld -e start -o tmpdir/undefined tmpdir/undefined.o" exec_output
  48 send_log "$exec_output\n"
  49 verbose "$exec_output"
  50
  51 proc checkund { string testname } {
  52     global exec_output
  53
  54     if [string match "*$string*" $exec_output] {
  55         pass $testname
  56     } else {
  57         fail $testname
  58     }
  59 }
  60
  61 set mu "undefined reference to `this_function_is_not_defined'"
  62 checkund $mu $testund
  63
  64 # ARM PE defaults to using stabs debugging, which we can't handle for
  65 # a COFF file.
  66 #setup_xfail "arm*-*-pe*"
  67 #setup_xfail "thumb*-*-pe*"
  68
  69 # Just doesn't work for PA ELF.  No clue why.
  70 setup_xfail "hppa*-*-*elf*"
  71
  72 set mf "tmpdir/undefined.o: In function `function':"
  73 checkund $mf $testfn
  74
  75 # COFF SH gets this test wrong--it reports line 10, because although
  76 # the jump is at line 9, the function address, and the reloc, is
  77 # stored at the end of the function.
  78 setup_xfail "sh-*-*"
  79
  80 # ARM PE defaults to using stabs debugging, which we can't handle for
  81 # a COFF file.
  82 #setup_xfail "arm*-*-pe*"
  83 #setup_xfail "thumb*-*-pe*"
  84
  85 # Just doesn't work for PA ELF.  No clue why.
  86 setup_xfail "hppa*-*-*elf*"
  87
  88 set ml "undefined.c:9: undefined reference to `this_function_is_not_defined'"
  89 # With targets that use elf/dwarf2, such as the arm-elf and thumb-elf
  90 # toolchains, the code in bfd/elf.c:_bfd_elf_find_nearest_line() is called
  91 # in order to locate the file name/line number where the undefined
  92 # reference occurs.  Unfortunately this tries to use the dwarf2 debug
  93 # information held in the .debug_info section.  This section contains a series
  94 # of comp_unit structures, each of which has a low/high address range
  95 # representing the span of memory locations covered by that structure.  The
  96 # structures also index into other structures held in the .debug_line section
  97 # and together they can translate memory locations back into file/function/line
  98 # number addresses in the source code.  Since the information about the memory
  99 # region covered by a comp_unit is only determined at link time, the low/high
 100 # addresses in the .debug_info section and the line addresses in the .debug_line
 101 # section are computed by generating relocs against known symbols in the object
 102 # code.
 103 #
 104 # When the undefined reference is detected, the relocs in the dwarf2
 105 # debug sections have not yet been resolved, so the low/high addresses and the
 106 # line number address are all set at zero.  Thus when _bfd_elf_find_nearest_line()
 107 # calls _bfd_dwarf2_find_nearest_line() no comp_unit can be found which
 108 # actually covers the address where the reference occured, and so
 109 # _bfd_elf_find_nearest_line() fails.
 110 #
 111 # The upshot of all of this, is that the error message reported by the
 112 # linker, instead of having a source file name & line number as in:
 113 #
 114 #   undefined.c:9: undefined reference to `this_function_is_not_defined'
 115 #
 116 # has an object file & section address instead:
 117 #
 118 #   undefined.0(.text+0xc): undefined reference to `this_function_is_not_defined'
 119 #
 120 # hence the xfails below.
 121
 122 setup_xfail arm-*-elf
 123 setup_xfail strongarm-*-elf
 124 setup_xfail thumb-*-elf
 125
 126 checkund $ml $testline