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# Test that the linker reports undefined symbol errors correctly.

# By Ian Lance Taylor, Cygnus Support

#

#   Copyright 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004,

#   2005, 2007, 2008, 2010, 2011  Free Software Foundation, Inc.

#

# This file is part of the GNU Binutils.

#

# This program is free software; you can redistribute it and/or modify

# it under the terms of the GNU General Public License as published by

# the Free Software Foundation; either version 3 of the License, or

# (at your option) any later version.

#

# This program is distributed in the hope that it will be useful,

# but WITHOUT ANY WARRANTY; without even the implied warranty of

# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

# GNU General Public License for more details.

#

# You should have received a copy of the GNU General Public License

# along with this program; if not, write to the Free Software

# Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,

# MA 02110-1301, USA.

set testund "undefined"

set testfn "undefined function"

set testline "undefined line"

if { ![is_remote host] && [which $CC] == 0 } {

    verbose "Could not find C compiler!" 1

    untested $testund

    untested $testfn

    untested $testline

    return

}

if ![ld_compile "$CC -g" $srcdir/$subdir/undefined.c tmpdir/undefined.o] {

    verbose "Unable to compile test file!" 1

    unresolved $testund

    unresolved $testfn

    unresolved $testline

    return

}

remote_file host delete "tmpdir/undefined"

set flags [big_or_little_endian]

# Using -e start prevents the SunOS linker from trying to build a

# shared library.

send_log "$ld -e start $flags -o tmpdir/undefined tmpdir/undefined.o\n"

set exec_output [run_host_cmd "$ld" "-e start $flags -o tmpdir/undefined tmpdir/undefined.o"]

send_log "$exec_output\n"

verbose "$exec_output"

proc checkund { string testname } {

    global exec_output

    if [string match "*$string*" $exec_output] {

        pass $testname

    } else {

        fail $testname

    }

}

set mu "undefined reference to `*this_function_is_not_defined'"

checkund $mu $testund

# ARM PE defaults to using stabs debugging, which we can't handle for

# a COFF file.

#setup_xfail "arm*-*-pe*"

# For Xtensa on GNU Linux systems (or any other system where PIC code is

# always used), the address of the undefined function is in a literal pool

# outside the function, so that both the "undefined function" and "undefined

# line" tests fail.

setup_xfail xtensa*-*-linux*

set mf "tmpdir/undefined.o* In function `function':"

checkund $mf $testfn

if ![is_elf_format] {

    # COFF SH gets this test wrong--it reports line 10, because although

    # the jump is at line 9, the function address, and the reloc, is

    # stored at the end of the function.

    setup_xfail "sh-*-*"

    # ARM PE defaults to using stabs debugging, which we can't handle for

    # a COFF file.

    #setup_xfail "arm*-*-pe*"

}

set ml "undefined.c:9: undefined reference to `*this_function_is_not_defined'"

# With targets that use elf/dwarf2, such as the arm-elf

# toolchain, the code in bfd/elf.c:_bfd_elf_find_nearest_line() is called

# in order to locate the file name/line number where the undefined

# reference occurs.  Unfortunately this tries to use the dwarf2 debug

# information held in the .debug_info section.  This section contains a series

# of comp_unit structures, each of which has a low/high address range

# representing the span of memory locations covered by that structure.  The

# structures also index into other structures held in the .debug_line section

# and together they can translate memory locations back into file/function/line

# number addresses in the source code.  Since the information about the memory

# region covered by a comp_unit is only determined at link time, the low/high

# addresses in the .debug_info section and the line addresses in the .debug_line

# section are computed by generating relocs against known symbols in the object

# code.

#

# When the undefined reference is detected, the relocs in the dwarf2

# debug sections have not yet been resolved, so the low/high addresses and the

# line number address are all set at zero.  Thus when _bfd_elf_find_nearest_line()

# calls _bfd_dwarf2_find_nearest_line() no comp_unit can be found which

# actually covers the address where the reference occured, and so

# _bfd_elf_find_nearest_line() fails.

#

# The upshot of all of this, is that the error message reported by the

# linker, instead of having a source file name & line number as in:

#

#   undefined.c:9: undefined reference to `this_function_is_not_defined'

#

# has an object file & section address instead:

#

#   undefined.0(.text+0xc): undefined reference to `this_function_is_not_defined'

#

# hence the xfails below.

setup_xfail mcore-*-elf

setup_xfail mep-*-*

setup_xfail mips-sgi-irix6*

setup_xfail "sh64-*-*"

# The undefined test fails on 31 bit s/390 because the address of the

# function `this_function_is_not_defined' is stored in the literal pool of

# the function. Therefore the line number in the error message is 8 instead

# of 9. On 64 bit s/390 this works because of the new brasl instruction that

# doesn't need a literal pool entry.

setup_xfail s390-*-*

# See comments above for Xtensa.

setup_xfail xtensa*-*-linux*

setup_xfail hppa*64*-*-*

checkund $ml $testline