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# Test that the linker reports undefined symbol errors correctly.
# By Ian Lance Taylor, Cygnus Support
#
# Copyright (C) 1995-2017 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 occurred, 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-*-*"
# Fails for the MSP430 because it uses SYM_DIFF relocs but it does
# not provide a special_function for handling them. If optimization
# is enabled then this test passes because function()'s prologue is
# eliminated.
setup_xfail "msp430-*-*"
# 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
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