127 lines
4.5 KiB
Text
127 lines
4.5 KiB
Text
# Test that the linker reports undefined symbol errors correctly.
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# By Ian Lance Taylor, Cygnus Support
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#
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# Copyright (C) 1995, 1996, 1997 Free Software Foundation
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#
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# This file is free software; you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation; either version 2 of the License, or
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# (at your option) any later version.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program; if not, write to the Free Software
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# Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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set testund "undefined"
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set testfn "undefined function"
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set testline "undefined line"
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if { [which $CC] == 0 } {
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verbose "Could not find C compiler!" 1
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untested $testund
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untested $testfn
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untested $testline
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return
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}
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if ![ld_compile "$CC -g" $srcdir/$subdir/undefined.c tmpdir/undefined.o] {
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verbose "Unable to compile test file!" 1
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unresolved $testund
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unresolved $testfn
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unresolved $testline
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return
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}
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catch "exec rm -f tmpdir/undefined" exec_output
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# Using -e start prevents the SunOS linker from trying to build a
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# shared library.
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send_log "$ld -e start -o tmpdir/undefined tmpdir/undefined.o\n"
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verbose "$ld -e start -o tmpdir/undefined tmpdir/undefined.o"
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catch "exec $ld -e start -o tmpdir/undefined tmpdir/undefined.o" exec_output
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send_log "$exec_output\n"
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verbose "$exec_output"
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proc checkund { string testname } {
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global exec_output
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if [string match "*$string*" $exec_output] {
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pass $testname
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} else {
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fail $testname
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}
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}
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set mu "undefined reference to `this_function_is_not_defined'"
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checkund $mu $testund
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# ARM PE defaults to using stabs debugging, which we can't handle for
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# a COFF file.
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#setup_xfail "arm*-*-pe*"
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#setup_xfail "thumb*-*-pe*"
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# Just doesn't work for PA ELF. No clue why.
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setup_xfail "hppa*-*-*elf*"
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set mf "tmpdir/undefined.o: In function `function':"
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checkund $mf $testfn
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# COFF SH gets this test wrong--it reports line 10, because although
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# the jump is at line 9, the function address, and the reloc, is
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# stored at the end of the function.
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setup_xfail "sh-*-*"
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# ARM PE defaults to using stabs debugging, which we can't handle for
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# a COFF file.
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#setup_xfail "arm*-*-pe*"
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#setup_xfail "thumb*-*-pe*"
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# Just doesn't work for PA ELF. No clue why.
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setup_xfail "hppa*-*-*elf*"
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set ml "undefined.c:9: undefined reference to `this_function_is_not_defined'"
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# With targets that use elf/dwarf2, such as the arm-elf and thumb-elf
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# toolchains, the code in bfd/elf.c:_bfd_elf_find_nearest_line() is called
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# in order to locate the file name/line number where the undefined
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# reference occurs. Unfortunately this tries to use the dwarf2 debug
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# information held in the .debug_info section. This section contains a series
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# of comp_unit structures, each of which has a low/high address range
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# representing the span of memory locations covered by that structure. The
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# structures also index into other structures held in the .debug_line section
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# and together they can translate memory locations back into file/function/line
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# number addresses in the source code. Since the information about the memory
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# region covered by a comp_unit is only determined at link time, the low/high
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# addresses in the .debug_info section and the line addresses in the .debug_line
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# section are computed by generating relocs against known symbols in the object
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# code.
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#
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# When the undefined reference is detected, the relocs in the dwarf2
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# debug sections have not yet been resolved, so the low/high addresses and the
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# line number address are all set at zero. Thus when _bfd_elf_find_nearest_line()
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# calls _bfd_dwarf2_find_nearest_line() no comp_unit can be found which
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# actually covers the address where the reference occured, and so
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# _bfd_elf_find_nearest_line() fails.
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#
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# The upshot of all of this, is that the error message reported by the
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# linker, instead of having a source file name & line number as in:
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#
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# undefined.c:9: undefined reference to `this_function_is_not_defined'
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#
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# has an object file & section address instead:
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#
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# undefined.0(.text+0xc): undefined reference to `this_function_is_not_defined'
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#
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# hence the xfails below.
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setup_xfail arm-*-elf
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setup_xfail strongarm-*-elf
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setup_xfail thumb-*-elf
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setup_xfail mcore-*-elf
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checkund $ml $testline
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