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# Test handling of weak undefined symbols
# Copyright (C) 2001-2020 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.
# The linker should accept references to undefined weaks without error,
# and resolve them to zero in a static executable. Ought to work for
# some a.out targets too.
set testname "weak undefined data symbols"
if { ![is_elf_format] && ![is_pecoff_format] } then {
unsupported $testname
} elseif {![ld_assemble $as $srcdir/$subdir/weak-undef.s \
tmpdir/weak-undef.o]} then {
# It's OK if .weak doesn't work on this target.
unresolved $testname
} elseif {![ld_link $ld tmpdir/weak-undef \
"tmpdir/weak-undef.o -T $srcdir/$subdir/weak-undef.t"]} then {
# Weak symbols are broken for non-i386 PE targets.
if {! [istarget i?86-*-*]} {
setup_xfail *-*-pe*
}
fail $testname
} elseif {![is_remote host] && [which $objdump] == 0} then {
unresolved $testname
} else {
set exec_output [run_host_cmd "$objdump" "-s tmpdir/weak-undef"]
set exec_output [prune_warnings $exec_output]
verbose -log $exec_output
set output_regexp ".*Contents of section .data:.*0000 00000000 11111111.*"
if {[regexp $output_regexp $exec_output]} then {
pass $testname
} else {
fail $testname
}
}
proc undef_weak_so { testname opts passval } {
global ld
global nm
if {![ld_link $ld tmpdir/weak-fundef.so \
"$opts tmpdir/weak-fundef.o"]} then {
fail $testname
} elseif {![is_remote host] && [which $nm] == 0} then {
unresolved $testname
} else {
set exec_output [run_host_cmd "$nm" "-D tmpdir/weak-fundef.so"]
set exec_output [prune_warnings $exec_output]
set output_regexp ".*w undef_weak_fun.*"
if {[regexp $output_regexp $exec_output] == $passval} then {
pass $testname
} else {
fail $testname
}
return 1
}
return 0
}
proc undef_weak_exe { testname opts passval } {
global ld
global nm
if {![ld_link $ld tmpdir/weak-fundef \
"$opts tmpdir/weak-fundef.o tmpdir/weak-fundef.so"]} then {
fail $testname
} elseif {![is_remote host] && [which $nm] == 0} then {
unresolved $testname
} else {
set exec_output [run_host_cmd "$nm" "-D tmpdir/weak-fundef"]
set exec_output [prune_warnings $exec_output]
set output_regexp ".*w undef_weak_fun.*"
if {[regexp $output_regexp $exec_output] == $passval} then {
pass $testname
} else {
fail $testname
}
}
}
# When linking a shared lib, weak undefined symbols should become dynamic.
set testname "weak undefined function symbols in shared lib"
set asflags ""
switch -glob $target_triplet {
aarch64* -
arm* -
powerpc* { set asflags "--defsym BL=1" }
hppa* { set asflags "--defsym HPPA=1" }
i\[3-7\]86* -
x86_64* { set asflags "--defsym CALLPLT=1" }
}
if { $asflags == "" || ![is_elf_format] || ![check_shared_lib_support]} then {
unsupported $testname
} elseif {![ld_assemble $as "$asflags $srcdir/$subdir/weak-fundef.s" \
tmpdir/weak-fundef.o]} then {
fail $testname
} elseif { [undef_weak_so $testname "--shared" 1] } then {
# When linking a dynamic executable, weak undefined symbols become dynamic.
set testname "weak undefined function symbols in dynamic exe"
undef_weak_exe $testname "--no-as-needed" 1
# Find -z options supported by the default emulation
set emul [get_target_emul]
set cmd [list "$ld --help 2>&1 | sed -e '1,/^$emul:/d;/^\[^ \]*:/,\$d'"]
set status [remote_exec host [concat sh -c $cmd]]
if { [lindex $status 0] != 0 } {
verbose -log "$cmd exited with status [lindex $status 0]"
}
set emulopt [lindex $status 1]
if { [string first "dynamic-undefined-weak" $emulopt] >= 0 } {
# -z dynamic-undefined-weak is supported. Let's see if it works.
set testname "weak undefined functions in shared lib, no dyn undef weak"
undef_weak_so $testname "--shared -z nodynamic-undefined-weak" 0
set testname "weak undefined functions in shared lib, dyn undef weak"
undef_weak_so $testname "--shared -z dynamic-undefined-weak" 1
set testname "weak undefined functions in dynamic exe, no dyn undef weak"
undef_weak_exe $testname "-z nodynamic-undefined-weak" 0
set testname "weak undefined functions in dynamic exe, dyn undef weak"
undef_weak_exe $testname "-z dynamic-undefined-weak" 1
set testname "weak undefined functions in pie, no dyn undef weak"
undef_weak_exe $testname "-pie -z nodynamic-undefined-weak" 0
set testname "weak undefined functions in pie, dyn undef weak"
undef_weak_exe $testname "-pie -z dynamic-undefined-weak" 1
}
}
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