# Test handling of weak undefined symbols # Copyright (C) 2001-2019 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 } }