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# Copyright 2018-2021 Free Software Foundation, Inc.
# 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
# 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, see <>.
# This tests some non-standard DWARF spotted in an Intel C Compiler
# generated binary.
# The DWARF standard (V5 3.3.2) says that a void C function should not
# have a DW_AT_type attribute, however, an ICC compiled binary was
# found to have a DW_AT_type that referenced a signed integer type, of
# size 0, with the name 'void'.
# This 'void' integer type would cause GDB to crash in some cases, one
# that was seen was when using 'finish' to leave the void function.
load_lib dwarf.exp
# This test can only be run on targets which support DWARF-2 and use gas.
if {![dwarf2_support]} {
return 0
standard_testfile .c .S
# Make some DWARF for the test.
set asm_file [standard_output_file $srcfile2]
Dwarf::assemble $asm_file {
global srcfile
cu {} {
DW_TAG_compile_unit {
{DW_AT_producer "Intel(R) C Intel(R) 64 Compiler XE for applications running on Intel(R) 64, Version Build 20150212"}
{DW_AT_language @DW_LANG_C}
{DW_AT_name $srcfile}
{DW_AT_comp_dir /tmp}
} {
declare_labels int_type void_type ptr_type
int_type: DW_TAG_base_type {
{DW_AT_byte_size 4 DW_FORM_sdata}
{DW_AT_encoding @DW_ATE_signed}
{DW_AT_name int}
void_type: DW_TAG_base_type {
{DW_AT_byte_size 0 DW_FORM_sdata}
{DW_AT_encoding @DW_ATE_signed}
{DW_AT_name void}
ptr_type: DW_TAG_pointer_type {
{DW_AT_type :$void_type}
DW_TAG_subprogram {
{MACRO_AT_func {func}}
{type :$void_type}
DW_TAG_subprogram {
{MACRO_AT_func {main}}
{type :$int_type}
DW_TAG_variable {
{DW_AT_name "var_a"}
{DW_AT_type :$int_type}
{DW_AT_external 1 DW_FORM_flag}
{DW_AT_location {DW_OP_addr [gdb_target_symbol "var_a"]} SPECIAL_expr}
DW_TAG_variable {
{DW_AT_name "var_ptr"}
{DW_AT_type :$ptr_type}
{DW_AT_external 1 DW_FORM_flag}
{DW_AT_location {DW_OP_addr [gdb_target_symbol "var_ptr"]} SPECIAL_expr}
if { [prepare_for_testing "failed to prepare" ${testfile} \
[list $srcfile $asm_file] {nodebug}] } {
return -1
if ![runto_main] {
return -1
# Place a breakpoint in 'func' and continue to there.
gdb_breakpoint func
gdb_continue_to_breakpoint "func"
# Check how GDB handles the void* variable.
gdb_test "p *var_ptr" "Attempt to dereference a generic pointer." \
"check that dereferencing a void* gives a suitable message"
# Now finish, returning to main.
gdb_test "finish" [multi_line \
"Run till exit from #0 $hex in func \\\(\\\)" \
"$hex in main \\\(\\\)"] \
"check that finish completes"