# Copyright (C) 2005-2021 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
# 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 GCC; see the file COPYING3.  If not see
# <http://www.gnu.org/licenses/>.

# Run GCC with the input file also specified as output file. Check that the
# compiler prints an error message and does not overwrite the input file.

load_lib gcc-defs.exp
load_lib target-supports.exp

# These tests don't run runtest_file_p consistently if it
# doesn't return the same values, so disable parallelization
# of this *.exp file.  The first parallel runtest to reach
# this will run all the tests serially.
if ![gcc_parallel_test_run_p output] {
    return
}

# I'm not sure if this is needed here. It was in options.exp.
gcc_parallel_test_enable 0

proc check_gcc_overwrite_input {} {
    set filename test-[pid]
    set fd [open $filename.c w]
    puts $fd "int main (void) \{ return 0; \}"
    close $fd
    remote_download host $filename.c
    set test "input overwrite test"
    set compiler cc1
    set gcc_output [gcc_target_compile $filename.c $filename.c executable ""]
    
    # Is this right, or do I need to use something like remote_upload?
    set fd [open $filename.c r]
    set file_data [read $fd]
    close $fd
    remote_file build delete $filename.c

    # check if the contents of the input file has changed
    if {!($file_data eq "int main (void) \{ return 0; \}\n")} {
	fail "$test (input overwritten)"
	return
    }
    
    # check if the error message was printed
    if {![regexp -- "same as output" $gcc_output]} {
	fail "$test (no error printed)"
	return
    }
    pass $test
}

check_gcc_overwrite_input

gcc_parallel_test_enable 1