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# Copyright (C) 2002, 2003 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 2 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.

#

# This file was written by Janis Johnson, 

# Test interoperability of two compilers that follow the same ABI.

#

# Break simple tests into two pieces and see that they work when linked

# together.  If an alternate compiler is specified then the two main

# pieces of each test are compiled with different compilers.  The

# alternate compiler must be installed, and is specified by defining

# ALT_CC_UNDER_TEST in the environment.

if $tracelevel then {

    strace $tracelevel

}

global GCC_UNDER_TEST

# Load procedures from common libraries.

load_lib standard.exp

load_lib gcc.exp

#

# compat-use-alt-compiler -- make the alternate compiler the default

#

proc compat-use-alt-compiler { } {

    global GCC_UNDER_TEST ALT_CC_UNDER_TEST

    global same_alt

    # We don't need to do this if the alternate compiler is actually

    # the same as the compiler under test.

    if { $same_alt == 0 } then {

        set GCC_UNDER_TEST $ALT_CC_UNDER_TEST

    }

}

#

# compat-use-tst-compiler -- make compiler under test the default

#

proc compat-use-tst-compiler { } {

    global GCC_UNDER_TEST save_gcc_under_test

    global same_alt

    # We don't need to do this if the alternate compiler is actually

    # the same as the compiler under test.

    if { $same_alt == 0 } then {

        set GCC_UNDER_TEST $save_gcc_under_test

    }

}

# Load the language-independent compabibility support procedures.

# This must be done after the compat-use-*-compiler definitions.

load_lib compat.exp

gcc_init

# Save variables for the C compiler under test, which each test will

# change a couple of times.  This must be done after calling gcc-init.

set save_gcc_under_test $GCC_UNDER_TEST

# Define an identifier for use with this suite to avoid name conflicts

# with other compat tests running at the same time.

set sid "c_compat"

# Find out whether there is an alternate compiler to test.  If the

# variable is defined but is set to "same", that means we use the same

# compiler twice, which is meaningful if the two parts of COMPAT_OPTIONS

# are different.

set use_alt 0

set same_alt 0

if [info exists ALT_CC_UNDER_TEST] then {

    set use_alt 1

    if [string match "same" $ALT_CC_UNDER_TEST] then {

        set same_alt 1

    }

}

# Main loop.

foreach src [lsort [find $srcdir/$subdir *_main.c]] {

    # If we're only testing specific files and this isn't one of them, skip it.

    if ![runtest_file_p $runtests $src] then {

        continue

    }

    compat-execute $src $sid $use_alt

}

# Restore the original compiler under test.

compat-use-tst-compiler