# Copyright 2020 Google, Inc.
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Import('*')

from gem5_scons import warning

import gem5_scons

with gem5_scons.Configure(main) as conf:
    # Check for <fenv.h> (C99 FP environment control)
    conf.env['HAVE_FENV'] = conf.CheckHeader('fenv.h', '<>')

    if not conf.env['HAVE_FENV']:
        warning("Header file <fenv.h> not found.\n"
                "This host has no IEEE FP rounding mode control.")

    # Check for <png.h> (libpng library needed if wanting to dump
    # frame buffer image in png format)
    conf.env['HAVE_PNG'] = conf.CheckHeader('png.h', '<>')

    if not conf.env['HAVE_PNG']:
        warning("Header file <png.h> not found.\n"
                "This host has no libpng library.\n"
                "Disabling support for PNG framebuffers.")

    have_posix_clock = \
        conf.CheckLibWithHeader([None, 'rt'], 'time.h', 'C',
                                'clock_nanosleep(0,0,NULL,NULL);')
    if not have_posix_clock:
        warning("Can't find library for POSIX clocks.")

    # Valgrind gets much less confused if you tell it when you're using
    # alternative stacks.
    conf.env['HAVE_VALGRIND'] = conf.CheckCHeader('valgrind/valgrind.h')


# Check if the compiler supports the [[gnu::deprecated]] attribute
# Create a temporary environment with -Werror in CCFLAGS
werror_env = main.Clone()
werror_env.Append(CCFLAGS=['-Werror'])
with gem5_scons.Configure(werror_env) as conf:

    # Store result in the main environment
    main['HAVE_DEPRECATED_NAMESPACE'] = conf.TryCompile('''
        int main() {return 0;}
        namespace [[gnu::deprecated("Test namespace deprecation")]]
        test_deprecated_namespace {}
    ''', '.cc')

    if not main['HAVE_DEPRECATED_NAMESPACE']:
        warning("Deprecated namespaces are not supported by this compiler.\n"
                "Please make sure to check the mailing list for deprecation "
                "announcements.")

sticky_vars.Add(BoolVariable('USE_POSIX_CLOCK', 'Use POSIX Clocks',
                             have_posix_clock))


export_vars.extend([
        'HAVE_FENV', 'HAVE_PNG', 'USE_POSIX_CLOCK', 'HAVE_VALGRIND',
        'HAVE_DEPRECATED_NAMESPACE'])