project(
    'libmctp', 'c',
    meson_version: '>= 1.1',
    version: '0.11',
    default_options: [
        'debug=true',
        'optimization=g',
        'warning_level=2',
        'werror=true',
        'tests=' + (meson.is_subproject() ? 'disabled' : 'enabled'),
    ],
)

sources = [
     'core.c',
     'alloc.c',
]

headers = [
    'libmctp.h',
]

serial_sources = [
    'serial.c',
    'crc-16-ccitt.c',
]

serial_headers = [
    'libmctp-serial.h'
]

astlpc_sources = [
    'astlpc.c',
    'crc32.c',
]

astlpc_headers = [
    'libmctp-astlpc.h',
]

i2c_sources = [
    'i2c.c',
]

i2c_headers = [
    'libmctp-i2c.h',
]

libmctp_sources = sources
libmctp_headers = headers

if get_option('bindings').contains('serial')
    libmctp_sources += serial_sources
    libmctp_headers += serial_headers
endif
if get_option('bindings').contains('astlpc')
    libmctp_sources += astlpc_sources
    libmctp_headers += astlpc_headers
endif
if get_option('bindings').contains('i2c')
    libmctp_sources += i2c_sources
    libmctp_headers += i2c_headers
endif

compiler = meson.get_compiler('c')

if not get_option('custom_alloc') and get_option('default_alloc').require(
    compiler.links('''
        #include <stdlib.h>
        void main()
        {
            free(malloc(4096));
        }
    ''')).allowed()
    add_project_arguments('-DMCTP_DEFAULT_ALLOC', language : 'c')
endif

if get_option('custom_alloc')
    add_project_arguments('-DMCTP_CUSTOM_ALLOC', language : 'c')
endif

if get_option('nolog')
    add_project_arguments('-DMCTP_NOLOG', language : 'c')
else
    libmctp_sources += ['log.c']
endif

feat_fileio = get_option('fileio').require(
    compiler.links('''
        #include <poll.h>
        #include <unistd.h>
        void main()
        {
            poll(NULL, 0, -1);
        }
    '''))
if feat_fileio.allowed()
    add_project_arguments('-DMCTP_HAVE_FILEIO', language : 'c')
endif

if get_option('syslog').require(
    compiler.links('''
        #include <stdarg.h>
        #include <syslog.h>
        void check_vsyslog(int level, const char *fmt, ...)
        {
            va_list ap;
            va_start(ap, fmt);
            vsyslog(0, fmt, ap);
            va_end(ap);
        }
        void main()
        {
            check_vsyslog(0, "\n");
        }
        ''')).allowed()
    add_project_arguments('-DMCTP_HAVE_SYSLOG', language : 'c')
endif

if get_option('stdio').require(
    compiler.links('''
        #include <stdarg.h>
        #include <stdio.h>
        void check_vsyslog(const char *fmt, ...)
        {
            va_list ap;
            va_start(ap, fmt);
            vprintf(fmt, ap);
            va_end(ap);
        }
        void main()
        {
            check_vsyslog("\n");
        }
        ''')).allowed()
    add_project_arguments('-DMCTP_HAVE_STDIO', language : 'c')
endif

# pcap is necessary for mctp-demux-daemon to be functional
pcap_dep = dependency('libpcap', required: false)

systemd_dep = dependency('systemd', required: false)
libsystemd_dep = dependency('libsystemd', required: false)

libmctp_include_dir = include_directories('.', is_system: true)
libmctp = library('mctp',
    libmctp_sources,
    include_directories: libmctp_include_dir,
    version: meson.project_version(),
    install: true,
)
install_headers(libmctp_headers)

if systemd_dep.found()
    unitdir = systemd_dep.get_variable(pkgconfig: 'systemdsystemunitdir')
    install_data('systemd/system/mctp-demux.service', install_dir: unitdir)
    install_data('systemd/system/mctp-demux.socket', install_dir: unitdir)
endif

import('pkgconfig').generate(libmctp,
    name: 'libmctp',
    description: 'MCTP protocol implementation',
    version: meson.project_version(),
)

libmctp_dep = declare_dependency(
    include_directories: libmctp_include_dir,
    link_with: libmctp,
)

# TODO: these should depend on the -internal.h headers so they rebuild
# on changes, unclear how to do that.
sizeof_mctp = compiler.sizeof('struct mctp',
    include_directories: libmctp_include_dir,
    prefix: '#include "core-internal.h"')
sizeof_binding_i2c = compiler.sizeof('struct mctp_binding_i2c',
    include_directories: libmctp_include_dir,
    prefix: '#include "i2c-internal.h"')
sizes_h = configure_file(configuration: {
        'sizeof_struct_mctp': sizeof_mctp,
        'sizeof_binding_i2c': sizeof_binding_i2c,
    },
    input: 'libmctp-sizes.h.in',
    output: 'libmctp-sizes.h',
    )
install_headers(sizes_h)

if feat_fileio.allowed()
    subdir('utils')
endif

if get_option('tests').allowed()
    subdir('tests')
endif