meson.build

project('qemu', ['c'], meson_version: '>=0.59.3',
        default_options: ['warning_level=1', 'c_std=gnu11', 'cpp_std=gnu++11', 'b_colorout=auto',
                          'b_staticpic=false', 'stdsplit=false', 'optimization=2', 'b_pie=true'],
        version: files('VERSION'))

add_test_setup('quick', exclude_suites: ['slow', 'thorough'], is_default: true)
add_test_setup('slow', exclude_suites: ['thorough'], env: ['G_TEST_SLOW=1', 'SPEED=slow'])
add_test_setup('thorough', env: ['G_TEST_SLOW=1', 'SPEED=thorough'])

meson.add_postconf_script(find_program('scripts/symlink-install-tree.py'))

not_found = dependency('', required: false)
keyval = import('keyval')
ss = import('sourceset')
fs = import('fs')

sh = find_program('sh')
cc = meson.get_compiler('c')
config_host = keyval.load(meson.current_build_dir() / 'config-host.mak')
enable_modules = 'CONFIG_MODULES' in config_host
enable_static = 'CONFIG_STATIC' in config_host

# Allow both shared and static libraries unless --enable-static
static_kwargs = enable_static ? {'static': true} : {}

# Temporary directory used for files created while
# configure runs. Since it is in the build directory
# we can safely blow away any previous version of it
# (and we need not jump through hoops to try to delete
# it when configure exits.)
tmpdir = meson.current_build_dir() / 'meson-private/temp'

if get_option('qemu_suffix').startswith('/')
  error('qemu_suffix cannot start with a /')
endif

qemu_confdir = get_option('sysconfdir') / get_option('qemu_suffix')
qemu_datadir = get_option('datadir') / get_option('qemu_suffix')
qemu_docdir = get_option('docdir') / get_option('qemu_suffix')
qemu_moddir = get_option('libdir') / get_option('qemu_suffix')

qemu_desktopdir = get_option('datadir') / 'applications'
qemu_icondir = get_option('datadir') / 'icons'

config_host_data = configuration_data()
genh = []
qapi_trace_events = []

bsd_oses = ['gnu/kfreebsd', 'freebsd', 'netbsd', 'openbsd', 'dragonfly', 'darwin']
supported_oses = ['windows', 'freebsd', 'netbsd', 'openbsd', 'darwin', 'sunos', 'linux']
supported_cpus = ['ppc', 'ppc64', 's390x', 'riscv', 'x86', 'x86_64',
  'arm', 'aarch64', 'loongarch64', 'mips', 'mips64', 'sparc', 'sparc64']

cpu = host_machine.cpu_family()

# Unify riscv* to a single family.
if cpu in ['riscv32', 'riscv64']
  cpu = 'riscv'
endif

targetos = host_machine.system()

target_dirs = config_host['TARGET_DIRS'].split()
have_linux_user = false
have_bsd_user = false
have_system = false
foreach target : target_dirs
  have_linux_user = have_linux_user or target.endswith('linux-user')
  have_bsd_user = have_bsd_user or target.endswith('bsd-user')
  have_system = have_system or target.endswith('-softmmu')
endforeach
have_user = have_linux_user or have_bsd_user
have_tools = get_option('tools') \
  .disable_auto_if(not have_system) \
  .allowed()
have_ga = get_option('guest_agent') \
  .disable_auto_if(not have_system and not have_tools) \
  .require(targetos in ['sunos', 'linux', 'windows'],
           error_message: 'unsupported OS for QEMU guest agent') \
  .allowed()
have_block = have_system or have_tools

python = import('python').find_installation()

if cpu not in supported_cpus
  host_arch = 'unknown'
elif cpu == 'x86'
  host_arch = 'i386'
elif cpu == 'mips64'
  host_arch = 'mips'
else
  host_arch = cpu
endif

if cpu in ['x86', 'x86_64']
  kvm_targets = ['i386-softmmu', 'x86_64-softmmu']
elif cpu == 'aarch64'
  kvm_targets = ['aarch64-softmmu']
elif cpu == 's390x'
  kvm_targets = ['s390x-softmmu']
elif cpu in ['ppc', 'ppc64']
  kvm_targets = ['ppc-softmmu', 'ppc64-softmmu']
elif cpu in ['mips', 'mips64']
  kvm_targets = ['mips-softmmu', 'mipsel-softmmu', 'mips64-softmmu', 'mips64el-softmmu']
elif cpu in ['riscv']
  kvm_targets = ['riscv32-softmmu', 'riscv64-softmmu']
else
  kvm_targets = []
endif

kvm_targets_c = '""'
if get_option('kvm').allowed() and targetos == 'linux'
  kvm_targets_c = '"' + '" ,"'.join(kvm_targets) + '"'
endif
config_host_data.set('CONFIG_KVM_TARGETS', kvm_targets_c)

accelerator_targets = { 'CONFIG_KVM': kvm_targets }

if cpu in ['aarch64']
  accelerator_targets += {
    'CONFIG_HVF': ['aarch64-softmmu']
  }
endif

if cpu in ['x86', 'x86_64', 'arm', 'aarch64']
  # i386 emulator provides xenpv machine type for multiple architectures
  accelerator_targets += {
    'CONFIG_XEN': ['i386-softmmu', 'x86_64-softmmu'],
  }
endif
if cpu in ['x86', 'x86_64']
  accelerator_targets += {
    'CONFIG_HAX': ['i386-softmmu', 'x86_64-softmmu'],
    'CONFIG_HVF': ['x86_64-softmmu'],
    'CONFIG_NVMM': ['i386-softmmu', 'x86_64-softmmu'],
    'CONFIG_WHPX': ['i386-softmmu', 'x86_64-softmmu'],
  }
endif

modular_tcg = []
# Darwin does not support references to thread-local variables in modules
if targetos != 'darwin'
  modular_tcg = ['i386-softmmu', 'x86_64-softmmu']
endif

edk2_targets = [ 'arm-softmmu', 'aarch64-softmmu', 'i386-softmmu', 'x86_64-softmmu' ]
unpack_edk2_blobs = false
foreach target : edk2_targets
  if target in target_dirs
    bzip2 = find_program('bzip2', required: get_option('install_blobs'))
    unpack_edk2_blobs = bzip2.found()
    break
  endif
endforeach

dtrace = not_found
stap = not_found
if 'dtrace' in get_option('trace_backends')
  dtrace = find_program('dtrace', required: true)
  stap = find_program('stap', required: false)
  if stap.found()
    # Workaround to avoid dtrace(1) producing a file with 'hidden' symbol
    # visibility. Define STAP_SDT_V2 to produce 'default' symbol visibility
    # instead. QEMU --enable-modules depends on this because the SystemTap
    # semaphores are linked into the main binary and not the module's shared
    # object.
    add_global_arguments('-DSTAP_SDT_V2',
                         native: false, language: ['c', 'cpp', 'objc'])
  endif
endif

if get_option('iasl') == ''
  iasl = find_program('iasl', required: false)
else
  iasl = find_program(get_option('iasl'), required: true)
endif

##################
# Compiler flags #
##################

qemu_cflags = config_host['QEMU_CFLAGS'].split()
qemu_cxxflags = config_host['QEMU_CXXFLAGS'].split()
qemu_objcflags = config_host['QEMU_OBJCFLAGS'].split()
qemu_ldflags = config_host['QEMU_LDFLAGS'].split()

if targetos == 'windows'
  qemu_ldflags += cc.get_supported_link_arguments('-Wl,--no-seh', '-Wl,--nxcompat')
  # Disable ASLR for debug builds to allow debugging with gdb
  if get_option('optimization') == '0'
    qemu_ldflags += cc.get_supported_link_arguments('-Wl,--dynamicbase')
  endif
endif

if get_option('gprof')
  qemu_cflags += ['-p']
  qemu_cxxflags += ['-p']
  qemu_objcflags += ['-p']
  qemu_ldflags += ['-p']
endif

# Specify linker-script with add_project_link_arguments so that it is not placed
# within a linker --start-group/--end-group pair
if get_option('fuzzing')
  add_project_link_arguments(['-Wl,-T,',
                              (meson.current_source_dir() / 'tests/qtest/fuzz/fork_fuzz.ld')],
                             native: false, language: ['c', 'cpp', 'objc'])

  # Specify a filter to only instrument code that is directly related to
  # virtual-devices.
  configure_file(output: 'instrumentation-filter',
                 input: 'scripts/oss-fuzz/instrumentation-filter-template',
                 copy: true)

  if cc.compiles('int main () { return 0; }',
                  name: '-fsanitize-coverage-allowlist=/dev/null',
                 args: ['-fsanitize-coverage-allowlist=/dev/null',
                        '-fsanitize-coverage=trace-pc'] )
    add_global_arguments('-fsanitize-coverage-allowlist=instrumentation-filter',
                         native: false, language: ['c', 'cpp', 'objc'])
  endif

  if get_option('fuzzing_engine') == ''
    # Add CFLAGS to tell clang to add fuzzer-related instrumentation to all the
    # compiled code.  To build non-fuzzer binaries with --enable-fuzzing, link
    # everything with fsanitize=fuzzer-no-link. Otherwise, the linker will be
    # unable to bind the fuzzer-related callbacks added by instrumentation.
    add_global_arguments('-fsanitize=fuzzer-no-link',
                         native: false, language: ['c', 'cpp', 'objc'])
    add_global_link_arguments('-fsanitize=fuzzer-no-link',
                              native: false, language: ['c', 'cpp', 'objc'])
    # For the actual fuzzer binaries, we need to link against the libfuzzer
    # library. They need to be configurable, to support OSS-Fuzz
    fuzz_exe_ldflags = ['-fsanitize=fuzzer']
  else
    # LIB_FUZZING_ENGINE was set; assume we are running on OSS-Fuzz, and
    # the needed CFLAGS have already been provided
    fuzz_exe_ldflags = get_option('fuzzing_engine').split()
  endif
endif

add_global_arguments(qemu_cflags, native: false, language: ['c'])
add_global_arguments(qemu_cxxflags, native: false, language: ['cpp'])
add_global_arguments(qemu_objcflags, native: false, language: ['objc'])
add_global_link_arguments(qemu_ldflags, native: false, language: ['c', 'cpp', 'objc'])

if targetos == 'linux'
  add_project_arguments('-isystem', meson.current_source_dir() / 'linux-headers',
                        '-isystem', 'linux-headers',
                        language: ['c', 'cpp'])
endif

add_project_arguments('-iquote', '.',
                      '-iquote', meson.current_source_dir(),
                      '-iquote', meson.current_source_dir() / 'include',
                      language: ['c', 'cpp', 'objc'])

link_language = meson.get_external_property('link_language', 'cpp')
if link_language == 'cpp'
  add_languages('cpp', required: true, native: false)
  cxx = meson.get_compiler('cpp')
  linker = cxx
else
  linker = cc
endif
if host_machine.system() == 'darwin'
  add_languages('objc', required: false, native: false)
endif

sparse = find_program('cgcc', required: get_option('sparse'))
if sparse.found()
  run_target('sparse',
             command: [find_program('scripts/check_sparse.py'),
                       'compile_commands.json', sparse.full_path(), '-Wbitwise',
                       '-Wno-transparent-union', '-Wno-old-initializer',
                       '-Wno-non-pointer-null'])
endif

###########################################
# Target-specific checks and dependencies #
###########################################

# Fuzzing
if get_option('fuzzing') and get_option('fuzzing_engine') == '' and \
    not cc.links('''
          #include <stdint.h>
          #include <sys/types.h>
          int LLVMFuzzerTestOneInput(const uint8_t *Data, size_t Size);
          int LLVMFuzzerTestOneInput(const uint8_t *Data, size_t Size) { return 0; }
        ''',
        args: ['-Werror', '-fsanitize=fuzzer'])
  error('Your compiler does not support -fsanitize=fuzzer')
endif

# Tracing backends
if 'ftrace' in get_option('trace_backends') and targetos != 'linux'
  error('ftrace is supported only on Linux')
endif
if 'syslog' in get_option('trace_backends') and not cc.compiles('''
    #include <syslog.h>
    int main(void) {
        openlog("qemu", LOG_PID, LOG_DAEMON);
        syslog(LOG_INFO, "configure");
        return 0;
    }''')
  error('syslog is not supported on this system')
endif

# Miscellaneous Linux-only features
get_option('mpath') \
  .require(targetos == 'linux', error_message: 'Multipath is supported only on Linux')

multiprocess_allowed = get_option('multiprocess') \
  .require(targetos == 'linux', error_message: 'Multiprocess QEMU is supported only on Linux') \
  .allowed()

vfio_user_server_allowed = get_option('vfio_user_server') \
  .require(targetos == 'linux', error_message: 'vfio-user server is supported only on Linux') \
  .allowed()

have_tpm = get_option('tpm') \
  .require(targetos != 'windows', error_message: 'TPM emulation only available on POSIX systems') \
  .allowed()

# vhost
have_vhost_user = get_option('vhost_user') \
  .disable_auto_if(targetos != 'linux') \
  .require(targetos != 'windows',
           error_message: 'vhost-user is not available on Windows').allowed()
have_vhost_vdpa = get_option('vhost_vdpa') \
  .require(targetos == 'linux',
           error_message: 'vhost-vdpa is only available on Linux').allowed()
have_vhost_kernel = get_option('vhost_kernel') \
  .require(targetos == 'linux',
           error_message: 'vhost-kernel is only available on Linux').allowed()
have_vhost_user_crypto = get_option('vhost_crypto') \
  .require(have_vhost_user,
           error_message: 'vhost-crypto requires vhost-user to be enabled').allowed()

have_vhost = have_vhost_user or have_vhost_vdpa or have_vhost_kernel

have_vhost_net_user = have_vhost_user and get_option('vhost_net').allowed()
have_vhost_net_vdpa = have_vhost_vdpa and get_option('vhost_net').allowed()
have_vhost_net_kernel = have_vhost_kernel and get_option('vhost_net').allowed()
have_vhost_net = have_vhost_net_kernel or have_vhost_net_user or have_vhost_net_vdpa

# Target-specific libraries and flags
libm = cc.find_library('m', required: false)
threads = dependency('threads')
util = cc.find_library('util', required: false)
winmm = []
socket = []
version_res = []
coref = []
iokit = []
emulator_link_args = []
nvmm =not_found
hvf = not_found
midl = not_found
widl = not_found
pathcch = not_found
host_dsosuf = '.so'
if targetos == 'windows'
  midl = find_program('midl', required: false)
  widl = find_program('widl', required: false)
  pathcch = cc.find_library('pathcch')
  socket = cc.find_library('ws2_32')
  winmm = cc.find_library('winmm')

  win = import('windows')
  version_res = win.compile_resources('version.rc',
                                      depend_files: files('pc-bios/qemu-nsis.ico'),
                                      include_directories: include_directories('.'))
  host_dsosuf = '.dll'
elif targetos == 'darwin'
  coref = dependency('appleframeworks', modules: 'CoreFoundation')
  iokit = dependency('appleframeworks', modules: 'IOKit', required: false)
  host_dsosuf = '.dylib'
elif targetos == 'sunos'
  socket = [cc.find_library('socket'),
            cc.find_library('nsl'),
            cc.find_library('resolv')]
elif targetos == 'haiku'
  socket = [cc.find_library('posix_error_mapper'),
            cc.find_library('network'),
            cc.find_library('bsd')]
elif targetos == 'openbsd'
  if get_option('tcg').allowed() and target_dirs.length() > 0
    # Disable OpenBSD W^X if available
    emulator_link_args = cc.get_supported_link_arguments('-Wl,-z,wxneeded')
  endif
endif

# Target-specific configuration of accelerators
accelerators = []
if get_option('kvm').allowed() and targetos == 'linux'
  accelerators += 'CONFIG_KVM'
endif
if get_option('whpx').allowed() and targetos == 'windows'
  if get_option('whpx').enabled() and host_machine.cpu() != 'x86_64'
    error('WHPX requires 64-bit host')
  elif cc.has_header('WinHvPlatform.h', required: get_option('whpx')) and \
       cc.has_header('WinHvEmulation.h', required: get_option('whpx'))
    accelerators += 'CONFIG_WHPX'
  endif
endif
if get_option('hvf').allowed()
  hvf = dependency('appleframeworks', modules: 'Hypervisor',
                   required: get_option('hvf'))
  if hvf.found()
    accelerators += 'CONFIG_HVF'
  endif
endif
if get_option('hax').allowed()
  if get_option('hax').enabled() or targetos in ['windows', 'darwin', 'netbsd']
    accelerators += 'CONFIG_HAX'
  endif
endif
if targetos == 'netbsd'
  nvmm = cc.find_library('nvmm', required: get_option('nvmm'))
  if nvmm.found()
    accelerators += 'CONFIG_NVMM'
  endif
endif

tcg_arch = host_arch
if get_option('tcg').allowed()
  if host_arch == 'unknown'
    if get_option('tcg_interpreter')
      warning('Unsupported CPU @0@, will use TCG with TCI (slow)'.format(cpu))
    else
      error('Unsupported CPU @0@, try --enable-tcg-interpreter'.format(cpu))
    endif
  elif get_option('tcg_interpreter')
    warning('Use of the TCG interpreter is not recommended on this host')
    warning('architecture. There is a native TCG execution backend available')
    warning('which provides substantially better performance and reliability.')
    warning('It is strongly recommended to remove the --enable-tcg-interpreter')
    warning('configuration option on this architecture to use the native')
    warning('backend.')
  endif
  if get_option('tcg_interpreter')
    tcg_arch = 'tci'
  elif host_arch == 'sparc64'
    tcg_arch = 'sparc'
  elif host_arch == 'x86_64'
    tcg_arch = 'i386'
  elif host_arch == 'ppc64'
    tcg_arch = 'ppc'
  endif
  add_project_arguments('-iquote', meson.current_source_dir() / 'tcg' / tcg_arch,
                        language: ['c', 'cpp', 'objc'])

  accelerators += 'CONFIG_TCG'
  config_host += { 'CONFIG_TCG': 'y' }
endif

if 'CONFIG_KVM' not in accelerators and get_option('kvm').enabled()
  error('KVM not available on this platform')
endif
if 'CONFIG_HVF' not in accelerators and get_option('hvf').enabled()
  error('HVF not available on this platform')
endif
if 'CONFIG_NVMM' not in accelerators and get_option('nvmm').enabled()
  error('NVMM not available on this platform')
endif
if 'CONFIG_WHPX' not in accelerators and get_option('whpx').enabled()
  error('WHPX not available on this platform')
endif

################
# Dependencies #
################

# The path to glib.h is added to all compilation commands.  This was
# grandfathered in from the QEMU Makefiles.
add_project_arguments(config_host['GLIB_CFLAGS'].split(),
                      native: false, language: ['c', 'cpp', 'objc'])
glib = declare_dependency(compile_args: config_host['GLIB_CFLAGS'].split(),
                          link_args: config_host['GLIB_LIBS'].split(),
                          version: config_host['GLIB_VERSION'],
                          variables: {
                            'bindir': config_host['GLIB_BINDIR'],
                          })
# override glib dep with the configure results (for subprojects)
meson.override_dependency('glib-2.0', glib)

gio = not_found
gdbus_codegen = not_found
if not get_option('gio').auto() or have_system
  gio = dependency('gio-2.0', required: get_option('gio'),
                   method: 'pkg-config', kwargs: static_kwargs)
  if gio.found() and not cc.links('''
    #include <gio/gio.h>
    int main(void)
    {
      g_dbus_proxy_new_sync(0, 0, 0, 0, 0, 0, 0, 0);
      return 0;
    }''', dependencies: [glib, gio])
    if get_option('gio').enabled()
      error('The installed libgio is broken for static linking')
    endif
    gio = not_found
  endif
  if gio.found()
    gdbus_codegen = find_program(gio.get_variable('gdbus_codegen'),
                                 required: get_option('gio'))
    gio_unix = dependency('gio-unix-2.0', required: get_option('gio'),
                          method: 'pkg-config', kwargs: static_kwargs)
    gio = declare_dependency(dependencies: [gio, gio_unix],
                             version: gio.version())
  endif
endif

lttng = not_found
if 'ust' in get_option('trace_backends')
  lttng = dependency('lttng-ust', required: true, version: '>= 2.1',
                     method: 'pkg-config', kwargs: static_kwargs)
endif
pixman = not_found
if have_system or have_tools
  pixman = dependency('pixman-1', required: have_system, version:'>=0.21.8',
                      method: 'pkg-config', kwargs: static_kwargs)
endif
zlib = dependency('zlib', required: true, kwargs: static_kwargs)

libaio = not_found
if not get_option('linux_aio').auto() or have_block
  libaio = cc.find_library('aio', has_headers: ['libaio.h'],
                           required: get_option('linux_aio'),
                           kwargs: static_kwargs)
endif

linux_io_uring_test = '''
  #include <liburing.h>
  #include <linux/errqueue.h>

  int main(void) { return 0; }'''

linux_io_uring = not_found
if not get_option('linux_io_uring').auto() or have_block
  linux_io_uring = dependency('liburing', version: '>=0.3',
                              required: get_option('linux_io_uring'),
                              method: 'pkg-config', kwargs: static_kwargs)
  if not cc.links(linux_io_uring_test)
    linux_io_uring = not_found
  endif
endif

libnfs = not_found
if not get_option('libnfs').auto() or have_block
  libnfs = dependency('libnfs', version: '>=1.9.3',
                      required: get_option('libnfs'),
                      method: 'pkg-config', kwargs: static_kwargs)
endif

libattr_test = '''
  #include <stddef.h>
  #include <sys/types.h>
  #ifdef CONFIG_LIBATTR
  #include <attr/xattr.h>
  #else
  #include <sys/xattr.h>
  #endif
  int main(void) { getxattr(NULL, NULL, NULL, 0); setxattr(NULL, NULL, NULL, 0, 0); return 0; }'''

libattr = not_found
have_old_libattr = false
if get_option('attr').allowed()
  if cc.links(libattr_test)
    libattr = declare_dependency()
  else
    libattr = cc.find_library('attr', has_headers: ['attr/xattr.h'],
                              required: get_option('attr'),
                              kwargs: static_kwargs)
    if libattr.found() and not \
      cc.links(libattr_test, dependencies: libattr, args: '-DCONFIG_LIBATTR')
      libattr = not_found
      if get_option('attr').enabled()
        error('could not link libattr')
      else
        warning('could not link libattr, disabling')
      endif
    else
      have_old_libattr = libattr.found()
    endif
  endif
endif

cocoa = dependency('appleframeworks', modules: ['Cocoa', 'CoreVideo'],
                   required: get_option('cocoa'))
if cocoa.found() and get_option('sdl').enabled()
  error('Cocoa and SDL cannot be enabled at the same time')
endif
if cocoa.found() and get_option('gtk').enabled()
  error('Cocoa and GTK+ cannot be enabled at the same time')
endif

vmnet = dependency('appleframeworks', modules: 'vmnet', required: get_option('vmnet'))
if vmnet.found() and not cc.has_header_symbol('vmnet/vmnet.h',
                                              'VMNET_BRIDGED_MODE',
                                              dependencies: vmnet)
  vmnet = not_found
  if get_option('vmnet').enabled()
    error('vmnet.framework API is outdated')
  else
    warning('vmnet.framework API is outdated, disabling')
  endif
endif

seccomp = not_found
if not get_option('seccomp').auto() or have_system or have_tools
  seccomp = dependency('libseccomp', version: '>=2.3.0',
                       required: get_option('seccomp'),
                       method: 'pkg-config', kwargs: static_kwargs)
endif

libcap_ng = not_found
if not get_option('cap_ng').auto() or have_system or have_tools
  libcap_ng = cc.find_library('cap-ng', has_headers: ['cap-ng.h'],
                              required: get_option('cap_ng'),
                              kwargs: static_kwargs)
endif
if libcap_ng.found() and not cc.links('''
   #include <cap-ng.h>
   int main(void)
   {
     capng_capability_to_name(CAPNG_EFFECTIVE);
     return 0;
   }''', dependencies: libcap_ng)
  libcap_ng = not_found
  if get_option('cap_ng').enabled()
    error('could not link libcap-ng')
  else
    warning('could not link libcap-ng, disabling')
  endif
endif

if get_option('xkbcommon').auto() and not have_system and not have_tools
  xkbcommon = not_found
else
  xkbcommon = dependency('xkbcommon', required: get_option('xkbcommon'),
                         method: 'pkg-config', kwargs: static_kwargs)
endif

vde = not_found
if not get_option('vde').auto() or have_system or have_tools
  vde = cc.find_library('vdeplug', has_headers: ['libvdeplug.h'],
                           required: get_option('vde'),
                           kwargs: static_kwargs)
endif
if vde.found() and not cc.links('''
   #include <libvdeplug.h>
   int main(void)
   {
     struct vde_open_args a = {0, 0, 0};
     char s[] = "";
     vde_open(s, s, &a);
     return 0;
   }''', dependencies: vde)
  vde = not_found
  if get_option('cap_ng').enabled()
    error('could not link libvdeplug')
  else
    warning('could not link libvdeplug, disabling')
  endif
endif

pulse = not_found
if not get_option('pa').auto() or (targetos == 'linux' and have_system)
  pulse = dependency('libpulse', required: get_option('pa'),
                     method: 'pkg-config', kwargs: static_kwargs)
endif
alsa = not_found
if not get_option('alsa').auto() or (targetos == 'linux' and have_system)
  alsa = dependency('alsa', required: get_option('alsa'),
                    method: 'pkg-config', kwargs: static_kwargs)
endif
jack = not_found
if not get_option('jack').auto() or have_system
  jack = dependency('jack', required: get_option('jack'),
                    method: 'pkg-config', kwargs: static_kwargs)
endif

spice_protocol = not_found
if not get_option('spice_protocol').auto() or have_system
  spice_protocol = dependency('spice-protocol', version: '>=0.12.3',
                              required: get_option('spice_protocol'),
                              method: 'pkg-config', kwargs: static_kwargs)
endif
spice = not_found
if not get_option('spice').auto() or have_system
  spice = dependency('spice-server', version: '>=0.12.5',
                     required: get_option('spice'),
                     method: 'pkg-config', kwargs: static_kwargs)
endif
spice_headers = spice.partial_dependency(compile_args: true, includes: true)

rt = cc.find_library('rt', required: false)

libiscsi = not_found
if not get_option('libiscsi').auto() or have_block
  libiscsi = dependency('libiscsi', version: '>=1.9.0',
                         required: get_option('libiscsi'),
                         method: 'pkg-config', kwargs: static_kwargs)
endif
zstd = not_found
if not get_option('zstd').auto() or have_block
  zstd = dependency('libzstd', version: '>=1.4.0',
                    required: get_option('zstd'),
                    method: 'pkg-config', kwargs: static_kwargs)
endif
virgl = not_found

have_vhost_user_gpu = have_tools and targetos == 'linux' and pixman.found()
if not get_option('virglrenderer').auto() or have_system or have_vhost_user_gpu
  virgl = dependency('virglrenderer',
                     method: 'pkg-config',
                     required: get_option('virglrenderer'),
                     kwargs: static_kwargs)
endif
curl = not_found
if not get_option('curl').auto() or have_block
  curl = dependency('libcurl', version: '>=7.29.0',
                    method: 'pkg-config',
                    required: get_option('curl'),
                    kwargs: static_kwargs)
endif
libudev = not_found
if targetos == 'linux' and (have_system or have_tools)
  libudev = dependency('libudev',
                       method: 'pkg-config',
                       required: get_option('libudev'),
                       kwargs: static_kwargs)
endif

mpathlibs = [libudev]
mpathpersist = not_found
mpathpersist_new_api = false
if targetos == 'linux' and have_tools and get_option('mpath').allowed()
  mpath_test_source_new = '''
    #include <libudev.h>
    #include <mpath_persist.h>
    unsigned mpath_mx_alloc_len = 1024;
    int logsink;
    static struct config *multipath_conf;
    extern struct udev *udev;
    extern struct config *get_multipath_config(void);
    extern void put_multipath_config(struct config *conf);
    struct udev *udev;
    struct config *get_multipath_config(void) { return multipath_conf; }
    void put_multipath_config(struct config *conf) { }
    int main(void) {
        udev = udev_new();
        multipath_conf = mpath_lib_init();
        return 0;
    }'''
  mpath_test_source_old = '''
      #include <libudev.h>
      #include <mpath_persist.h>
      unsigned mpath_mx_alloc_len = 1024;
      int logsink;
      int main(void) {
          struct udev *udev = udev_new();
          mpath_lib_init(udev);
          return 0;
      }'''
  libmpathpersist = cc.find_library('mpathpersist',
                                    required: get_option('mpath'),
                                    kwargs: static_kwargs)
  if libmpathpersist.found()
    mpathlibs += libmpathpersist
    if enable_static
      mpathlibs += cc.find_library('devmapper',
                                     required: get_option('mpath'),
                                     kwargs: static_kwargs)
    endif
    mpathlibs += cc.find_library('multipath',
                                 required: get_option('mpath'),
                                 kwargs: static_kwargs)
    foreach lib: mpathlibs
      if not lib.found()
        mpathlibs = []
        break
      endif
    endforeach
    if mpathlibs.length() == 0
      msg = 'Dependencies missing for libmpathpersist'
    elif cc.links(mpath_test_source_new, dependencies: mpathlibs)
      mpathpersist = declare_dependency(dependencies: mpathlibs)
      mpathpersist_new_api = true
    elif cc.links(mpath_test_source_old, dependencies: mpathlibs)
      mpathpersist = declare_dependency(dependencies: mpathlibs)
    else
      msg = 'Cannot detect libmpathpersist API'
    endif
    if not mpathpersist.found()
      if get_option('mpath').enabled()
        error(msg)
      else
        warning(msg + ', disabling')
      endif
    endif
  endif
endif

iconv = not_found
curses = not_found
if have_system and get_option('curses').allowed()
  curses_test = '''
    #if defined(__APPLE__) || defined(__OpenBSD__)
    #define _XOPEN_SOURCE_EXTENDED 1
    #endif
    #include <locale.h>
    #include <curses.h>
    #include <wchar.h>
    int main(void) {
      wchar_t wch = L'w';
      setlocale(LC_ALL, "");
      resize_term(0, 0);
      addwstr(L"wide chars\n");
      addnwstr(&wch, 1);
      add_wch(WACS_DEGREE);
      return 0;
    }'''

  curses_dep_list = targetos == 'windows' ? ['ncurses', 'ncursesw'] : ['ncursesw']
  foreach curses_dep : curses_dep_list
    if not curses.found()
      curses = dependency(curses_dep,
                          required: false,
                          method: 'pkg-config',
                          kwargs: static_kwargs)
    endif
  endforeach
  msg = get_option('curses').enabled() ? 'curses library not found' : ''
  curses_compile_args = ['-DNCURSES_WIDECHAR=1']
  if curses.found()
    if cc.links(curses_test, args: curses_compile_args, dependencies: [curses])
      curses = declare_dependency(compile_args: curses_compile_args, dependencies: [curses])
    else
      msg = 'curses package not usable'
      curses = not_found
    endif
  endif
  if not curses.found()
    has_curses_h = cc.has_header('curses.h', args: curses_compile_args)
    if targetos != 'windows' and not has_curses_h
      message('Trying with /usr/include/ncursesw')
      curses_compile_args += ['-I/usr/include/ncursesw']
      has_curses_h = cc.has_header('curses.h', args: curses_compile_args)
    endif
    if has_curses_h
      curses_libname_list = (targetos == 'windows' ? ['pdcurses'] : ['ncursesw', 'cursesw'])
      foreach curses_libname : curses_libname_list
        libcurses = cc.find_library(curses_libname,
                                    required: false,
                                    kwargs: static_kwargs)
        if libcurses.found()
          if cc.links(curses_test, args: curses_compile_args, dependencies: libcurses)
            curses = declare_dependency(compile_args: curses_compile_args,
                                        dependencies: [libcurses])
            break
          else
            msg = 'curses library not usable'
          endif
        endif
      endforeach
    endif
  endif
  if get_option('iconv').allowed()
    foreach link_args : [ ['-liconv'], [] ]
      # Programs will be linked with glib and this will bring in libiconv on FreeBSD.
      # We need to use libiconv if available because mixing libiconv's headers with
      # the system libc does not work.
      # However, without adding glib to the dependencies -L/usr/local/lib will not be
      # included in the command line and libiconv will not be found.
      if cc.links('''
        #include <iconv.h>
        int main(void) {
          iconv_t conv = iconv_open("WCHAR_T", "UCS-2");
          return conv != (iconv_t) -1;
        }''', args: config_host['GLIB_CFLAGS'].split() + config_host['GLIB_LIBS'].split() + link_args)
        iconv = declare_dependency(link_args: link_args, dependencies: glib)
        break
      endif
    endforeach
  endif
  if curses.found() and not iconv.found()
    if get_option('iconv').enabled()
      error('iconv not available')
    endif
    msg = 'iconv required for curses UI but not available'
    curses = not_found
  endif
  if not curses.found() and msg != ''
    if get_option('curses').enabled()
      error(msg)
    else
      warning(msg + ', disabling')
    endif
  endif
endif

brlapi = not_found
if not get_option('brlapi').auto() or have_system
  brlapi = cc.find_library('brlapi', has_headers: ['brlapi.h'],
                         required: get_option('brlapi'),
                         kwargs: static_kwargs)
  if brlapi.found() and not cc.links('''
     #include <brlapi.h>
     #include <stddef.h>
     int main(void) { return brlapi__openConnection (NULL, NULL, NULL); }''', dependencies: brlapi)
    brlapi = not_found
    if get_option('brlapi').enabled()
      error('could not link brlapi')
    else
      warning('could not link brlapi, disabling')
    endif
  endif
endif

sdl = not_found
if not get_option('sdl').auto() or (have_system and not cocoa.found())
  sdl = dependency('sdl2', required: get_option('sdl'), kwargs: static_kwargs)
  sdl_image = not_found
endif
if sdl.found()
  # work around 2.0.8 bug
  sdl = declare_dependency(compile_args: '-Wno-undef',
                           dependencies: sdl)
  sdl_image = dependency('SDL2_image', required: get_option('sdl_image'),
                         method: 'pkg-config', kwargs: static_kwargs)
else
  if get_option('sdl_image').enabled()
    error('sdl-image required, but SDL was @0@'.format(
          get_option('sdl').disabled() ? 'disabled' : 'not found'))
  endif
  sdl_image = not_found
endif

rbd = not_found
if not get_option('rbd').auto() or have_block
  librados = cc.find_library('rados', required: get_option('rbd'),
                             kwargs: static_kwargs)
  librbd = cc.find_library('rbd', has_headers: ['rbd/librbd.h'],
                           required: get_option('rbd'),
                           kwargs: static_kwargs)
  if librados.found() and librbd.found()
    if cc.links('''
      #include <stdio.h>
      #include <rbd/librbd.h>
      int main(void) {
        rados_t cluster;
        rados_create(&cluster, NULL);
        #if LIBRBD_VERSION_CODE < LIBRBD_VERSION(1, 12, 0)
        #error
        #endif
        return 0;
      }''', dependencies: [librbd, librados])
      rbd = declare_dependency(dependencies: [librbd, librados])
    elif get_option('rbd').enabled()
      error('librbd >= 1.12.0 required')
    else
      warning('librbd >= 1.12.0 not found, disabling')
    endif
  endif
endif

glusterfs = not_found
glusterfs_ftruncate_has_stat = false
glusterfs_iocb_has_stat = false
if not get_option('glusterfs').auto() or have_block
  glusterfs = dependency('glusterfs-api', version: '>=3',
                         required: get_option('glusterfs'),
                         method: 'pkg-config', kwargs: static_kwargs)
  if glusterfs.found()
    glusterfs_ftruncate_has_stat = cc.links('''
      #include <glusterfs/api/glfs.h>

      int
      main(void)
      {
          /* new glfs_ftruncate() passes two additional args */
          return glfs_ftruncate(NULL, 0, NULL, NULL);
      }
    ''', dependencies: glusterfs)
    glusterfs_iocb_has_stat = cc.links('''
      #include <glusterfs/api/glfs.h>

      /* new glfs_io_cbk() passes two additional glfs_stat structs */
      static void
      glusterfs_iocb(glfs_fd_t *fd, ssize_t ret, struct glfs_stat *prestat, struct glfs_stat *poststat, void *data)
      {}

      int
      main(void)
      {
          glfs_io_cbk iocb = &glusterfs_iocb;
          iocb(NULL, 0 , NULL, NULL, NULL);