configure: automatically parse command line for meson -D options

Right now meson_options.txt lists about 90 options.  Each option
needs code in configure to parse it and pass the option down to Meson as
a -D command-line argument; in addition the default must be duplicated
between configure and meson_options.txt.  This series tries to remove
the code duplication by generating the case statement for those --enable
and --disable options, as well as the corresponding help text.

About 80% of the options can be handled completely by the new mechanism.
Eight meson options are not of the --enable/--disable kind.  Six more need
to be parsed in configure for various reasons documented in the patch,
but they still have their help automatically generated.

The advantages are:

- less code in configure

- parsing and help is more consistent (for example --enable-blobs was
  not supported)

- options are described entirely in one place, meson_options.txt.
  This make it more attractive to use Meson options instead of
  hand-crafted configure options and config-host.mak

A few options change name: --enable-tcmalloc and --enable-jemalloc
become --enable-malloc={tcmalloc,jemalloc}; --disable-blobs becomes
--disable-install-blobs; --enable-trace-backend becomes
--enable-trace-backends.  However, the old names are allowed
for backwards compatibility.

Message-Id: <20211007130829.632254-19-pbonzini@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

2 files changed, 349 insertions, 0 deletions

diff --git a/scripts/meson-buildoptions.py b/scripts/meson-buildoptions.py
index d48af99aaf..256523c09d 100755
--- a/scripts/meson-buildoptions.py
+++ b/scripts/meson-buildoptions.py
@@ -25,10 +25,71 @@ import textwrap
 import shlex
 import sys
 
+SKIP_OPTIONS = {
+    "audio_drv_list",
+    "default_devices",
+    "docdir",
+    "fuzzing_engine",
+    "qemu_firmwarepath",
+    "qemu_suffix",
+    "sphinx_build",
+    "trace_file",
+}
+
+LINE_WIDTH = 76
+
+
+# Convert the default value of an option to the string used in
+# the help message
+def value_to_help(value):
+    if isinstance(value, list):
+        return ",".join(value)
+    if isinstance(value, bool):
+        return "enabled" if value else "disabled"
+    return str(value)
+
+
+def wrap(left, text, indent):
+    spaces = " " * indent
+    if len(left) >= indent:
+        yield left
+        left = spaces
+    else:
+        left = (left + spaces)[0:indent]
+    yield from textwrap.wrap(
+        text, width=LINE_WIDTH, initial_indent=left, subsequent_indent=spaces
+    )
+
+
 def sh_print(line=""):
     print('  printf "%s\\n"', shlex.quote(line))
 
 
+def help_line(left, opt, indent, long):
+    right = f'{opt["description"]}'
+    if long:
+        value = value_to_help(opt["value"])
+        if value != "auto":
+            right += f" [{value}]"
+    if "choices" in opt and long:
+        choices = "/".join(sorted(opt["choices"]))
+        right += f" (choices: {choices})"
+    for x in wrap("  " + left, right, indent):
+        sh_print(x)
+
+
+# Return whether the option (a dictionary) can be used with
+# arguments.  Booleans can never be used with arguments;
+# combos allow an argument only if they accept other values
+# than "auto", "enabled", and "disabled".
+def allow_arg(opt):
+    if opt["type"] == "boolean":
+        return False
+    if opt["type"] != "combo":
+        return True
+    return not (set(opt["choices"]) <= {"auto", "disabled", "enabled"})
+
+
 def load_options(json):
     json = [
         x
@@ -42,17 +103,48 @@ def load_options(json):
 
 def print_help(options):
     print("meson_options_help() {")
+    for opt in options:
+        key = opt["name"].replace("_", "-")
+        # The first section includes options that have an arguments,
+        # and booleans (i.e., only one of enable/disable makes sense)
+        if opt["type"] == "boolean":
+            left = f"--disable-{key}" if opt["value"] else f"--enable-{key}"
+            help_line(left, opt, 27, False)
+        elif allow_arg(opt):
+            if opt["type"] == "combo" and "enabled" in opt["choices"]:
+                left = f"--enable-{key}[=CHOICE]"
+            else:
+                left = f"--enable-{key}=CHOICE"
+            help_line(left, opt, 27, True)
+
     sh_print()
     sh_print("Optional features, enabled with --enable-FEATURE and")
     sh_print("disabled with --disable-FEATURE, default is enabled if available")
     sh_print("(unless built with --without-default-features):")
     sh_print()
+    for opt in options:
+        key = opt["name"].replace("_", "-")
+        if opt["type"] != "boolean" and not allow_arg(opt):
+            help_line(key, opt, 18, False)
     print("}")
 
 
 def print_parse(options):
     print("_meson_option_parse() {")
     print("  case $1 in")
+    for opt in options:
+        key = opt["name"].replace("_", "-")
+        name = opt["name"]
+        if opt["type"] == "boolean":
+            print(f'    --enable-{key}) printf "%s" -D{name}=true ;;')
+            print(f'    --disable-{key}) printf "%s" -D{name}=false ;;')
+        else:
+            if opt["type"] == "combo" and "enabled" in opt["choices"]:
+                print(f'    --enable-{key}) printf "%s" -D{name}=enabled ;;')
+            if opt["type"] == "combo" and "disabled" in opt["choices"]:
+                print(f'    --disable-{key}) printf "%s" -D{name}=disabled ;;')
+            if allow_arg(opt):
+                print(f'    --enable-{key}=*) quote_sh "-D{name}=$2" ;;')
     print("    *) return 1 ;;")
     print("  esac")
     print("}")
diff --git a/scripts/meson-buildoptions.sh b/scripts/meson-buildoptions.sh
index c8ae205601..c795a13020 100644
--- a/scripts/meson-buildoptions.sh
+++ b/scripts/meson-buildoptions.sh
@@ -1,13 +1,270 @@
 # This file is generated by meson-buildoptions.py, do not edit!
 meson_options_help() {
+  printf "%s\n" '  --enable-capstone[=CHOICE]'
+  printf "%s\n" '                           Whether and how to find the capstone library'
+  printf "%s\n" '                           (choices: auto/disabled/enabled/internal/system)'
+  printf "%s\n" '  --enable-cfi             Control-Flow Integrity (CFI)'
+  printf "%s\n" '  --enable-cfi-debug       Verbose errors in case of CFI violation'
+  printf "%s\n" '  --enable-fdt[=CHOICE]    Whether and how to find the libfdt library'
+  printf "%s\n" '                           (choices: auto/disabled/enabled/internal/system)'
+  printf "%s\n" '  --enable-fuzzing         build fuzzing targets'
+  printf "%s\n" '  --disable-install-blobs  install provided firmware blobs'
+  printf "%s\n" '  --enable-malloc=CHOICE   choose memory allocator to use [system] (choices:'
+  printf "%s\n" '                           jemalloc/system/tcmalloc)'
+  printf "%s\n" '  --enable-slirp[=CHOICE]  Whether and how to find the slirp library'
+  printf "%s\n" '                           (choices: auto/disabled/enabled/internal/system)'
+  printf "%s\n" '  --enable-tcg-interpreter TCG with bytecode interpreter (experimental and'
+  printf "%s\n" '                           slow)'
+  printf "%s\n" '  --enable-trace-backends=CHOICE'
+  printf "%s\n" '                           Set available tracing backends [log] (choices:'
+  printf "%s\n" '                           dtrace/ftrace/log/nop/simple/syslog/ust)'
   printf "%s\n" ''
   printf "%s\n" 'Optional features, enabled with --enable-FEATURE and'
   printf "%s\n" 'disabled with --disable-FEATURE, default is enabled if available'
   printf "%s\n" '(unless built with --without-default-features):'
   printf "%s\n" ''
+  printf "%s\n" '  alsa            ALSA sound support'
+  printf "%s\n" '  attr            attr/xattr support'
+  printf "%s\n" '  auth-pam        PAM access control'
+  printf "%s\n" '  bpf             eBPF support'
+  printf "%s\n" '  brlapi          brlapi character device driver'
+  printf "%s\n" '  bzip2           bzip2 support for DMG images'
+  printf "%s\n" '  cap-ng          cap_ng support'
+  printf "%s\n" '  cocoa           Cocoa user interface (macOS only)'
+  printf "%s\n" '  coreaudio       CoreAudio sound support'
+  printf "%s\n" '  curl            CURL block device driver'
+  printf "%s\n" '  curses          curses UI'
+  printf "%s\n" '  docs            Documentations build support'
+  printf "%s\n" '  dsound          DirectSound sound support'
+  printf "%s\n" '  fuse            FUSE block device export'
+  printf "%s\n" '  fuse-lseek      SEEK_HOLE/SEEK_DATA support for FUSE exports'
+  printf "%s\n" '  gcrypt          libgcrypt cryptography support'
+  printf "%s\n" '  gettext         Localization of the GTK+ user interface'
+  printf "%s\n" '  glusterfs       Glusterfs block device driver'
+  printf "%s\n" '  gnutls          GNUTLS cryptography support'
+  printf "%s\n" '  gtk             GTK+ user interface'
+  printf "%s\n" '  guest-agent-msi Build MSI package for the QEMU Guest Agent'
+  printf "%s\n" '  hax             HAX acceleration support'
+  printf "%s\n" '  hvf             HVF acceleration support'
+  printf "%s\n" '  iconv           Font glyph conversion support'
+  printf "%s\n" '  jack            JACK sound support'
+  printf "%s\n" '  kvm             KVM acceleration support'
+  printf "%s\n" '  libdaxctl       libdaxctl support'
+  printf "%s\n" '  libiscsi        libiscsi userspace initiator'
+  printf "%s\n" '  libnfs          libnfs block device driver'
+  printf "%s\n" '  libpmem         libpmem support'
+  printf "%s\n" '  libudev         Use libudev to enumerate host devices'
+  printf "%s\n" '  libusb          libusb support for USB passthrough'
+  printf "%s\n" '  libxml2         libxml2 support for Parallels image format'
+  printf "%s\n" '  linux-aio       Linux AIO support'
+  printf "%s\n" '  linux-io-uring  Linux io_uring support'
+  printf "%s\n" '  lzfse           lzfse support for DMG images'
+  printf "%s\n" '  lzo             lzo compression support'
+  printf "%s\n" '  malloc-trim     enable libc malloc_trim() for memory optimization'
+  printf "%s\n" '  mpath           Multipath persistent reservation passthrough'
+  printf "%s\n" '  multiprocess    Out of process device emulation support'
+  printf "%s\n" '  netmap          netmap network backend support'
+  printf "%s\n" '  nettle          nettle cryptography support'
+  printf "%s\n" '  nvmm            NVMM acceleration support'
+  printf "%s\n" '  oss             OSS sound support'
+  printf "%s\n" '  pa              PulseAudio sound support'
+  printf "%s\n" '  rbd             Ceph block device driver'
+  printf "%s\n" '  sdl             SDL user interface'
+  printf "%s\n" '  sdl-image       SDL Image support for icons'
+  printf "%s\n" '  seccomp         seccomp support'
+  printf "%s\n" '  smartcard       CA smartcard emulation support'
+  printf "%s\n" '  snappy          snappy compression support'
+  printf "%s\n" '  sparse          sparse checker'
+  printf "%s\n" '  spice           Spice server support'
+  printf "%s\n" '  spice-protocol  Spice protocol support'
+  printf "%s\n" '  tcg             TCG support'
+  printf "%s\n" '  u2f             U2F emulation support'
+  printf "%s\n" '  usb-redir       libusbredir support'
+  printf "%s\n" '  vde             vde network backend support'
+  printf "%s\n" '  vhost-user-blk-server'
+  printf "%s\n" '                  build vhost-user-blk server'
+  printf "%s\n" '  virglrenderer   virgl rendering support'
+  printf "%s\n" '  virtfs          virtio-9p support'
+  printf "%s\n" '  virtiofsd       build virtiofs daemon (virtiofsd)'
+  printf "%s\n" '  vnc             VNC server'
+  printf "%s\n" '  vnc-jpeg        JPEG lossy compression for VNC server'
+  printf "%s\n" '  vnc-png         PNG compression for VNC server'
+  printf "%s\n" '  vnc-sasl        SASL authentication for VNC server'
+  printf "%s\n" '  vte             vte support for the gtk UI'
+  printf "%s\n" '  whpx            WHPX acceleration support'
+  printf "%s\n" '  xen             Xen backend support'
+  printf "%s\n" '  xen-pci-passthrough'
+  printf "%s\n" '                  Xen PCI passthrough support'
+  printf "%s\n" '  xkbcommon       xkbcommon support'
+  printf "%s\n" '  zstd            zstd compression support'
 }
 _meson_option_parse() {
   case $1 in
+    --enable-alsa) printf "%s" -Dalsa=enabled ;;
+    --disable-alsa) printf "%s" -Dalsa=disabled ;;
+    --enable-attr) printf "%s" -Dattr=enabled ;;
+    --disable-attr) printf "%s" -Dattr=disabled ;;
+    --enable-auth-pam) printf "%s" -Dauth_pam=enabled ;;
+    --disable-auth-pam) printf "%s" -Dauth_pam=disabled ;;
+    --enable-bpf) printf "%s" -Dbpf=enabled ;;
+    --disable-bpf) printf "%s" -Dbpf=disabled ;;
+    --enable-brlapi) printf "%s" -Dbrlapi=enabled ;;
+    --disable-brlapi) printf "%s" -Dbrlapi=disabled ;;
+    --enable-bzip2) printf "%s" -Dbzip2=enabled ;;
+    --disable-bzip2) printf "%s" -Dbzip2=disabled ;;
+    --enable-cap-ng) printf "%s" -Dcap_ng=enabled ;;
+    --disable-cap-ng) printf "%s" -Dcap_ng=disabled ;;
+    --enable-capstone) printf "%s" -Dcapstone=enabled ;;
+    --disable-capstone) printf "%s" -Dcapstone=disabled ;;
+    --enable-capstone=*) quote_sh "-Dcapstone=$2" ;;
+    --enable-cfi) printf "%s" -Dcfi=true ;;
+    --disable-cfi) printf "%s" -Dcfi=false ;;
+    --enable-cfi-debug) printf "%s" -Dcfi_debug=true ;;
+    --disable-cfi-debug) printf "%s" -Dcfi_debug=false ;;
+    --enable-cocoa) printf "%s" -Dcocoa=enabled ;;
+    --disable-cocoa) printf "%s" -Dcocoa=disabled ;;
+    --enable-coreaudio) printf "%s" -Dcoreaudio=enabled ;;
+    --disable-coreaudio) printf "%s" -Dcoreaudio=disabled ;;
+    --enable-curl) printf "%s" -Dcurl=enabled ;;
+    --disable-curl) printf "%s" -Dcurl=disabled ;;
+    --enable-curses) printf "%s" -Dcurses=enabled ;;
+    --disable-curses) printf "%s" -Dcurses=disabled ;;
+    --enable-docs) printf "%s" -Ddocs=enabled ;;
+    --disable-docs) printf "%s" -Ddocs=disabled ;;
+    --enable-dsound) printf "%s" -Ddsound=enabled ;;
+    --disable-dsound) printf "%s" -Ddsound=disabled ;;
+    --enable-fdt) printf "%s" -Dfdt=enabled ;;
+    --disable-fdt) printf "%s" -Dfdt=disabled ;;
+    --enable-fdt=*) quote_sh "-Dfdt=$2" ;;
+    --enable-fuse) printf "%s" -Dfuse=enabled ;;
+    --disable-fuse) printf "%s" -Dfuse=disabled ;;
+    --enable-fuse-lseek) printf "%s" -Dfuse_lseek=enabled ;;
+    --disable-fuse-lseek) printf "%s" -Dfuse_lseek=disabled ;;
+    --enable-fuzzing) printf "%s" -Dfuzzing=true ;;
+    --disable-fuzzing) printf "%s" -Dfuzzing=false ;;
+    --enable-gcrypt) printf "%s" -Dgcrypt=enabled ;;
+    --disable-gcrypt) printf "%s" -Dgcrypt=disabled ;;
+    --enable-gettext) printf "%s" -Dgettext=enabled ;;
+    --disable-gettext) printf "%s" -Dgettext=disabled ;;
+    --enable-glusterfs) printf "%s" -Dglusterfs=enabled ;;
+    --disable-glusterfs) printf "%s" -Dglusterfs=disabled ;;
+    --enable-gnutls) printf "%s" -Dgnutls=enabled ;;
+    --disable-gnutls) printf "%s" -Dgnutls=disabled ;;
+    --enable-gtk) printf "%s" -Dgtk=enabled ;;
+    --disable-gtk) printf "%s" -Dgtk=disabled ;;
+    --enable-guest-agent-msi) printf "%s" -Dguest_agent_msi=enabled ;;
+    --disable-guest-agent-msi) printf "%s" -Dguest_agent_msi=disabled ;;
+    --enable-hax) printf "%s" -Dhax=enabled ;;
+    --disable-hax) printf "%s" -Dhax=disabled ;;
+    --enable-hvf) printf "%s" -Dhvf=enabled ;;
+    --disable-hvf) printf "%s" -Dhvf=disabled ;;
+    --enable-iconv) printf "%s" -Diconv=enabled ;;
+    --disable-iconv) printf "%s" -Diconv=disabled ;;
+    --enable-install-blobs) printf "%s" -Dinstall_blobs=true ;;
+    --disable-install-blobs) printf "%s" -Dinstall_blobs=false ;;
+    --enable-jack) printf "%s" -Djack=enabled ;;
+    --disable-jack) printf "%s" -Djack=disabled ;;
+    --enable-kvm) printf "%s" -Dkvm=enabled ;;
+    --disable-kvm) printf "%s" -Dkvm=disabled ;;
+    --enable-libdaxctl) printf "%s" -Dlibdaxctl=enabled ;;
+    --disable-libdaxctl) printf "%s" -Dlibdaxctl=disabled ;;
+    --enable-libiscsi) printf "%s" -Dlibiscsi=enabled ;;
+    --disable-libiscsi) printf "%s" -Dlibiscsi=disabled ;;
+    --enable-libnfs) printf "%s" -Dlibnfs=enabled ;;
+    --disable-libnfs) printf "%s" -Dlibnfs=disabled ;;
+    --enable-libpmem) printf "%s" -Dlibpmem=enabled ;;
+    --disable-libpmem) printf "%s" -Dlibpmem=disabled ;;
+    --enable-libudev) printf "%s" -Dlibudev=enabled ;;
+    --disable-libudev) printf "%s" -Dlibudev=disabled ;;
+    --enable-libusb) printf "%s" -Dlibusb=enabled ;;
+    --disable-libusb) printf "%s" -Dlibusb=disabled ;;
+    --enable-libxml2) printf "%s" -Dlibxml2=enabled ;;
+    --disable-libxml2) printf "%s" -Dlibxml2=disabled ;;
+    --enable-linux-aio) printf "%s" -Dlinux_aio=enabled ;;
+    --disable-linux-aio) printf "%s" -Dlinux_aio=disabled ;;
+    --enable-linux-io-uring) printf "%s" -Dlinux_io_uring=enabled ;;
+    --disable-linux-io-uring) printf "%s" -Dlinux_io_uring=disabled ;;
+    --enable-lzfse) printf "%s" -Dlzfse=enabled ;;
+    --disable-lzfse) printf "%s" -Dlzfse=disabled ;;
+    --enable-lzo) printf "%s" -Dlzo=enabled ;;
+    --disable-lzo) printf "%s" -Dlzo=disabled ;;
+    --enable-malloc=*) quote_sh "-Dmalloc=$2" ;;
+    --enable-malloc-trim) printf "%s" -Dmalloc_trim=enabled ;;
+    --disable-malloc-trim) printf "%s" -Dmalloc_trim=disabled ;;
+    --enable-mpath) printf "%s" -Dmpath=enabled ;;
+    --disable-mpath) printf "%s" -Dmpath=disabled ;;
+    --enable-multiprocess) printf "%s" -Dmultiprocess=enabled ;;
+    --disable-multiprocess) printf "%s" -Dmultiprocess=disabled ;;
+    --enable-netmap) printf "%s" -Dnetmap=enabled ;;
+    --disable-netmap) printf "%s" -Dnetmap=disabled ;;
+    --enable-nettle) printf "%s" -Dnettle=enabled ;;
+    --disable-nettle) printf "%s" -Dnettle=disabled ;;
+    --enable-nvmm) printf "%s" -Dnvmm=enabled ;;
+    --disable-nvmm) printf "%s" -Dnvmm=disabled ;;
+    --enable-oss) printf "%s" -Doss=enabled ;;
+    --disable-oss) printf "%s" -Doss=disabled ;;
+    --enable-pa) printf "%s" -Dpa=enabled ;;
+    --disable-pa) printf "%s" -Dpa=disabled ;;
+    --enable-rbd) printf "%s" -Drbd=enabled ;;
+    --disable-rbd) printf "%s" -Drbd=disabled ;;
+    --enable-sdl) printf "%s" -Dsdl=enabled ;;
+    --disable-sdl) printf "%s" -Dsdl=disabled ;;
+    --enable-sdl-image) printf "%s" -Dsdl_image=enabled ;;
+    --disable-sdl-image) printf "%s" -Dsdl_image=disabled ;;
+    --enable-seccomp) printf "%s" -Dseccomp=enabled ;;
+    --disable-seccomp) printf "%s" -Dseccomp=disabled ;;
+    --enable-slirp) printf "%s" -Dslirp=enabled ;;
+    --disable-slirp) printf "%s" -Dslirp=disabled ;;
+    --enable-slirp=*) quote_sh "-Dslirp=$2" ;;
+    --enable-smartcard) printf "%s" -Dsmartcard=enabled ;;
+    --disable-smartcard) printf "%s" -Dsmartcard=disabled ;;
+    --enable-snappy) printf "%s" -Dsnappy=enabled ;;
+    --disable-snappy) printf "%s" -Dsnappy=disabled ;;
+    --enable-sparse) printf "%s" -Dsparse=enabled ;;
+    --disable-sparse) printf "%s" -Dsparse=disabled ;;
+    --enable-spice) printf "%s" -Dspice=enabled ;;
+    --disable-spice) printf "%s" -Dspice=disabled ;;
+    --enable-spice-protocol) printf "%s" -Dspice_protocol=enabled ;;
+    --disable-spice-protocol) printf "%s" -Dspice_protocol=disabled ;;
+    --enable-tcg) printf "%s" -Dtcg=enabled ;;
+    --disable-tcg) printf "%s" -Dtcg=disabled ;;
+    --enable-tcg-interpreter) printf "%s" -Dtcg_interpreter=true ;;
+    --disable-tcg-interpreter) printf "%s" -Dtcg_interpreter=false ;;
+    --enable-trace-backends=*) quote_sh "-Dtrace_backends=$2" ;;
+    --enable-u2f) printf "%s" -Du2f=enabled ;;
+    --disable-u2f) printf "%s" -Du2f=disabled ;;
+    --enable-usb-redir) printf "%s" -Dusb_redir=enabled ;;
+    --disable-usb-redir) printf "%s" -Dusb_redir=disabled ;;
+    --enable-vde) printf "%s" -Dvde=enabled ;;
+    --disable-vde) printf "%s" -Dvde=disabled ;;
+    --enable-vhost-user-blk-server) printf "%s" -Dvhost_user_blk_server=enabled ;;
+    --disable-vhost-user-blk-server) printf "%s" -Dvhost_user_blk_server=disabled ;;
+    --enable-virglrenderer) printf "%s" -Dvirglrenderer=enabled ;;
+    --disable-virglrenderer) printf "%s" -Dvirglrenderer=disabled ;;
+    --enable-virtfs) printf "%s" -Dvirtfs=enabled ;;
+    --disable-virtfs) printf "%s" -Dvirtfs=disabled ;;
+    --enable-virtiofsd) printf "%s" -Dvirtiofsd=enabled ;;
+    --disable-virtiofsd) printf "%s" -Dvirtiofsd=disabled ;;
+    --enable-vnc) printf "%s" -Dvnc=enabled ;;
+    --disable-vnc) printf "%s" -Dvnc=disabled ;;
+    --enable-vnc-jpeg) printf "%s" -Dvnc_jpeg=enabled ;;
+    --disable-vnc-jpeg) printf "%s" -Dvnc_jpeg=disabled ;;
+    --enable-vnc-png) printf "%s" -Dvnc_png=enabled ;;
+    --disable-vnc-png) printf "%s" -Dvnc_png=disabled ;;
+    --enable-vnc-sasl) printf "%s" -Dvnc_sasl=enabled ;;
+    --disable-vnc-sasl) printf "%s" -Dvnc_sasl=disabled ;;
+    --enable-vte) printf "%s" -Dvte=enabled ;;
+    --disable-vte) printf "%s" -Dvte=disabled ;;
+    --enable-whpx) printf "%s" -Dwhpx=enabled ;;
+    --disable-whpx) printf "%s" -Dwhpx=disabled ;;
+    --enable-xen) printf "%s" -Dxen=enabled ;;
+    --disable-xen) printf "%s" -Dxen=disabled ;;
+    --enable-xen-pci-passthrough) printf "%s" -Dxen_pci_passthrough=enabled ;;
+    --disable-xen-pci-passthrough) printf "%s" -Dxen_pci_passthrough=disabled ;;
+    --enable-xkbcommon) printf "%s" -Dxkbcommon=enabled ;;
+    --disable-xkbcommon) printf "%s" -Dxkbcommon=disabled ;;
+    --enable-zstd) printf "%s" -Dzstd=enabled ;;
+    --disable-zstd) printf "%s" -Dzstd=disabled ;;
     *) return 1 ;;
   esac
 }