configure: document --without-default-{features,devices}

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

diff --git a/configure b/configure
index ef96acdc0a33eafc6996f40d037d13f7aa9d61e4..8ef0874ed502dae02888e89266b4ba09ee93da37 100755 (executable)
--- a/configure
+++ b/configure
@@ -1719,6 +1719,10 @@ Advanced options (experts only):
   --efi-aarch64=PATH       PATH of efi file to use for aarch64 VMs.
   --with-suffix=SUFFIX     suffix for QEMU data inside datadir/libdir/sysconfdir/docdir [$qemu_suffix]
   --with-pkgversion=VERS   use specified string as sub-version of the package
+  --without-default-features default all --enable-* options to "disabled"
+  --without-default-devices  do not include any device that is not needed to
+                           start the emulator (only use if you are including
+                           desired devices in default-configs/devices/)
   --enable-debug           enable common debug build options
   --enable-sanitizers      enable default sanitizers
   --enable-tsan            enable thread sanitizer