[PATCH] configure, meson: synchronize defaults for configure and Meson Rust options

[Paolo Bonzini <pbonzini@redhat.com>]

If the defaults for --enable-rust ($rust in configure) and Meson's rust
option are out of sync, incremental builds will pick Meson's default.

This happens because, on an incremental build, configure does not run
Meson, Make does instead.  Meson then gets the command line options
from either coredata.dat (which has everything cached in Python's pickle
format) or cmd_line.txt (slow path when Meson version is upgraded), but
neither knows about the rust option, and the meson_options.txt default
is used.

This will cause have_rust to be true if rustc is available; and the build
to fail because configure did not put a RUST_TARGET_TRIPLE in config-host.mak.

When in the Rust pull request I changed the $rust default from auto
to disabled, I should have made the same change to meson_options.txt;
do it now.

Cc: Manos Pitsidianakis <manos.pitsidianakis@linaro.org>
Reported-by: Peter Maydell <peter.maydell@linaro.org>
Reported-by: Daniel P. Berrangé <berrange@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
---
 configure         | 2 +-
 meson_options.txt | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/configure b/configure
index 3e38a91616a..8a9a4153310 100755
--- a/configure
+++ b/configure
@@ -1987,7 +1987,7 @@ if test "$skip_meson" = no; then
   fi
 
   # QEMU options
-  test "$rust" != "auto" && meson_option_add "-Drust=$rust"
+  test "$rust" != "disabled" && meson_option_add "-Drust=$rust"
   test "$cfi" != false && meson_option_add "-Dcfi=$cfi" "-Db_lto=$cfi"
   test "$docs" != auto && meson_option_add "-Ddocs=$docs"
   test -n "${LIB_FUZZING_ENGINE+xxx}" && meson_option_add "-Dfuzzing_engine=$LIB_FUZZING_ENGINE"
diff --git a/meson_options.txt b/meson_options.txt
index 2211f291b2d..fc6d5526d58 100644
--- a/meson_options.txt
+++ b/meson_options.txt
@@ -372,5 +372,5 @@ option('hexagon_idef_parser', type : 'boolean', value : true,
 option('x86_version', type : 'combo', choices : ['0', '1', '2', '3', '4'], value: '1',
        description: 'tweak required x86_64 architecture version beyond compiler default')
 
-option('rust', type: 'feature', value: 'auto',
+option('rust', type: 'feature', value: 'disabled',
        description: 'Rust support')
-- 
2.46.2