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[PULL 21/46] meson: Warn when TCI is selected but TCG backend is availab

From: Paolo Bonzini
Subject: [PULL 21/46] meson: Warn when TCI is selected but TCG backend is available
Date: Mon, 8 Feb 2021 19:23:06 +0100

From: Philippe Mathieu-Daudé <philmd@redhat.com>

Some new users get confused with 'TCG' and 'TCI', and enable TCI
support expecting to enable TCG.

Emit a warning when native TCG backend is available on the
host architecture, mentioning this is a suboptimal configuration.

Reviewed-by: Thomas Huth <thuth@redhat.com>
Suggested-by: Daniel Berrangé <berrange@redhat.com>
Signed-off-by: Philippe Mathieu-Daudé <philmd@redhat.com>
Reviewed-by: Daniel P. Berrangé <berrange@redhat.com>
Message-Id: <20210125144530.2837481-5-philmd@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
 meson.build | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/meson.build b/meson.build
index 3a13ba3307..4cc3ebb827 100644
--- a/meson.build
+++ b/meson.build
@@ -231,6 +231,13 @@ if not get_option('tcg').disabled()
       error('Unsupported CPU @0@, try --enable-tcg-interpreter'.format(cpu))
+  elif get_option('tcg_interpreter')
+    warning('Use of the TCG interpretor 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 
+    warning('configuration option on this architecture to use the native')
+    warning('backend.')
   if get_option('tcg_interpreter')
     tcg_arch = 'tci'

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