gen_semantics is an executable, not an input.  Meson 0.57 special cases
the first argument and @INPUT@ is not expanded there.  Fix that by
not including it in the input, only in the command.

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
---
 target/hexagon/meson.build | 6 ++----
 1 file changed, 2 insertions(+), 4 deletions(-)

diff --git a/target/hexagon/meson.build b/target/hexagon/meson.build
index 15318a6fa7..5dd68907b1 100644
--- a/target/hexagon/meson.build
+++ b/target/hexagon/meson.build
@@ -33,8 +33,7 @@ gen_semantics = executable(
 semantics_generated = custom_target(
     'semantics_generated.pyinc',
     output: 'semantics_generated.pyinc',
-    input: gen_semantics,
-    command: ['@INPUT@', '@OUTPUT@'],
+    command: [gen_semantics, '@OUTPUT@'],
 )
 hexagon_ss.add(semantics_generated)
 
@@ -154,8 +153,7 @@ gen_dectree_import = executable(
 iset_py = custom_target(
     'iset.py',
     output: 'iset.py',
-    input: gen_dectree_import,
-    command: ['@INPUT@', '@OUTPUT@'],
+    command: [gen_dectree_import, '@OUTPUT@'],
 )
 hexagon_ss.add(iset_py)
 
-- 
2.30.1