ninjabackend: fix rust program names with dashes

This substitution matches the behaviour of rustc[1] when inferring
crate name based on file name.

[1]: 4e8fb743cc/compiler/rustc_session/src/output.rs (L88)

mesonbuild/backend/ninjabackend.py

@@ -1709,7 +1709,8 @@ class NinjaBackend(backends.Backend):
             args.extend(rustc.get_linker_always_args())
 
         args += self.generate_basic_compiler_args(target, rustc, False)
-        args += ['--crate-name', target.name]
+        # This matches rustc's default behavior.
+        args += ['--crate-name', target.name.replace('-', '_')]
         depfile = os.path.join(target.subdir, target.name + '.d')
         args += ['--emit', f'dep-info={depfile}', '--emit', 'link']
         args += target.get_extra_args('rust')

test cases/rust/1 basic/meson.build

@@ -1,6 +1,6 @@
 project('rustprog', 'rust')
 
-e = executable('program', 'prog.rs',
+e = executable('rust-program', 'prog.rs',
   rust_args : ['-C', 'lto'], # Just a test
   install : true
 )

test cases/rust/1 basic/subdir/meson.build

@@ -1,2 +1,2 @@
-e = executable('program2', 'prog.rs', install : true)
+e = executable('rust-program2', 'prog.rs', install : true)
 test('rusttest2', e)

test cases/rust/1 basic/test.json

@@ -1,8 +1,8 @@
 {
   "installed": [
-    {"type": "exe", "file": "usr/bin/program"},
-    {"type": "pdb", "file": "usr/bin/program"},
-    {"type": "exe", "file": "usr/bin/program2"},
-    {"type": "pdb", "file": "usr/bin/program2"}
+    {"type": "exe", "file": "usr/bin/rust-program"},
+    {"type": "pdb", "file": "usr/bin/rust-program"},
+    {"type": "exe", "file": "usr/bin/rust-program2"},
+    {"type": "pdb", "file": "usr/bin/rust-program2"}
   ]
 }