rust: Support executable name differing from source name

mesonbuild/backend/ninjabackend.py

@@ -1089,9 +1089,9 @@ int dummy;
             raise InvalidArguments('Unknown target type for rustc.')
         args.append(cratetype)
         args += rustc.get_buildtype_args(self.environment.coredata.get_builtin_option('buildtype'))
-        depfile = target.name + '.d'
-        args += ['--out-dir', target.subdir]
-        args += ['--emit', 'dep-info', '--emit', 'link']
+        depfile = os.path.join(target.subdir, target.name + '.d')
+        args += ['--emit', 'dep-info={}'.format(depfile), '--emit', 'link']
+        args += ['-o', os.path.join(target.subdir, target.get_filename())]
         orderdeps = [os.path.join(t.subdir, t.get_filename()) for t in target.link_targets]
         linkdirs = OrderedDict()
         for d in target.link_targets:

mesonbuild/build.py

@@ -479,14 +479,6 @@ class BuildTarget(Target):
                 # CSharp and Java targets can't contain any other file types
                 assert(len(self.compilers) == 1)
                 return
-        if 'rust' in self.compilers:
-            firstname = self.sources[0]
-            if isinstance(firstname, File):
-                firstname = firstname.fname
-            first = os.path.split(firstname)[1]
-            (base, suffix) = os.path.splitext(first)
-            if suffix != '.rs' or self.name != base:
-                raise InvalidArguments('In Rust targets, the first source file must be named projectname.rs.')
 
     def get_original_kwargs(self):
         return self.kwargs

test cases/rust/1 basic/installed_files.txt

@@ -1 +1,2 @@
-usr/bin/prog?exe
+usr/bin/program?exe
+usr/bin/program2?exe

test cases/rust/1 basic/meson.build

@@ -1,4 +1,6 @@
 project('rustprog', 'rust')
 
-e = executable('prog', 'prog.rs', install : true)
+e = executable('program', 'prog.rs', install : true)
 test('rusttest', e)
+
+subdir('subdir')

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

@@ -0,0 +1,2 @@
+e = executable('program2', 'prog.rs', install : true)
+test('rusttest2', e)

test cases/rust/1 basic/subdir/prog.rs

@@ -0,0 +1,3 @@
+fn main() {
+    println!("rust compiler is working");
+}