Support nvcc's --threads flag

src/compiler/c.rs

@@ -100,6 +100,8 @@ pub struct ParsedArguments {
     pub common_args: Vec<OsString>,
     /// Commandline arguments for the compiler that specify the architecture given
     pub arch_args: Vec<OsString>,
+    /// Commandline arguments for the preprocessor or the compiler that don't affect the computed hash.
+    pub unhashed_args: Vec<OsString>,
     /// Extra files that need to have their contents hashed.
     pub extra_hash_files: Vec<PathBuf>,
     /// Whether or not the `-showIncludes` argument is passed on MSVC
@@ -400,6 +402,7 @@ where
                 compiler.plusplus(),
             )
         };
+
         // A compiler binary may be a symlink to another and so has the same digest, but that means
         // the toolchain will not contain the correct path to invoke the compiler! Add the compiler
         // executable path to try and prevent this

src/compiler/diab.rs

@@ -292,6 +292,7 @@ where
         preprocessor_args,
         common_args,
         arch_args: vec![],
+        unhashed_args: vec![],
         extra_hash_files: vec![],
         msvc_show_includes: false,
         profile_generate: false,
@@ -349,6 +350,7 @@ pub fn generate_compile_commands(
         out_file.into(),
     ];
     arguments.extend(parsed_args.preprocessor_args.clone());
+    arguments.extend(parsed_args.unhashed_args.clone());
     arguments.extend(parsed_args.common_args.clone());
     let command = CompileCommand {
         executable: executable.to_owned(),
@@ -755,6 +757,7 @@ mod test {
             preprocessor_args: vec![],
             common_args: vec![],
             arch_args: vec![],
+            unhashed_args: vec![],
             extra_hash_files: vec![],
             msvc_show_includes: false,
             profile_generate: false,

src/compiler/gcc.rs

@@ -119,6 +119,8 @@ ArgData! { pub
     PreprocessorArgumentFlag,
     PreprocessorArgument(OsString),
     PreprocessorArgumentPath(PathBuf),
+    // Used for arguments that shouldn't affect the computed hash
+    Unhashed(OsString),
     DoCompilation,
     Output(PathBuf),
     NeedDepTarget,
@@ -248,6 +250,7 @@ where
     let mut dep_flag = OsString::from("-MT");
     let mut common_args = vec![];
     let mut arch_args = vec![];
+    let mut unhashed_args = vec![];
     let mut preprocessor_args = vec![];
     let mut dependency_args = vec![];
     let mut extra_hash_files = vec![];
@@ -348,7 +351,8 @@ where
             | Some(PreprocessorArgument(_))
             | Some(PreprocessorArgumentPath(_))
             | Some(PassThrough(_))
-            | Some(PassThroughPath(_)) => {}
+            | Some(PassThroughPath(_))
+            | Some(Unhashed(_)) => {}
             Some(Language(lang)) => {
                 language = match lang.to_string_lossy().as_ref() {
                     "c" => Some(Language::C),
@@ -387,6 +391,7 @@ where
             | Some(PassThroughFlag)
             | Some(PassThrough(_))
             | Some(PassThroughPath(_)) => &mut common_args,
+            Some(Unhashed(_)) => &mut unhashed_args,
             Some(Arch(_)) => &mut arch_args,
             Some(ExtraHashFile(path)) => {
                 extra_hash_files.push(cwd.join(path));
@@ -454,6 +459,7 @@ where
             | Some(PassThrough(_))
             | Some(PassThroughFlag)
             | Some(PassThroughPath(_)) => &mut common_args,
+            Some(Unhashed(_)) => &mut unhashed_args,
             Some(ExtraHashFile(path)) => {
                 extra_hash_files.push(cwd.join(path));
                 &mut common_args
@@ -571,6 +577,7 @@ where
         preprocessor_args,
         common_args,
         arch_args,
+        unhashed_args,
         extra_hash_files,
         msvc_show_includes: false,
         profile_generate,
@@ -725,6 +732,7 @@ pub fn generate_compile_commands(
         out_file.into(),
     ];
     arguments.extend(parsed_args.preprocessor_args.clone());
+    arguments.extend(parsed_args.unhashed_args.clone());
     arguments.extend(parsed_args.common_args.clone());
     arguments.extend(parsed_args.arch_args.clone());
     let command = CompileCommand {
@@ -1787,6 +1795,7 @@ mod test {
             preprocessor_args: vec![],
             common_args: vec![],
             arch_args: vec![],
+            unhashed_args: vec![],
             extra_hash_files: vec![],
             msvc_show_includes: false,
             profile_generate: false,

src/compiler/msvc.rs

@@ -549,6 +549,7 @@ pub fn parse_arguments(
     let mut output_arg = None;
     let mut input_arg = None;
     let mut common_args = vec![];
+    let mut unhashed_args = vec![];
     let mut preprocessor_args = vec![];
     let mut dependency_args = vec![];
     let mut extra_hash_files = vec![];
@@ -706,6 +707,7 @@ pub fn parse_arguments(
                 | Some(PassThroughPath(_))
                 | Some(PedanticFlag)
                 | Some(Standard(_)) => &mut common_args,
+                Some(Unhashed(_)) => &mut unhashed_args,
 
                 Some(ProfileGenerate) => {
                     profile_generate = true;
@@ -822,6 +824,7 @@ pub fn parse_arguments(
         preprocessor_args,
         common_args,
         arch_args: vec![],
+        unhashed_args,
         extra_hash_files,
         msvc_show_includes: show_includes,
         profile_generate,
@@ -1019,6 +1022,7 @@ fn generate_compile_commands(
     ];
     arguments.extend(parsed_args.preprocessor_args.clone());
     arguments.extend(parsed_args.dependency_args.clone());
+    arguments.extend(parsed_args.unhashed_args.clone());
     arguments.extend(parsed_args.common_args.clone());
 
     let command = CompileCommand {
@@ -1624,6 +1628,7 @@ mod test {
             preprocessor_args: vec![],
             common_args: vec![],
             arch_args: vec![],
+            unhashed_args: vec![],
             extra_hash_files: vec![],
             msvc_show_includes: false,
             profile_generate: false,
@@ -1684,6 +1689,7 @@ mod test {
             preprocessor_args: vec![],
             common_args: vec![],
             arch_args: vec![],
+            unhashed_args: vec![],
             extra_hash_files: vec![],
             msvc_show_includes: false,
             profile_generate: false,

src/compiler/nvcc.rs

@@ -197,6 +197,7 @@ counted_array!(pub static ARGS: [ArgInfo<gcc::ArgData>; _] = [
     take_arg!("--ptxas-options", OsString, CanBeSeparated('='), PassThrough),
     take_arg!("--relocatable-device-code", OsString, CanBeSeparated('='), PreprocessorArgument),
     take_arg!("--system-include", PathBuf, CanBeSeparated('='), PreprocessorArgumentPath),
+    take_arg!("--threads", OsString, CanBeSeparated('='), Unhashed),
 
     take_arg!("-Xarchive", OsString, CanBeSeparated('='), PassThrough),
     take_arg!("-Xcompiler", OsString, CanBeSeparated('='), PreprocessorArgument),
@@ -216,6 +217,7 @@ counted_array!(pub static ARGS: [ArgInfo<gcc::ArgData>; _] = [
     flag!("-nohdinitlist", PreprocessorArgumentFlag),
     flag!("-ptx", DoCompilation),
     take_arg!("-rdc", OsString, CanBeSeparated('='), PreprocessorArgument),
+    take_arg!("-t", OsString, CanBeSeparated('='), Unhashed),
     take_arg!("-x", OsString, CanBeSeparated('='), Language),
 ]);
 
@@ -281,6 +283,38 @@ mod test {
         assert!(a.common_args.is_empty());
     }
 
+    #[test]
+    fn test_parse_threads_argument_simple_cu() {
+        let a = parses!(
+            "-t=1",
+            "-t",
+            "2",
+            "--threads=1",
+            "--threads=2",
+            "-c",
+            "foo.cu",
+            "-o",
+            "foo.o"
+        );
+        assert_eq!(Some("foo.cu"), a.input.to_str());
+        assert_eq!(Language::Cuda, a.language);
+        assert_map_contains!(
+            a.outputs,
+            (
+                "obj",
+                ArtifactDescriptor {
+                    path: "foo.o".into(),
+                    optional: false
+                }
+            )
+        );
+        assert!(a.preprocessor_args.is_empty());
+        assert_eq!(
+            ovec!["-t=1", "-t=2", "--threads", "1", "--threads", "2"],
+            a.unhashed_args
+        );
+    }
+
     #[test]
     fn test_parse_arguments_simple_c_as_cu() {
         let a = parses!("-x", "cu", "-c", "foo.c", "-o", "foo.o");

src/compiler/tasking_vx.rs

@@ -273,6 +273,7 @@ where
         preprocessor_args,
         common_args,
         arch_args: vec![],
+        unhashed_args: vec![],
         extra_hash_files: vec![],
         msvc_show_includes: false,
         profile_generate: false,
@@ -364,6 +365,7 @@ fn generate_compile_commands(
         out_file.path.as_os_str().into(),
     ];
     arguments.extend(parsed_args.preprocessor_args.clone());
+    arguments.extend(parsed_args.unhashed_args.clone());
     arguments.extend(parsed_args.common_args.clone());
     let command = CompileCommand {
         executable: executable.to_owned(),
@@ -695,6 +697,7 @@ mod test {
             preprocessor_args: vec![],
             common_args: vec![],
             arch_args: vec![],
+            unhashed_args: vec![],
             extra_hash_files: vec![],
             msvc_show_includes: false,
             profile_generate: false,
@@ -718,4 +721,55 @@ mod test {
         // Ensure that we ran all processes.
         assert_eq!(0, creator.lock().unwrap().children.len());
     }
+
+    #[test]
+    fn test_cuda_threads_included_in_compile_command() {
+        let creator = new_creator();
+        let f = TestFixture::new();
+        let parsed_args = ParsedArguments {
+            input: "foo.cu".into(),
+            language: Language::Cuda,
+            compilation_flag: "-c".into(),
+            depfile: None,
+            outputs: vec![(
+                "obj",
+                ArtifactDescriptor {
+                    path: "foo.o".into(),
+                    optional: false,
+                },
+            )]
+            .into_iter()
+            .collect(),
+            dependency_args: vec![],
+            preprocessor_args: vec![],
+            common_args: vec![],
+            arch_args: vec![],
+            unhashed_args: ovec!["--threads", "2"],
+            extra_hash_files: vec![],
+            msvc_show_includes: false,
+            profile_generate: false,
+            color_mode: ColorMode::Auto,
+            suppress_rewrite_includes_only: false,
+        };
+        let compiler = &f.bins[0];
+        // Compiler invocation.
+        next_command(&creator, Ok(MockChild::new(exit_status(0), "", "")));
+        let mut path_transformer = dist::PathTransformer::default();
+        let (command, _, cacheable) = generate_compile_commands(
+            &mut path_transformer,
+            compiler,
+            &parsed_args,
+            f.tempdir.path(),
+            &[],
+        )
+        .unwrap();
+        assert_eq!(
+            ovec!["-c", "foo.cu", "-o", "foo.o", "--threads", "2"],
+            command.arguments
+        );
+        let _ = command.execute(&creator).wait();
+        assert_eq!(Cacheable::Yes, cacheable);
+        // Ensure that we ran all processes.
+        assert_eq!(0, creator.lock().unwrap().children.len());
+    }
 }