Filter out empty feature lists

crates/examples/sel4cp/http-server/helpers/virtio-hal-impl/Cargo.toml

@@ -11,4 +11,4 @@ sel4-bounce-buffer-allocator = { path = "../../../../../sel4-bounce-buffer-alloc
 sel4-externally-shared = { path = "../../../../../sel4-externally-shared" }
 sel4-immediate-sync-once-cell = { path = "../../../../../sel4-immediate-sync-once-cell" }
 sel4-sync = { path = "../../../../../sel4-sync" }
-virtio-drivers = { version = "0.5.0", default-features = false, features = [] }
+virtio-drivers = { version = "0.5.0", default-features = false }

crates/examples/sel4cp/http-server/pds/virtio-blk-driver/Cargo.toml

@@ -16,7 +16,7 @@ sel4-shared-ring-buffer = { path = "../../../../../sel4-shared-ring-buffer" }
 sel4-sync = { path = "../../../../../sel4-sync" }
 sel4cp = { path = "../../../../../sel4cp", default-features = false }
 sel4cp-http-server-example-virtio-hal-impl = { path = "../../helpers/virtio-hal-impl" }
-virtio-drivers = { version = "0.5.0", default-features = false, features = [] }
+virtio-drivers = { version = "0.5.0", default-features = false }
 
 [dependencies.sel4-shared-ring-buffer-block-io-types]
 path = "../../../../../sel4-shared-ring-buffer/block-io/types"

crates/private/support/sel4-simple-task/rpc/Cargo.toml

@@ -9,6 +9,6 @@ license = "BSD-2-Clause"
 postcard = ["dep:serde", "dep:postcard"]
 
 [dependencies]
-postcard = { version = "1.0.2", default-features = false, features = [], optional = true }
+postcard = { version = "1.0.2", default-features = false, optional = true }
 sel4 = { path = "../../../../sel4" }
-serde = { version = "1.0.147", default-features = false, features = [], optional = true }
+serde = { version = "1.0.147", default-features = false, optional = true }

crates/private/support/sel4-simple-task/runtime/Cargo.toml

@@ -16,7 +16,7 @@ default = ["serde_json", "alloc"]
 serde_json = ["dep:serde_json"]
 
 [dependencies]
-postcard = { version = "1.0.2", default-features = false, features = [] }
+postcard = { version = "1.0.2", default-features = false }
 sel4 = { path = "../../../../sel4" }
 sel4-backtrace = { path = "../../../../sel4-backtrace", features = ["unwinding", "postcard"] }
 sel4-backtrace-simple = { path = "../../../../sel4-backtrace/simple" }
@@ -30,5 +30,5 @@ sel4-simple-task-runtime-config-types = { path = "./config/types" }
 sel4-simple-task-runtime-macros = { path = "./macros" }
 sel4-simple-task-threading = { path = "../threading" }
 sel4-sync = { path = "../../../../sel4-sync" }
-serde = { version = "1.0.147", default-features = false, features = [] }
+serde = { version = "1.0.147", default-features = false }
 serde_json = { version = "1.0.87", default-features = false, optional = true }

crates/private/tests/root-task/mbedtls/Cargo.toml

@@ -21,13 +21,11 @@ features = ["no_std_deps", "debug"]
 git = "https://github.com/nspin/rust-mbedtls"
 tag = "keep/6eef662dbf636d1ccf86078143b6854f"
 default-features = false
-features = []
 
 [dependencies.mbedtls-sys-auto]
 git = "https://github.com/nspin/rust-mbedtls"
 tag = "keep/6eef662dbf636d1ccf86078143b6854f"
 default-features = false
-features = []
 
 [dependencies.sel4-newlib]
 path = "../../../../sel4-newlib"

crates/sel4-backtrace/Cargo.toml

@@ -13,9 +13,9 @@ unwinding = ["dep:unwinding"]
 
 [dependencies]
 cfg-if = "1.0.0"
-postcard = { version = "1.0.2", default-features = false, features = [], optional = true }
+postcard = { version = "1.0.2", default-features = false, optional = true }
 sel4-backtrace-types = { path = "./types" }
-serde = { version = "1.0.147", default-features = false, features = [], optional = true }
+serde = { version = "1.0.147", default-features = false, optional = true }
 
 [dependencies.unwinding]
 version = "0.1.6"

crates/sel4-backtrace/types/Cargo.toml

@@ -15,7 +15,7 @@ symbolize = ["addr2line", "fallible-iterator", "alloc"]
 [dependencies]
 cfg-if = "1.0.0"
 fallible-iterator = { version = "0.2.0", default-features = false, optional = true }
-postcard = { version = "1.0.2", default-features = false, features = [], optional = true }
+postcard = { version = "1.0.2", default-features = false, optional = true }
 serde = { version = "1.0.147", default-features = false, features = ["derive"], optional = true }
 
 [dependencies.addr2line]

crates/sel4-kernel-loader/Cargo.toml

@@ -10,7 +10,7 @@ aarch64-cpu = "9.0.0"
 cfg-if = "1.0.0"
 heapless = { version = "0.7.16", features = ["serde"] }
 log = "0.4.17"
-postcard = { version = "1.0.2", default-features = false, features = [] }
+postcard = { version = "1.0.2", default-features = false }
 psci = { version = "0.1.1", default-features = false }
 sel4-config = { path = "../sel4/config" }
 sel4-kernel-loader-payload-types = { path = "./payload-types", features = ["serde"] }

crates/sel4cp/postcard/Cargo.toml

@@ -6,7 +6,7 @@ edition = "2021"
 license = "BSD-2-Clause"
 
 [dependencies]
-postcard = { version = "1.0.2", default-features = false, features = [] }
+postcard = { version = "1.0.2", default-features = false }
 sel4 = { path = "../../sel4" }
 sel4cp = { path = ".." }
-serde = { version = "1.0.147", default-features = false, features = [] }
+serde = { version = "1.0.147", default-features = false }

hacking/nix/scope/generated-cargo-manifests/default.nix

@@ -53,6 +53,9 @@ let
 
   cratePaths = lib.mapAttrs (name: path: { inherit name path; }) cratePathAttrs;
 
+  filterOutEmptyFeatureList = attrs:
+    builtins.removeAttrs attrs (lib.optional (attrs ? features && attrs.features == []) "features");
+
   callCrate = { relativePath }:
 
     newScope rec {
@@ -104,40 +107,40 @@ let
         tag = "keep/6eef662dbf636d1ccf86078143b6854f";
       };
 
-      mbedtlsWith = features: (mbedtlsSource // {
+      mbedtlsWith = features: filterOutEmptyFeatureList (mbedtlsSource // {
         default-features = false;
         features = [ "no_std_deps" ] ++ features;
       });
 
-      mbedtlsSysAutoWith = features: (mbedtlsSource // {
+      mbedtlsSysAutoWith = features: filterOutEmptyFeatureList (mbedtlsSource // {
         default-features = false;
         inherit features;
       });
 
-      mbedtlsPlatformSupportWith = features: (mbedtlsSource // {
+      mbedtlsPlatformSupportWith = features: filterOutEmptyFeatureList (mbedtlsSource // {
         default-features = false;
         inherit features;
       });
 
-      serdeWith = features: {
+      serdeWith = features: filterOutEmptyFeatureList {
         version = versions.serde;
         default-features = false;
         inherit features;
       };
 
-      postcardWith = features: {
+      postcardWith = features: filterOutEmptyFeatureList {
         version = versions.postcard;
         default-features = false;
         inherit features;
       };
 
-      unwindingWith = features: {
+      unwindingWith = features: filterOutEmptyFeatureList {
         version = versions.unwinding;
         default-features = false;
         features = [ "unwinder" "fde-custom" "hide-trace" ] ++ features;
       };
 
-      smoltcpWith = features: {
+      smoltcpWith = features: filterOutEmptyFeatureList {
         version = versions.smoltcp;
         default-features = false;
         features = smoltcpBaseProtosFeatures ++ features;
@@ -170,7 +173,7 @@ let
         "packetmeta-id" "async"
       ];
 
-      virtioDriversWith = features: {
+      virtioDriversWith = features: filterOutEmptyFeatureList {
         version = versions.virtio-drivers;
         default-features = false;
         inherit features;