Propagate `parallel_compiler` feature through rustc crates. Turned off feature gives change of builded crates: 238 -> 224.

7 files changed, 25 insertions, 9 deletions

diff --git a/compiler/rustc/Cargo.toml b/compiler/rustc/Cargo.toml
index 696c003a587..b642e891956 100644
--- a/compiler/rustc/Cargo.toml
+++ b/compiler/rustc/Cargo.toml
@@ -19,3 +19,4 @@ features = ['unprefixed_malloc_on_supported_platforms']
 jemalloc = ['tikv-jemalloc-sys']
 llvm = ['rustc_driver/llvm']
 max_level_info = ['rustc_driver/max_level_info']
+rustc_use_parallel_compiler = ['rustc_driver/rustc_use_parallel_compiler']
diff --git a/compiler/rustc_data_structures/Cargo.toml b/compiler/rustc_data_structures/Cargo.toml
index b82e9717261..7cc8b5c2033 100644
--- a/compiler/rustc_data_structures/Cargo.toml
+++ b/compiler/rustc_data_structures/Cargo.toml
@@ -9,7 +9,7 @@ doctest = false
 [dependencies]
 arrayvec = { version = "0.7", default-features = false }
 ena = "0.14"
-indexmap = { version = "1.8.0", features = ["rustc-rayon"] }
+indexmap = { version = "1.8.0" }
 tracing = "0.1"
 jobserver_crate = { version = "0.1.13", package = "jobserver" }
 rustc_serialize = { path = "../rustc_serialize" }
@@ -17,8 +17,8 @@ rustc_macros = { path = "../rustc_macros" }
 rustc_graphviz = { path = "../rustc_graphviz" }
 cfg-if = "0.1.2"
 stable_deref_trait = "1.0.0"
-rayon = { version = "0.3.2", package = "rustc-rayon" }
-rayon-core = { version = "0.3.2", package = "rustc-rayon-core" }
+rayon = { version = "0.3.2", package = "rustc-rayon", optional = true }
+rayon-core = { version = "0.3.2", package = "rustc-rayon-core", optional = true }
 rustc-hash = "1.1.0"
 smallvec = { version = "1.6.1", features = ["const_generics", "union", "may_dangle"] }
 rustc_index = { path = "../rustc_index", package = "rustc_index" }
@@ -36,3 +36,6 @@ winapi = { version = "0.3", features = ["fileapi", "psapi", "winerror"] }
 
 [target.'cfg(not(target_arch = "wasm32"))'.dependencies]
 memmap2 = "0.2.1"
+
+[features]
+rustc_use_parallel_compiler = ["indexmap/rustc-rayon", "rayon", "rayon-core"]
diff --git a/compiler/rustc_driver/Cargo.toml b/compiler/rustc_driver/Cargo.toml
index 872f946bf7d..fd2ca5beade 100644
--- a/compiler/rustc_driver/Cargo.toml
+++ b/compiler/rustc_driver/Cargo.toml
@@ -39,3 +39,5 @@ winapi = { version = "0.3", features = ["consoleapi", "debugapi", "processenv"]
 [features]
 llvm = ['rustc_interface/llvm']
 max_level_info = ['rustc_log/max_level_info']
+rustc_use_parallel_compiler = ['rustc_data_structures/rustc_use_parallel_compiler', 'rustc_interface/rustc_use_parallel_compiler',
+    'rustc_middle/rustc_use_parallel_compiler']
diff --git a/compiler/rustc_interface/Cargo.toml b/compiler/rustc_interface/Cargo.toml
index e31119c1292..29d1cd0e054 100644
--- a/compiler/rustc_interface/Cargo.toml
+++ b/compiler/rustc_interface/Cargo.toml
@@ -10,8 +10,8 @@ doctest = false
 libc = "0.2"
 libloading = "0.7.1"
 tracing = "0.1"
-rustc-rayon-core = "0.3.2"
-rayon = { version = "0.3.2", package = "rustc-rayon" }
+rustc-rayon-core = { version = "0.3.2", optional = true }
+rayon = { version = "0.3.2", package = "rustc-rayon", optional = true }
 smallvec = { version = "1.6.1", features = ["union", "may_dangle"] }
 rustc_ast = { path = "../rustc_ast" }
 rustc_attr = { path = "../rustc_attr" }
@@ -57,3 +57,4 @@ rustc_target = { path = "../rustc_target" }
 
 [features]
 llvm = ['rustc_codegen_llvm']
+rustc_use_parallel_compiler = ['rayon', 'rustc-rayon-core', 'rustc_query_impl/rustc_use_parallel_compiler']
diff --git a/compiler/rustc_middle/Cargo.toml b/compiler/rustc_middle/Cargo.toml
index 9cfc5f5b444..cd281ea5b38 100644
--- a/compiler/rustc_middle/Cargo.toml
+++ b/compiler/rustc_middle/Cargo.toml
@@ -12,8 +12,8 @@ bitflags = "1.2.1"
 either = "1.5.0"
 gsgdt = "0.1.2"
 tracing = "0.1"
-rustc-rayon = "0.3.2"
-rustc-rayon-core = "0.3.2"
+rustc-rayon = { version = "0.3.2", optional = true }
+rustc-rayon-core = { version = "0.3.2", optional = true }
 polonius-engine = "0.13.0"
 rustc_apfloat = { path = "../rustc_apfloat" }
 rustc_attr = { path = "../rustc_attr" }
@@ -35,3 +35,6 @@ rustc_session = { path = "../rustc_session" }
 rustc_type_ir = { path = "../rustc_type_ir" }
 rand = "0.8.4"
 rand_xoshiro = "0.6.0"
+
+[features]
+rustc_use_parallel_compiler = ["rustc-rayon", "rustc-rayon-core"]
diff --git a/compiler/rustc_query_impl/Cargo.toml b/compiler/rustc_query_impl/Cargo.toml
index f1899a6fb2b..b7502c4b1e2 100644
--- a/compiler/rustc_query_impl/Cargo.toml
+++ b/compiler/rustc_query_impl/Cargo.toml
@@ -8,7 +8,7 @@ doctest = false
 
 [dependencies]
 measureme = "10.0.0"
-rustc-rayon-core = "0.3.2"
+rustc-rayon-core = { version = "0.3.2", optional = true }
 rustc_ast = { path = "../rustc_ast" }
 rustc_data_structures = { path = "../rustc_data_structures" }
 rustc_errors = { path = "../rustc_errors" }
@@ -20,3 +20,6 @@ rustc_query_system = { path = "../rustc_query_system" }
 rustc_serialize = { path = "../rustc_serialize" }
 rustc_session = { path = "../rustc_session" }
 rustc_span = { path = "../rustc_span" }
+
+[features]
+rustc_use_parallel_compiler = ["rustc-rayon-core", "rustc_query_system/rustc_use_parallel_compiler"]
diff --git a/compiler/rustc_query_system/Cargo.toml b/compiler/rustc_query_system/Cargo.toml
index 79f791eb754..8a35121f90c 100644
--- a/compiler/rustc_query_system/Cargo.toml
+++ b/compiler/rustc_query_system/Cargo.toml
@@ -9,7 +9,7 @@ doctest = false
 [dependencies]
 rustc_arena = { path = "../rustc_arena" }
 tracing = "0.1"
-rustc-rayon-core = "0.3.2"
+rustc-rayon-core = { version = "0.3.2", optional = true }
 rustc_ast = { path = "../rustc_ast" }
 rustc_data_structures = { path = "../rustc_data_structures" }
 rustc_errors = { path = "../rustc_errors" }
@@ -23,3 +23,6 @@ rustc_span = { path = "../rustc_span" }
 rustc_target = { path = "../rustc_target" }
 parking_lot = "0.11"
 smallvec = { version = "1.6.1", features = ["union", "may_dangle"] }
+
+[features]
+rustc_use_parallel_compiler = ["rustc-rayon-core"]