Even if jemalloc feature is used do not use it on msvc

Fixes #2233

crates/ra_prof/Cargo.toml

@@ -1,17 +1,19 @@
-[package]
-edition = "2018"
-name = "ra_prof"
-version = "0.1.0"
-authors = ["rust-analyzer developers"]
-publish = false
-
-[dependencies]
-once_cell = "1.0.1"
-itertools = "0.8.0"
-backtrace = "0.3.28"
-jemallocator = { version = "0.3.2", optional = true }
-jemalloc-ctl = { version = "0.3.2", optional = true }
-
-[features]
-jemalloc = [ "jemallocator", "jemalloc-ctl" ]
-cpu_profiler = []
+[package]
+edition = "2018"
+name = "ra_prof"
+version = "0.1.0"
+authors = ["rust-analyzer developers"]
+publish = false
+
+[dependencies]
+once_cell = "1.0.1"
+itertools = "0.8.0"
+backtrace = "0.3.28"
+
+[target.'cfg(not(target_env = "msvc"))'.dependencies]
+jemallocator = { version = "0.3.2", optional = true }
+jemalloc-ctl = { version = "0.3.2", optional = true }
+
+[features]
+jemalloc = [ "jemallocator", "jemalloc-ctl" ]
+cpu_profiler = []

crates/ra_prof/src/lib.rs

@@ -24,7 +24,7 @@ pub use crate::memory_usage::{Bytes, MemoryUsage};
 
 // We use jemalloc mainly to get heap usage statistics, actual performance
 // difference is not measures.
-#[cfg(feature = "jemalloc")]
+#[cfg(all(feature = "jemalloc", not(target_env = "msvc")))]
 #[global_allocator]
 static ALLOC: jemallocator::Jemalloc = jemallocator::Jemalloc;
 

crates/ra_prof/src/memory_usage.rs

@@ -8,7 +8,7 @@ pub struct MemoryUsage {
 }
 
 impl MemoryUsage {
-    #[cfg(feature = "jemalloc")]
+    #[cfg(all(feature = "jemalloc", not(target_env = "msvc")))]
     pub fn current() -> MemoryUsage {
         jemalloc_ctl::epoch::advance().unwrap();
         MemoryUsage {
@@ -17,7 +17,7 @@ impl MemoryUsage {
         }
     }
 
-    #[cfg(not(feature = "jemalloc"))]
+    #[cfg(any(not(feature = "jemalloc"), target_env = "msvc"))]
     pub fn current() -> MemoryUsage {
         MemoryUsage { allocated: Bytes(0), resident: Bytes(0) }
     }