Updated code to support mimalloc v2.

Basic stuff used from this PR purpleprotocol#66

Author: BlackDex

.gitmodules

@@ -1,3 +1,11 @@
 [submodule "libmimalloc-sys/c_src/mimalloc"]
 	path = libmimalloc-sys/c_src/mimalloc
 	url = https://github.com/microsoft/mimalloc
+[submodule "libmimalloc-sys/c_src/mimalloc_dev_slice"]
+	path = libmimalloc-sys/c_src/mimalloc_dev_slice
+	url = https://github.com/microsoft/mimalloc.git
+	branch = dev-slice
+[submodule "libmimalloc-sys/c_src/mimalloc_dev"]
+	path = libmimalloc-sys/c_src/mimalloc_dev
+	url = https://github.com/microsoft/mimalloc.git
+	branch = dev

Cargo.toml

@@ -24,8 +24,11 @@ travis-ci = { repository = "purpleprotocol/mimalloc_rust" }
 libmimalloc-sys = { path = "libmimalloc-sys", version = "0.1.23", default-features = false }
 
 [features]
-default = ["secure"]
+default = ["secure","v1_stable"]
 secure = ["libmimalloc-sys/secure"]
 override = ["libmimalloc-sys/override"]
 debug = ["libmimalloc-sys/debug"]
 local_dynamic_tls = ["libmimalloc-sys/local_dynamic_tls"]
+v1_stable = ["libmimalloc-sys/v1_stable"]
+v1_dev = ["libmimalloc-sys/v1_dev"]
+v2_dev = ["libmimalloc-sys/v2_dev"]

libmimalloc-sys/Cargo.toml

@@ -22,6 +22,9 @@ debug = []
 override = []
 extended = ["cty"]
 local_dynamic_tls = []
+v1_stable = []
+v1_dev = []
+v2_dev = []
 
 # Show `extended` on docs.rs since it's the full API surface.
 [package.metadata.docs.rs]

libmimalloc-sys/build.rs

@@ -3,9 +3,19 @@ use std::env;
 fn main() {
     let mut build = cc::Build::new();
 
-    build.include("c_src/mimalloc/include");
-    build.include("c_src/mimalloc/src");
-    build.file("c_src/mimalloc/src/static.c");
+    if cfg!(feature = "v1_dev") {
+        build.include("c_src/mimalloc_dev/include");
+        build.include("c_src/mimalloc_dev/src");
+        build.file("c_src/mimalloc_dev/src/static.c");
+    } else if cfg!(feature = "v2_dev") {
+        build.include("c_src/mimalloc_dev_slice/include");
+        build.include("c_src/mimalloc_dev_slice/src");
+        build.file("c_src/mimalloc_dev_slice/src/static.c");
+    } else {
+        build.include("c_src/mimalloc/include");
+        build.include("c_src/mimalloc/src");
+        build.file("c_src/mimalloc/src/static.c");
+    }
 
     let target_os = env::var("CARGO_CFG_TARGET_OS").expect("target_os not defined!");
     let target_family = env::var("CARGO_CFG_TARGET_FAMILY").expect("target_family not defined!");