Added mimalloc dev and dev-slice support

- Added support to use the v1 dev branch or v2 dev-slice branch
- Added option to update the git submodules to be able to use the latest commits from upstream mimalloc.

.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"]
+	path = libmimalloc-sys/c_src/mimalloc_dev
+	url = https://github.com/microsoft/mimalloc.git
+	branch = dev
+[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

Cargo.toml

@@ -30,3 +30,11 @@ override = ["libmimalloc-sys/override"]
 debug = ["libmimalloc-sys/debug"]
 debug_in_debug = ["libmimalloc-sys/debug_in_debug"]
 local_dynamic_tls = ["libmimalloc-sys/local_dynamic_tls"]
+
+# Allow to select different mimalloc branch
+v1_dev = ["libmimalloc-sys/v1_dev"] # v1 dev branch
+v2_dev = ["libmimalloc-sys/v2_dev"] # v2 dev-slice branch
+# Trigger git submodule update to have the latest upstream commit to be used
+# This will be for all submodules, master, dev and dev-slice
+# Since mimalloc isn't fully ABI stable at the moment, it could cause issues.
+submodule_update = ["libmimalloc-sys/submodule_update"]

libmimalloc-sys/Cargo.toml

@@ -24,6 +24,14 @@ override = []
 extended = ["cty"]
 local_dynamic_tls = []
 
+# Allow to select different mimalloc branch
+v1_dev = [] # v1 dev branch
+v2_dev = [] # v2 dev-slice branch
+# Trigger git submodule update to have the latest upstream commit to be used
+# This will be for all submodules, master, dev and dev-slice
+# Since mimalloc isn't fully ABI stable at the moment, it could cause issues.
+submodule_update = []
+
 # Show `extended` on docs.rs since it's the full API surface.
 [package.metadata.docs.rs]
 features = ["extended"]

libmimalloc-sys/build.rs

@@ -1,11 +1,38 @@
 use std::env;
+use std::process::Command;
 
 fn main() {
+
+    // Update the submodule's if the `submodule_update` feature is enabled.
+    // This ensures the latests commits are used to build this package.
+    // Since mimalloc isn't fully ABI stable at the moment, it could cause issues.
+    if cfg!(feature = "submodule_update") {
+        // Init or update the submodule with libui if needed
+        Command::new("git")
+            .args(&["version"])
+            .status()
+            .expect("Git does not appear to be installed. Error");
+        Command::new("git")
+            .args(&["submodule", "update", "--init", "--recursive", "--remote"])
+            .status()
+            .expect("Unable to update mimalloc submodule branches. Error");
+    }
+
     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!");