Merge pull request purpleprotocol#72 from EmbarkStudios/expose-debug-feature

Expose mimalloc's debug mode with a "debug" cargo feature

Author: octavonce

Cargo.toml

@@ -27,4 +27,5 @@ libmimalloc-sys = { path = "libmimalloc-sys", version = "0.1.22", default-featur
 default = ["secure"]
 secure = ["libmimalloc-sys/secure"]
 override = ["libmimalloc-sys/override"]
+debug = ["libmimalloc-sys/debug"]
 local_dynamic_tls = ["libmimalloc-sys/local_dynamic_tls"]

libmimalloc-sys/Cargo.toml

@@ -18,6 +18,7 @@ cc = "1.0"
 
 [features]
 secure = []
+debug = []
 override = []
 extended = ["cty"]
 local_dynamic_tls = []

libmimalloc-sys/build.rs

@@ -32,8 +32,13 @@ fn main() {
         }
     }
 
-    // Remove heavy debug assertions etc
-    build.define("MI_DEBUG", "0");
+    if env::var_os("CARGO_FEATURE_DEBUG").is_some() {
+        build.define("MI_DEBUG", "3");
+        build.define("MI_SHOW_ERRORS", "1");
+    } else {
+        // Remove heavy debug assertions etc
+        build.define("MI_DEBUG", "0");
+    }
 
     if build.get_compiler().is_like_msvc() {
         build.cpp(true);