Fixes #404: Use log.rs and a file-per-thread logger instead of the dbg! macro;

lib/module/Cargo.toml

@@ -13,6 +13,7 @@ cranelift-codegen = { path = "../codegen", version = "0.18.1", default-features
 cranelift-entity = { path = "../entity", version = "0.18.1", default-features = false }
 hashmap_core = { version = "0.1.9", optional = true }
 failure = "0.1.1"
+log = { version = "0.4.3", default-features = false, features = ["release_max_level_warn"] }
 
 [features]
 default = ["std"]

lib/module/src/lib.rs

@@ -20,12 +20,13 @@
 #[cfg_attr(test, macro_use)]
 extern crate alloc;
 
-#[macro_use]
 extern crate cranelift_codegen;
 #[macro_use]
 extern crate cranelift_entity;
 #[macro_use]
 extern crate failure;
+#[macro_use]
+extern crate log;
 
 mod backend;
 mod data_context;

lib/module/src/module.rs

@@ -467,7 +467,7 @@ where
     pub fn define_function(&mut self, func: FuncId, ctx: &mut Context) -> ModuleResult<()> {
         let compiled = {
             let code_size = ctx.compile(self.backend.isa()).map_err(|e| {
-                dbg!(
+                info!(
                     "defining function {}: {}",
                     func,
                     ctx.func.display(self.backend.isa())