Enable flambda by default

Author: bobzhang

jscomp/bench.js

@@ -0,0 +1,20 @@
+//@ts-check
+var cp = require("child_process");
+
+var output = cp.execSync(`ninja -t commands test/ocaml_typedtree_test.cmj`, {
+  encoding: "utf8"
+});
+
+var toDO = output
+  .split("\n")
+  .filter(x => x.trim())
+  .pop()
+  .replace(".exe", ".darwin");
+
+console.log(cp.execSync(`time ${toDO}`, { encoding: "utf8" }));
+
+/*
+  real    0m3.658s
+user    0m3.562s
+sys     0m0.089s
+ */

scripts/buildocaml.js

@@ -63,7 +63,7 @@ function build(config) {
 
     if (config) {
       cp.execSync(
-        "./configure -prefix " +
+        "./configure -flambda -prefix " +
           prefix +
           " -no-ocamlbuild  -no-curses -no-graph -no-pthread -no-debugger && make clean",
         { cwd: ocamlSrcDir, stdio: [0, 1, 2] }

scripts/ninjaFactory.js

@@ -14,7 +14,7 @@ ext = ${config.ext}
 INCL = ${config.INCL}
 flags = -nodynlink -I $INCL -g -w -a ../jscomp/stubs/ext_basic_hash_stubs.c
 rule cc
-    command = $ocamlopt $flags $in -o $out ${config.isWin? '' : '&& strip $out'}
+    command = $ocamlopt -O2 $flags $in -o $out ${config.isWin? '' : '&& strip $out'}
     description = Making $out
 # -inline 1000 makes size too large
 # TODO: make sure it can be bootstrapped, at least is a very good