From 69c3c7577e4bb385539a0876b8258adbf9bf695c Mon Sep 17 00:00:00 2001
From: Timothee Cour <timothee.cour2@gmail.com>
Date: Thu, 30 Jan 2020 15:09:50 -0800
Subject: [PATCH] build_all.sh: building csources 5X faster thanks to make -j

---
 build_all.sh | 15 +++++++++++----
 1 file changed, 11 insertions(+), 4 deletions(-)

diff --git a/build_all.sh b/build_all.sh
index e22facc1b22b..73af90429cb0 100644
--- a/build_all.sh
+++ b/build_all.sh
@@ -1,6 +1,7 @@
 #! /bin/sh
 
-# build development version of the compiler; can be rerun safely
+# build development version of the compiler; can be rerun safely.
+# arguments can be passed, eg `--cpu i386`
 
 set -u # error on undefined variables
 set -e # exit on first error
@@ -10,14 +11,20 @@ echo_run(){
   "$@"
 }
 
-[ -d csources ] || echo_run git clone --depth 1 https://github.com/nim-lang/csources.git
+[ -d csources ] || echo_run git clone -q --depth 1 https://github.com/nim-lang/csources.git
 
 nim_csources=bin/nim_csources
 build_nim_csources(){
   ## avoid changing dir in case of failure
   (
-    echo_run cd csources
-    echo_run sh build.sh $@
+    if [[ $# -ne 0 ]]; then
+      # some args were passed (eg: `--cpu i386`), need to call build.sh
+      echo_run cd csources
+      echo_run sh build.sh $@
+    else
+      # no args, use multhreaded (5X faster on 16 cores: 10s instead of 50s)
+      echo_run make -C csources -j
+    fi
   )
   # keep $nim_csources in case needed to investigate bootstrap issues
   # without having to rebuild from csources