From a4fc6204ce27a4fcce071515ee9e5757818b4af5 Mon Sep 17 00:00:00 2001
From: George Hahn <George.Hahn.VHS@gmail.com>
Date: Sun, 29 May 2022 20:30:02 -0600
Subject: Parallelize alternate fw builds (#66)

---
 make.mk | 26 ++++++++++++++++++++++++++
 1 file changed, 26 insertions(+)

(limited to 'make.mk')

diff --git a/make.mk b/make.mk
index ac5be775..d8e2bf8a 100644
--- a/make.mk
+++ b/make.mk
@@ -9,12 +9,38 @@ endif
 ##############################################################################
 .PHONY: all directory clean size
 
+# OS detection, adapted from https://gist.github.com/sighingnow/deee806603ec9274fd47
+DETECTED_OS :=
+ifeq ($(OS),Windows_NT)
+  DETECTED_OS = WINDOWS
+else
+  UNAME_S := $(shell uname -s)
+  ifeq ($(UNAME_S),Linux)
+    DETECTED_OS = LINUX
+  endif
+  ifeq ($(UNAME_S),Darwin)
+    DETECTED_OS = OSX
+  endif
+endif
+$(if ${VERBOSE},$(info OS detected: $(DETECTED_OS)))
+
 ifeq ($(OS), Windows_NT)
   MKDIR = gmkdir
 else
   MKDIR = mkdir
 endif
 
+ifeq ($(DETECTED_OS), LINUX)
+  MAKEFLAGS += -j `nproc`
+endif
+ifeq ($(DETECTED_OS), OSX)
+  NPROCS = $(shell sysctl hw.ncpu  | grep -o '[0-9]\+')
+  MAKEFLAGS += -j $(NPROCS)
+endif
+ifeq ($(DETECTED_OS), WINDOWS)
+  MAKEFLAGS += -j $(NUMBER_OF_PROCESSORS)
+endif
+
 ifndef EMSCRIPTEN
 CC = arm-none-eabi-gcc
 OBJCOPY = arm-none-eabi-objcopy
-- 
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