From 43873ef0ff403a6bc0242f8cc8510060127abde3 Mon Sep 17 00:00:00 2001
From: Matthew Cline <zelgadis@sourceforge.net>
Date: Sat, 17 Oct 2009 20:22:24 -0700
Subject: makefile: Automatically optimize for your machine

Setting the makefile variable AUTO_OPT_GCC will give GCC a list of
optimization flags suited for the machine make is run on. It does this
using util/auto-opt.sh.  "-march=native -mtune=native" are always
outputted, which causes GCC to detect the CPU type you use and generate
code for that.  On Linux systems it also looks at the flags line of
/proc/cpuinfo to pick x86 optimization flags.
---
 crawl-ref/source/makefile | 25 ++++++++++++++++++++++---
 1 file changed, 22 insertions(+), 3 deletions(-)

(limited to 'crawl-ref/source/makefile')

diff --git a/crawl-ref/source/makefile b/crawl-ref/source/makefile
index f3bcd0b51b..03557f4a4f 100644
--- a/crawl-ref/source/makefile
+++ b/crawl-ref/source/makefile
@@ -24,16 +24,35 @@ GAME = crawl
 # CFWARN(_L) - Warning flags
 # CFOTHERS(_L) - Anything else
 #
-# These are good optimizations for a Pentium M or better:
-#CFOPTIMIZE := -O2 -march=i686 -mtune=i686 -mmmx -msse -msse2 -mfpmath=sse -funroll-all-loops
+
 # These are really good options for the Intel C++ compiler:
 #CFOPTIMIZE := -O2 -parallel
-CFOPTIMIZE := -O2
+
+# Define this to automatically generate code optimized for your machine
+# (GCC only as of now).
+#
+# NOTE: Don't use this with a release build, since the generated code
+# won't work for all machines.
+ifdef AUTO_OPT_GCC
+
+ifdef CROSSHOST
+error Can not do AUTO_OPT_GCC with CROSSHOST
+endif
+
+ifdef HURRY
+error Can not do AUTO_OPT_GCC with HURRY
+endif
+
+AUTO_OPT_FLAGS := $(shell util/auto-opt.sh)
+endif
+
+CFOPTIMIZE := -O2 $(AUTO_OPT_FLAGS)
 CFOTHERS := -fno-strict-aliasing -pipe
 CFOTHERS_L := -fsigned-char
 CFWARN := -Wall
 MAKEFLAGS := --no-print-directory
 
+
 #
 # The GCC and GXX variables are set later.
 #
-- 
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