Makefile: Include a .make.options if present

A file .make.options will be loaded if present. It allows specifyong host
dependent flags without polluting the makefile, or use flags that wont work
on all hosts.
My current one contains:

export CC = clang
export CFLAGS = -march=corei7-avx

Signed-off-by: Michel Pollet <buserror@gmail.com>

diff --git a/Makefile.common b/Makefile.common
index d219b96..a73a059 100644 (file)
--- a/Makefile.common
+++ b/Makefile.common
@@ -26,14 +26,21 @@
 #      You should have received a copy of the GNU General Public License
 #      along with simavr.  If not, see <http://www.gnu.org/licenses/>.
 
+# simavr directory
+SIMAVR         ?= ${shell for p in . .. ../.. ../../..;do test -d $$p/simavr/sim && echo $$p/simavr; done}
+
+# You can override the build settings with local changes in this file
+# for example:
+# export CC=clang
+# export CFLAGS=-march=corei7-avx
+# etc
+-include ${wildcard ${SIMAVR}/../.make.options*}
+
 # get the first character of what the compiler says it is, unless it's 'x86_64' doh
 ARCH           = ${shell $(CC) -dumpmachine | sed -e 's/^x/i/' -e 's/\(.\).*/\1/'}
 
 CFLAGS         += -O2 -Wall
 CFLAGS         += -g
-ifeq ($(ARCH), i)
-CFLAGS         += -msse2
-endif
 
 ifeq (${shell uname}, Darwin)
 # gcc 4.2 from MacOS is really not up to scratch anymore 
@@ -58,15 +65,12 @@ CPPFLAGS    += ${patsubst %,-I%,${subst :, ,${IPATH}}}
 
 AVR_CPPFLAGS= ${CPPFLAGS} -idirafter ${AVR_INC}/include
 
-CC                     ?= gcc
+CC                     ?= clang
 AR                     ?= ar
 RANLIB                 ?= ranlib
 MKDIR          ?= mkdir -p
 INSTALL                ?= install
 SHELL          := ${shell which bash}
-
-# simavr directory
-SIMAVR         ?= ${shell for p in . .. ../.. ../../..;do test -d $$p/simavr/sim && echo $$p/simavr; done}
        
 OBJ            = obj-${shell $(CC) -dumpmachine}
 LIBDIR         = ${shell pwd}/${SIMAVR}/${OBJ}