fix: gcc multilib

.travis.yml

@@ -5,6 +5,10 @@ matrix:
     - os: linux
       compiler: gcc
       script: cd main/source/linux && make
+      packages:
+        - g++-6
+        - g++-6-multilib
+        - gcc-multilib
 
     - os: osx
       compiler: clang

main/source/particles/Makefile

@@ -11,12 +11,18 @@ GLUT_HOME  =/usr/local/contrib/unmoderated
 
 MP = #-mp -DPARTICLE_MP
 
+OS:=$(shell uname)
+
 # Make it real fast on an Origin 2000.
 #LNO =-LNO:opt=1:fusion=2:fission=2:fusion_peeling_limit=2048:cs1=32K:cs2=8M
 COPT = $(MP) -O3 $(LNO)  -fPIC
 
 CFLAGS = $(COPT) $(COMPFLAGS) -I. -I.. -I$(GLUT_HOME)/include -I/usr/include/c++/4.8/ -I../common -I../public -I../pm_shared -I../engine
 
+ifeq ($(OS),Darwin)
+CFLAGS +="-target i386-apple-darwin -DCMAKE_OSX_ARCHITECTURES=i386"
+endif
+
 POBJS =action_api.o actions.o HLRender.o opengl.o system.o
 
 ALL = libparticleMP.a
@@ -31,7 +37,7 @@ all: $(ALL)
 
 libparticleMP.a: $(POBJS)
 	rm -f $@
-	ar clq $@ $(POBJS)
+	$(C++) -dynamiclib -undefined suppress -flat_namespace *.o -o libparticles.dylib
 
 SPDir:
 	(make)