fix Makefile flags

Makefile

@@ -63,10 +63,10 @@ tests/test_blas: tests/test_blas.cpp
 	$(CXX) $(CXXFLAGS) $< -o $@ $(LDFLAGS) $(BLASLDFLAGS) $(BLASCFLAGS)
 
 demos/demo_ivfpq_indexing: demos/demo_ivfpq_indexing.cpp $(LIBNAME).a
-	$(CXX) -o $@ $(CFLAGS) $< $(LIBNAME).a $(LDFLAGS) $(BLASLDFLAGS)
+	$(CXX) -o $@ $(CXXFLAGS) $< $(LIBNAME).a $(LDFLAGS) $(BLASLDFLAGS)
 
 demos/demo_sift1M: demos/demo_sift1M.cpp $(LIBNAME).a
-	$(CXX) -o $@ $(CFLAGS) $< $(LIBNAME).a $(LDFLAGS) $(BLASLDFLAGS)
+	$(CXX) -o $@ $(CXXFLAGS) $< $(LIBNAME).a $(LDFLAGS) $(BLASLDFLAGS)
 
 
 #############################

example_makefiles/makefile.inc.Linux

@@ -125,8 +125,6 @@ PYTHONCFLAGS=-I/usr/include/python2.7/ -I/usr/lib64/python2.7/site-packages/nump
 ###########################################################################
 
 
-# a C++ compiler that supports c++11
-CXX11=g++
 
 # root of the cuda 8 installation
 CUDAROOT=/usr/local/cuda-8.0/
@@ -143,7 +141,7 @@ NVCCFLAGS= $(CUDAFLAGS) \
    -gencode arch=compute_52,code="compute_52" \
    -gencode arch=compute_60,code="compute_60" \
    --std c++11 -lineinfo \
-   -ccbin $(CXX11) -DFAISS_USE_FLOAT16
+   -ccbin $(CXX) -DFAISS_USE_FLOAT16
 
 # BLAS LD flags for nvcc (used to generate an executable)
 # if BLASLDFLAGS contains several flags, each one may

example_makefiles/makefile.inc.Mac.brew

@@ -3,7 +3,7 @@
 
 # Tested on macOS Sierra (10.12.2) with llvm installed using Homebrew (https://brew.sh)
 # brew install llvm
-CC=/usr/local/opt/llvm/bin/clang++
+CXX=/usr/local/opt/llvm/bin/clang++
 CFLAGS=-fPIC -m64 -Wall -g -O3 -msse4 -mpopcnt -fopenmp -Wno-sign-compare -I/usr/local/opt/llvm/include
 CXXFLAGS=$(CFLAGS) -std=c++11
 LLVM_VERSION_PATH=$(shell ls -rt /usr/local/Cellar/llvm/ | tail -n1)

example_makefiles/makefile.inc.Mac.port

@@ -7,7 +7,7 @@
 # The system default clang does not support openmp
 # You can install an openmp compatible g++ with macports:
 # port install g++-mp-6
-CC=/opt/local/bin/g++-mp-6
+CXX=/opt/local/bin/g++-mp-6
 
 CFLAGS=-fPIC -m64 -Wall -g -O3  -msse4 -mpopcnt -fopenmp -Wno-sign-compare
 CXXFLAGS=$(CFLAGS) -std=c++11

gpu/Makefile

@@ -74,7 +74,7 @@ CUOBJ=      impl/BroadcastSum.o \
 
 
 .cpp.o:
-	$(CXX11) $(CXXFLAGS) -fPIC -m64 -Wall -g -Wno-sign-compare -O3 -fopenmp \
+	$(CXX) $(CXXFLAGS) -fPIC -m64 -Wall -g -Wno-sign-compare -O3 -fopenmp \
          -c $< -o $@ $(EXTRAFLAGS) $(CUDACFLAGS)
 
 .cu.o:
@@ -86,7 +86,7 @@ $(LIBNAME).a: $(CPPOBJ) $(CUOBJ)
 	ar r $@ $^
 
 $(LIBNAME).$(SHAREDEXT): $(CPPOBJ) $(CUOBJ)
-	$(CC) -L$(CUDAROOT)/lib64 -lcublas -lcudart $(LDFLAGS) \
+	$(CXX) -L$(CUDAROOT)/lib64 -lcublas -lcudart $(LDFLAGS) \
 	$(FAISSSHAREDFLAGS) -o $(LIBNAME).$(SHAREDEXT) $^