+### 3.1 Selecting compiler (default = gcc)
+
+CXXFLAGS += -Wall -Wcast-qual -fno-exceptions -fno-rtti -std=c++11 $(EXTRACXXFLAGS)
+DEPENDFLAGS += -std=c++11
+LDFLAGS += $(EXTRALDFLAGS)
+
+ifeq ($(COMP),)
+ COMP=gcc
+endif
+
+ifeq ($(COMP),gcc)
+ comp=gcc
+ CXX=g++
+ CXXFLAGS += -pedantic -Wextra -Wshadow -m$(bits)
+ ifneq ($(UNAME),Darwin)
+ LDFLAGS += -Wl,--no-as-needed
+ endif
+endif
+
+ifeq ($(COMP),mingw)
+ comp=mingw
+
+ ifeq ($(UNAME),Linux)
+ ifeq ($(bits),64)
+ ifeq ($(shell which x86_64-w64-mingw32-c++-posix),)
+ CXX=x86_64-w64-mingw32-c++
+ else
+ CXX=x86_64-w64-mingw32-c++-posix
+ endif
+ else
+ ifeq ($(shell which i686-w64-mingw32-c++-posix),)
+ CXX=i686-w64-mingw32-c++
+ else
+ CXX=i686-w64-mingw32-c++-posix
+ endif
+ endif
+ else
+ CXX=g++
+ endif
+
+ CXXFLAGS += -Wextra -Wshadow
+ LDFLAGS += -static
+endif
+
+ifeq ($(COMP),icc)
+ comp=icc
+ CXX=icpc
+ CXXFLAGS += -diag-disable 1476,10120 -Wcheck -Wabi -Wdeprecated -strict-ansi
+endif
+
+ifeq ($(COMP),clang)
+ comp=clang
+ CXX=clang++
+ CXXFLAGS += -pedantic -Wextra -Wshadow -m$(bits)
+ LDFLAGS += -m$(bits)
+ ifeq ($(UNAME),Darwin)
+ CXXFLAGS += -stdlib=libc++
+ DEPENDFLAGS += -stdlib=libc++
+ endif
+endif
+
+ifeq ($(comp),icc)
+ profile_prepare = icc-profile-prepare
+ profile_make = icc-profile-make
+ profile_use = icc-profile-use
+ profile_clean = icc-profile-clean
+else
+ profile_prepare = gcc-profile-prepare
+ profile_make = gcc-profile-make
+ profile_use = gcc-profile-use
+ profile_clean = gcc-profile-clean
+endif
+
+ifeq ($(UNAME),Darwin)
+ CXXFLAGS += -arch $(arch) -mmacosx-version-min=10.9
+ LDFLAGS += -arch $(arch) -mmacosx-version-min=10.9
+endif
+
+### Travis CI script uses COMPILER to overwrite CXX
+ifdef COMPILER
+ COMPCXX=$(COMPILER)
+endif
+
+### Allow overwriting CXX from command line
+ifdef COMPCXX
+ CXX=$(COMPCXX)
+endif
+
+### On mingw use Windows threads, otherwise POSIX
+ifneq ($(comp),mingw)
+ # On Android Bionic's C library comes with its own pthread implementation bundled in
+ ifneq ($(arch),armv7)
+ # Haiku has pthreads in its libroot, so only link it in on other platforms
+ ifneq ($(UNAME),Haiku)
+ LDFLAGS += -lpthread
+ endif
+ endif
+endif
+
+### 3.2 Debugging
+ifeq ($(debug),no)
+ CXXFLAGS += -DNDEBUG
+else
+ CXXFLAGS += -g
+endif
+
+### 3.3 Optimization
+ifeq ($(optimize),yes)
+
+ CXXFLAGS += -O3
+
+ ifeq ($(comp),gcc)
+
+ ifeq ($(UNAME),Darwin)
+ ifeq ($(arch),i386)
+ CXXFLAGS += -mdynamic-no-pic
+ endif
+ ifeq ($(arch),x86_64)
+ CXXFLAGS += -mdynamic-no-pic
+ endif
+ endif
+
+ ifeq ($(arch),armv7)
+ CXXFLAGS += -fno-gcse -mthumb -march=armv7-a -mfloat-abi=softfp
+ endif
+ endif
+
+ ifeq ($(comp),icc)
+ ifeq ($(UNAME),Darwin)
+ CXXFLAGS += -mdynamic-no-pic
+ endif
+ endif
+
+ ifeq ($(comp),clang)
+ ifeq ($(UNAME),Darwin)
+ ifeq ($(pext),no)
+ CXXFLAGS += -flto
+ LDFLAGS += $(CXXFLAGS)
+ endif
+ ifeq ($(arch),i386)
+ CXXFLAGS += -mdynamic-no-pic
+ endif
+ ifeq ($(arch),x86_64)
+ CXXFLAGS += -mdynamic-no-pic
+ endif
+ endif
+ endif
+endif
+
+### 3.4 Bits
+ifeq ($(bits),64)
+ CXXFLAGS += -DIS_64BIT
+endif
+
+### 3.5 prefetch
+ifeq ($(prefetch),yes)
+ ifeq ($(sse),yes)
+ CXXFLAGS += -msse
+ DEPENDFLAGS += -msse
+ endif
+else
+ CXXFLAGS += -DNO_PREFETCH
+endif
+
+### 3.6 popcnt
+ifeq ($(popcnt),yes)
+ ifeq ($(comp),icc)
+ CXXFLAGS += -msse3 -DUSE_POPCNT
+ else
+ CXXFLAGS += -msse3 -mpopcnt -DUSE_POPCNT
+ endif
+endif
+
+### 3.7 pext
+ifeq ($(pext),yes)
+ CXXFLAGS += -DUSE_PEXT
+ ifeq ($(comp),$(filter $(comp),gcc clang mingw))
+ CXXFLAGS += -mbmi2
+ endif
+endif
+
+### 3.8 Link Time Optimization, it works since gcc 4.5 but not on mingw under Windows.
+### This is a mix of compile and link time options because the lto link phase
+### needs access to the optimization flags.
+ifeq ($(comp),gcc)
+ ifeq ($(optimize),yes)
+ ifeq ($(debug),no)
+ CXXFLAGS += -flto
+ LDFLAGS += $(CXXFLAGS)
+ endif
+ endif
+endif
+
+ifeq ($(comp),mingw)
+ ifeq ($(UNAME),Linux)
+ ifeq ($(optimize),yes)
+ ifeq ($(debug),no)
+ CXXFLAGS += -flto
+ LDFLAGS += $(CXXFLAGS)
+ endif
+ endif
+ endif
+endif
+
+### 3.9 Android 5 can only run position independent executables. Note that this
+### breaks Android 4.0 and earlier.
+ifeq ($(arch),armv7)
+ CXXFLAGS += -fPIE
+ LDFLAGS += -fPIE -pie
+endif