# Figure out which architecture we're on
# This is necessary because the x84_64 architecture requires position-indep code (-fPIC)
ARCH := $(shell arch)
OS   := $(shell uname -s)
# Get major version for Darwin; necessary because different version use different 
# xlf config files
ifeq ($(OS),Darwin)
OS_VERSION = $(shell uname -r)
DARWIN_MAJOR_VERSION = $(word 1, $(subst ., ,$(OS_VERSION)))
endif

# C compiler is alway GCC
CC            := gcc
CCFLAGS       := -I$(PYTHONINC) -I$(NUMPYINC)  -I$(CLIMT_SRC_DIR)/f2py \
		  -Wall -Wstrict-prototypes
ifeq ($(ARCH),x86_64)
CCFLAGS       := $(CCFLAGS) -fPIC
endif

# Intel Fortran compiler:
ifeq ($(FCOMPILER),Intel)
FC            := ifort
F90           := ifort
FFLAGS_SHARED := -r8 -132 -w95 -mp -O3
ifeq ($(OS),Darwin)
	LDFLAGS  := -i-static -nofor_main -bundle -flat_namespace \
			-undefined suppress
else
	LDFLAGS  := -shared 
	ifeq ($(ARCH),x86_64)
		FFLAGS_SHARED := $(FFLAGS_SHARED) -fPIC
	else
		LDFLAGS       := $(LDFLAGS) -Bstatic
	endif
endif
FCFLAGS       := $(FFLAGS_SHARED) 
F90FLAGS      := $(FFLAGS_SHARED) 
endif

# Portland Group Fortran compiler:
ifeq ($(FCOMPILER),PGI)
FC            := pgf90
F90           := pgf90
FFLAGS_SHARED := -Mr8 -Mextend -Mnosecond_underscore -Mrecursive -Mdalign -mp -O3
LDFLAGS       := -Mnomain -shared 
ifeq ($(ARCH),x86_64)
FFLAGS_SHARED := $(FFLAGS_SHARED) -fPIC
else
LDFLAGS       := $(LDFLAGS) -Bstatic
endif
FCFLAGS       := $(FFLAGS_SHARED) 
F90FLAGS      := $(FFLAGS_SHARED) 
endif

# IBM XLF Fortran compiler:
ifeq ($(FCOMPILER),IBM)
FC            := xlf
F90           := xlf90
FFLAGS_SHARED := -qautodbl=dbl4 -qextname -qthreaded -qtune=auto \
                 -qarch=auto -qsuppress=cmpmsg -qunroll=auto -O3
FCFLAGS       := $(FFLAGS_SHARED) -qsuffix=f=f:cpp=F -qfixed=132 
F90FLAGS      := $(FFLAGS_SHARED) -qsuffix=f=f90:cpp=F90 -qfree=f90 
LDFLAGS       := -Wl,-bundle,-flat_namespace,-undefined,suppress \
                 -F$(CLIMT_SRC_DIR)/xlf_$(DARWIN_MAJOR_VERSION).cfg
endif

# GNU Fortran90 compiler
ifeq ($(FCOMPILER),GNU)
FC            := gfortran
F90           := gfortran
FFLAGS_SHARED := -Wall -fdefault-real-8 -fno-second-underscore -ffixed-line-length-132
FCFLAGS       := $(FFLAGS_SHARED) 
F90FLAGS      := $(FFLAGS_SHARED) 
ifeq ($(OS),Darwin)
    LDFLAGS       := -bundle -flat_namespace -undefined suppress
else
    LDFLAGS       := -shared
endif

endif