AMReX make configuration for using homebrew-installed gcc

Make.local

#
# AMReX Make configuration for Homebrew
#
# If it exists, the Make.local file is included at the end of Make.defs.  Thus
# one can override various variables here.
#
# Do not check this file into git repo.  This is supposed to be purely local.
#


#
#   Wrappers for C++, C and Fortran compilers.
#

# NOTE: Homebrew installs newer versions for gcc with major version number in
# the compilre exec name (to prevent name collisions)

CXX = g++-9
CC  = gcc-9
FC  = gfortran-9
F90 = gfortran-9


# If you want to use the mpi compiler wrappers instead -- NOTE: this migh use
# apple clang (and not Homebrew installed llvm) which never causes problems
# because apple never breaks any standards *sarcasm*

#CXX := mpicxx
#CC  := mpicc
#FC  := mpif90
#F90 := mpif90


#
#   Libraries
#

# AMReX uses MPI in both C++ and Fortran.  Because CXX is used for linking, you
# MAY need to provide path to MPI Fortran library.
#LIBRARIES += -lmpif90


# If you're using Homebrew, you'll need to manually add /usr/local to the
# compilers search path

INCLUDE_LOCATIONS += /usr/local/include
LIBRARY_LOCATIONS += /usr/local/lib


# macOS Mojave canned the /usr/include directory. We now have to use the Xcode
# commandline tools for things like unistd.h

#INCLUDE_LOCATIONS += /Library/Developer/CommandLineTools/SDKs/MacOSX.sdk/usr/include
#LIBRARY_LOCATIONS += /Library/Developer/CommandLineTools/SDKs/MacOSX.sdk/usr/lib


# If you're using FFTW, you can keep that here

FFTW_DIR :=/usr/local/Cellar/fftw-mpich/3.3.8_1/lib


#
#   Other compiler flags
#

# When I run on my local desktop, I like to add this gfortran flag.

FFLAGS   += -fcheck=array-temps
F90FLAGS += -fcheck=array-temps


# Instead of linking to static gfortran library, I like to use shared
# libraries.

gfortran_libso_dir := $(dir $(shell $(F90) -print-file-name=libgfortran.so))
LIBRARY_LOCATIONS += $(gfortran_libso_dir)
gfortran_lib = -lgfortran
quadmath_lib = -lquadmath


# `make print-CXXFLAGS` shows "-O0" is used.  I would like to replace it with
# "-O2".  Note that `:=` is needed to avoid recursive references.

CXXFLAGS := $(subst -O0,-O2,$(CXXFLAGS))


# Replace old C++ standard...

CXXFLAGS := $(subst -std=c++11,-std=c++14,$(CXXFLAGS))


# If This compiler has a bug.  I might have to remove an option from CXXFLAGS.
# The variable lowercase_comp is defined in Make.defs and it's the lower case
# version of $COMP.  Note that we are moving toward C++11/14.  So disabling
# C++11 is not an option.  This is just an example.

#ifeq ($(lowercase_comp),pg?compiler)
#  CXXFLAGS := $(filter-out --c++11,$(CXXFLAGS))
#endif

# CXXFLAGS += -stdlib=libc++ -isystem



#
#   Other settings used by AMReX's build system
#

# Always have verbosity on even if GNUmakefile set it to FALSE.

VERBOSE=TRUE


# By default ccache is not used unless USE_CCACHE is TRUE.  But I want the
# opposite.  That is ccache is used by default unless USE_CCACHE is FALSE.  But
# if I am using UPC++, I would like to turn ccache off.

#ifeq ($(USE_CCACHE),FALSE)
#  CCACHE =
#else ifeq ($(USE_UPCXX),TRUE)
#  CCACHE =
#else
#  CCACHE = ccache
#endif


# Maybe AMReX fails to configure makefile for MPI on your machine.  You could
# set MPI stuff here, and then compile with NO_MPI_CHECKING=TRUE to tell AMReX
# not to check MPI stuff.