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require 'requirement'
# There are multiple implementations of MPI-2 available.
# http://www.mpi-forum.org/
# This requirement is used to find an appropriate one.
class MPIDependency < Requirement
attr_reader :lang_list
fatal true
default_formula 'open-mpi'
env :userpaths
# This method must accept varargs rather than an array for
# backwards compatibility with formulae that call it directly.
def initialize(*tags)
@non_functional = []
@unknown_langs = []
@lang_list = [:cc, :cxx, :f77, :f90] & tags
tags -= @lang_list
super(tags)
end
def mpi_wrapper_works? compiler
compiler = which compiler
return false if compiler.nil? or not compiler.executable?
# Some wrappers are non-functional and will return a non-zero exit code
# when invoked for version info.
#
# NOTE: A better test may be to do a small test compilation a la autotools.
quiet_system compiler, '--version'
end
satisfy do
@lang_list.each do |lang|
case lang
when :cc, :cxx, :f90, :f77
compiler = 'mpi' + lang.to_s
@non_functional << compiler unless mpi_wrapper_works? compiler
else
@unknown_langs << lang.to_s
end
end
@unknown_langs.empty? and @non_functional.empty?
end
env do
# Set environment variables to help configure scripts find MPI compilers.
# Variable names taken from:
# http://www.gnu.org/software/autoconf-archive/ax_mpi.html
@lang_list.each do |lang|
compiler = 'mpi' + lang.to_s
mpi_path = which compiler
# Fortran 90 environment var has a different name
compiler = 'MPIFC' if lang == :f90
ENV[compiler.upcase] = mpi_path
end
end
end
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