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# Copyright 1999-2012 Gentoo Foundation
# Distributed under the terms of the GNU General Public License v2
# $Header: /var/cvsroot/gentoo-x86/eclass/fortran-2.eclass,v 1.6 2012/09/27 16:35:41 axs Exp $
# @ECLASS: fortran-2.eclass
# @MAINTAINER:
# jlec@gentoo.org
# sci@gentoo.org
# @AUTHOR:
# Author Justin Lecher <jlec@gentoo.org>
# Test functions provided by Sebastien Fabbro and Kacper Kowalik
# @BLURB: Simplify fortran compiler management
# @DESCRIPTION:
# If you need a fortran compiler, then you should be inheriting this eclass and
# adding virtual/fortran to your dependencies.
# The eclass tests for working fortran compilers
# and exports the variables FC and F77.
# Optionally, it checks for extended capabilities based on
# the variable options selected in the ebuild
# The only phase function exported is fortran-2_pkg_setup.
# @ECLASS-VARIABLE: FORTRAN_NEED_OPENMP
# @DESCRIPTION:
# Set to "1" in order to automatically have the eclass abort if the fortran
# compiler lacks openmp support.
: ${FORTRAN_NEED_OPENMP:=0}
# @ECLASS-VARIABLE: FORTRAN_STANDARD
# @DESCRIPTION:
# Set this, if a special dialect needs to be supported.
# Generally not needed as default is sufficient.
#
# Valid settings are any combination of: 77 90 95 2003
: ${FORTRAN_STANDARD:=77}
inherit toolchain-funcs
# @FUNCTION: _write_testsuite
# @INTERNAL
# @DESCRIPTION:
# writes fortran test code
_write_testsuite() {
local filebase=${T}/test-fortran
# f77 code
cat <<- EOF > "${filebase}.f"
end
EOF
# f90/95 code
cat <<- EOF > "${filebase}.f90"
end
EOF
# f2003 code
cat <<- EOF > "${filebase}.f03"
procedure(), pointer :: p
end
EOF
}
# @FUNCTION: _compile_test
# @INTERNAL
# @DESCRIPTION:
# Takes fortran compiler as first argument and dialect as second.
# Checks whether the passed fortran compiler speaks the fortran dialect
_compile_test() {
local filebase=${T}/test-fortran
local fcomp=${1}
local fdia=${2}
local fcode=${filebase}.f${fdia}
local ret
[[ $# -eq 0 ]] && die "_compile_test() needs at least one argument"
[[ -f ${fcode} ]] || _write_testsuite
${fcomp} "${fcode}" -o "${fcode}.x" >&/dev/null
ret=$?
rm -f "${fcode}.x"
return ${ret}
}
# @FUNCTION: _fortran-has-openmp
# @INTERNAL
# @DESCRIPTION:
# See if the fortran supports OpenMP.
_fortran-has-openmp() {
local flag
local filebase=${T}/test-fc-openmp
local fcode=${filebase}.f
local ret
local _fc=$(tc-getFC)
cat <<- EOF > "${fcode}"
call omp_get_num_threads
end
EOF
for flag in -fopenmp -xopenmp -openmp -mp -omp -qsmp=omp; do
${_fc} ${flag} "${fcode}" -o "${fcode}.x" >&/dev/null
ret=$?
(( ${ret} )) || break
done
rm -f "${fcode}.x"
return ${ret}
}
# @FUNCTION: _die_msg
# @INTERNAL
# @DESCRIPTION:
# Detailed description how to handle fortran support
_die_msg() {
echo
eerror "Please install currently selected gcc version with USE=fortran."
eerror "If you intend to use a different compiler then gfortran, please"
eerror "set FC variable accordingly and take care that the neccessary"
eerror "fortran dialects are support."
echo
die "Currently no working fortran compiler is available"
}
# @FUNCTION: fortran-2_pkg_setup
# @DESCRIPTION:
# Setup functionallity, checks for a valid fortran compiler and optionally for its openmp support.
fortran-2_pkg_setup() {
local dialect
: ${F77:=$(tc-getFC)}
: ${FORTRAN_STANDARD:=77}
for dialect in ${FORTRAN_STANDARD}; do
case ${dialect} in
77) _compile_test $(tc-getF77) || _die_msg ;;
90|95) _compile_test $(tc-getFC) 90 || _die_msg ;;
2003) _compile_test $(tc-getFC) 03 || _die_msg ;;
2008) die "Future" ;;
*) die "${dialect} is not a Fortran dialect." ;;
esac
done
if [[ ${FORTRAN_NEED_OPENMP} == 1 ]]; then
_fortran-has-openmp || \
die "Please install current gcc with USE=openmp or set the FC variable to a compiler that supports OpenMP"
fi
tc-export F77 FC
}
case ${EAPI:-0} in
0|1|2|3|4|5) EXPORT_FUNCTIONS pkg_setup ;;
*) die "EAPI=${EAPI} is not supported" ;;
esac
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