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# Copyright 1999-2012 Gentoo Foundation
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# Distributed under the terms of the GNU General Public License v2
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# $Header: /var/cvsroot/gentoo-x86/eclass/fortran-2.eclass,v 1.9 2012/10/07 13:15:52 jlec Exp $
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# @ECLASS: fortran-2.eclass
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# @MAINTAINER:
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# jlec@gentoo.org
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# sci@gentoo.org
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# @AUTHOR:
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# Author Justin Lecher <jlec@gentoo.org>
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# Test functions provided by Sebastien Fabbro and Kacper Kowalik
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# @BLURB: Simplify fortran compiler management
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# @DESCRIPTION:
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# If you need a fortran compiler, then you should be inheriting this eclass and
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# adding virtual/fortran to your dependencies.
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# The eclass tests for working fortran compilers
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# and exports the variables FC and F77.
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# Optionally, it checks for extended capabilities based on
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# the variable options selected in the ebuild
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# The only phase function exported is fortran-2_pkg_setup.
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# @ECLASS-VARIABLE: FORTRAN_NEED_OPENMP
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# @DESCRIPTION:
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# Set to "1" in order to automatically have the eclass abort if the fortran
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# compiler lacks openmp support.
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: ${FORTRAN_NEED_OPENMP:=0}
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# @ECLASS-VARIABLE: FORTRAN_STANDARD
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# @DESCRIPTION:
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# Set this, if a special dialect needs to be supported.
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# Generally not needed as default is sufficient.
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#
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# Valid settings are any combination of: 77 90 95 2003
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: ${FORTRAN_STANDARD:=77}
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inherit eutils toolchain-funcs
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# @FUNCTION: _write_testsuite
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# @INTERNAL
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# @DESCRIPTION:
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# writes fortran test code
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_write_testsuite() {
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local filebase=${T}/test-fortran
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# f77 code
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cat <<- EOF > "${filebase}.f"
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end
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EOF
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# f90/95 code
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cat <<- EOF > "${filebase}.f90"
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end
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EOF
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# f2003 code
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cat <<- EOF > "${filebase}.f03"
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procedure(), pointer :: p
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end
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EOF
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}
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# @FUNCTION: _compile_test
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# @INTERNAL
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# @DESCRIPTION:
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# Takes fortran compiler as first argument and dialect as second.
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# Checks whether the passed fortran compiler speaks the fortran dialect
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_compile_test() {
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local filebase=${T}/test-fortran
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local fcomp=${1}
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local fdia=${2}
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local fcode=${filebase}.f${fdia}
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local ret
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[[ $# -eq 0 ]] && die "_compile_test() needs at least one argument"
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[[ -f ${fcode} ]] || _write_testsuite
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${fcomp} "${fcode}" -o "${fcode}.x" >&/dev/null
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ret=$?
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rm -f "${fcode}.x"
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return ${ret}
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}
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# @FUNCTION: _fortran-has-openmp
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# @INTERNAL
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# @DESCRIPTION:
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# See if the fortran supports OpenMP.
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_fortran-has-openmp() {
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local flag
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local filebase=${T}/test-fc-openmp
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local fcode=${filebase}.f
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local ret
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local _fc=$(tc-getFC)
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cat <<- EOF > "${fcode}"
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call omp_get_num_threads
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end
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EOF
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for flag in -fopenmp -xopenmp -openmp -mp -omp -qsmp=omp; do
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${_fc} ${flag} "${fcode}" -o "${fcode}.x" >&/dev/null
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ret=$?
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(( ${ret} )) || break
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done
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rm -f "${fcode}.x"
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return ${ret}
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}
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# @FUNCTION: _die_msg
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# @INTERNAL
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# @DESCRIPTION:
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# Detailed description how to handle fortran support
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_die_msg() {
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echo
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eerror "Please install currently selected gcc version with USE=fortran."
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eerror "If you intend to use a different compiler then gfortran, please"
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eerror "set FC variable accordingly and take care that the neccessary"
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eerror "fortran dialects are support."
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echo
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die "Currently no working fortran compiler is available"
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}
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# @FUNCTION: fortran-2_pkg_setup
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# @DESCRIPTION:
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# Setup functionallity, checks for a valid fortran compiler and optionally for its openmp support.
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fortran-2_pkg_setup() {
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local dialect
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: ${F77:=$(tc-getFC)}
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: ${FORTRAN_STANDARD:=77}
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for dialect in ${FORTRAN_STANDARD}; do
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case ${dialect} in
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77) _compile_test $(tc-getF77) || _die_msg ;;
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90|95) _compile_test $(tc-getFC) 90 || _die_msg ;;
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2003) _compile_test $(tc-getFC) 03 || _die_msg ;;
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2008) die "Future" ;;
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*) die "${dialect} is not a Fortran dialect." ;;
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esac
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done
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if [[ ${FORTRAN_NEED_OPENMP} == 1 ]]; then
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_fortran-has-openmp || \
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die "Please install current gcc with USE=openmp or set the FC variable to a compiler that supports OpenMP"
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fi
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tc-export F77 FC
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einfo "Using following Fortran compiler"
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einfo " F77: ${F77}"
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einfo " FC: ${FC}"
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}
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case ${EAPI:-0} in
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0|1|2|3|4|5) EXPORT_FUNCTIONS pkg_setup ;;
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*) die "EAPI=${EAPI} is not supported" ;;
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esac
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if in_iuse fortran; then
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DEPEND="fortran? ( virtual/fortran )"
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else
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DEPEND="virtual/fortran"
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fi
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RDEPEND="${DEPEND}"
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