aboutsummaryrefslogtreecommitdiff
blob: 600d10702a36dcd01b0b5b879b46d1374ee4b9d3 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
# Copyright 1999-2011 Gentoo Foundation
# Distributed under the terms of the GNU General Public License v2
# $Header: $

# Author Justin Lecher <jlec@gentoo.org>
# Test functions provided by Sebastien Fabbro and Kacper Kowalik

# @ECLASS: fortran-2.eclass
# @MAINTAINER:
# jlec@gentoo.org
# sci@gentoo.org
# @BLURB: Simplify fortran compiler management
# @DESCRIPTION:
# If you need a fortran compiler, then you should be inheriting this eclass.
# 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 functions exported are pkg_pretend and 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

DEPEND="virtual/fortran"
RDEPEND="${DEPEND}"

# @FUNCTION: _write_testsuite
# @DESCRIPTION: writes fortran test code
# @INTERNAL
_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
# @DESCRIPTION:
# Takes fortran compiler as first argument and dialect as second.
# Checks whether the passed fortran compiler speaks the fortran dialect
# @INTERNAL
_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
# @DESCRIPTION:
# See if the fortran supports OpenMP.
# @INTERNAL
_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
# @DESCRIPTION: Detailed description how to handle fortran support
# @INTERNAL
_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_pretend
# @DESCRIPTION:
# Setup functionallity, checks for a valid fortran compiler and optionally for its openmp support.
fortran-2_pkg_pretend() {
	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
}

# @FUNCTION: fortran-2_pkg_setup
# @DESCRIPTION:
# In EAPI < 4 it calls the compiler check. This behavior is deprecated
# and will be removed at 01-Okt-2011. Please migrate to EAPI=4.
#
# Exports the FC and F77 variable according to the compiler checks.
fortran-2_pkg_setup() {
	if has ${EAPI:-0} 0 1 2 3; then
		ewarn "The support for EAPI=${EAPI} by the fortran-2.eclass"
		ewarn "will be end at 01-Okt-2011"
		ewarn "Please migrate your package to EAPI=4"
		fortran-2_pkg_pretend
	fi
	[[ -n ${F77} ]] || export F77=$(tc-getFC)
	[[ -n ${FC} ]] || export FC=$(tc-getFC)
}

case ${EAPI:-0} in
	1|2|3) EXPORT_FUNCTIONS pkg_setup ;;
	4) EXPORT_FUNCTIONS pkg_pretend pkg_setup ;;
	*) die "EAPI=${EAPI} is not supported" ;;
esac