Date: Fri, 5 Jan 2007 23:36:41 GMT From: NAKATA@FreeBSD.org, Maho<maho@FreeBSD.org> To: freebsd-gnats-submit@FreeBSD.org Subject: ports/107601: [RFC] Add WANT_FORTRAN knob: migration to gfortran (Fortran 90/95) Message-ID: <200701052336.l05NafaS052702@www.freebsd.org> Resent-Message-ID: <200701052340.l05NeFw3048519@freefall.freebsd.org>
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>Number: 107601 >Category: ports >Synopsis: [RFC] Add WANT_FORTRAN knob: migration to gfortran (Fortran 90/95) >Confidential: no >Severity: serious >Priority: low >Responsible: freebsd-ports-bugs >State: open >Quarter: >Keywords: >Date-Required: >Class: change-request >Submitter-Id: current-users >Arrival-Date: Fri Jan 05 23:40:15 GMT 2007 >Closed-Date: >Last-Modified: >Originator: NAKATA, Maho >Release: 6.1 >Organization: FreeBSD.org >Environment: FreeBSD debussy.private.org 6.1-STABLE FreeBSD 6.1-STABLE #0: Sat Sep 9 08:10:00 JST 2006 maho@debussy.private.org:/usr/src/sys/i386/compile/MAHO i386 >Description: gcc42 supports Fortran90/95 as gfortran. The Fortran compiler comes with gcc3 or earlier are g77; Fortran77. Recently a number of software are written in Fortran90/95, thus migration is desirable. * No binary compatibility between g77/gfortran. thus we must recompile. -> if a port depends on fortran90/95 thus gfortran, and math/lapack or math/blas, lapack and blas must be compiled with gfortran. >How-To-Repeat: >Fix: Add WANT_FORTRAN knob in bsd.port.mk (or something like that) approreately. * WANT_FORTRAN=yes We install gfortran42 (or later version) if not present in the system. and we use gfortran42 as FC and F77. * WANT_FORTRAN=f77 Install g77 if not present in the system. This is highly unrecommended, just for isolated port and legacy reason. * WANT_FORTRAN=ifc Install lang/ifc. This compiler is efficient for high performance computing, but not a free software. IMHO in this way, we can migrate to gfortran smoothly. 1. If FreeBSD 7 will not include gfortran42 but gcc42, and ports will install gfortran42 in lang/gcc42. * Fortran 77 (a case that g77 is required) -> FBSD7 : USE_GCC=3.4 is enough. -> FBSD6 : USE_GCC=3.4 is simply ignored. -> FBSD5 : USE_GCC=3.4 will install g77-34 and fine with it. * Fortran 90/95 -> FBSD7 : WANT_FORTRAN knob is mandatory for Fortran 90 as USE_GCC=4.2+ won't install gfortran42 automatically. -> FBSD 5 and 6: USE_GCC=4.2+ will install gfortran42 and this is enough. 2. If FreeBSD 7 will include gfortran42, and ports will install gfortran42 with USE_GCC=4.2+ * Fortran 77 (g77 is required) -> FBSD7 : USE_GCC=3.4 is enough. -> FBSD6 : USE_GCC=3.4 is simply ignored. -> FBSD5 : USE_GCC=3.4 will install g77-34 and fine with it. * Fortran 90/95 -> FBSD7 : USE_GCC=4.2+, gfortran42 in the base system is used. -> FBSD 5 and 6: USE_GCC=4.2+ will install gfortran42 and this is okay. 3. If FreeBSD 7 will not include gfortran42, and ports will install gfortran in lang/gfortran. * Fortran 77 (g77 is required) -> FBSD7 : USE_GCC=3.4 is enough. -> FBSD6 : USE_GCC=3.4 is simply ignored. -> FBSD5 : USE_GCC=3.4 will install g77-34 and fine with it. * Fortran 90/95 -> FBSD7 : Creation WANT_FORTRAN knob is mandatory (will install lang/gfortran) -> FBSD 5 and 6: Creation WANT_FORTRAN knob is mandatory. (will install lang/gfortran) Cons: always install gfortran42, thus gcc42, g++42 as well. ;) The first step might be adding dummy knob WANT_FORTRAN for ports that requires Fortran77 or Fortran90/95, to identify which ports are using Fortran. >Release-Note: >Audit-Trail: >Unformatted:
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