On 2017-04-22 11:30-0000 Christian Pfeiffer wrote:
On 4/22/2017 7:33 AM, C Bergström wrote:
On Thu, Apr 20, 2017 at 4:12 AM, Alan W. Irwin
<ir...@beluga.phys.uvic.ca> wrote:
[...]
Especially since that Fortran information is already collected in
well-organized form in on one place, namely
<http://www.fortranplus.co.uk/app/download/23704631/fortran_2003_2008_compiler_support.pdf>.
With my Fortran compiler vendor hat on - Please do be aware that this
list of supported features may not be 100% accurate.
On 4/22/2017 7:33 AM, C Bergström wrote:
#1 Vendors can add support that hasn't been reflected in that document
#2 Not all claimed support is created equal. There's quite a few F2K3
OO features that someone can claim to support, but when you start
digging into real code they just flat out fail. (maybe less of the
case now than it was before)
#3 F2K8 aka CAF features could be supported, but may require
additional runtime libraries or 3rd party software to actually work.
For example our implementation ties to specific hardware and may not
be 100% portable. Other implementations may depend on OpenMPI and not
work with MPICH.
I guess I'm saying that auto-detecting this stuff is cool, but do
ensure that someone can easily override it. If as a vendor I say we
support F2K8 and I'd like that enabled by default for supported
versions of the compiler I really don't want to fight against some
auto-test which might think otherwise.
Agreed.
I reckon working with the document is the most accurate option, though.
Agreed! CMake is well ahead of the game here because of the existence
of this well-maintained document. Furthmore, the document can be
parsed (see discussion of that at
<https://gitlab.kitware.com/cmake/cmake/issues/16819>) which is
another big advantage for the CMake developers. My impression from
the forward of this document is this is a collection of information
that is supplied by the various vendors, but apparently they have been
reasonably honest about that assessment because there are lots of
non-"Y" results in the tables (for no claimed support for a given
sub-feature). (See the overall totals for "Y" results that I
tabulated at <https://gitlab.kitware.com/cmake/cmake/issues/16819>
which for many vendors show far less than complete compliance with the
Fortran 2003 and Fortran 2008 standards.
So if a vendor does not claim support for a given sub-feature of the
Fortran 2003 and Fortran 2008 standards with a "Y", then I believe
them! But as I think everyone will agree here, if they claim support
for a given sub-feature with a "Y", then that claim has to be taken
with a grain of salt by developers of CMake-based build systems for
Fortran projects and the users of such projects.
It should be possible tooverride it somehow, since it can't be
completely accurate nor updating outside of its 6-month cycle.
I assume this extremely useful Fortran information from CMake would
only be informational, and it would be up to developers of CMake-based
build-systems what they did with that useful (especially for the
non-"Y" case) information. And the documentation of the proposed
CMAKE_Fortran_KNOWN_FEATURES feature should make that useful
distinction between lack of claim for support (likely reliable), and
claim of support (substantially less reliable).
Alan
__________________________
Alan W. Irwin
Astronomical research affiliation with Department of Physics and Astronomy,
University of Victoria (astrowww.phys.uvic.ca).
Programming affiliations with the FreeEOS equation-of-state
implementation for stellar interiors (freeeos.sf.net); the Time
Ephemerides project (timeephem.sf.net); PLplot scientific plotting
software package (plplot.sf.net); the libLASi project
(unifont.org/lasi); the Loads of Linux Links project (loll.sf.net);
and the Linux Brochure Project (lbproject.sf.net).
__________________________
Linux-powered Science
__________________________
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