Compiler compatibility

WHIZARD 2, 3

For compiling WHIZARD 2 or 3, you need a Fortran compiler that supports the Fortran 2008 standard and is able to correctly compile Fortran 2008 programs. Unfortunately, not all of the currently available compilers meet this requirement.

Here is a list of compilers that have been validated to work with WHIZARD:

• gfortran (free; Intel PC/Linux/OSX; version >= 9.1.0): http://gcc.gnu.org/fortran/
• NAG Fortran (commercial; Intel PC/Linux/OSX; version >= 7.1): http://www.nag.com (but see the note below)
• Intel ifort (commercial; Intel PC/Linux/OSX; version >= 21.0.4): https://www.intel.com/content/www/us/en/developer/tools/oneapi/toolkits.html#gs.vw54ng

Regressions:

Compilers that are not complete F2003/2008 compilers and do not work (but might work in a very distant future):

• nvfortran (commercial; nVIDIA; version > 23.7) https://developer.nvidia.com/hpc-compilers has many F2003/08 features implemented already, but the backend of the compiler is still a bit too buggy to be reliably used.

For using the O'Mega matrix element generator which is part of the core of WHIZARD, you need the OCaml programming language (interpreter/compiler). This is available free of charge for most platforms from http://ocaml.org/. The Linux distributions of Debian, Mandrake, RedHat, and SuSE have it included. Version 4.08.0 or newer is required. (but see the note below)

Note for NAG users: For several versions of NAG, the standard debugging flag -g is referencing for historical reasons to the upsf90 debugger which is no longer supported. If you want to use debugging information set the -g90 flag referring to the dbx90 or gdb debuggers.

Note for OCaml with WHIZARD versions before 2.0.3: While for modern WHIZARD versions, OCaml 4.08.0 or newer is required, older versions of WHIZARD up to 3.1.2 needed OCaml 4.05.0, WHIZARD 3.0.0beta needed OCaml 4.02.3, while until WHIZARD 2.7.1 only needed OCaml 3.12.0 or newer, and even older versions of WHIZARD up to 2.0.2 only worked with OCaml versionsup to 3.11.X. WHIZARD versions prior to 2.8.2 did not compile with OCaml 4.08.0 or newer.

WHIZARD 1

For compiling WHIZARD 1, you need a Fortran compiler that supports the Fortran 90/95 standard and is able to correctly compile Fortran 90/95 programs. Almost all of the modern compilers meet this requirement.

Here is a list of compilers that have been validated to work with WHIZARD 1:

• Fujitsu/Lahey Fortran (Intel PC/Linux; version >= 8.0): http://www.lahey.com
• g95 (free; Intel PC/Linux; version >= 0.91): http://www.g95.org)
• gfortran (free; Intel PC/Linux; version >= 4.3.0): http://gcc.gnu.org/fortran/)
• Intel Fortran (Intel PC/Linux, 32 and 64 bit; version >= 8.0): http://www.intel.com
• NAG Fortran (Intel PC/Linux; version >= 9.0): http://www.nag.com
• SUN Fortran (free; Intel PC/Linux; version 8.3): http://developers.sun.com/sunstudio/
• PG Fortran (commercial; Portland Group; version >= 9.0) http://www.pgroup.com/

Compilers that have been reported not to work include:

• Pathscale Fortran.

For using the O'Mega matrix element generator cf. the information above for WHIZARD 2.

General information

Note that the performance of the WHIZARD executable varies substantially depending on the system, compiler, and compiler options.

Additional information is welcome; please contact us:

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