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.\" ========================================================================
.\"
.IX Title "DH_FORTRAN_MOD 1"
.TH DH_FORTRAN_MOD 1 2024-02-05 "dh_fortran_mod v0.39" dh-fortran-mod
.\" For nroff, turn off justification.  Always turn off hyphenation; it makes
.\" way too many mistakes in technical documents.
.if n .ad l
.nh
.SH NAME
dh_fortran_mod \- Install Fortran 90 .mod files and add dependency information.
.SH SYNOPSIS
.IX Header "SYNOPSIS"
\&\fBdh_fortran_mod\fR   [\fB\-\-sourcedir=\fR\fIdir\fR] [$<\fIdebhelper options\fR>]
.SH DESCRIPTION
.IX Header "DESCRIPTION"
\&\fBdh_fortran_mod\fR is a debhelper program that finds Fortran module and submodule files and
adds dependencies to \fBgfortran\-$version\fR as required to the package using
via the variable \fB${fortran:Depends}\fR.
.PP
\&\fBdh_fortran_mod\fR is expected to be automatically added using the debhelper "addon" \fBfortran_mod\fR
ie. either automatically, by build-depending on 'dh\-sequence\-fortran\-mod', or explicitly:
.PP
.Vb 1
\&    dh $@ \-\-with fortran_mod
.Ve
.PP
\&\fBdh_fortran_mod\fRSearches the debian/ directory for files \fBdebian/pkg.fortran\-mod\fR$ which list
module files to include, with the same syntax as debhelper install files.
.SH OPTIONS
.IX Header "OPTIONS"
.IP \fB\-\-sourcedir=\fR\fIdir\fR 4
.IX Item "--sourcedir=dir"
Look in the specified directory for files to be installed.
.Sp
Typically Fortran module files are included in library development packages.
.SH TODO
.IX Header "TODO"
Add dh-fortran-mod support for generic fortran compilers (ifx, etc).
.Sp
.RS 4
\&\fBdh_fortran_mod\fR will be expanded to find mod files automatically from the \fIdebian/tmp\fR directory.
It will enable the installation of mod files in parallel for multiple compilers.
It will install .smod files for Fortran 2018.
.Sp
The fortran-mod file syntax follows dh_install: pairs of sources and optional target directories.
The default directory will be \f(CW$fmoddir\fR ( /usr/lib/$multiarch/fortran/$compiler_mod_directory/)
If the target directory is absolute (starts with a  '/'), this directory is used in the target package.
If the target  does not absolute, it will be treated as a subdirectory of \f(CW$fmoddir\fR.
.Sp
Currently four flavours of Fortran compiler are supported: gfortran\-*  ('gfortran'),
flang\-new\-* ('flang') , flang\-to\-external\-fc\-* ('flangext') and lfortran ('lfortran').
.Sp
\&\f(CW$compiler_mod_directory\fR is based on the compiler module version: currently gfortran\-mod\-15 for
gfortran\-13 (and older), flang\-mod\-15 for flang\-new\-15+ and lfortran\-mod\-0 for lfortran.
.Sp
For flang\-to\-external\-fc\-* the version is flangext\-mod\-15 (assuming gfortran\-13 as the external compiler);
in principle flang-to-external-fc ('flangext' flavour) and gfortran are intercompatible but 
intermixing is avoided.
.Sp
These will be updated for incompatible compiler versions.
.Sp
Support for Makefiles and debian/rules is given in /usr/share/debhelper/dh\-fortran/fortran\-support.mk
.Sp
This enables, for example:
.Sp
.Vb 3
\&        /usr/share/debhelper/dh\-fortran/fortran\-support.mk
\&        FMODDIR:= $(call get_fmoddir, gfortran)
\&        FC_EXE:= $(call get_fc_exe, $(FC_DEFAULT))
.Ve
.RE
.SH "SEE ALSO"
.IX Header "SEE ALSO"
\&\fBdebhelper\fR\|(7)
.SH AUTHORS
.IX Header "AUTHORS"
Sébastien Villemot <sebastien@debian.org>
Alastair McKinstry <mckinstry@debian.org>
.PP
Lots of code stolen shamelessly from dh_install (Joey Hess <joeyh@debian.org>).