Wiki - https://fedoraproject.org/wiki/Changes/Free_Pascal_cross-compilers
Discussion thread -
https://discussion.fedoraproject.org/t/f43-change-proposal-free-pascal-cross-compilers-self-contained/157263
This is a proposed Change for Fedora Linux.
This document represents a proposed Change. As part of the Changes
process, proposals are publicly announced in order to receive
community feedback. This proposal will only be implemented if approved
by the Fedora Engineering Steering Committee.
== Summary ==
Add cross-compilation support to the Free Pascal Compiler (FPC)
offered in Fedora.
== Owner ==
* Name: [[User:suve| Artur Frenszek-Iwicki]]
* Email: <fedora@svgames.pl>
== Detailed Description ==
The Free Pascal Compiler supports targeting many processor
architectures and operating systems, but so far only native targets
were supported in Fedora. This Change proposes adding several new
packages to the distribution (all built from the same `fpc` source
package), which can then be used for cross-compilation.
Two groups of packages will be introduced:
* '''`fpc-cross-$CPU`''', where `$CPU` is the name of the target
processor architecture - e.g. `fpc-cross-aarch64`. These packages will
provide system-agnostic cross-compilers.
* '''`fpc-units-$CPU-$OS`''', where `$CPU` is the name of the target
processor architecture, and `$OS` is the name of the target operating
system - e.g. `fpc-units-i386-win32`. These packages will provide
system-specific pre-compiled Pascal unit files (needed to build actual
working programs).
Units for the native target were already moved to a
`fpc-units-$CPU-$OS` package as part of
[[Changes/F38-FPC-repackaging]], so this naming convention should fit
the status quo.
== Benefit to Fedora ==
Free Pascal users needing to cross-compile their programs will be able
to use distribution-provided packages, instead of having the build the
compiler on their own.
== Scope ==
* Proposal owners: Make necessary changes to `fpc.spec` and build the
package in Rawhide.
* Other developers: None. Dependent packages should not require any changes.
* Release engineering: None.
* Policies and guidelines: N/A (not needed for this Change)
* Trademark approval: N/A (not needed for this Change)
* Alignment with the Fedora Strategy: Better integration of the Free
Pascal development stack.
== Upgrade/compatibility impact ==
For regular Free Pascal users who have not dealt with
cross-compilation, nothing should change.
Users who have rolled out their own cross-compilation setup and
installed it inside `/usr/lib/fpc` or `/usr/lib64/fpc` will need to
manually solve file conflicts, should they elect to install the new
packages.
== How To Test ==
The proposed packages can be installed from a COPR repo:
`[https://copr.fedorainfracloud.org/coprs/suve/fpcross/ suve/fpcross]`
Testers can install support for a target by using `dnf install
fpc-units-$CPU-$OS`, e.g. `fpc-units-aarch64-linux` or
`fpc-units-x86_64-win64`. The units package should pull in the
appropriate `binutils-$CPU-linux-gnu` and `fpc-cross-$CPU` packages,
if necessary. Once the cross-compiler and units are installed, one can
try compiling some test programs by using `fpc -P${CPU} -T${OS}
${FILE}.pas`.
== User Experience ==
No changes should be noticeable for users consuming FPC-compiled
programs, as well as developers using FPC for building native
programs.
Developers interested in using Free Pascal cross-compilers will be
able to install those from the repository, instead of building the
compiler on their own. There may be some extra work required for
building Pascal programs using external libraries.
== Dependencies ==
Changes to `fpc` are not dependent on any other packages.
The following packages depend on a working `fpc`:
* [https://src.fedoraproject.org/rpms/ccdciel ccdciel] (CCD capture software)
* [https://src.fedoraproject.org/rpms/colorful colorful] (side-view
shooter game)
* [https://src.fedoraproject.org/rpms/cqrlog cqrlog] (amateur radio
contact logging program)
* [https://src.fedoraproject.org/rpms/diffoscope diffoscope] (in-depth
comparison of files, archives, and directories)
* [https://src.fedoraproject.org/rpms/doublecmd doublecmd] (file
manager with two panels)
* [https://src.fedoraproject.org/rpms/fpc fpc] (Free Pascal Compiler)
* [https://src.fedoraproject.org/rpms/gearhead1 gearhead1] (roguelike
mecha role-playing game)
* [https://src.fedoraproject.org/rpms/gearhead2 gearhead2] (roguelike
mecha role-playing game in space)
* [https://src.fedoraproject.org/rpms/goverlay goverlay] (graphical UI
to help manage Linux overlays)
* [https://src.fedoraproject.org/rpms/hedgewars hedgewars] (turn-based
artillery game featuring fighting Hedgehogs)
* [https://src.fedoraproject.org/rpms/indistarter indistarter] (GUI to
start, stop and control an INDI server)
* [https://src.fedoraproject.org/rpms/lazarus lazarus] (Lazarus
Component Library and IDE for Free Pascal)
* [https://src.fedoraproject.org/rpms/lazpaint lazpaint] (simple image editor)
* [https://src.fedoraproject.org/rpms/nbc nbc] (simple language and
compiler to program the LEGO NXT brick)
* [https://src.fedoraproject.org/rpms/pasdoc pasdoc] (documentation
tool for Pascal and Object Pascal source code)
* [https://src.fedoraproject.org/rpms/skychart skychart] (planetarium
software for the advanced amateur astronomer)
== Contingency Plan ==
* Contingency mechanism: Revert to last working version of `fpc.spec`
and rebuild the package.
* Contingency deadline: Before the Beta Freeze.
* Blocks release? No
== Documentation ==
Free Pascal wiki pages:
* [https://wiki.freepascal.org/Binutils Binutils]
* [https://wiki.freepascal.org/Cross_compiling Cross compiling]
* [https://wiki.freepascal.org/Free_Pascal_supported_targets Free
Pascal supported targets]
== Release Notes ==
Fedora Linux 43 ships with cross-compilation support for the Free
Pascal Compiler, through several new packages. Users interested in
cross-compiling for MS Windows should install the
`fpc-units-x86_64-win64` or `fpc-units-i386-win32` packages. For
cross-compiling for Linux to other architectures, install the
appropriate `fpc-units-$ARCH-linux`
package. Note that you may need to perform some extra steps if you
want your cross-compiled Pascal programs to link against external
libraries.
--
Aoife Moloney
Fedora Operations Architect
Fedora Project
Matrix: @amoloney:fedora.im
IRC: amoloney
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