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sternenseemann c3c4ef859a gprbuild, xmlada: init at 21.0.0
GPRbuild is a multi language build system developed by AdaCore which
is mostly used for build Ada-related projects using GNAT.

Since GPRbuild is used to build itself and its dependency library
XML/Ada we first build a bootstrap version of it using the provided
bash build script bootstrap.sh as the gprbuild-boot derivation.
gprbuild-boot is then used to build xmlada and the proper gprbuild
derivation.

GPRbuild has its own search path mechanism via GPR_PROJECT_PATH which
we address via a setupHook. It currently works quite similar to the
pkg-config one: It accumulates all inputs into GPR_PROJECT_PATH,
GPR_PROJECT_PATH_FOR_BUILD etc. However this is quite limited at the
moment as we don't have a gprbuild wrapper yet which understands the
_FOR_BUILD suffix. However, we'll need to address this in the future
as it is currently basically impossible to test since the distinction
only affects cross-compilation, but it is not possible to build a GNAT
cross-compiler in nixpkgs at the moment (I'm working on changing that,
however).

Another issue we had to solve was GPRbuild not finding the right GNAT
via its gprconfig tool: GPRbuild has a knowledge base with compiler
definitions which run some checks and collect info about binaries
which are in PATH. In the end the first compiler in PATH that supports
the desired language is selected.

We want GPRbuild to discover our wrapped GNAT since the unwrapped one
is incapable of producing working binaries since it won't find the
crt*.o objects distributed with libc. GPRbuild however needs to find
the Ada runtime distributed with GNAT which is not part of the wrapper
derivation, so it will skip the wrapper and select the unwrapped GNAT.
Symlinking the unwrapped's lib directory into the wrapper fixes this
problem, but breaks linking in some cases (e. g. when linking against
OMP from gcc, the runtime variant will shadow the problem dynamic lib
from buildInputs). Additionally it uses gnatls as an indicator it has
found GNAT which is not part of the wrapper.

The solution we opted to adopt here is to install a custom compiler
description into gprbuild's knowledge base which properly detects the
nixpkgs GNAT wrapper: It uses gnatmake to detect GNAT instead of
gnatls and discovers the runtime via a symlink we add to
`$out/nix-support`. This additional definition is enough to properly
detect GNAT, since the plain wrapped gcc detection works out of the
box. It may, however, be necessary to add special definitions for
other languages in the future where gprbuild also needs to discover
the runtime.

One future improvement would be to install libgpr into a separate
output or split it into a separate derivation (which would require to
link gprbuild statically always since otherwise we end up with a
cyclical dependency).
2021-08-03 14:58:49 +02:00
.github .github/labeler.yml: Label nixos-rebuild changes 2021-07-28 17:20:56 +02:00
doc Merge pull request #132351 from figsoda/rust-doc 2021-08-02 21:23:09 +01:00
lib lib.systems: add m68k-netbsd support 2021-08-01 15:27:12 +00:00
maintainers Merge pull request #121829 from davidak/pantheon-team 2021-08-03 10:20:20 +00:00
nixos Merge pull request #129413 from ngkz/binfmt-order-fix 2021-08-03 12:20:17 +01:00
pkgs gprbuild, xmlada: init at 21.0.0 2021-08-03 14:58:49 +02:00
.editorconfig Merge pull request #110395 from zowoq/gemset 2021-01-22 09:31:07 +01:00
.gitattributes gitattributes: disable merge=union in all-packages 2018-03-27 11:03:03 -05:00
.gitignore git ignore __pycache__ folders 2020-08-16 11:30:11 +02:00
.version 21.11 is Porcupine! 2021-05-22 18:14:06 -07:00
CONTRIBUTING.md CONTRIBUTING.md: Move to repo root, where it is more visible. 2021-06-26 04:51:38 +02:00
COPYING COPYING: 2020 -> 2021 2021-01-03 00:49:09 +00:00
default.nix docs: add -L to remaining curl install commands 2020-09-11 12:14:07 -07:00
flake.nix flake.nix: Only add _file-key if position of args.modules is actually known to the evaluator 2021-07-18 19:47:10 +02:00
README.md Merge pull request #124070 from dotlambda/sepa-transfers 2021-08-03 07:19:07 +02:00

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