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Hi, I did not manage to reproduce the libadalang build issue. Could you please provide a reproducer?

Apologize i can not send you an automated reproducer
I can reproduce using the steps below;

0. using the gnat_native 15.2.1 compiler from alire
1. build gpr2 using its alire crate (libgpr2_26.0.0_99e9d2cd) both in static and relocatable mode
2. install it
3. build libadalang using its alire crate (libadalang_26.0.0_75276b8d) both in static and relocatable mode
   the first errors pop up during the call to gprclean before the build, but more errors to follow during the build on other units once you fix them

cd FOLDER/alire/crates/libadalang_26.0.0_75276b8d
gprclean -p -P libadalang.gpr -XLIBRARY_TYPE=static -XBUILD_MODE=prod
gprclean -p -P libadalang.gpr -XLIBRARY_TYPE=relocatable  -XGNATCOLL_ICONV_BUILD=relocatable -XLANGKIT_SUPPORT_BUILD=relocatable -XGNATCOLL_GMP_BUILD=relocatable -XBUILD_MODE=prod
gpr2.gpr:25:1111: "gpr2.build.view_tables.update_sources_list" is not a unit of this project
gpr2.gpr:25:2862: "gpr2.tree_internal.load_autoconf" is not a unit of this project
gprclean: "libadalang.gpr" processing failed

Thank you for the reproducer!

First, I tried building libadalang with alire in relocatable mode, using the same versions, and alr build worked correctly from the libadalang crate.

If I understand correctly, you are not using the alr build / alr install commands, but invoking the GPR tools directly instead—correct?

Could you please elaborate a bit on the commands you ran? I tried using the GPR tools directly as in your comment, but I wasn’t able to reproduce the issue.