[xrootd] error when building: XROOTD_CLIENT_LIBRARIES-NOTFOUND

[ferdymercury]

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Description

Sometimes I get this error when rebuilding ROOT (configure step works fine):

10:42:13: Starting: "/usr/bin/cmake" --build /home/user/build/build-ROOT-Desktop-Debug --target all
ninja: error: 'XROOTD_CLIENT_LIBRARIES-NOTFOUND', needed by 'lib/libNetxNG.so', missing and no known rule to make it
10:42:13: The command "/usr/bin/cmake --build /home/user/build/build-ROOT-Desktop-Debug --target all" terminated with exit code 1.

Clicking on rebuilding or reconfiguring does not help.

xrootd is ON, builtin_xrootd is OFF

[cmake] -- Looking for XROOTD
[cmake] -- Enabled support for:  asimage asimage_tiff asserts builtin_clang builtin_cling builtin_civetweb builtin_gsl builtin_llvm builtin_nlohmannjson builtin_openui5 builtin_vdt check_connection clad curl dataframe gdml geom http imt mathmore opengl pyroot roofit root7 runtime_cxxmodules shared spectrum ssl thisroot_scripts tmva tmva-cpu tmva-cudnn tpython use_gsl_cblas vdt webgui x11 xml xrootd

I am forced to set xrootd=OFF to continue building.

Reproducer

I am not sure how to reproduce it exactly.

ROOT version

master debug build

Installation method

Source

Operating system

Ubu22.04

Additional context

Maybe related to:

root/cmake/modules/SearchInstalledSoftware.cmake

Line 714 in e333286

unset(XROOTD_${suffix} CACHE)

If a prerequisite is missing, this should already fail at configure step, not when building, with cryptic error message. Or it should autodisable xrootd if requisite is missing.

fyi @amadio

[amadio]

This is likely not a bug, just a side effect of an old version of XRootD being the one available in Ubuntu.

[ferdymercury]

Yes, I agree there is something fishy with Ubu22.04 apt repo. But ROOT should be asking for REQUIRED components CLIENT UTILS at configure time, since it's linking to XrdCl and XrdUtils, rather than failing at build time (linked PR solves that).