[Build] fail-on-missing contract not respected for NOT http AND webgui

@linev

If you want to build webgui=ON but have set http=OFF, the configuration step will disable webgui for you, even with fail-on-missing=ON. That's against the contract: features are not allowed to be silently disabled when requirement are missing, but the build should fail in that case. See SearchInsalledSoftware.cmake for how this is usually handled.

See https://github.com/root-project/root/blob/master/cmake/modules/RootBuildOptions.cmake#L368, the check introduced by 48ee1ed.

FYI @linev, @ferdymercury

It is relatively old code, now one can issue error instead disabling webgui option.

There are other such places like

if(unfold AND NOT xml)
  message(STATUS "Cannot enable unfold without enabling xml: unfold is disabled.")
  set(unfold OFF)
endif()

I already fixed all these snippets in #23092

I already fixed all these snippets in #23092

Grate!
I fear you will need to rebase it many times before we merge it.
Please wait until many small fixes will be applied and probably backported to 6.42

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[Build] `fail-on-missing` contract not respected for `NOT http AND webgui` #23907

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[Build] fail-on-missing contract not respected for NOT http AND webgui #23907

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linev commented on Oct 30, 2026

ferdymercury commented on Oct 30, 2026

linev commented on Oct 30, 2026

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[Build] `fail-on-missing` contract not respected for `NOT http AND webgui` #23907