This causes problems both in depedency generation, since clang ignores
headers marked as system, and due to the order in which headers are
processed (build directory is marked as system when TBB is builtin).

in ROOT6 there is only one kind of reflection information. For this
reason, also the neighbouring references to Reflex have been removed.

There are two problems with this test and cxxmodules. First, it picks up a
header files from $ROOTSYS/include and builds a library. Naturally, we should
build pcm files, however, building module MathCore requires specific -I to
build the needed VecCore and Vc components. This test does not have access
to the include relevant include paths. Secondly, if we want to reuse the
modules from ROOT which makes most sense we can't because we get a hard
error such as: fatal error: malformed or corrupted AST file:
'SourceLocation remap refers to unknown module, cannot find include/pcms/1WYSNQV9VBZK7/stl-2OZGQN92C38MI.pcm

We can fix the first point by moving out all VecCore-related headers
such as Math/Types.h and all of its includers in a separate module. Thus,
the current test will not require the VecCore (as in the textual case).
Alternatively, we can trace the origin of the fatal error and try to remap
the source locations.

The test should reuse the prebuilt modules in the module cache. However,
due to a mismatch between the module-related flags exported by FindROOT.
There is a mismatch between the -D passed by cmake.

This patch make sure that the build arguments match more closely the build
setup of ROOT. Thus we can reuse the already built module files.

(axis title offset saving in C file)

Introduced by commit fc5d4ce6.

The buffer tests for histograms have slightly different
rounding errors between buffered/not buffered histograms
which exceed a few epsilons, so the test fails if the
tolerances are too strict.

The test merging histogram with labels, which have been filled using SetBinContent() and ResetStats to compute the entry, fails in older ROOT versions

This reverts commit 52a910dc.

* Revert "[cxxmodules] Exclude TFormula test"

This reverts commit 6bcb2422.

* Revert "[cxxmodules] Exclude remaining tests"

This reverts commit bea06e82.

* Revert "[cxxmodules] Temporary excluding tests for cxxmodules build bot"

This reverts commit 7a3e417c.

* [cxxmodules] Enable 17 tests and exclude 3 tests

Recent change to master fixed some tests which were excluded previously,
       let's enable them again.

Renaming as requested by Lorenzo.

Fixes: [ROOT-9216](https://sft.its.cern.ch/jira/browse/ROOT-9216)

Excluded tdf012_DefinesAndFiltersAsStrings, stressvector-interpreted,
         stressmathcore-interpreted when runtime_cxxmodules is On.

This excludes tests which are failing in runtime modules nightly builds.
We want to add runtime modules bot to incrementals and PRs so that
people can fix their bugs before commiting.

Fix the configuration to find Blas and decide either to build CPU or GPU architecture. Define this in RCondifure.h

Changing option name according better option semantic/documentation cases and extending it to be more generic (supporting zlib, lz4 and lzma)

Fix a compiler warning

Fix correctly hanflying of whitespace in parameter names. Due to a bug in handling the parameter name, reconstruction a function from an expression with white space did not work