v6-28 Backport cling fixes for ATLAS #14423
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The llvm9 JIT issued callbacks when a symbol was missing and we reacted on it by loading the relevant library. In root-project/root@9b2041e3 we have kept the logic but now the JIT started querying more often even for symbols which are okay to be missing. In turn that leads to scanning all libraries causing performance issues. This patch tries to limit this functionality only in contexts where automatic loading is allowed.
Co-authored-by: Jonas Hahnfeld <[email protected]>
Symbol lookup is a quite expensive operation and might result in JIT compilation and library loading. Co-authored-by: Jonas Hahnfeld <[email protected]>
This allows us to avoid generating symbols in libCore for these constants keeping the same amount of open calls at ROOT startup time.
`TInterpreter::Declare` does not support issuing statements on the global scope, while `TInterpreter::ProcessLine` does. This test was first introduced in a development version of ROOT (6.31), where the upgrade to LLVM16 was already in place. In that scenario, clang supports global scope statements (thanks to changes made for clang-repl). Applying the test to ROOT 6.30 uncovered the problem, since the clang of LLVM13 does not support global scope statements. Fix the test by using `ProcessLine` instead of `Declare` which does the intended thing independently from the ROOT version. Co-authored-by: Vassil Vassilev <[email protected]>
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Backports of #14358