[DO NOT MERGE][Testing] Review Clang patches#20552

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devajithvs wants to merge 18 commits intoroot-project:masterfrom

devajithvs:testing-llvm-patches

Commits on Jan 22, 2026

Revert all downstream commits
devajithvs
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Revert "Implement FileManager uncaching."

vgvassilev
authored and
devajithvs
committed
Revert "[clang] Add API to iterate already loaded specializations"

hahnjo
authored and
devajithvs
committed
Access sema internals and revert the list of unused decls.

vgvassilev
authored and
devajithvs
committed
More RAIIs for autoloading.

authored and
devajithvs
committed
Also store Parser paren numbers; likely fixes ROOT-6976:

Axel-Naumann
authored and
devajithvs
committed
Provide (possibly updated) CodegenOpts to StartModule.

Axel-Naumann
authored and
devajithvs
committed
Restore pre-LLVM20 behaviour in HeaderSearch::LookupFile
devajithvs
committed
Implement a module attribute 'optional' to allow missing headers.

vgvassilev
authored and
devajithvs
committed
Remove macro and print macro.

CristinaCristescu
authored and
devajithvs
committed
Cleanup cached constant (.str) from codegen.

Axel-Naumann
authored and
devajithvs
committed
Buffer the pending instantiations in case or recursive parsing.

Axel-Naumann
authored and
devajithvs
committed
Add method to forget generated declarations

hahnjo
authored and
devajithvs
committed
Add (debug) printout of ModuleBuilder data structures

vgvassilev
authored and
devajithvs
committed
Add RAII to buffer delayed infos, for recursive parsing.

Axel-Naumann
authored and
devajithvs
committed
Refactor generation counter in LLVM

vgvassilev
authored and
devajithvs
committed
Import various changes to the global module index.

vgvassilev
authored and
devajithvs
committed
Move ParserCurTokRestoreRAII to cling
devajithvs
committed

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[DO NOT MERGE][Testing] Review Clang patches#20552

[DO NOT MERGE][Testing] Review Clang patches#20552
devajithvs wants to merge 18 commits intoroot-project:masterfrom
devajithvs:testing-llvm-patches

Commits on Jan 22, 2026

Revert all downstream commits

Revert "Implement FileManager uncaching."

Revert "[clang] Add API to iterate already loaded specializations"

Access sema internals and revert the list of unused decls.

More RAIIs for autoloading.

Also store Parser paren numbers; likely fixes ROOT-6976:

Provide (possibly updated) CodegenOpts to StartModule.

Restore pre-LLVM20 behaviour in HeaderSearch::LookupFile

Implement a module attribute 'optional' to allow missing headers.

Remove macro and print macro.

Cleanup cached constant (.str) from codegen.

Buffer the pending instantiations in case or recursive parsing.

Add method to forget generated declarations

Add (debug) printout of ModuleBuilder data structures

Add RAII to buffer delayed infos, for recursive parsing.

Refactor generation counter in LLVM

Import various changes to the global module index.

Move ParserCurTokRestoreRAII to cling