[rootcling] Remove check for unique_ptr members [v6.38]
#20399
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Since llvm/llvm-project@f5e687d libc++ implements _LIBCPP_COMPRESSED_PAIR with an anonymous struct (a Clang extension). This results in unique_ptr having a single FieldDecl with an empty name that does not appear as a data member in TClass. Instead, the AST has multiple IndirectFieldDecl's that "refer" into the anonymous struct. In ROOT, we now have two options: We could support anonymous structs, either by allowing data members with empty names or by adding all indirect field declarations as members. However, I would argue that we actually do NOT want to support this extension for IO classes. Instead remove the (questionable) check in rootcling that verifies the number of data members in unique_ptr. (cherry picked from commit fff03d2)
Since the previous commit, IsUnsupportedUniquePointer does not check the number of data members anymore. (cherry picked from commit a62a650)
pcanal
approved these changes
Nov 12, 2025
Test Results 22 files 22 suites 3d 22h 29m 41s ⏱️ Results for commit 4b9d991. |
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Since llvm/llvm-project@f5e687d libc++ implements
_LIBCPP_COMPRESSED_PAIRwith an anonymous struct (a Clang extension). This results inunique_ptrhaving a singleFieldDeclwith an empty name that does not appear as a data member inTClass. Instead, the AST has multipleIndirectFieldDecls that "refer" into the anonymous struct.In ROOT, we now have two options: We could support anonymous structs, either by allowing data members with empty names or by adding all indirect field declarations as members. However, I would argue that we actually do NOT want to support this extension for IO classes. Instead remove the (questionable) check in
rootclingthat verifies the number of data members inunique_ptr.Related to #20377, backport of #20389