================ @@ -412,6 +412,20 @@ New Compiler Flags only for thread-local variables, and none (which corresponds to the existing ``-fno-c++-static-destructors`` flag) skips all static destructors registration. +- The ``-fextend-variable-liveness`` flag has been added to allow for improved + debugging of optimized code. Using ``-fextend-variable-liveness`` will cause + Clang to generate code that tries to preserve the liveness of source variables + through optimizations, meaning that variables will typically be visible in a + debugger more often. The flag has two levels: ``-fextend-variable-liveness``, + or ``-fextend-variable-liveness=all``, extendes the liveness of all user + variables and the ``this`` pointer. Alternatively ``-fextend-this-ptr``, or ---------------- zygoloid wrote:
Looks like the flag name supported is `-fextend-this-ptr-liveness`, not `-fextend-this-ptr`. I also wonder whether the `-fextend-this-ptr-liveness` flag carries its weight -- we've historically removed these special-case flags in favor of the more general things, as we did with `-fsanitize=` for example. I understand that this is being upstreamed from some existing deployment; does the alias help there? Having it around for a shorter time period with an intent to eventually remove it might be reasonable. https://github.com/llvm/llvm-project/pull/110000 _______________________________________________ cfe-commits mailing list cfe-commits@lists.llvm.org https://lists.llvm.org/cgi-bin/mailman/listinfo/cfe-commits
