MaskRay added a comment. When -mfentry is specified, why should frame pointers be disabled? Is that because the Linux kernel has assumption about the exact code sequence? `call __fentry__` is the first instruction. Isn't that sufficient?
(There is another difference. GCC emits `call *__fentry__@GOTPCREL(%rip)` in -fpie/-fpic mode. At first glance, this looks suboptimal to me. I don't expect `__fentry__` to be interposed.) (This may be another example demonstrating that piggybacking an option (-mfentry) on top of an existing one (-pg) can turn out to be a bad idea...) Repository: rG LLVM Github Monorepo CHANGES SINCE LAST ACTION https://reviews.llvm.org/D74698/new/ https://reviews.llvm.org/D74698 _______________________________________________ cfe-commits mailing list cfe-commits@lists.llvm.org https://lists.llvm.org/cgi-bin/mailman/listinfo/cfe-commits
