Hi, This is the 6th version of the patches for fixing PR109071.
Adding -fdiagnotics-details into GCC to provide more hints to the end users on how the warnings come from, in order to help the user to locate the exact location in source code on the specific warnings due to compiler optimizations. compared to the 5th version, the only change is a slightly adjustment to the new move-history-rich-location.[h|cc] due to an additional param to simple_diagnostic_path's in r16-413. All the other are kept no change. bootstrapping and regression testing on both x86 and aarch64. No issues. Kees and Sam have been using this option for a while in linux kernel and other applications and both found very helpful. They asked me several times about the status of this work and hope the functionality can be available in GCC as soon as possible. The diagnostic part of the patch had been reviewed and approved by David already. Please review the middle-end part of the change. thanks a lot. Qing =================== The latest version of(5th version) is: https://gcc.gnu.org/pipermail/gcc-patches/2025-April/680336.html https://gcc.gnu.org/pipermail/gcc-patches/2025-April/680337.html https://gcc.gnu.org/pipermail/gcc-patches/2025-April/680338.html https://gcc.gnu.org/pipermail/gcc-patches/2025-April/680339.html The major improvements to this patch compared to version 3 are: 1. Divide the patch into 3 parts: Part 1: Add new data structure move_history, record move_history during transformation; Part 2: In warning analysis, Use the new move_history to form a rich location with a sequence of events, to report more context info of the warnings. Part 3: Add debugging mechanism for move_history. 2. Major change to the above Part 2, completely rewritten based on David's new class lazy_diagnostic_path. 3. Fix all issues identied By Sam; A. fix PR117375 (Bug in tree-ssa-sink.cc); B. documentation clarification; C. Add all the duplicated PRs in the commit comments; 4. Bootstrap GCC with the new -fdiagnostics-details on by default (Init (1)). exposed some ICE similar as PR117375 in tree-ssa-sink.cc, fixed.
