On Wed, May 07, 2025 at 02:02:42PM +0200, Nicolas Schier wrote: > On Sat, 03 May 2025, Kees Cook wrote: > > > v3: move to include/generated, add touch helper > > v2: https://lore.kernel.org/lkml/[email protected]/ > > v1: https://lore.kernel.org/lkml/[email protected]/ > > > > Hi, > > > > This is my attempt to introduce dependencies that track the various > > compiler behaviors that may globally change the build that aren't > > represented by either compiler flags nor the compiler version > > (CC_VERSION_TEXT). Namely, this is to detect when the contents of a > > file the compiler uses changes. We have 3 such situations currently in > > the tree: > > > > - If any of the GCC plugins change, we need to rebuild everything that > > was built with them, as they may have changed their behavior and those > > behaviors may need to be synchronized across all translation units. > > (The most obvious of these is the randstruct GCC plugin, but is true > > for most of them.) > > > > - If the randstruct seed itself changes (whether for GCC plugins or > > Clang), the entire tree needs to be rebuilt since the randomization of > > structures may change between compilation units if not. > > > > - If the integer-wrap-ignore.scl file for Clang's integer wrapping > > sanitizer changes, a full rebuild is needed as the coverage for wrapping > > types may have changed, once again cause behavior differences between > > compilation units. > > I am unsure if it is too much detail, but I'd like to see some of these > infos in include/linux/compiler-version.h, too.
Yeah, that's a good idea. No reason to make people dig for the commit logs, etc -- it should be immediately discoverable. I've updated the patches to include the (slight rephrased) text above. Thanks! -- Kees Cook
