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. Kind regards, Nicolas
