On 5/6/24 10:09 AM, Kees Cook wrote:
On Fri, May 03, 2024 at 07:23:01PM -0700, John Hubbard wrote:
clang doesn't deal well with "-pie -static": it warns that -pie is an unused option here. Changing to "-fPIE -static" solves this problem for clang, while keeping the gcc results identical.
The problem is visible when building via:
make LLVM=1 -C tools/testing/selftestsAgain: gcc 13 produces identical binaries for all of these programs, both before and after this commit (using "-pie"), and after (using "-fPIE").
Also, the runtime results are the same for both clang and gcc builds.
Thanks for this! It got solved differently here: https://lkml.kernel.org/r/20240416152831.3199999-1-usama.anjum@collabora.com
Does that work for you as well?
Yes it does. Please drop my patch and let's use yours instead, thanks!
(As an aside, outside of the compiler sources themselves, it has proven quite difficult to find any in-depth documentation of linking options and behavior--now, and in the past.)
thanks,