On Tue, Jul 21, 2020 at 12:40 PM Greg KH <gregkh@xxxxxxxxxxxxxxxxxxx> wrote: > > On Mon, Jul 20, 2020 at 09:19:38PM -0700, Fangrui Song wrote: > > When CROSS_COMPILE is set (e.g. aarch64-linux-gnu-), if > > $(CROSS_COMPILE)elfedit is found at /usr/bin/aarch64-linux-gnu-elfedit, > > GCC_TOOLCHAIN_DIR will be set to /usr/bin/. --prefix= will be set to > > /usr/bin/ and Clang as of 11 will search for both > > $(prefix)aarch64-linux-gnu-$needle and $(prefix)$needle. > > > > GCC searchs for $(prefix)aarch64-linux-gnu/$version/$needle, > > $(prefix)aarch64-linux-gnu/$needle and $(prefix)$needle. In practice, > > $(prefix)aarch64-linux-gnu/$needle rarely contains executables. > > > > To better model how GCC's -B/--prefix takes in effect in practice, newer > > Clang (since > > https://github.com/llvm/llvm-project/commit/3452a0d8c17f7166f479706b293caf6ac76ffd90) > > only searches for $(prefix)$needle. Currently it will find /usr/bin/as > > instead of /usr/bin/aarch64-linux-gnu-as. > > > > Set --prefix= to $(GCC_TOOLCHAIN_DIR)$(CROSS_COMPILE) > > (/usr/bin/aarch64-linux-gnu-) so that newer Clang can find the > > appropriate cross compiling GNU as (when -no-integrated-as is in > > effect). > > > > Reported-by: Nathan Chancellor <natechancellor@xxxxxxxxx> > > Signed-off-by: Fangrui Song <maskray@xxxxxxxxxx> > > Reviewed-by: Nathan Chancellor <natechancellor@xxxxxxxxx> > > Tested-by: Nathan Chancellor <natechancellor@xxxxxxxxx> > > Tested-by: Nick Desaulniers <ndesaulniers@xxxxxxxxxx> > > Link: https://github.com/ClangBuiltLinux/linux/issues/1099 > > --- > > Changes in v2: > > * Updated description to add tags and the llvm-project commit link. > > * Fixed a typo. > > > <formletter> > > This is not the correct way to submit patches for inclusion in the > stable kernel tree. Please read: > https://www.kernel.org/doc/html/latest/process/stable-kernel-rules.html > for how to do this properly. > > </formletter> > Hi Fangrui, your patch needs to be accepted first in Linus tree - among other things to have a unique commit-id for inclusion into any affected Linux-stable trees. Regards, - Sedat -
