kernel: restore crtsavres.o to enable building external modules on powerpc

Fixes [YOCTO #1276]

As of Linux kernel version 3.0.1, and much earlier, the make clean target
removes arch/powerpc/lib/crtsavres.o. As this object is present in
KBUILD_LDFLAGS_MODULE, it is required to build external modules, and should
therefor not be removed by make clean.

While I do not advocate fixing buggy kernels in the generic kernel classes,
we should probably account for this one in kernel.bbclass as it affects
such a long list of kernel versions.

(From OE-Core rev: 2e83e6755441cb14bd907d306974338c15173189)

Signed-off-by: Darren Hart <dvhart@linux.intel.com>
CC: Bruce Ashfield <bruce.ashfield@windriver.com>
CC: Tom Zanussi <tom.zanussi@intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

1 files changed, 7 insertions, 0 deletions

diff --git a/meta/classes/kernel.bbclass b/meta/classes/kernel.bbclass
index 7dc9cc6e42..386b05e57a 100644
--- a/meta/classes/kernel.bbclass
+++ b/meta/classes/kernel.bbclass
@@ -159,6 +159,13 @@ kernel_do_install() {
         find $kerneldir -path $kerneldir/scripts -prune -o -name "*.[csS]" -exec rm '{}' \;
         find $kerneldir/Documentation -name "*.txt" -exec rm '{}' \;
 
+        # As of Linux kernel version 3.0.1, the clean target removes
+        # arch/powerpc/lib/crtsavres.o which is present in
+        # KBUILD_LDFLAGS_MODULE, making it required to build external modules.
+        if [ ${ARCH} = "powerpc" ]; then
+                cp arch/powerpc/lib/crtsavres.o $kerneldir/arch/powerpc/lib/crtsavres.o
+        fi
+
         # Remove the following binaries which cause strip errors
         # during do_package for cross-compiled platforms
         bin_files="arch/powerpc/boot/addnote arch/powerpc/boot/hack-coff \