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As of the 4.13 kernel, there are configuration + linker combinations
that do not need (or build) crtsavres.o for ppc64 targets. The commit
of interest is:
commit efe0160cfd40a99c052a00e174787c1f4158a9cd
Author: Nicholas Piggin <npiggin@gmail.com>
Date: Fri May 12 01:56:52 2017 +1000
powerpc/64: Linker on-demand sfpr functions for modules
For final link, the powerpc64 linker generates fpr save/restore
functions on-demand, placing them in the .sfpr section. Starting with
binutils 2.25, these can be provided for non-final links with
--save-restore-funcs. Use that where possible for module links.
This saves about 200 bytes per module (~60kB) on powernv defconfig
build.
Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
As such, our arch test for crtsavres.o is not enough, we add a secondary
existence check before trying the copy.
[YOCTO #12576]
(From OE-Core rev: af58819253a2d4526dc8871a17e1492bd1d92951)
Signed-off-by: Bruce Ashfield <bruce.ashfield@windriver.com>
Signed-off-by: Ross Burton <ross.burton@intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
QEMU Emulation Targets ====================== To simplify development, the build system supports building images to work with the QEMU emulator in system emulation mode. Several architectures are currently supported in 32 and 64 bit variants: * ARM (qemuarm + qemuarm64) * x86 (qemux86 + qemux86-64) * PowerPC (qemuppc only) * MIPS (qemumips + qemumips64) Use of the QEMU images is covered in the Yocto Project Reference Manual. The appropriate MACHINE variable value corresponding to the target is given in brackets.