powerpc: Add option to use thin archives (43c9127d) · Commits · 戴 / test

Add an option to use thin archives to build the kernel. Thin archives are explained in commit ("kbuild: allow architectures to use thin archives instead of ld -r"). This is a gradual way to introduce the option to testers. Some change to the way we invoke ar is required so it can be used by scripts/link-vmlinux.sh. Signed-off-by:

Stephen Rothwell <sfr@canb.auug.org.au> Signed-off-by:

Nicholas Piggin <npiggin@gmail.com> [mpe: Make it an explicit option not dependant on COMPILE_TEST] Signed-off-by:

Michael Ellerman <mpe@ellerman.id.au>

arch/powerpc/Kconfig

+8 −0

Original line number	Diff line number	Diff line
		@@ -396,6 +396,14 @@ config MPROFILE_KERNEL
		depends on PPC64 && CPU_LITTLE_ENDIAN
		def_bool !DISABLE_MPROFILE_KERNEL

		config USE_THIN_ARCHIVES
		bool "Build the kernel using thin archives"
		default n
		select THIN_ARCHIVES
		help
		Build the kernel using thin archives.
		If you're unsure say N.

		config IOMMU_HELPER
		def_bool PPC64

arch/powerpc/Makefile

+2 −2

Original line number	Diff line number	Diff line
		@@ -23,7 +23,7 @@ CROSS32AR := $(CROSS32_COMPILE)ar
		ifeq ($(HAS_BIARCH),y)
		ifeq ($(CROSS32_COMPILE),)
		CROSS32CC := $(CC) -m32
		CROSS32AR := GNUTARGET=elf32-powerpc $(AR)
		KBUILD_ARFLAGS += --target=elf32-powerpc
		endif
		endif

		@@ -85,7 +85,7 @@ ifeq ($(HAS_BIARCH),y)
		override AS += -a$(BITS)
		override LD += -m elf$(BITS)$(LDEMULATION)
		override CC += -m$(BITS)
		override AR := GNUTARGET=elf$(BITS)-$(GNUTARGET) $(AR)
		KBUILD_ARFLAGS += --target=elf$(BITS)-$(GNUTARGET)
		endif

		LDFLAGS_vmlinux-y := -Bstatic

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