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authorKevin Hao <haokexin@gmail.com>2015-01-15 12:07:33 +0000
committerCatalin Marinas <catalin.marinas@arm.com>2015-01-15 15:52:21 +0000
commitd67703a8a69eecc8367bb9f848640b9efd430337 (patch)
treeae63f78378941268b3001d763f5ec7cde078e040 /arch/arm64/Makefile
parent0ce339a9e60d417e2747ff7c4869d9691a606e49 (diff)
downloadlinux-d67703a8a69eecc8367bb9f848640b9efd430337.tar.gz
arm64: kill off the libgcc dependency
The arm64 kernel builds fine without the libgcc. Actually it should not be used at all in the kernel. The following are the reasons indicated by Russell King: Although libgcc is part of the compiler, libgcc is built with the expectation that it will be running in userland - it expects to link to a libc. That's why you can't build libgcc without having the glibc headers around. [...] Meanwhile, having the kernel build the compiler support functions that it needs ensures that (a) we know what compiler support functions are being used, (b) we know the implementation of those support functions are sane for use in the kernel, (c) we can build them with appropriate compiler flags for best performance, and (d) we remove an unnecessary dependency on the build toolchain. Signed-off-by: Kevin Hao <haokexin@gmail.com> Acked-by: Will Deacon <will.deacon@arm.com> Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
Diffstat (limited to 'arch/arm64/Makefile')
-rw-r--r--arch/arm64/Makefile3
1 files changed, 0 insertions, 3 deletions
diff --git a/arch/arm64/Makefile b/arch/arm64/Makefile
index 1c43cec971b5..a20c28348be4 100644
--- a/arch/arm64/Makefile
+++ b/arch/arm64/Makefile
@@ -15,8 +15,6 @@ CPPFLAGS_vmlinux.lds = -DTEXT_OFFSET=$(TEXT_OFFSET)
OBJCOPYFLAGS :=-O binary -R .note -R .note.gnu.build-id -R .comment -S
GZFLAGS :=-9
-LIBGCC := $(shell $(CC) $(KBUILD_CFLAGS) -print-libgcc-file-name)
-
KBUILD_DEFCONFIG := defconfig
KBUILD_CFLAGS += -mgeneral-regs-only
@@ -50,7 +48,6 @@ core-$(CONFIG_KVM) += arch/arm64/kvm/
core-$(CONFIG_XEN) += arch/arm64/xen/
core-$(CONFIG_CRYPTO) += arch/arm64/crypto/
libs-y := arch/arm64/lib/ $(libs-y)
-libs-y += $(LIBGCC)
libs-$(CONFIG_EFI_STUB) += drivers/firmware/efi/libstub/
# Default target when executing plain make