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authorVineet Gupta <vgupta@synopsys.com>2013-05-25 12:33:25 +0400
committerVineet Gupta <vgupta@synopsys.com>2013-06-27 13:05:32 +0400
commit5a45da02cf040ae7eacc9da10f6e8e369a220863 (patch)
tree27e52dc1a1eda9c3508764bf0f3fcb5a085f43a5 /arch/arc/Makefile
parent05b016ecf5e7a8c24409d8e9effb5d2ec9107708 (diff)
downloadlinux-5a45da02cf040ae7eacc9da10f6e8e369a220863.tar.xz
ARC: Adjustments for gcc 4.8
* DWARF unwinder related + Force DWARF2 compliant .debug_frame (gcc 4.8 defaults to DWARF4 which kernel unwinder can't grok). + Discard the additional .eh_frame generated + Discard the dwarf4 debug info generated by -gdwarf-2 for normal no debug case * 4.8 already uses arc600 multilibs for -mno-mpy * switch to using uclibc compiler (to get -mmedium-calls and -mno-sdata) and also since buildroot can only use 1 toolchain Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
Diffstat (limited to 'arch/arc/Makefile')
-rw-r--r--arch/arc/Makefile24
1 files changed, 16 insertions, 8 deletions
diff --git a/arch/arc/Makefile b/arch/arc/Makefile
index fbc1b84e31f9..8c0b1aa56f7e 100644
--- a/arch/arc/Makefile
+++ b/arch/arc/Makefile
@@ -9,7 +9,7 @@
UTS_MACHINE := arc
ifeq ($(CROSS_COMPILE),)
-CROSS_COMPILE := arc-elf32-
+CROSS_COMPILE := arc-linux-uclibc-
endif
KBUILD_DEFCONFIG := fpga_defconfig
@@ -25,7 +25,11 @@ ifdef CONFIG_ARC_CURR_IN_REG
LINUXINCLUDE += -include ${src}/arch/arc/include/asm/current.h
endif
-atleast_gcc44 := $(call cc-ifversion, -gt, 0402, y)
+upto_gcc42 := $(call cc-ifversion, -le, 0402, y)
+upto_gcc44 := $(call cc-ifversion, -le, 0404, y)
+atleast_gcc44 := $(call cc-ifversion, -ge, 0404, y)
+atleast_gcc48 := $(call cc-ifversion, -ge, 0408, y)
+
cflags-$(atleast_gcc44) += -fsection-anchors
cflags-$(CONFIG_ARC_HAS_LLSC) += -mlock
@@ -33,6 +37,11 @@ cflags-$(CONFIG_ARC_HAS_SWAPE) += -mswape
cflags-$(CONFIG_ARC_HAS_RTSC) += -mrtsc
cflags-$(CONFIG_ARC_DW2_UNWIND) += -fasynchronous-unwind-tables
+# By default gcc 4.8 generates dwarf4 which kernel unwinder can't grok
+ifeq ($(atleast_gcc48),y)
+cflags-$(CONFIG_ARC_DW2_UNWIND) += -gdwarf-2
+endif
+
ifndef CONFIG_CC_OPTIMIZE_FOR_SIZE
# Generic build system uses -O2, we want -O3
cflags-y += -O3
@@ -46,11 +55,10 @@ cflags-$(disable_small_data) += -mno-sdata -fcall-used-gp
cflags-$(CONFIG_CPU_BIG_ENDIAN) += -mbig-endian
ldflags-$(CONFIG_CPU_BIG_ENDIAN) += -EB
-# STAR 9000518362:
+# STAR 9000518362: (fixed with binutils shipping with gcc 4.8)
# arc-linux-uclibc-ld (buildroot) or arceb-elf32-ld (EZChip) don't accept
-# --build-id w/o "-marclinux".
-# Default arc-elf32-ld is OK
-ldflags-y += -marclinux
+# --build-id w/o "-marclinux". Default arc-elf32-ld is OK
+ldflags-$(upto_gcc44) += -marclinux
ARC_LIBGCC := -mA7
cflags-$(CONFIG_ARC_HAS_HW_MPY) += -multcost=16
@@ -64,8 +72,8 @@ ifndef CONFIG_ARC_HAS_HW_MPY
# With gcc 4.4.7, -mno-mpy is enough to make any other related adjustments,
# e.g. increased cost of MPY. With gcc 4.2.1 this had to be explicitly hinted
- ARC_LIBGCC := -marc600
- ifneq ($(atleast_gcc44),y)
+ ifeq ($(upto_gcc42),y)
+ ARC_LIBGCC := -marc600
cflags-y += -multcost=30
endif
endif