powerpc: Only use -mtraceback=no, -mno-string and -msoft-float if toolchain supports it

[cascardo/linux.git] / arch / powerpc / Makefile

diff --git a/arch/powerpc/Makefile b/arch/powerpc/Makefile
index 07a4808..799e67d 100644 (file)
--- a/arch/powerpc/Makefile
+++ b/arch/powerpc/Makefile
@@ -113,7 +113,7 @@ else
 endif
 endif
 
-CFLAGS-$(CONFIG_PPC64) := -mtraceback=no
+CFLAGS-$(CONFIG_PPC64) := $(call cc-option,-mtraceback=no)
 ifeq ($(CONFIG_CPU_LITTLE_ENDIAN),y)
 CFLAGS-$(CONFIG_PPC64) += $(call cc-option,-mabi=elfv2,-mcall-aixdesc)
 AFLAGS-$(CONFIG_PPC64) += $(call cc-option,-mabi=elfv2)
@@ -160,7 +160,8 @@ asinstr := $(call as-instr,lis 9$(comma)foo@high,-DHAVE_AS_ATHIGH=1)
 
 KBUILD_CPPFLAGS        += -Iarch/$(ARCH) $(asinstr)
 KBUILD_AFLAGS  += -Iarch/$(ARCH) $(AFLAGS-y)
-KBUILD_CFLAGS  += -msoft-float -pipe -Iarch/$(ARCH) $(CFLAGS-y)
+KBUILD_CFLAGS  += $(call cc-option,-msoft-float)
+KBUILD_CFLAGS  += -pipe -Iarch/$(ARCH) $(CFLAGS-y)
 CPP            = $(CC) -E $(KBUILD_CFLAGS)
 
 CHECKFLAGS     += -m$(CONFIG_WORD_SIZE) -D__powerpc__ -D__powerpc$(CONFIG_WORD_SIZE)__
@@ -192,7 +193,7 @@ KBUILD_CFLAGS       += $(call cc-option,-fno-dwarf2-cfi-asm)
 
 # Never use string load/store instructions as they are
 # often slow when they are implemented at all
-KBUILD_CFLAGS          += -mno-string
+KBUILD_CFLAGS          += $(call cc-option,-mno-string)
 
 ifeq ($(CONFIG_6xx),y)
 KBUILD_CFLAGS          += -mcpu=powerpc
@@ -269,6 +270,21 @@ bootwrapper_install:
 %.dtb: scripts
        $(Q)$(MAKE) ARCH=ppc64 $(build)=$(boot) $(patsubst %,$(boot)/%,$@)
 
+# Used to create 'merged defconfigs'
+# To use it $(call) it with the first argument as the base defconfig
+# and the second argument as a space separated list of .config files to merge,
+# without the .config suffix.
+define merge_into_defconfig
+       $(Q)$(CONFIG_SHELL) $(srctree)/scripts/kconfig/merge_config.sh \
+               -m -O $(objtree) $(srctree)/arch/$(ARCH)/configs/$(1) \
+               $(foreach config,$(2),$(srctree)/arch/$(ARCH)/configs/$(config).config)
+       +$(Q)$(MAKE) -f $(srctree)/Makefile olddefconfig
+endef
+
+PHONY += pseries_le_defconfig
+pseries_le_defconfig:
+       $(call merge_into_defconfig,pseries_defconfig,le)
+
 define archhelp
   @echo '* zImage          - Build default images selected by kernel config'
   @echo '  zImage.*        - Compressed kernel image (arch/$(ARCH)/boot/zImage.*)'
@@ -314,7 +330,8 @@ TOUT        := .tmp_gas_check
 # - Require gcc 4.0 or above on 64-bit
 # - gcc-4.2.0 has issues compiling modules on 64-bit
 checkbin:
-       @if test "$(cc-version)" = "0304" ; then \
+       @if test "${COMPILER}" != "clang" \
+           && test "$(cc-version)" = "0304" ; then \
                if ! /bin/echo mftb 5 | $(AS) -v -mppc -many -o $(TOUT) >/dev/null 2>&1 ; then \
                        echo -n '*** ${VERSION}.${PATCHLEVEL} kernels no longer build '; \
                        echo 'correctly with gcc-3.4 and your version of binutils.'; \
@@ -322,13 +339,15 @@ checkbin:
                        false; \
                fi ; \
        fi
-       @if test "$(cc-version)" -lt "0400" \
+       @if test "${COMPILER}" != "clang" \
+           && test "$(cc-version)" -lt "0400" \
            && test "x${CONFIG_PPC64}" = "xy" ; then \
                 echo -n "Sorry, GCC v4.0 or above is required to build " ; \
                 echo "the 64-bit powerpc kernel." ; \
                 false ; \
         fi
-       @if test "$(cc-fullversion)" = "040200" \
+       @if test "${COMPILER}" != "clang" \
+           && test "$(cc-fullversion)" = "040200" \
            && test "x${CONFIG_MODULES}${CONFIG_PPC64}" = "xyy" ; then \
                echo -n '*** GCC-4.2.0 cannot compile the 64-bit powerpc ' ; \
                echo 'kernel with modules enabled.' ; \
@@ -336,6 +355,14 @@ checkbin:
                echo 'disable kernel modules' ; \
                false ; \
        fi
+       @if test "x${CONFIG_CPU_LITTLE_ENDIAN}" = "xy" \
+           && $(LD) --version | head -1 | grep ' 2\.24$$' >/dev/null ; then \
+               echo -n '*** binutils 2.24 miscompiles weak symbols ' ; \
+               echo 'in some circumstances.' ; \
+               echo -n '*** Please use a different binutils version.' ; \
+               false ; \
+       fi
+
 
 CLEAN_FILES += $(TOUT)