[MIPS] Automatically set CONFIG_BUILD_ELF64
We do not rely on user anymore to setup this config correctly.
Instead we make our choice depending on the load address.
If we want to force Kbuild to use ELF64 format whatever
the load address we can still do:
$ make BUILD_ELF32=no
Signed-off-by: Franck Bui-Huu <fbuihuu@gmail.com>
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
diff --git a/arch/mips/Makefile b/arch/mips/Makefile
index d5d5831..4337c49 100644
--- a/arch/mips/Makefile
+++ b/arch/mips/Makefile
@@ -60,9 +60,6 @@
vmlinux-64 = vmlinux
cflags-y += -mabi=64
-ifndef CONFIG_BUILD_ELF64
-cflags-y += $(call cc-option,-msym32)
-endif
endif
all-$(CONFIG_BOOT_ELF32) := $(vmlinux-32)
@@ -576,6 +573,26 @@
JIFFIES = jiffies_64
endif
+#
+# Automatically detect the build format. By default we choose
+# the elf format according to the load address.
+# We can always force a build with a 64-bits symbol format by
+# passing 'BUILD_ELF32=no' option to the make's command line.
+#
+ifdef CONFIG_64BIT
+ ifndef BUILD_ELF32
+ ifeq ($(shell expr $(load-y) \< 0xffffffff80000000), 0)
+ BUILD_ELF32 = y
+ endif
+ endif
+
+ ifeq ($(BUILD_ELF32), y)
+ cflags-y += -msym32
+ else
+ cflags-y += -DCONFIG_BUILD_ELF64
+ endif
+endif
+
AFLAGS += $(cflags-y)
CFLAGS += $(cflags-y) \
-D"VMLINUX_LOAD_ADDRESS=$(load-y)"