1 files changed, 20 insertions, 3 deletions

diff --git a/arch/mips/Makefile b/arch/mips/Makefile
index d5d5831b6e24..4337c492ed1b 100644
--- a/arch/mips/Makefile
+++ b/arch/mips/Makefile
@@ -60,9 +60,6 @@ vmlinux-32		= vmlinux.32
 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 @@ else
 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)"