kbuild: use -fmacro-prefix-map to make __FILE__ a relative path

[linux-2.6-block.git] / Makefile

diff --git a/Makefile b/Makefile
index b259dd64ce95c6539bdf5166cefe14cf2e152ba2..74567b0ec2f081fec5ac68860520dcb4fcf53201 100644 (file)
--- a/Makefile
+++ b/Makefile
@@ -846,6 +846,9 @@ KBUILD_CFLAGS   += $(call cc-option,-Werror=incompatible-pointer-types)
 # Require designated initializers for all marked structures
 KBUILD_CFLAGS   += $(call cc-option,-Werror=designated-init)
 
+# change __FILE__ to the relative path from the srctree
+KBUILD_CFLAGS  += $(call cc-option,-fmacro-prefix-map=$(srctree)/=)
+
 # use the deterministic mode of AR if available
 KBUILD_ARFLAGS := $(call ar-option,D)