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The grep pattern seems to have been wrong ever since we stopped adding the -ffile-prefix-map via a patch in commit 20aea61385e, because the actual upstream gcc produces -ffile-prefix-map=<old>=<new> and not -ffile-prefix-map=<old=new> Besides, these *-prefix-map options are already used when building the kernel due to the setting of KERNEL_CC, and the kernel build system itself also probes for and uses at least -fmacro-prefix-map (hence taking care of __FILE__ etc., but not necessarily things that go in .debug_info sections). (From OE-Core rev: 5d56de8cd653d2a3a7f4c104d50c14e22d412f66) Signed-off-by: Rasmus Villemoes <rasmus.villemoes@prevas.dk> Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>