Fwd: Incorrect thinlto cache directory path in Makefile

[Bagas Sanjaya]

Hi,

Xu Zhen <xuzhen@xxxxxxxxxxxx> reported on Bugzilla (https://bugzilla.kernel.org/show_bug.cgi?id=218825) thinlto build directory problem (especially on
DKMS modules). He wrote:

> In Makefile, the ld flag `--thinlto-cache-dir' is set to
> `$(extmod_prefix).thinlto-cache'. But at that time, the variable extmod_prefix
> had not been assigned yet. Therefore, the thinlto cache dir is always created
> in the current directory.
> 
> Even worse, the cache dir cannot be deleted when executing `make clean'. This
> is because its path was written as `$(KBUILD_EXTMOD)/.thinlto-cache' in the
> clean: target.
> 
> Some users have been troubled by it: https://github.com/dell/dkms/issues/292
> 
> This bug was introduced by commit dc5723b02e523b2c4a68667f7e28c65018f7202f

Thanks.

-- 
An old man doll... just what I always wanted! - Clara

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