[Buildroot] [PATCH] toolchain/toolchain-wrapper: let recent GCC handle SOURCE_DATE_EPOCH

[Peter Korsgaard]

>>>>> "John" == John Keeping <john at metanate.com> writes:

 > When using precompiled headers, changing any macros defined on the
 > command line will invalidate the precompiled header.  With
 > toolchain-wrapper adding __DATE__ and __TIME__, any commits to Buildroot
 > will invalidate incremental builds regardless of whether the precompiled
 > header actually uses those values (affecting _OVERRIDE_SRCDIR).

 > GCC-7 and later support SOURCE_DATE_EPOCH and use it to define __DATE__
 > and __TIME__ internally, avoiding any impact on precompiled headers.

 > Disable the custom handling in toolchain-wrapper if GCC is version 7 or
 > newer.

 > Signed-off-by: John Keeping <john at metanate.com>

Seems pretty safe to add, so:

Committed to 2020.02.x and 2020.05.x, thanks.

-- 
Bye, Peter Korsgaard