[PATCH v5] Makefile: Add build time and compiler info string

[Andreas Schwab]

On Okt 18 2021, Anup Patel wrote:

> Users will have to figure-out/remember a fixed build date when
> using SOURCE_DATA_EPOCH for reproducible builds whereas
> users don't need to do anything when BUILD_INFO is not defined.

Users who care about reproducible builds already know how to set
SOURCE_DATA_EPOCH.

Andreas.

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Andreas Schwab, schwab at linux-m68k.org
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