fanquake e507acb118 Merge #20353: configure: Support -fdebug-prefix-map and -fmacro-prefix-map ...

7abac98d3e configure: Support -f{debug,macro}-prefix-map (Anthony Towns)

Pull request description:

  When bitcoin is checked out in two directories (eg via git worktree) object files between the two will differ due to the full path being included in the debug section. `-fdebug-prefix-map` is used to replace this with "." to avoid this unnecessary difference and allow ccache to share objects between worktrees (provided the source and compile options are the same).

  Also provide `-fmacro-prefix-map` if supported so that the working dir is not encoded in `__FILE__` macros.

ACKs for top commit:
  practicalswift:
    cr ACK 7abac98d3e: patch looks correct
  fanquake:
    ACK 7abac98d3e

Tree-SHA512: b6a37c1728ec3b2e552f244da0e66db113c1e7662c7ac502e12ff466f3dbfbfefae12695ca135137c50dbb1c4c5d84059116c0cd09b391a17466dc77b8726679

2021-04-21 13:26:49 +08:00

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