setting -fdebug-prefix-map via envvar

[Bill Allombert]

Hello,

Is it possible to set -fdebug-prefix-map via an environment variable or
a similar mechanism rather than through the command line ?

The issue is that adding -fdebug-prefix-map=PREFIX to CFLAGS
leads to PREFIX leaking in buildlogs and in generated Makefiles and 
similar files that can end up inside packages, making previously
reproducible packages unreproducible.

Cheers,
-- 
Bill. <ballombe at debian.org>

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