%configure assuming in-source-tree builds

[Michel Salim]

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Hi all,

Some upstream developers recommend that their software (thinking of LLVM
and PLT Scheme, but there must be others) *not* be configured and built
at the top-level source directory (typically recommending using build/,
object/ or some such).

When this is needed, currently the Fedora packager has to revert to
calling the configure script directly, foregoing the %configure macro,
and copying as much of the configure settings by hand. Would it be a
desirable feature to, say, be able to declare

%define configure_relative_path ..

and then have %configure use the value of that instead of './' when
calling the actual configure script?

Thanks,

- --
Michel
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