[Rpm-maint] [rpm-software-management/rpm] Proof-of-concept native support for vpath-style builds (PR #2886)

[Panu Matilainen]

Add a new %setup switch -s to indicate building in a directory outside the source directory, known as vpath build in some circles. Add a new %{sourcesubdir} macro which by default equals %{buildsubdir}, but when -s is used, we create and switch to a separate directory after unpacking.

A one gotcha here is that special %doc and %license has traditionally worked for both built and pre-existing content. With build and source trees separated, both cannot work. As special %doc/%license is mostly used for things like README's and COPYING which come as part of the source, we define %doc on vpath builds to mean source directory, and assume built content has its own means of installing (eg make install-doc).

Another potential issue is that we redefine %_configure to an absolute path in the sourcesubdir, this would break some unusual cases where %configure is used to invoke a configure-script outside the project top directory. It's mainly redefined here to make testing -s on an autotools project easy, a final implementation might do something else.
You can view, comment on, or merge this pull request online at:

  https://github.com/rpm-software-management/rpm/pull/2886

-- Commit Summary --

  * Introduce an rpm-controlled per-build directory
  * Make buildroot fully rpm controlled, always inside the per-build directory
  * Move SPECPARTS to per-pkg builddir, no longer needing name-version
  * PoC: Add native support for vpath-style builds outside the source tree

-- File Changes --

    M build/build.c (38)
    M build/files.c (2)
    M build/parsePreamble.c (30)
    M build/parsePrep.c (20)
    M build/parseSpec.c (15)
    M build/rpmbuild_internal.h (1)
    M build/spec.c (4)
    M include/rpm/rpmbuild.h (3)
    M macros.in (22)
    M tests/rpmbuild.at (46)
    M tests/rpmspec.at (8)
    M tools/rpmbuild.c (18)

-- Patch Links --

https://github.com/rpm-software-management/rpm/pull/2886.patch
https://github.com/rpm-software-management/rpm/pull/2886.diff

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