It's because the way how parsePrep() is implemented. First it reads all lines
in %prep section (parsePrep.c:545,555) during this process all macros are
expanded and then it looks for %setup in these read lines (parsePrep.c:557,569)
and if it finds it, function doSetup() is executed. So doSetup() is executed
and macro %buildsubdir is defined after all macros in %prep section are
expanded.
So I think that it behaves as it behaves only because the way how it is
implemented. I don't think that there is some rule that the macro %buildsubdir
shouldn't be defined in %prep section.
Lubos
----- Original Message -----
> From: "Andreas Scherer" <andreas.scherer@xxxxxxxx>
> To: rpm-list@xxxxxxxxxxxxx
> Sent: Sunday, January 31, 2016 10:27:45 AM
> Subject: Timing problem with '%buildsubdir'
>
> -----BEGIN PGP SIGNED MESSAGE-----
> Hash: SHA1
>
> Why is macro '%buildsubdir' not available in section '%prep'?
>
> According to the comment in 'macros[.in]', '%buildsubdir' is "set
> after processing %setup", but there seems to be a timing problem in
> setting and resolving this particular item.
>
> %prep
> %setup -c
> %{echo:<<<PREP:%buildsubdir>>>}
>
> produces "<<<PREP:%buildsubdir>>>, i.e., the macro is _not_ set at
> this point, while a later
>
> %build
> %{echo:<<<BUILD:%buildsubdir>>>}
>
> produces the expected <<<BUILD:sgb-20090810>>>. (Using
> 'https://github.com/ascherer/sgb/blob/local/sgb.spec' as example.)
>
> Internally, 'doSetupMacro()' uses 'spec->buildSubdir' for referencing
> the project building area, and calls 'addMacro(...,"buildsubdir",...)'
> on the way.
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> iEYEARECAAYFAlat05EACgkQpGC+y3YKfI7dJgCfZmS9W7s1MksR2y3ZfXUrjXjS
> B6oAnA21/czC0HvLMO5dQ4Ejj/1e6Z2Y
> =3VC6
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