[Rpm-maint] [rpm-software-management/rpm] Merge buildprocess.md contents into rpmbuild man pages (PR #4047)

[Panu Matilainen]

@pmatilai commented on this pull request.



> +the respective identifier (see also *OPERATIONS*).
+
+Some steps are implemented as standalone scripts whose contents is dumped in the
+*rpmbuild* output for diagnostic purposes. Their names are shown in parentheses
+after the stage identifier (if any), prefixed with *%* if they correspond to a
+spec section or directive.
+
+Binary packages are produced separately for one or more platforms, called _build
+targets_. By default, the current platform is the only build target. This can be
+overridden with *--target* or by declaring a *BuildArch* in the spec. Currently,
+using a *--target* and *BuildArch* that disagree with each other will result in
+undefined behavior.
+
+Note that *BuildArch* causes the spec parsing to recurse from the start, causing
+any macros before that line to be expanded twice. This can yield unexpected
+results, in particular with *%global*.

Perhaps this should go into a BUGS section to make it easier to discover? It's a common gotcha for packagers and something we wont be able to cure.

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