@dmnks commented on this pull request.
> +Spec parts cannot include preamble tags or directives that are needed for, or
+influence, the build process. This includes all build scriptlets, sources and
+patches, *BuildRequires*, *BuildArch* (except for *noarch* sub-packages),
+*BuildSystem*, *ExcludeArch*, *ExclusiveArch*, *ExcludeOS* and *ExclusiveOS*.
+These will terminate the build with an error if encountered in a spec part.
+Declaring macros meant to be used in build scriptlets is not an error, however
+they will not influence the build for obvious reasons.
+
+Generally, _.specpart_ files should be generated by separate executables
invoked
+from build scriptlets rather than by the scriptlets directly. This is to ensure
+that the spec syntax written to such files is not interpreted prematurely (that
+is, when the spec file is read) as that could have an unintended side effect on
+the build process. Spec directives starting at the beginning of the line should
+thus be avoided entirely as they would be interpreted right away.
+
+*$RPM_SPECPARTS_DIR* is created automatically at the start of the build, and
The exact build stage (as documented in the `rpmbuild(1)` manual) is not that
important in this context (and not even mentioned in the `rpm-spec(5)` manual
at all) so let's keep it as-is.
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