[Rpm-maint] [rpm-software-management/rpm] Improve description of conditionals + comments in spec documentation (#830)

[Panu Matilainen]

pmatilai commented on this pull request.



> +%elifarch, %elifos or %else can be optionally used. Conditionals %endif and
+%else should not be followed by any text. Conditionals may be nested within
+other conditionals.
+
+Conditionals are not macros. It has an interesting consequence (similar as
+the fact that macros get expanded in comments). If a conditional is a part
+of a definition like
+\verbatim
+	%define macro_with_if \
+	%if 0  \
+	%global output XXX\
+	%endif
+\endverbatim
+the expansion (including %global) occurs before evaluating of the
+conditionals. Thus after the expansion of %macro_with_if macro %output
+is defined to XXX.

I don't think this last block belongs here, at least in this detail. Dark corners are often best left undocumented to allow changing if a saner behavior becomes feasible later. I'd condense that into something like:

%if-conditionals are not macros, and are unlikely to yield expected results if used in them.

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