[Rpm-maint] [rpm-software-management/rpm] [RFE] Provide install time alternative to `%{?_isa}` (#1344)

[Vít Ondruch]

So would be macro like this acceptable for upstream RPM?

~~~
# %%Requires - Require library with right bitness.
#
# Usage: %%Requires [options] <library>
#
# There is no way to know the installation architecture of noarch package 
# during buildtime. Therefore this macro allows to require the specified
# <library> with the right bitness of the target platform. By default,
# the bitness is derived from glic.
#
# -r <reference_library>   Reference library used to determine bitness.
#
%global Requires(r:) \
%%{?2:%%{error:%%%%Requires macro requires one argument}} \
Requires: (%%{1}()(64bit) if %%{!?-r:libc.so.6}%%{-r*}()(64bit)) \
Requires: (%%{1} if %%{!?-r:libc.so.6}%%{-r*}) \
%{nil}
~~~

Or should I propose it for Fedora?

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