Once we stop stripping static libraries in rpmbuild (bug 1395280), we no longer have to put a copy of the unstripped library into the debuginfo file.
This bug appears to have been reported against 'rawhide' during the Fedora 26 development cycle. Changing version to '26'.
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If we ship libc.a in glibc-static with debugging information, then static linking without the -s option would produce binaries with debugging information, even if -g is not specified. There is concern that this would be too confusing to users.