This bug appears to have been reported against 'rawhide' during the Fedora 28 development cycle.
Changing version to '28'.

ping?

Here is a simple patch to do it.

But I don't know how to request commit access to the rpms/dwz project to push it. Is there some way to request group access on src.fedoraproject.org for a specific srpm?

diff --git a/dwz.spec b/dwz.spec
index fdbd42b..985481e 100644
--- a/dwz.spec
+++ b/dwz.spec
@@ -1,14 +1,14 @@
 Summary: DWARF optimization and duplicate removal tool
 Name: dwz
 Version: 0.12
-Release: 7%{?dist}
+Release: 8%{?dist}
 License: GPLv2+ and GPLv3+
 Group: Development/Tools
 # git archive --format=tar --remote=git://sourceware.org/git/dwz.git \
 #   --prefix=%{name}-%{version}/ %{name}-%{version} \
 #   | bzip2 -9 > %{name}-%{version}.tar.bz2
 Source: %{name}-%{version}.tar.bz2
-BuildRequires: elfutils-libelf-devel%{?_isa}
+BuildRequires: elfutils-libelf-devel
 
 %description
 The dwz package contains a program that attempts to optimize DWARF
@@ -23,7 +23,7 @@ and using DW_TAG_imported_unit to import it into each CU that needs it.
 %setup -q
 
 %build
-make %{?_smp_mflags} CFLAGS='%{optflags}' LDFLAGS='%{build_ldflags}' \
+make %{?_smp_mflags} CFLAGS="$RPM_OPT_FLAGS" LDFLAGS="$RPM_LD_FLAGS" \
   prefix=%{_prefix} mandir=%{_mandir} bindir=%{_bindir}
 
 %install
@@ -38,6 +38,11 @@ make DESTDIR=%{buildroot} prefix=%{_prefix} mandir=%{_mandir} bindir=%{_bindir}
 %{_mandir}/man1/dwz.1*
 
 %changelog
+* Mon Jul 02 2018 Mark Wielaard <mjw> - 0.12-8
+- Remove %%{?_isa} from BuildRequires (#1545173)
+- Use RPM_OPT_FLAGS and RPM_LD_FLAGS instead of
+  %%{optflags} and %%{build_ldflags}.
+
 * Fri Feb 23 2018 Florian Weimer <fweimer> - 0.12-7
 - Use LDFLAGS from redhat-rpm-config

Marek pushed a fix.

The needinfo request[s] on this closed bug have been removed as they have been unresolved for 1000 days