optflags is currently not being used for C++ compiles.  I think it should.

/usr/lib/rpm/macros currently reads:

%configure      \
  %{?__libtoolize:[ -f configure.in ] && %{__libtoolize} --copy --force} \
  CFLAGS="%{optflags}" ./configure %{_target_platform} --prefix=%{_prefix}


The problem is that automake does NOT use CFLAGS in the default rule for
C++ compiles, it uses CXXFLAGS.  I suggest that %configure should be
changed to read as follows:

%configure      \
  %{?__libtoolize:[ -f configure.in ] && %{__libtoolize} --copy --force} \
  CFLAGS="%{optflags}" CXXFLAGS="%{optflags}" \
  ./configure %{_target_platform} --prefix=%{_prefix}