workaround OOM on armv7 builders (#2021376)

openvdb.spec

@@ -41,11 +41,6 @@ BuildRequires:  pkgconfig(tbb) >= 3.0
 BuildRequires:  pkgconfig(xi)
 BuildRequires:  pkgconfig(zlib) > 1.2.7
 
-# Temporarily exclude armv7hl support due to
-# exhausted virtual memory
-# https://bugzilla.redhat.com/show_bug.cgi?id=2021376
-ExcludeArch:    armv7hl
-
 
 %description
 OpenVDB is an Academy Award-winning open-source C++ library comprising a novel
@@ -105,7 +100,11 @@ sed -i \
 
 
 %build
-export CXXFLAGS="%{optflags} -Wl,--as-needed"
+%ifarch %{arm}
+# https://bugzilla.redhat.com/show_bug.cgi?id=2021376
+%global optflags %(echo %{optflags} | sed 's/-g /-g1 /')
+%endif
+export CXXFLAGS="%{build_cxxflags} -Wl,--as-needed"
 
 # Ignore versions (python 3, etc.)
 %cmake \