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silence c++ abi warning

Linking c++ libraries built with gcc 6 and gcc 7 on arm
generates some warnings because of incompatibilities between those
compilers:
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=77728

libvpx does not generate a c++ library. C++ is only used for examples and tests.

Change-Id: I3d5d5ef3fb66743bff26a833d6641898975e9f71

--- a/configure

+++ b/configure

@@ -634,6 +634,12 @@

         # Avoid this warning for third_party C++ sources. Some reorganization

         # would be needed to apply this only to test/*.cc.

         check_cflags -Wshorten-64-to-32 && add_cflags_only -Wshorten-64-to-32

+

+        # Quiet gcc 6 vs 7 abi warnings:

+        # https://gcc.gnu.org/bugzilla/show_bug.cgi?id=77728

+        if enabled arm; then

+          check_add_cxxflags -Wno-psabi

+        fi

     fi

     if enabled icc; then