shithub: libvpx

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Enable -Wundef by default

BUG=webm:1069

Change-Id: I43728f9fd007542718a55d5fdcbc63a8d2f86682

--- a/configure

+++ b/configure

@@ -574,6 +574,9 @@

         check_add_cflags -Wimplicit-function-declaration

         check_add_cflags -Wuninitialized

         check_add_cflags -Wunused

+        # check_add_cflags also adds to cxxflags. gtest does not do well with

+        # -Wundef so add it explicitly to CFLAGS only.

+        check_cflags -Wundef && add_cflags_only -Wundef

         case ${CC} in

           *clang*)

               # libvpx and/or clang have issues with aliasing: