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configure: add --extra-cxxflags option

same usage as --extra-cflags

Change-Id: Iff2ed7b8ebb6e51610ee0851aeec08413367ab23

--- a/build/make/configure.sh

+++ b/build/make/configure.sh

@@ -73,6 +73,7 @@

   --target=TARGET             target platform tuple [generic-gnu]

   --cpu=CPU                   optimize for a specific cpu rather than a family

   --extra-cflags=ECFLAGS      add ECFLAGS to CFLAGS [$CFLAGS]

+  --extra-cxxflags=ECXXFLAGS  add ECXXFLAGS to CXXFLAGS [$CXXFLAGS]

   ${toggle_extra_warnings}    emit harmless warnings (always non-fatal)

   ${toggle_werror}            treat warnings as errors, if possible

                               (not available with all compilers)

@@ -337,6 +338,10 @@

   check_cflags "$@" && add_cflags_only "$@"

 }

+check_add_cxxflags() {

+  check_cxxflags "$@" && add_cxxflags_only "$@"

+}

+

 check_add_asflags() {

   log add_asflags "$@"

   add_asflags "$@"

@@ -502,6 +507,9 @@

         ;;

       --extra-cflags=*)

         extra_cflags="${optval}"

+        ;;

+      --extra-cxxflags=*)

+        extra_cxxflags="${optval}"

         ;;

       --enable-?*|--disable-?*)

         eval `echo "$opt" | sed 's/--/action=/;s/-/ option=/;s/-/_/g'`

--- a/configure

+++ b/configure

@@ -723,6 +723,10 @@

         check_add_cflags ${extra_cflags} || \

         die "Requested extra CFLAGS '${extra_cflags}' not supported by compiler"

     fi

+    if [ -n "${extra_cxxflags}" ]; then

+        check_add_cxxflags ${extra_cxxflags} || \

+        die "Requested extra CXXFLAGS '${extra_cxxflags}' not supported by compiler"

+    fi

 }