@@ -513,15 +513,15 @@ append(){

 }

 add_cppflags(){

-    append CPPFLAGS "$@"

+    append CPPFLAGS $($filter_cppflags "$@")

 }

 add_cflags(){

-    append CFLAGS "$@"

+    append CFLAGS $($filter_cflags "$@")

 }

 add_asflags(){

-    append ASFLAGS "$@"

+    append ASFLAGS $($filter_asflags "$@")

 }

 add_ldflags(){

@@ -589,14 +589,16 @@ check_ld(){

 check_cppflags(){

     log check_cppflags "$@"

-    check_cc "$@" <<EOF && add_cppflags "$@"

+    set -- $($filter_cppflags "$@")

+    check_cc "$@" <<EOF && append CPPFLAGS "$@"

 int x;

 EOF

 }

 check_cflags(){

     log check_cflags "$@"

-    check_cc "$@" <<EOF && add_cflags "$@"

+    set -- $($filter_cflags "$@")

+    check_cc "$@" <<EOF && append CFLAGS "$@"

 int x;

 EOF

 }

@@ -1507,6 +1509,10 @@ test -n "$cc_type" && enable $cc_type || echolog "Unknown C compiler $cc"

 : ${ld_default:=$cc}

 set_default as dep_cc ld

+: ${filter_cflags:=echo}

+: ${filter_cppflags:=echo}

+: ${filter_asflags:=echo}

+

 add_cflags $extra_cflags

 add_asflags $extra_cflags