nonclangable: elfuitls: add unused-const-variable fix

Signed-off-by: Jose Quaresma <[email protected]>

conf/nonclangable.conf

@@ -20,6 +20,8 @@ TOOLCHAIN:pn-grub:aarch64 = "gcc"
 TOOLCHAIN:pn-crash = "gcc"
 # See https://github.com/llvm/llvm-project/issues/71925
 LIBCPLUSPLUS:pn-elfutils:toolchain-clang = "-stdlib=libstdc++"
+# Remove it once https://lore.kernel.org/openembedded-core/[email protected]/T/#u is merged
+CXXFLAGS:append:pn-elfutils:toolchain-clang = " -Wno-error=unused-const-variable"
 #| erl_bits.c:(.text+0xc2a): undefined reference to `__extendhfsf2'
 #| erl_bits.c:(.text+0x1bfa): undefined reference to `__truncsfhf2'
 #| clang-15: error: linker command failed with exit code 1 (use -v to see invocation)