5a6c698ea3
r7-912 copied (parts of) the valgrind annotation checks from gcc to libcpp. The above copies the missing pieces to libcpp to diagnose when libcpp is configured with --enable-valgrind-annotations but valgrind is not installed. libcpp/ChangeLog: PR preprocessor/107691 * configure.ac: Add valgrind header checks. * configure: Regenerate.