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Since gdb 9.x, gdb can optionally use the xxhash library. Since we currently don't do anything about it, it's a potential "silent" dependency. In particular, for host-gdb, this means host-gdb might end up being linked with the system-provided xxhash library if available. This patch handles this dependency: - For the target package, by looking at the value of BR2_PACKAGE_XXHASH - For the host package, by looking at the value of a newly introduced BR2_PACKAGE_HOST_GDB_XXHASH Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com> Signed-off-by: Peter Korsgaard <peter@korsgaard.com>