It is not possible to pass extra linker options via BR2_TARGET_LDFLAGS if such options contain a $ sign. For example, the following is known to break: BR2_TARGET_LDFLAGS="-Wl,-rpath=\'$ORIGIN/../lib'"

The libffi package is not supported on the SuperH 2 and ARMv7-M architectures.

The prboom package triggers a compiler failure with the SuperH 4 compiler from Sourcery CodeBench, version 2012.09.