scripts: check for, and warn about an unset CT_PREFIX_DIR
The user shall provide a directory to install the toolchain into.
If he/she does not, this is an error, and shall be detected properly,
rather than relying on failure down the road.
Thanks to "Pedro I. Sanchez" <psanchez@colcan.ca> for pointing out
the issue:
http://sourceware.org/ml/crossgcc/2009-12/msg00011.html
1 # Super-H specific configuration file
2 # depends on EXPERIMENTAL
6 select ARCH_SUPPORTS_BOTH_ENDIAN
9 The Super-H architecture, as defined by:
10 http://www.renesas.com/fmwk.jsp?cnt=superh_family_landing.jsp&fp=/products/mpumcu/superh_family/
30 config ARCH_SH_VARIANT
32 default "sh3" if ARCH_SH_SH3
33 default "sh4" if ARCH_SH_SH4
34 default "sh4a" if ARCH_SH_SH4A