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AS_VAR_SET_DIRNAME and AS_VAR_SET_BASENAME. * doc/autoconf.texi (Programming in M4sh): Document this. All uses changed. The newer interfaces are more reliable, as they allow implementations that handle trailing newline correctly. For now, we're in a freeze, so I did not include the more-reliable implementations, but I wanted to correct the interface before 2.60 goes out. * lib/m4sugar/m4sh.m4 (_AS_DETECT_REQUIRED): Renamed from AS_DETECT_REQUIRED. All uses changed. (_AS_DETECT_SUGGESTED): Renamed from AS_DETECT_SUGGESTED. All uses changed. (_AS_DETECT_BETTER_SHELL): Put ;; at the end of a case. (_AS_BASENAME): Renamed from AS_BASENAME. All uses changed. Use "basename --" to protect against leading "-". (_AS_BASENAME_EXPR): Renamed from AS_BASENAME_EXPR. All uses changed. (_AS_BASENAME_SED): Renamed from AS_BASENAME_SED. All uses changed. (_AS_BASENAME_PREPARE): Reject implementations that cannot handle "--". (_AS_DIRNAME_PREPARE): Likewise. (_AS_DIRNAME): Renamed from AS_DIRNAME. All uses changed. (_AS_DIRNAME_EXPR): Renamed from AS_DIRNAME_EXPR. All uses changed. (_AS_DIRNAME_SED): Renamed from AS_DIRNAME_SED. All uses changed. Use "dirname --". (AS_VAR_SET_BASENAME, AS_VAR_SET_DIRNAME): New macros. * tests/m4sh.at (AS_VAR_SET_DIRNAME): Renamed from AS_DIRNAME. Test the new API. Don't test internals, since they're probably going to change anyway. (AS_VAR_SET_BASENAME): Likewise, renamed from AS_BASENAME. * bin/autoconf.as: Don't use AS_BASENAME or AS_DIRNAME. This removes a bootstrapping problem with the changes described above. The AS_DIRNAME part wasn't used, anyway, and the AS_BASENAME part can be done portably without all the deep Autoconf magic.