maintainer-makefile: make syntax-check a no-op from tarballs

[pspp] / ChangeLog

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+2011-02-16  Eric Blake  <eblake@redhat.com>
+
+       maintainer-makefile: make syntax-check a no-op from tarballs
+       * top/maint.mk (no-vc-detected): New rule.
+       (local-checks-available): Use it to avoid hanging if someone tries
+       'make syntax-check' from a tarball.  Also append to any non-syntax
+       checks already defined in cfg.mk.
+
 2011-02-16  Paul Eggert  <eggert@cs.ucla.edu>
 
        longlong: tune, particularly for common case of c99