There were a bunch of unnecessarily global functions and variables in gzip's sources. In the course of reducing their scope I found at least one variable that was not used at all, and ended up removing the unused crypt.[ch] files.
These changes were inspired by the new-to-gnulib tight_scope syntax-check rule. Now that it's enabled, if someone accidentally declares a new variable or function without the static attribute, "make syntax-check" will fail. [PATCH 1/7] maint: prepare for tight-scope rule: use noinst_HEADERS [PATCH 2/7] maint: remove all uses of OF((...)) prototype-hiding [PATCH 3/7] maint: limit scope of several functions [PATCH 4/7] maint: remove crypt.[ch] stubs [PATCH 5/7] maint: declare many variables to be static [PATCH 6/7] maint: prepare for gnulib's new tight-scope syntax-check [PATCH 7/7] build: update gnulib submodule to latest
