The -DHAVE_NANOSLEEP=0 compile-time option can be used to build on systems
(if any still exist) where this is not the case.
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leaks in the command-line shell. Add a clang analysis of the command-line
shell to the "warnings-clang.sh" script. Other minor cleanups to the
command-line shell code.
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for verifying that the library exports the correct symbols (tool/symbols.sh),
and to demonstrate building a full-featured command-line shell
(tool/build-shell.sh).
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