Mark functions as pure of const, per recommendations enabled by
new gcc -W options. Apply _GL_ATTRIBUTE_PURE and _GL_ATTRIBUTE_CONST.
* src/common.h: Apply new function attributes.
* src/pch.c: Likewise.
* src/pch.h: Likewise.
* src/util.c: Likewise.
* src/util.h: Likewise.
* configure.ac: Use -Wno-format-nonliteral.
* m4/.gitignore: Update.
* gnulib: Update to latest.
* cfg.mk: Exempt src/util.c from two tests, to avoid new
"make syntax-check" failures.
* bootstrap.conf (gnulib_modules): Include gnulib's signal module,
so that signal.h guarantees definition of certain macros.
* src/util.c (SIG_BLOCK, SIG_UNBLOCK, SIG_SETMASK): Remove definition.
Now, gnulib guarantees that these are defined.
* src/common.h (SIZE_MAX): Likewise.
* cfg.mk (local-checks-to-skip): Enable the
sc_prohibit_always-defined_macros check, now that it passes.
* src/patch.c (main): Call set_program_name rather than
initializing program_name explicitly.
* src/common.h: Include progname.h rather than declaring the extern,
program_name.
* bootstrap.conf (gnulib_modules): Add progname.
* cfg.mk (local-checks-to-skip): Remove sc_program_name,
thus enabling this test.
* bootstrap: Update from gnulib.
* cfg.mk (local-checks-to-skip): Remove (thus, enable)
sc_copyright_check, now that the gnulib submodule is up to date.
* cfg.mk (local-checks-to-skip): Define, to skip all of the
currently-failing syntax-check rules. We'll reenable them
one by one, as problems are addressed.
* cfg.mk: New file, to configure maint.mk.
* Makefile.am (EXTRA_DIST): Add, so the new file is distributed.
(config_h_header): Define, to make the sc_require_config_h_first
syntax-check test pass.
* pc/chdirsaf.c: Include <config.h>.
