Author: Colin Watson
Author Date: 2019-08-25 21:51:37 UTC

Enable many more GCC warnings

* bootstrap.conf (gnulib_modules): Add manywarnings.
* configure.ac: Add gl_MANYWARN_ALL_GCC, with some refinements to
disable -Wsystem-headers and -Wmissing-field-initializers. Define
GNULIB_NO_VLA=1 to avoid tripping over -Wvla.
* src/accessdb.c (help_filter): Disable -Wformat-nonliteral around this
function.
* src/man.c (help_filter): Likewise.
* src/check_mandirs.c (gripe_rwopen_failed, update_db_time): Factor out
EAGAIN || EWOULDBLOCK check to ...
(is_eagain): ... here, with -Wlogical-op disabled.
* src/lexgrog.l, src/zsoelim.l: Disable -Wsuggest-attribute=malloc,
-Wsuggest-attribute=pure, and -Wunused-macros.