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Add -Wimplicit-fallthrough to CFLAGS and CXXFLAGS

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Use it at level 4, a bit more restrictive than the default level, and
tweak our commanding comments to FALLTHROUGH.

(However, leave zic.c alone, since it's external code; to avoid the
warnings that would appear there, change CFLAGS for that file in the
Makefile.)

Author: Julien Rouhaud <rjuju123@gmail.com>
Author: Álvaro Herrera <alvherre@alvh.no-ip.org>
Reviewed-by: Tom Lane <tgl@sss.pgh.pa.us>
Discussion: https://postgr.es/m/20200412081825.qyo5vwwco3fv4gdo@nol
Discussion: https://postgr.es/m/flat/E1fDenm-0000C8-IJ@gemulon.postgresql.org
This commit is contained in:
Alvaro Herrera
2020-05-12 16:01:52 -04:00
parent 6a918c3ac8
commit 3e9744465d
33 changed files with 269 additions and 171 deletions
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2
src/backend/utils/adt/formatting.c
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@ -3425,7 +3425,7 @@ DCH_from_char(FormatNode *node, const char *in, TmFromChar *out,
case DCH_FF5:
case DCH_FF6:
out->ff = n->key->id - DCH_FF1 + 1;
/* fall through */
/* FALLTHROUGH */
case DCH_US: /* microsecond */
len = from_char_parse_int_len(&out->us, &s,
n->key->id == DCH_US ? 6 :