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Tom Lane 44cd434ec4 Fix behavior of ecpg's "EXEC SQL elif name". 
This ought to work much like C's "#elif defined(name)"; but the code
implemented it in a way equivalent to endif followed by ifdef, so that
it didn't matter whether any previous branch of the IF construct had
succeeded.  Fix that; add some test cases covering elif and nested IFs;
and improve the documentation, which also seemed a bit confused.

AFAICS the code has been like this since the feature was added in 1999
(commit b57b0e044).  So while it's surely wrong, there might be code
out there relying on the current behavior.  Hence, don't back-patch
into stable branches.  It seems all right to fix it in v13 though.

Per report from Ashutosh Sharma.  Reviewed by Ashutosh Sharma and
Michael Meskes.

Discussion: https://postgr.es/m/CAE9k0P=dQk9X0cU2tN49S7a9tv733-e1pVdpB1P-pWJ5PdTktg@mail.gmail.com
2020-08-03 09:46:12 -04:00
..
backend Use int64 instead of long in incremental sort code 2020-08-02 14:23:57 +12:00
bin Fix minor issues in psql's new \dAc and related commands. 2020-08-02 17:00:26 -04:00
common Move frontend-side archive APIs from src/common/ to src/fe_utils/ 2020-06-11 15:48:56 +09:00
fe_utils Move frontend-side archive APIs from src/common/ to src/fe_utils/ 2020-06-11 15:48:56 +09:00
include Use int64 instead of long in incremental sort code 2020-08-02 14:23:57 +12:00
interfaces Fix behavior of ecpg's "EXEC SQL elif name". 2020-08-03 09:46:12 -04:00
makefiles Remove libpq.rc, use win32ver.rc for libpq 2020-01-15 15:06:12 +01:00
pl Translation updates 2020-06-22 14:08:30 +02:00
port Clear some style deviations. 2020-05-21 08:31:16 -07:00
template Fix compiler warning for ppoll() on Cygwin 2019-12-22 23:20:00 +01:00
test Fix rare failure in LDAP tests. 2020-08-03 12:43:11 +12:00
timezone Ensure that distributed timezone abbreviation files are plain ASCII. 2020-07-17 11:04:22 -04:00
tools Improve vacuum error context handling. 2020-07-01 08:06:00 +05:30
tutorial Update copyrights for 2020 2020-01-01 12:21:45 -05:00
.gitignore Convert cvsignore to gitignore, and add .gitignore for build targets. 2010-09-22 12:57:04 +02:00
DEVELOPERS
Makefile Fix partial-build problems introduced by having more generated headers. 2018-04-09 16:42:10 -04:00
Makefile.global.in Update Unicode data to Unicode 13.0.0 and CLDR 37 2020-04-24 09:52:59 +02:00
Makefile.shlib Add PostgreSQL home page to --help output 2020-02-28 13:12:21 +01:00
nls-global.mk NLS: Fix backend gettext triggers 2019-09-23 09:04:20 +02:00