| From: | Robert Haas <robertmhaas(at)gmail(dot)com> |
|---|---|
| To: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> |
| Cc: | Jeff Janes <jeff(dot)janes(at)gmail(dot)com>, Dilip Kumar <dilipbalaut(at)gmail(dot)com>, Thomas Munro <thomas(dot)munro(at)enterprisedb(dot)com>, Haribabu Kommi <kommi(dot)haribabu(at)gmail(dot)com>, Rafia Sabih <rafia(dot)sabih(at)enterprisedb(dot)com>, tushar <tushar(dot)ahuja(at)enterprisedb(dot)com>, Amit Khandekar <amitdkhan(dot)pg(at)gmail(dot)com>, Amit Kapila <amit(dot)kapila16(at)gmail(dot)com>, Andres Freund <andres(at)anarazel(dot)de>, pgsql-hackers <pgsql-hackers(at)postgresql(dot)org> |
| Subject: | Re: Parallel bitmap heap scan |
| Date: | 2017-03-08 18:00:06 |
| Message-ID: | CA+TgmoaBRCRq6qZ1_KMiKSQDuoawqK4Co=q+ycbZRphOUwkV7A@mail.gmail.com |
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| Lists: | pgsql-hackers |
On Wed, Mar 8, 2017 at 12:53 PM, Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> wrote:
>> Thanks. Sorry for the hassle; my compiler isn't as picky about this
>> as I would like, and apparently Dilip's isn't either.
>
> Might be interesting to see whether -O level affects it. In principle,
> whether you get the warning should depend on how much the compiler has
> analyzed the logic flow ...
What I'm using is:
Configured with:
--prefix=/Applications/Xcode.app/Contents/Developer/usr
--with-gxx-include-dir=/usr/include/c++/4.2.1
Apple LLVM version 7.0.2 (clang-700.1.81)
Target: x86_64-apple-darwin14.5.0
Thread model: posix
While I haven't experimented with this too extensively, my general
impression is that this thing is extremely tolerant of uninitialized
variables. I just tried compiling nodeBitmapHeapscan.c with -Wall
-Werror and each of -O0, -O1, -O2, and -O3, and none of those produced
any warnings. I've been reluctant to go to the hassle of installing a
different compiler...
--
Robert Haas
EnterpriseDB: http://www.enterprisedb.com
The Enterprise PostgreSQL Company
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