| From: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> |
|---|---|
| To: | Robert Haas <robertmhaas(at)gmail(dot)com> |
| Cc: | Peter Eisentraut <peter_e(at)gmx(dot)net>, Andrew Dunstan <andrew(at)dunslane(dot)net>, pgsql-hackers <pgsql-hackers(at)postgresql(dot)org> |
| Subject: | Re: lots of unused variable warnings in assert-free builds |
| Date: | 2012-01-24 18:03:50 |
| Message-ID: | 9212.1327428230@sss.pgh.pa.us |
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| Lists: | pgsql-hackers |
I wrote:
> Also, it occurs to me that an intermediate macro
> "PG_USED_FOR_ASSERTS_ONLY" would be a good idea, first because it
> documents *why* you want to mark the variable as possibly unused,
> and second because changing the macro definition would provide an easy way
> to check for totally-unused variables, in case we wanted to periodically
> make such checks.
Uh, wait a second. Why not
#ifdef USE_ASSERT_CHECKING
#define PG_USED_FOR_ASSERTS_ONLY
#else
#define PG_USED_FOR_ASSERTS_ONLY __attribute__((unused))
#endif
Then, when you build with asserts on, you *automatically* get told
if the variable is entirely unused.
regards, tom lane
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