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Add pg_nodiscard function declaration specifier

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pg_nodiscard means the compiler should warn if the result of a
function call is ignored.  The name "nodiscard" is chosen in alignment
with (possibly future) C and C++ standards.  It maps to the GCC
attribute warn_unused_result.

Reviewed-by: Michael Paquier <michael@paquier.xyz>
Discussion: https://www.postgresql.org/message-id/flat/e3753562-99cd-b65f-5aca-687dfd1ec2fc@2ndquadrant.com
This commit is contained in:
Peter Eisentraut
2020-10-17 08:38:39 +02:00
parent c77f6f50e4
commit c617aea6ac
1 changed files with 12 additions and 0 deletions
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12
src/include/c.h
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@ -111,6 +111,18 @@
#define pg_attribute_unused()
#endif
/*
* pg_nodiscard means the compiler should warn if the result of a function
* call is ignored. The name "nodiscard" is chosen in alignment with
* (possibly future) C and C++ standards. For maximum compatibility, use it
* as a function declaration specifier, so it goes before the return type.
*/
#ifdef __GNUC__
#define pg_nodiscard __attribute__((warn_unused_result))
#else
#define pg_nodiscard
#endif
/*
* Append PG_USED_FOR_ASSERTS_ONLY to definitions of variables that are only
* used in assert-enabled builds, to avoid compiler warnings about unused