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Cast to void in StaticAssertExpr, not its callers.

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Seems a bit silly that many (in fact all, as of today) uses of
StaticAssertExpr would need to cast it to void to avoid warnings from
pickier compilers.  Let's just do the cast right in the macro, instead.

In passing, change StaticAssertExpr to StaticAssertStmt in one
place where that seems more apropos.

Discussion: https://postgr.es/m/16161.1518715186@sss.pgh.pa.us
This commit is contained in:
Tom Lane 2018-02-15 13:41:30 -05:00
parent 03c5a00ea3
commit 51940f9760
2 changed files with 6 additions and 6 deletions
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4
src/backend/storage/lmgr/lwlock.c
View File

@ -380,10 +380,10 @@ LWLockShmemSize(void)
void
CreateLWLocks(void)
{
StaticAssertExpr(LW_VAL_EXCLUSIVE > (uint32) MAX_BACKENDS,
StaticAssertStmt(LW_VAL_EXCLUSIVE > (uint32) MAX_BACKENDS,
"MAX_BACKENDS too big for lwlock.c");
StaticAssertExpr(sizeof(LWLock) <= LWLOCK_MINIMAL_SIZE &&
StaticAssertStmt(sizeof(LWLock) <= LWLOCK_MINIMAL_SIZE &&
sizeof(LWLock) <= LWLOCK_PADDED_SIZE,
"Miscalculated LWLock padding");

8
src/include/c.h
View File

@ -779,7 +779,7 @@ extern void ExceptionalCondition(const char *conditionName,
#define StaticAssertStmt(condition, errmessage) \
do { _Static_assert(condition, errmessage); } while(0)
#define StaticAssertExpr(condition, errmessage) \
({ StaticAssertStmt(condition, errmessage); true; })
((void) ({ StaticAssertStmt(condition, errmessage); true; }))
#else /* !HAVE__STATIC_ASSERT */
#define StaticAssertStmt(condition, errmessage) \
((void) sizeof(struct { int static_assert_failure : (condition) ? 1 : -1; }))
@ -796,7 +796,7 @@ extern void ExceptionalCondition(const char *conditionName,
#define StaticAssertStmt(condition, errmessage) \
do { struct static_assert_struct { int static_assert_failure : (condition) ? 1 : -1; }; } while(0)
#define StaticAssertExpr(condition, errmessage) \
({ StaticAssertStmt(condition, errmessage); })
((void) ({ StaticAssertStmt(condition, errmessage); }))
#endif
#endif /* C++ */
@ -817,14 +817,14 @@ extern void ExceptionalCondition(const char *conditionName,
StaticAssertStmt(__builtin_types_compatible_p(__typeof__(varname), typename), \
CppAsString(varname) " does not have type " CppAsString(typename))
#define AssertVariableIsOfTypeMacro(varname, typename) \
((void) StaticAssertExpr(__builtin_types_compatible_p(__typeof__(varname), typename), \
(StaticAssertExpr(__builtin_types_compatible_p(__typeof__(varname), typename), \
CppAsString(varname) " does not have type " CppAsString(typename)))
#else /* !HAVE__BUILTIN_TYPES_COMPATIBLE_P */
#define AssertVariableIsOfType(varname, typename) \
StaticAssertStmt(sizeof(varname) == sizeof(typename), \
CppAsString(varname) " does not have type " CppAsString(typename))
#define AssertVariableIsOfTypeMacro(varname, typename) \
((void) StaticAssertExpr(sizeof(varname) == sizeof(typename), \
(StaticAssertExpr(sizeof(varname) == sizeof(typename), \
CppAsString(varname) " does not have type " CppAsString(typename)))
#endif /* HAVE__BUILTIN_TYPES_COMPATIBLE_P */