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ircd: Mitigate __builtin_assume w/ side-effects diagnosed (arguably incorrect) and ignored.

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This commit is contained in:
Jason Volk 2023-02-08 17:24:02 -08:00
parent 8e983880f2
commit 3f82d32619
1 changed files with 9 additions and 3 deletions
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12
include/ircd/portable.h
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@ -68,10 +68,16 @@
//
#if !defined(assume)
#if __has_builtin(__builtin_assume)
#define assume(x) assert(x); __builtin_assume(x);
#if __has_builtin(__builtin_assume) && defined(__cplusplus)
// If the expression is 'evaluated' (llvm) (which includes any
// function call not explicitly annotated pure, even when fully
// inlined) then the assume is diagnosed by -Wassume and ignored.
// Declaring the bool mitigates this.
#define assume(x) assert(x); ({ const bool y(x); __builtin_assume(y); })
#elif __has_builtin(__builtin_assume)
#define assume(x) assert(x); __builtin_assume(x)
#else
#define assume(x) assert(x);
#define assume(x) assert(x)
#endif
#endif