================
@@ -96,6 +100,47 @@ the ``<cmath>`` header file to conditionally make a
function constexpr whenever
the constant evaluation of the corresponding builtin (for example,
``std::fmax`` calls ``__builtin_fmax``) is supported in Clang.
+``__has_target_builtin``
+------------------------
+
+This function-like macro takes a single identifier argument that is the name of
+a builtin function, a builtin pseudo-function (taking one or more type
+arguments), or a builtin template.
+It evaluates to 1 if the builtin is supported on the current target or 0 if
not.
+
+``__has_builtin`` and ``__has_target_builtin`` behave identically for normal
C++ compilations.
----------------
sarnex wrote:
yeah that's a fair point, so it sounds like you'd prefer an example of when you
codegen doesn't work even though you are checking with `has_builtin`, and for
that i could show the motiving example for this which is something like
```
void foo() {
#if __has_builtin(__builtin_ia32_pause)
__builtin_ia32_pause()
#else
abort()
#endif
}
```
and if the current target is an offloading target (amdgpu/nvptx/spirv) and the
aux target is x86, we will get a error saying it can't be codegen'd
would that kind of example address your concern? thx
https://github.com/llvm/llvm-project/pull/126324
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