sarnex wrote:
> GCC has __has_builtin, so how do they handle offloading targets? Do they have
> the same odd behavior where __has_builtin returns true for builtins it cannot
> actually emit code for?
Setting up offloading for GCC was a nightmare, but it looks like the behavior
is the same as clang (available builtins are the union of host + offload).
I tried this example:
```
int main() {
int x = 0;
#pragma omp target
{
for(int i = 0; i < 100; i++) {
#if __has_builtin(__builtin_ia32_pause)
__builtin_ia32_pause();
#endif
x+= i;
}
}
return x;
}
```
with flags:
```
g++-14 -fopenmp -foffload=amdgcn-amdhsa="-march=gfx1103" foo.cpp
-fcf-protection=none
```
and i got
```
lto1: fatal error: target specific builtin not available
```
https://github.com/llvm/llvm-project/pull/126324
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