What is the equivalent of GCC's #pragma GCC optimize("O0")
or VS's #pragma optimize("", off)
in Apple LLVM 5.0 compiler?
I need it to disable optimizations for just a section of code.
From a brief search it doesn't look like clang/llvm supports such a pragma at this time. If you don't want to turn off optimizations for an entire file I suggest factoring what you don't want optimized into a separate file and setting -O0 on it separately.
Actually there is now a way to do that by specifying an __attribute__ ((optnone))
to the function that wraps the code you don't want to be optimized.
For instance I'm using it to have a clear benchmark of an inline function
static void BM_notoptimizedfunction(benchmark::State& state) __attribute__ ((optnone)) {
// your code here won't be optimized by clang
}
And that's it !
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