[PATCH] D27827: [ObjC] CodeGen support for @available on macOS

[Nico Weber via Phabricator via cfe-commits]

thakis added a comment.

Looks like the email reply didn't make it to phab, so here it is again:

It's in this program, which is pretty stand-alone: https://cs.chromium.org/chromium/src/chrome/utility/safe_browsing/mac/crdmg.cc?q=crdmg&sq=package:chromium&l=95 EnableSandbox() is on line 134. clang, compiler-rt are trunk from 2 weeks ago, SDK is 10.12, os 10.12.5. I don't think the particular version numbers matter too much though. Here's a standalone demo:

thakis-macpro:src thakis$ cat foo.cc
#include <sandbox.h>
int main() {

  const char sbox[] = "(version 1) (deny default)";
  char* err;
  ::sandbox_init(sbox, 0, &err);
  if (__builtin_available(macos 10.10, *))
    return 32;
  else
    return 14;

}
thakis-macpro:src thakis$ third_party/llvm-build/Release+Asserts/bin/clang -o foo foo.cc -isysroot $(xcrun -show-sdk-path) -mmacosx-version-min=10.9 -w && ./foo
thakis-macpro:src thakis$ echo $?
14
thakis-macpro:src thakis$ sw_vers -productVersion
10.12.5

After running that, look for "sandbox" in console.app to find the "deny file-read-data".


Repository:
  rL LLVM

https://reviews.llvm.org/D27827