[compiler-rt][builtins] __isOSVersionAtLeast should load CoreFoundation

symbols dynamically

The CoreFoundation symbols uses by __isOSVersionAtLeast should be loaded at
runtime to ensure that the programs that don't use @available won't have to be
linked to CoreFoundation.

The Clang frontend IRGen library will need to emit a CoreFoundation symbol
when @available is used to ensure that programs that actually use @available
are linked to CoreFoundation.

rdar://31039554


git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@297760 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 12 insertions, 0 deletions

diff --git a/test/builtins/TestCases/Darwin/os_version_check_test_no_core_foundation.c b/test/builtins/TestCases/Darwin/os_version_check_test_no_core_foundation.c
new file mode 100644
index 000000000..4e0da35cd
--- /dev/null
+++ b/test/builtins/TestCases/Darwin/os_version_check_test_no_core_foundation.c
@@ -0,0 +1,12 @@
+// RUN: %clang %s -o %t -mmacosx-version-min=10.5
+// RUN: %run %t
+
+int __isOSVersionAtLeast(int Major, int Minor, int Subminor);
+
+int main() {
+  // When CoreFoundation isn't linked, we expect the system version to be 0, 0,
+  // 0.
+  if (__isOSVersionAtLeast(1, 0, 0))
+    return 1;
+  return 0;
+}