Revert "[Support] Add RetryAfterSignal helper function" and subsequent fix

The fix in r306003 uncovered a pretty fundamental problem that libc++
implementation of std::result_of does not handle the prototype of
open(2) correctly (presumably because it contains ...). This makes the
whole function unusable in its current form, so I am also reverting the
original commit (r305892), which introduced the function, at least until
I figure out a way to solve the libc++ issue.

llvm-svn: 306005

1 files changed, 0 insertions, 13 deletions

diff --git a/llvm/include/llvm/Support/Errno.h b/llvm/include/llvm/Support/Errno.h
index 201b5598c02..4ce65e7dc83 100644
--- a/llvm/include/llvm/Support/Errno.h
+++ b/llvm/include/llvm/Support/Errno.h
@@ -16,7 +16,6 @@
 
 #include <cerrno>
 #include <string>
-#include <type_traits>
 
 namespace llvm {
 namespace sys {
@@ -30,18 +29,6 @@ std::string StrError();
 /// Like the no-argument version above, but uses \p errnum instead of errno.
 std::string StrError(int errnum);
 
-template <typename Fun, typename... Args,
-          typename ResultT = std::result_of<Fun const &(const Args &...)>>
-inline typename ResultT::type RetryAfterSignal(typename ResultT::type Fail,
-                                               const Fun &F,
-                                               const Args &... As) {
-  typename ResultT::type Res;
-  do
-    Res = F(As...);
-  while (Res == Fail && errno == EINTR);
-  return Res;
-}
-
 }  // namespace sys
 }  // namespace llvm