Use std::error_code instead of llvm::error_code.

The idea of this patch is to turn llvm/Support/system_error.h into a
transitional header that just brings in the erorr_code api to the llvm
namespace. I will remove it shortly afterwards.

The cases where the general idea needed some tweaking:

* std::errc is a namespace in msvc, so we cannot use "using std::errc". I could
add an #ifdef, but there were not that many uses, so I just added std:: to
them in this patch.

* Template specialization had to be moved to the std namespace in this
patch set already.

* The msvc implementation of default_error_condition doesn't seem to
provide the same transformations as we need. Not too surprising since
the standard doesn't actually say what "equivalent" means. I fixed the
problem by keeping our old mapping and using it at error_code
construction time.

Despite these shortcomings I think this is still a good thing. Some reasons:

* The different implementations of system_error might improve over time.
* It removes 925 lines of code from llvm already.
* It removes 6313 bytes from the text segment of the clang binary when
it is built with gcc and 2816 bytes when building with clang and
libstdc++.

llvm-svn: 210687

1 files changed, 3 insertions, 3 deletions

diff --git a/llvm/lib/Support/YAMLTraits.cpp b/llvm/lib/Support/YAMLTraits.cpp
index 20f8b245c94..ed80eac76a9 100644
--- a/llvm/lib/Support/YAMLTraits.cpp
+++ b/llvm/lib/Support/YAMLTraits.cpp
@@ -74,7 +74,7 @@ bool Input::setCurrentDocument() {
     Node *N = DocIterator->getRoot();
     if (!N) {
       assert(Strm->failed() && "Root is NULL iff parsing failed");
-      EC = make_error_code(errc::invalid_argument);
+      EC = make_error_code(std::errc::invalid_argument);
       return false;
     }
 
@@ -124,7 +124,7 @@ bool Input::preflightKey(const char *Key, bool Required, bool, bool &UseDefault,
   // nodes are present.
   if (!CurrentNode) {
     if (Required)
-      EC = make_error_code(errc::invalid_argument);
+      EC = make_error_code(std::errc::invalid_argument);
     return false;
   }
 
@@ -300,7 +300,7 @@ void Input::setError(HNode *hnode, const Twine &message) {
 
 void Input::setError(Node *node, const Twine &message) {
   Strm->printError(node, message);
-  EC = make_error_code(errc::invalid_argument);
+  EC = make_error_code(std::errc::invalid_argument);
 }
 
 Input::HNode *Input::createHNodes(Node *N) {