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, 2 insertions, 2 deletions

diff --git a/llvm/lib/Support/LockFileManager.cpp b/llvm/lib/Support/LockFileManager.cpp
index 05e75cff1ac..2b7fc812d51 100644
--- a/llvm/lib/Support/LockFileManager.cpp
+++ b/llvm/lib/Support/LockFileManager.cpp
@@ -114,7 +114,7 @@ LockFileManager::LockFileManager(StringRef FileName)
     if (Out.has_error()) {
       // We failed to write out PID, so make up an excuse, remove the
       // unique lock file, and fail.
-      Error = make_error_code(errc::no_space_on_device);
+      Error = make_error_code(std::errc::no_space_on_device);
       sys::fs::remove(UniqueLockFileName.c_str());
       return;
     }
@@ -127,7 +127,7 @@ LockFileManager::LockFileManager(StringRef FileName)
     if (!EC)
       return;
 
-    if (EC != errc::file_exists) {
+    if (EC != std::errc::file_exists) {
       Error = EC;
       return;
     }