Don't use std::errc.

As noted on Errc.h:

// * std::errc is just marked with is_error_condition_enum. This means that
//   common patters like AnErrorCode == errc::no_such_file_or_directory take
//   4 virtual calls instead of two comparisons.

And on some libstdc++ those virtual functions conclude that

------------------------
int main() {
  std::error_code foo = std::make_error_code(std::errc::no_such_file_or_directory);
  return foo == std::errc::no_such_file_or_directory;
}
-------------------------

should exit with 0.

llvm-svn: 239683

1 files changed, 3 insertions, 2 deletions

diff --git a/llvm/lib/Support/Unix/Program.inc b/llvm/lib/Support/Unix/Program.inc
index 5816fb812e9..8947b62e4dc 100644
--- a/llvm/lib/Support/Unix/Program.inc
+++ b/llvm/lib/Support/Unix/Program.inc
@@ -20,6 +20,7 @@
 #include "llvm/ADT/StringExtras.h"
 #include "llvm/Config/config.h"
 #include "llvm/Support/Compiler.h"
+#include "llvm/Support/Errc.h"
 #include "llvm/Support/FileSystem.h"
 #include "llvm/Support/Path.h"
 #include "llvm/Support/raw_ostream.h"
@@ -92,7 +93,7 @@ ErrorOr<std::string> sys::findProgramByName(StringRef Name,
     if (sys::fs::can_execute(FilePath.c_str()))
       return std::string(FilePath.str()); // Found the executable!
   }
-  return std::errc::no_such_file_or_directory;
+  return errc::no_such_file_or_directory;
 }
 
 static bool RedirectIO(const StringRef *Path, int FD, std::string* ErrMsg) {
@@ -447,7 +448,7 @@ llvm::sys::writeFileWithEncoding(StringRef FileName, StringRef Contents,
   OS << Contents;
 
   if (OS.has_error())
-    return std::make_error_code(std::errc::io_error);
+    return make_error_code(errc::io_error);
 
   return EC;
 }