Add a portable strerror*() wrapper, llvm::sys::StrError().  This includes the
Windows variant, strerror_s, but I couldn't test that.

I'll update configure and config.h.in in a subsequent patch.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@74621 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/tools/gold/gold-plugin.cpp b/tools/gold/gold-plugin.cpp
index 8d8fcd2..146c53f 100644
--- a/tools/gold/gold-plugin.cpp
+++ b/tools/gold/gold-plugin.cpp
@@ -17,6 +17,7 @@
 #include "llvm-c/lto.h"
 
 #include "llvm/Support/raw_ostream.h"
+#include "llvm/System/Errno.h"
 #include "llvm/System/Path.h"
 #include "llvm/System/Program.h"
 
@@ -183,7 +184,7 @@
       (*message)(LDPL_ERROR,
                  "Failed to seek to archive member of %s at offset %d: %s\n", 
                  file->name,
-                 file->offset, strerror(errno));
+                 file->offset, sys::StrError(errno).c_str());
       return LDPS_ERR;
     }
     buf = malloc(file->filesize);
@@ -198,7 +199,7 @@
                  "Failed to read archive member of %s at offset %d: %s\n",
                  file->name,
                  file->offset,
-                 strerror(errno));
+                 sys::StrError(errno).c_str());
       free(buf);
       return LDPS_ERR;
     }