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.

llvm-svn: 74621

1 files changed, 2 insertions, 26 deletions

diff --git a/llvm/lib/System/Unix/Unix.h b/llvm/lib/System/Unix/Unix.h
index c2c06dd114e..c15866f3d90 100644
--- a/llvm/lib/System/Unix/Unix.h
+++ b/llvm/lib/System/Unix/Unix.h
@@ -20,6 +20,7 @@
 //===----------------------------------------------------------------------===//
 
 #include "llvm/Config/config.h"     // Get autoconf configuration settings
+#include "llvm/System/Errno.h"
 #include <cstdlib>
 #include <cstdio>
 #include <cstring>
@@ -77,34 +78,9 @@ static inline bool MakeErrMsg(
   std::string* ErrMsg, const std::string& prefix, int errnum = -1) {
   if (!ErrMsg)
     return true;
-  char buffer[MAXPATHLEN];
-  buffer[0] = 0;
-  char* str = buffer;
   if (errnum == -1)
     errnum = errno;
-#ifdef HAVE_STRERROR_R
-  // strerror_r is thread-safe.
-  if (errnum)
-# if defined(__GLIBC__) && defined(_GNU_SOURCE)
-    // glibc defines its own incompatible version of strerror_r
-    // which may not use the buffer supplied.
-    str = strerror_r(errnum,buffer,MAXPATHLEN-1);
-# else
-    strerror_r(errnum,buffer,MAXPATHLEN-1);
-# endif
-#elif HAVE_STRERROR
-  // Copy the thread un-safe result of strerror into
-  // the buffer as fast as possible to minimize impact
-  // of collision of strerror in multiple threads.
-  if (errnum)
-    strncpy(buffer,strerror(errnum),MAXPATHLEN-1);
-  buffer[MAXPATHLEN-1] = 0;
-#else
-  // Strange that this system doesn't even have strerror
-  // but, oh well, just use a generic message
-  sprintf(buffer, "Error #%d", errnum);
-#endif
-  *ErrMsg = prefix + ": " + str;
+  *ErrMsg = prefix + ": " + llvm::sys::StrError(errnum);
   return true;
 }