glibc has two versions of strerror_r, a standards compliant one and a GNU

[oota-llvm.git] / lib / System / Unix / Unix.h

diff --git a/lib/System/Unix/Unix.h b/lib/System/Unix/Unix.h
index 452226f4f79ab4bb2eff04964e7ca404782b199a..c2c06dd114e507eb58c00efaa6a7b73cb5e1923a 100644 (file)
--- a/lib/System/Unix/Unix.h
+++ b/lib/System/Unix/Unix.h
@@ -79,12 +79,19 @@ static inline bool MakeErrMsg(
     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
@@ -97,7 +104,7 @@ static inline bool MakeErrMsg(
   // but, oh well, just use a generic message
   sprintf(buffer, "Error #%d", errnum);
 #endif
-  *ErrMsg = prefix + ": " + buffer;
+  *ErrMsg = prefix + ": " + str;
   return true;
 }