[NaCl SDK] Enable linux host build for nacl_io and nacl_io_tests.

native_client_sdk/src/libraries/nacl_io/mount_node_mem.cc

Index: native_client_sdk/src/libraries/nacl_io/mount_node_mem.cc
diff --git a/native_client_sdk/src/libraries/nacl_io/mount_node_mem.cc b/native_client_sdk/src/libraries/nacl_io/mount_node_mem.cc
index 5ae7095d923aa053f70d842110cfb56a3143680e..1b734f91155bc6d0e114deac37c24afedbccf0d8 100644
--- a/native_client_sdk/src/libraries/nacl_io/mount_node_mem.cc
+++ b/native_client_sdk/src/libraries/nacl_io/mount_node_mem.cc
@@ -42,7 +42,7 @@ Error MountNodeMem::Read(const HandleAttr& attr,
 
   size_t size = stat_.st_size;
 
-  if (attr.offs + count > size) {
+  if (attr.offs + count > static_cast<size_t>(size)) {

[binji, 2013/11/15 17:26:23]

Why is this necessary? size is already a size_t.

[Sam Clegg, 2013/11/15 18:13:34]

Done.

     count = size - attr.offs;
   }
 
@@ -61,7 +61,7 @@ Error MountNodeMem::Write(const HandleAttr& attr,
   if (count == 0)
     return 0;
 
-  if (count + attr.offs > stat_.st_size) {
+  if (count + attr.offs > static_cast<size_t>(stat_.st_size)) {
     Resize(count + attr.offs);
     count = stat_.st_size - attr.offs;
   }
@@ -78,7 +78,7 @@ Error MountNodeMem::FTruncate(off_t new_size) {
 }
 
 void MountNodeMem::Resize(off_t new_size) {
-  if (new_size > data_.capacity()) {
+  if (new_size > static_cast<off_t>(data_.capacity())) {
     // While the node size is small, grow exponentially. When it starts to get
     // larger, grow linearly.
     size_t extra = std::min<size_t>(new_size, kMaxResizeIncrement);