ref-manual: Updated TMPDIR description for NFS issues.

Fixes [YOCTO #5442]

Updated the description to note that TMPDIR cannot be on NFS
since it has issues that mess up the build process.

(From yocto-docs rev: a2fa1c8a23ee7a26fa362e089d84747b4cb4618b)

Signed-off-by: Scott Rifenbark <scott.m.rifenbark@intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

1 files changed, 11 insertions, 0 deletions

diff --git a/documentation/ref-manual/ref-variables.xml b/documentation/ref-manual/ref-variables.xml
index a0f53713b0..ceb92c9cb6 100644
--- a/documentation/ref-manual/ref-variables.xml
+++ b/documentation/ref-manual/ref-variables.xml
@@ -7319,6 +7319,17 @@ recipes-graphics/xorg-font/font-alias_1.0.3.bb:PR = "${INC_PR}.3"
      #TMPDIR = "${TOPDIR}/tmp"
                     </literallayout>
                 </para>
+
+                <para>
+                    The filesystem used by <filename>TMPDIR</filename> must
+                    have standard filesystem semantics (i.e. mixed-case files
+                    are unique, POSIX file locking, and persistent inodes).
+                    Due to various issues with NFS and bugs in some
+                    implementations, NFS does not meet this minimum
+                    requirement.
+                    Consequently, <filename>TMPDIR</filename> cannot be on
+                    NFS.
+                </para>
             </glossdef>
         </glossentry>