Worked around a compilation problem on RTEMS.

Closes boostorg#240.

Author: Lastique

doc/release_history.html

@@ -43,6 +43,7 @@ <h2>1.80.0</h2>
 <ul>
   <li>On Windows, added a fallback implementation for querying file attributes in case if the file cannot be opened with <code>ERROR_ACCESS_DENIED</code> error. This may allow <code>status</code> and <code>symlink_status</code> to succeed for system files and directories that are not reparse points or symlinks. (<a href="https://github.com/boostorg/filesystem/issues/234">#234</a>)</li>
   <li>On Windows, added a workaround for FAT/exFAT filesystems that produce <code>ERROR_INVALID_PARAMETER</code> when querying file attributes. This affected <code>status</code> and <code>symlink_status</code>, which reported that files do not exist, and directory iterators, which failed to construct, as well as other dependent operations. (<a href="https://github.com/boostorg/filesystem/issues/236">#236</a>, <a href="https://github.com/boostorg/filesystem/issues/237">#237</a>)</li>
+  <li>Worked around a compilation problem on <a href="https://www.rtems.org/">RTEMS</a>. (<a href="https://github.com/boostorg/filesystem/pull/240">#240</a>)</li>
 </ul>
 
 <h2>1.79.0</h2>

src/operations.cpp

@@ -3392,6 +3392,7 @@ void permissions(path const& p, perms prms, system::error_code* ec)
     !(defined(linux) || defined(__linux) || defined(__linux__)) && \
     !(defined(__MAC_OS_X_VERSION_MIN_REQUIRED) && __MAC_OS_X_VERSION_MIN_REQUIRED < 101000) && \
     !(defined(__IPHONE_OS_VERSION_MIN_REQUIRED) && __IPHONE_OS_VERSION_MIN_REQUIRED < 80000) && \
+    !(defined(__rtems__)) && \
     !(defined(__QNX__) && (_NTO_VERSION <= 700))
     if (::fchmodat(AT_FDCWD, p.c_str(), mode_cast(prms), !(prms & symlink_perms) ? 0 : AT_SYMLINK_NOFOLLOW))
 #else // fallback if fchmodat() not supported