callr 3.7.6

• If the CALLR_NO_TEMP_DLLS=true env var is set then callr does not
  copy the dll the client DLL files from, in the subprocess. By
  default callr copies the DLL file that drives the callr subprocess into
  a temporary directory and loads it from there (#273).

callr 3.7.5

• No changes.

callr 3.7.4

• The r_session$get_running_time() method now returns the correct
  values, as documented (#241, @djnavarro).

• callr now uses fully qualified function calls in the subprocess to
  avoid interference with functions defined in the global environment.
  I.e. base::stderr() instead of stderr(). Closes #246.

callr 3.7.3

• Errors from callr now include the standard output (in $stdout) and
  standard error (in stderr) again. The standard output and error are also
  printed on error in non-interactive sessions, and a note is printed about
  them in interactive sessions.

callr 3.7.2

• New function add_hook() to hook into the callr process startup and
  options. This is for experts and it is also currently experimental
  (#203, @klmr).

callr 3.7.1

• When copying existing startup files, an additional newline is appended to
  protect against a missing newline at the end of the file. This would
  cause R ignore that line (#205).

• Serialization of objects passed between sessions now uses compress=FALSE
  by default. The default can be changed by setting the
  callr.compress_transport option (#223, @dfalbel).

• We have revamped callr's error objects, with lots of improvements to the
  output.

v3.7.0

• Reporting errors is much faster now (#185).

• The user_profile option of r_vanilla() defaults to FALSE now (#194).

• It is now possible to set R environment variables (R_ENVIRON_USER,
  R_PROFILE_USER, etc.) via the env argument (#193).

v3.6.0

• callr now supports starting an R process with a different architecture,
  so on Windows 64-bit R can start a 32-bit R background process, and
  vice-versa (#95).

• callr now handles symbolic arguments properly, and does not evaluate them.
  E.g. callr::r(function(x) x, list(quote(foobar))) works now (#175).

• callr::r_session does not leak file descriptors now in the sub-process
  (#184).

v3.5.1

• callr::r_session now handles large messages from the subprocess
  well (#168).

v3.5.0

• callr can now pass the environment of the function to the subprocess,
  optionally. This makes it easier to call an internal function of a
  package in a subprocess. See the package argument of r(), r_bg(),
  r_session$run(), etc. (#147).