Cmake build: Omit "PRE_BUILD" in add_custom_command()

According to cmake warning output while configuring:
CMake Error (dev) at po/CMakeLists.txt:72 (ADD_CUSTOM_COMMAND):
  The following keywords are not supported when using
  add_custom_command(OUTPUT): PRE_BUILD.

  Policy CMP0175 is not set: add_custom_command() rejects invalid arguments.
  Run "cmake --help-policy CMP0175" for policy details.  Use the cmake_policy
  command to set the policy and suppress this warning.
Call Stack (most recent call first):
  po/CMakeLists.txt:106 (add_gettext_python)
This error is for project developers. Use -Wno-error=dev to suppress it.

diff --git a/po/CMakeLists.txt b/po/CMakeLists.txt
index 8b3cbf37ee263c14c5066e30fb54df65d7508a20..6a1ade1bd1125b24772d0169cb80065e18380f47 100755 (executable)
--- a/po/CMakeLists.txt
+++ b/po/CMakeLists.txt
@@ -49,7 +49,6 @@ macro(add_gettext_python  _par _dir)
     endif()
     ADD_CUSTOM_COMMAND(
       OUTPUT "${_dst}"
-      PRE_BUILD
       COMMAND  ${CMAKE_COMMAND}
        "-DTOP_SRC_DIR=${TOP_SRC_DIR}"
        "-DDestFile=${_dst}"
@@ -71,7 +70,6 @@ macro(add_gettext_python  _par _dir)
   else()
     ADD_CUSTOM_COMMAND(
       OUTPUT "${_dst}"
-      PRE_BUILD
       COMMAND ${LYX_PYTHON_EXECUTABLE}
       ARGS "${TOP_SRC_DIR}/po/lyx_pot.py" -b "${TOP_SRC_DIR}" -o "${_dst}" -t ${_par1} "--src_file=${_src_files}"
       DEPENDS ${_sources} ${_src_files} "${TOP_SRC_DIR}/po/lyx_pot.py"