Cmake build: No need to recreate lyx.pot on every make call.

We can check if imput data for 'gettext' command has changed from previous call.
If not, there is no need to recreate lyx.pot, which we only differ in
	"POT-Creation-Date: ...."

diff --git a/po/CMakeLists.txt b/po/CMakeLists.txt
index 676ecdef9db336fd9e2afdf2f9bb33507c91f77e..5b0aec716fb8050b27d984abb30aa103ba38ac12 100755 (executable)
--- a/po/CMakeLists.txt
+++ b/po/CMakeLists.txt
@@ -74,6 +74,7 @@ endmacro(add_gettext_python)
 
 SET_SOURCE_FILES_PROPERTIES("${CMAKE_CURRENT_BINARY_DIR}/${_lyxname}.cat.pot" GENERATED)
 SET_SOURCE_FILES_PROPERTIES("${CMAKE_CURRENT_BINARY_DIR}/${_lyxname}.fmt.pot" GENERATED)
+SET_SOURCE_FILES_PROPERTIES("${CMAKE_CURRENT_BINARY_DIR}/${_lyxname}.fmtx.pot" GENERATED)
 SET_SOURCE_FILES_PROPERTIES("${CMAKE_CURRENT_BINARY_DIR}/${_lyxname}.pot" GENERATED)
 
 add_gettext_python(qt4 src/frontends/qt4/ui *.ui)
@@ -117,9 +118,15 @@ foreach(_f ${_tmp_potfiles})
   file(APPEND ${CMAKE_CURRENT_BINARY_DIR}/POTFILES.in "${_f}\n")
 endforeach(_f)
 
+add_custom_command(
+  OUTPUT "${CMAKE_CURRENT_BINARY_DIR}/${_lyxname}.fmtx.pot"
+  COMMAND ${CMAKE_COMMAND} -E copy_if_different "${CMAKE_CURRENT_BINARY_DIR}/${_lyxname}.fmt.pot" "${CMAKE_CURRENT_BINARY_DIR}/${_lyxname}.fmtx.pot"
+  DEPENDS "${CMAKE_CURRENT_BINARY_DIR}/${_lyxname}.fmt.pot"
+  )
+
 ADD_CUSTOM_COMMAND(
     OUTPUT "${CMAKE_CURRENT_BINARY_DIR}/${_lyxname}.pot"
-    COMMAND ${CMAKE_COMMAND} -E copy "${CMAKE_CURRENT_BINARY_DIR}/${_lyxname}.fmt.pot" "${CMAKE_CURRENT_BINARY_DIR}/${_lyxname}.pot"
+    COMMAND ${CMAKE_COMMAND} -E copy "${CMAKE_CURRENT_BINARY_DIR}/${_lyxname}.fmtx.pot" "${CMAKE_CURRENT_BINARY_DIR}/${_lyxname}.pot"
     COMMAND ${GETTEXT_XGETTEXT_EXECUTABLE}
       --default-domain=${_lyxname} --directory=${TOP_SRC_DIR}
       --add-comments=TRANSLATORS:
@@ -127,7 +134,7 @@ ADD_CUSTOM_COMMAND(
       --files-from=${CMAKE_CURRENT_BINARY_DIR}/POTFILES.in
       --copyright-holder="LyX Developers" --msgid-bugs-address=lyx-devel@lists.lyx.org
       -o "${CMAKE_CURRENT_BINARY_DIR}/${_lyxname}.pot"
-    DEPENDS "${CMAKE_CURRENT_BINARY_DIR}/${_lyxname}.fmt.pot" ${_potfiles_dep}
+    DEPENDS "${CMAKE_CURRENT_BINARY_DIR}/${_lyxname}.fmtx.pot" ${_potfiles_dep}
     )
 
 #