CMake: Make GLOB work with new files (most of the time).

Caveats: <https://cmake.org/cmake/help/latest/command/file.html#filesystem>

src/CMakeLists.txt

@@ -6,8 +6,8 @@ configure_file("fs-compat.hpp.in" "fs-compat.hpp" @ONLY)
 # The library is only here for the tests.
 add_library(${PROJECT_NAME}_lib STATIC)
 
-file(GLOB_RECURSE sources_src *.cpp)
-file(GLOB_RECURSE headers_src *.hpp)
+file(GLOB sources_src CONFIGURE_DEPENDS *.cpp)
+file(GLOB headers_src CONFIGURE_DEPENDS *.hpp)
 list(REMOVE_ITEM sources_src "${CMAKE_CURRENT_SOURCE_DIR}/main.cpp")
 
 target_sources(${PROJECT_NAME}_lib

tests/CMakeLists.txt

@@ -1,6 +1,6 @@
 include(CTest)
 
-file(GLOB sources_tests test_*.cpp)
+file(GLOB sources_tests CONFIGURE_DEPENDS test_*.cpp)
 file(COPY "test.zip" DESTINATION ${CMAKE_CURRENT_BINARY_DIR})
 file(COPY "test.epub2" DESTINATION ${CMAKE_CURRENT_BINARY_DIR})
 file(COPY "test.epub3" DESTINATION ${CMAKE_CURRENT_BINARY_DIR})

translations/CMakeLists.txt

@@ -1,6 +1,7 @@
 set(potfile "${PROJECT_SOURCE_DIR}/translations/${PROJECT_NAME}.pot")
-file(GLOB po_src_files "../src/*pp")
-file(GLOB po_src_files_relative RELATIVE "${PROJECT_SOURCE_DIR}" "../src/*pp")
+file(GLOB po_src_files CONFIGURE_DEPENDS "../src/*pp")
+file(GLOB po_src_files_relative CONFIGURE_DEPENDS
+  RELATIVE "${PROJECT_SOURCE_DIR}" "../src/*pp")
 
 add_custom_command(OUTPUT ${potfile}
   COMMAND "${XGETTEXT_CMD}"
@@ -24,7 +25,7 @@ add_custom_target(${PROJECT_NAME}_pot
 unset(po_src_files)
 unset(po_src_files_relative)
 
-file(GLOB po_files "*.po")
+file(GLOB po_files CONFIGURE_DEPENDS "*.po")
 
 # Hack to prevent GETTEXT_CREATE_TRANSLATIONS from updating the .po files.
 set(backup_GETTEXT_MSGMERGE_EXECUTABLE ${GETTEXT_MSGMERGE_EXECUTABLE})