Avoid .la files getting removed on "make clean"

These are generated during the cmake stage, but cmake thinks they are
generated during the build stage because of our rule to update the
timestamp on them. As a result, it thinks they should be removed when
doing "make clean".

There doesn't seems to be an easy way to tell cmake to leave these
alone. So instead, point cmake to a different marker file when updating
the timestamps. We don't care if that gets removed as it has no valuable
contents.

diff --git a/cmake/Modules/CMakeMacroLibtoolFile.cmake b/cmake/Modules/CMakeMacroLibtoolFile.cmake
index 12ba99092e98c0bee0b47b6784b574d3f1af3cd3..1c7cb93da638b945360c28c5a453b1b7abfb27ad 100644 (file)
--- a/cmake/Modules/CMakeMacroLibtoolFile.cmake
+++ b/cmake/Modules/CMakeMacroLibtoolFile.cmake
@@ -180,8 +180,10 @@ function(libtool_generate_control_file _target)
   file(APPEND ${_laname} "libdir='/usr/lib'\n\n")
 
   # Make sure the timestamp is updated to trigger other make invocations
-  add_custom_command(OUTPUT "${_laname}" DEPENDS ${_target}
+  set(_lamarker ${_binary_dir}/.${_lname}.la.fresh)
+  add_custom_command(OUTPUT "${_lamarker}" DEPENDS ${_target}
     COMMENT "Updating timestamp on ${_lname}.la"
+    COMMAND "${CMAKE_COMMAND}" -E touch "${_lamarker}"
     COMMAND "${CMAKE_COMMAND}" -E touch "${_laname}")
 
   # Add custom command to symlink the static library so that autotools finds
@@ -193,5 +195,5 @@ function(libtool_generate_control_file _target)
     COMMAND "${CMAKE_COMMAND}" -E create_symlink ../${_lname}${CMAKE_STATIC_LIBRARY_SUFFIX} "${_libname}")
 
   add_custom_target(${_target}.la ALL
-    DEPENDS "${_laname}" "${_libname}")
+    DEPENDS "${_lamarker}" "${_libname}")
 endfunction()