[cmake-developers] CMake instances sharing some modifiable resources

[Robert Goulet]

Hi all,

I'm trying to write a custom command that will run a CMake script to add some content in a file. Problem is, if I'm building with multiple process enabled in Visual Studio project, and the custom command is added to a few different CMakeLists.txt files, I get synchronizations issues.

In my a bunch of CMakeLists.txt I have:

add_custom_command(TARGET ${PROJECT_NAME} POST_BUILD COMMAND ${CMAKE_COMMAND} ARGS -P "file_append.cmake")

In file_append.cmake I have:

file(APPEND "output.txt" "some content\n")

When looking at the content of output.txt, we see that some lines are truncated, half-written or skipped entirely. Is there a way to make the file command lock the file during the append so that multiple process sharing some modifiable resource do not run into conflict between each other? I saw the file(LOCK...) command but it doesn't seems to work for this case?

Thanks!
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