[CMake] add_custom_command(TARGET ..) does nothing if target don't exist?

[David Cole]

That seems like add_custom_command should fail with an error when the
named target does not exist. (I have never noticed this, because I
never use that signature of add_custom_command...)


On Tue, Aug 30, 2011 at 12:45 PM, Johan Björk <phb at spotify.com> wrote:
> Hi guys,
> I just ran into the following issue, and I'm quite baffled? Is this really
> expected behaviour?
> cherimoya:cmake-postbuildearly phb$ cat CMakeLists
> ADD_CUSTOM_COMMAND(TARGET foo POST_BUILD COMMAND ${CMAKE_COMMAND} -E echo
> 'hello')
> TARGET_LINK_LIBRARIES(foo "-lbar")
> cherimoya:cmake-postbuildearly phb$ cat CMakeLists.txt
> cmake_minimum_required(VERSION 2.8)
> ADD_CUSTOM_COMMAND(TARGET foo POST_BUILD COMMAND ${CMAKE_COMMAND} -E echo
> 'hello')
> FILE(WRITE foo.c "")
> ADD_LIBRARY(foo foo.c)
> FILE(WRITE bar.c "")
> ADD_LIBRARY(bar bar.c)
> ADD_CUSTOM_COMMAND(TARGET bar POST_BUILD COMMAND ${CMAKE_COMMAND} -E echo
> 'hello')
>
> <after generation, makefile or xcode generator doesn't matter>
> cherimoya:cmake-postbuildearly phb$ grep -R hello *
> CMakeFiles/bar.dir/build.make: /usr/local/Cellar/cmake/2.8.5/bin/cmake -E
> echo 'hello'
> CMakeLists:ADD_CUSTOM_COMMAND(TARGET foo POST_BUILD COMMAND ${CMAKE_COMMAND}
> -E echo 'hello')
> CMakeLists.txt:ADD_CUSTOM_COMMAND(TARGET foo POST_BUILD COMMAND
> ${CMAKE_COMMAND} -E echo 'hello')
> CMakeLists.txt:ADD_CUSTOM_COMMAND(TARGET bar POST_BUILD COMMAND
> ${CMAKE_COMMAND} -E echo 'hello')
> ie, it simply ignores the custom command for when the target does not yet
> exist!
>
> /Johan
>
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