Re: [CMake] Build-system dependency (as opposed to target)

[James Turner]

> On 9 Jun 2016, at 09:51, Petr Kmoch  wrote:
> 
> I believe you're looking for the directory property CMAKE_CONFIGURE_DEPENDS ( 
> https://cmake.org/cmake/help/latest/prop_dir/CMAKE_CONFIGURE_DEPENDS.html ). 
> Adding a file path to that property causes any changes to that file to 
> trigger a regeneration:
> 
>   set_property(DIRECTORY APPEND PROPERTY CMAKE_CONFIGURE_DEPENDS version)
> 
> If you are using CMake old enough not to have this property, an alternative 
> workaround is to run configure_file() on the file (even if you never use the 
> configured result). This will introduce the exact same dependency.

That is indeed exactly what I needed, I am trying to figure out if I would ever 
have got that from Googling. I never think of ‘running Cmake again’ as 
‘configure’ but it makes sense now you pointed it out.

Thank you again,
James



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Re: [CMake] Build-system dependency (as opposed to target)

[Petr Kmoch]

Hi James,

I believe you're looking for the directory property CMAKE_CONFIGURE_DEPENDS
( https://cmake.org/cmake/help/latest/prop_dir/CMAKE_CONFIGURE_DEPENDS.html
). Adding a file path to that property causes any changes to that file to
trigger a regeneration:

  set_property(DIRECTORY APPEND PROPERTY CMAKE_CONFIGURE_DEPENDS version)

If you are using CMake old enough not to have this property, an alternative
workaround is to run configure_file() on the file (even if you never use
the configured result). This will introduce the exact same dependency.

Petr
​
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[CMake] Build-system dependency (as opposed to target)

[James Turner]

Hi,

Is there a way to make the entire build-system depend on a file? I have some 
data I’m reading into my CMakeList.txt via file(READ), and I want changes to 
that file to effectively act as if the CMakeList.txt itself was modified.

The read values are used to populate some variables via string parsing, which 
is then used in generated headers and a few other places:

> # read 'version' file into a variable (stripping any newlines or spaces)
> file(READ version versionFile)
> string(STRIP ${versionFile} FOO_VERSION)

The file is part of the source distribution alongside the build-system, it’s 
not user-supplied or anything complex like that.

Right now changes to the file contents don’t trigger the downstream variables 
being updated.

Kind regards,
James



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