[CMake] CMake: how to use 'if condition' in command add_custom_command(...)

Tue Apr 19 05:44:02 EDT 2016

On Tue, Apr 19, 2016 at 4:55 PM, Chaos Zhang <zcsd2012 at gmail.com> wrote:

> I have read the description of PRE_BUILD before in CMake doc, but when i
> use it, i found something confuesed.
> (1) In CMakeLists.txt, the content as below：
>
> (2)After i make the makefile generated by this CMakeLists.txt, i get
> result as below:
> "3_pre_build" is behind "1_pre_link", if POST_BUILD gets treated as
> PRE_LINK, why "3_pre_build" was printed before "1_pre_link"?
>

It's not the order of the "add_custom_command" commands in CMakeLists.txt
which determines in which order they will be invoked. According to the doc:

  PRE_BUILD − run before all other dependencies
  PRE_LINK − run after other dependencies
  POST_BUILD − run after the target has been built

So PRE_BUILD comes first and then PRE_LINK and at last POST_BUILD.

-clark

>
> Thanks for you reply,
> Chaos Zhang
> 
>
> 2016-04-19 15:50 GMT+08:00 Craig Scott-3 [via CMake] <[hidden email]
> <http:///user/SendEmail.jtp?type=node&node=7593283&i=0>>:
>
>> In case it matters, in Clark's suggested code, note that PRE_BUILD is
>> only fully honoured with Visual Studio generators. For everything else, it
>> gets treated as PRE_LINK, which occurs later (i.e. after compiling all the
>> sources rather than before). So it depends on what your "if" test is trying
>> to do whether or not this matters in your case.
>>
>> On Tue, Apr 19, 2016 at 5:24 PM, Clark Wang <[hidden email]
>> <http:///user/SendEmail.jtp?type=node&node=7593281&i=0>> wrote:
>>
>> On Tue, Apr 19, 2016 at 1:15 PM, Chaos Zhang <[hidden email]
>>> <http:///user/SendEmail.jtp?type=node&node=7593281&i=1>> wrote:
>>>
>>>> Hi,
>>>>
>>>> Is there a way to use Linux command 'if' like this :
>>>> <http://cmake.3232098.n2.nabble.com/file/n7593278/2016-04-19_113005.png
>>>> >
>>>> For i need to execute 'if condition' in make phase rather than cmake
>>>> phase.
>>>>
>>>
>>> Try like this:
>>>
>>> % cat CMakeLists.txt
>>> add_custom_target(foo ALL)
>>> add_custom_command(TARGET foo
>>>     PRE_BUILD
>>>     COMMAND if [ -f bar ]\; then echo yes\; else echo no\; fi)
>>> % cmake .
>>> % make
>>> no
>>> Built target foo
>>> % touch bar
>>> % make
>>> yes
>>> Built target foo
>>> %
>>>
>>>
>>>> Thanks a lot
>>>> Chaos Zhang
>>>>
>>>>
>>>>
>>>> --
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>>
>>
>>
>> --
>> Craig Scott
>> Melbourne, Australia
>> http://crascit.com
>>
>> --
>>
>> Powered by www.kitware.com
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