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

[Craig Scott]

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 <dearvoid at gmail.com> wrote:

> On Tue, Apr 19, 2016 at 1:15 PM, Chaos Zhang <zcsd2012 at gmail.com> 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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>> Sent from the CMake mailing list archive at Nabble.com.
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>
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>
> Powered by www.kitware.com
>
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-- 
Craig Scott
Melbourne, Australia
http://crascit.com
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