[CMake] CMake:question of the time when the command will happen in add_custom_command(...)

[Chaos Zhang]

Sorry for i just know reply by email and thinks for your help again. :-)


Petr Kmoch wrote
> No, it is indeed compiled and linked just fine. What I meant is:
> 
> Without any custom commands, the build process conceptually looks like
> this:
> 
> buildMain() {
>   compile_object_files();
>   link_main_binary();
> 
>   message("Built target main");
> }
> 
> With a post-build custom command:
> 
> buildMain() {
>   compile_object_files();
>   link_main_binary();
>   post_build_command();
> 
>   message("Built target main");
> }
> 
> The custom command becomes a part of the entire process of "Building
> target," that's why the "Built target" message appears after the command
> runs.
> 
> BTW, please keep the mailing list in copy when replying.
> 
> Petr
> 
> On 22 April 2016 at 10:02, Chaos Zhang <

> zcsd2012@

> > wrote:
> 
>> So what you mean is the target have not been complied and linked after i
>> introduce
>> custom commands into this target right? Do i understand right?
>>
>> Thanks a lot for your generous help. :-)
>>
>> 2016-04-22 16:38 GMT+08:00 Petr Kmoch <

> petr.kmoch@

> >:
>>
>>> Hi,
>>>
>>> the reason is that the post-build command is actually a part of building
>>> "main the target." Once you introduce custom commands into a target,
>>> building it includes them all, and not just compiling the object files
>>> and
>>> linking the binary. You will notice that the "Linking C exectuable main"
>>> line came before the post-build message, so it did happen in the correct
>>> order.
>>>
>>> Petr
>>>
>>> On 22 April 2016 at 06:25, Chaos Zhang <

> zcsd2012@

> > wrote:
>>>
>>>> Hi all,
>>>>
>>>> I have some trouble when i use PRE_BUILD | PRE_LINK | POST_BUILD in
>>>> command
>>>> "add_custom_command(...)". When i use POST_BUILD, i found the command
>>>> will
>>>> execute before target had been built, like this:
>>>>
>>>> 1 [root at VM_33_35_centos build]# make
>>>> 2 Scanning dependencies of target main
>>>> 3 [100%] Building C object CMakeFiles/main.dir/main.c.o
>>>> 4 Linking C executable main
>>>> 5 This is pre build
>>>> 6 This is post build
>>>> 7 [100%] Built target main
>>>>
>>>> In my CMakeLists.txt, the content is:
>>>>  1 cmake_minimum_required(VERSION 2.8)
>>>>  2 add_executable(main main.c)
>>>>  3 add_custom_command(TARGET main
>>>>  4                     PRE_BUILD
>>>>  5                     COMMAND echo "This is pre build "
>>>>  6         )
>>>>  7 add_custom_command(TARGET main
>>>>  8                     POST_BUILD
>>>>  9                     COMMAND echo "This is post build"
>>>>  10         )
>>>>
>>>> Why the command echo "This is post build" in 8 line(CMakeLists.txt) did
>>>> not
>>>> execute after [100%] Built target main in 7 line(Linux command)?
>>>>
>>>>
>>>>
>>>>
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>>>
>>>
>>
> 
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> 
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> 
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