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

[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 at gmail.com> 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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