[CMake] CPack OS X bundle : generator expression for CPACK_BUNDLE_STARTUP_COMMAND

[Oleksii Vilchanskyi]

Hi,

`set()` is evaluated at configuration time and as of CMake 3.10 does not
accept genexps. You can refer to this diagram for better understanding
of the general CMake pipeline:
<https://cgold.readthedocs.io/en/latest/_images/cmake-environment.png>

Therefore,

>   SET ( APP_LOCATION "$<TARGET_FILE:myapp>" )
>   SET ( CPACK_BUNDLE_STARTUP_COMMAND ${APP_LOCATION} )

is interpreted exactly how it's written:

> CPack Error: Error copying $<TARGET_FILE:myapp> to...

Due to this limitation your [probably] sole option to introduce genxps
in CPack config would be to use `file(GENERATE)`. Otherwise, use
single-configuration generators and you won't have
configuration-dependent paths.

On 29.11.2017 01:50, Nicholas Yue wrote:
> I am using CMake 3.10
> 
> I can't seems to find a way to tell the OS X bundle where to find the
> compiled binary.
> 
> I get the following errors:
> 
> Run CPack packaging tool...
> CPack: Create package using Bundle
> CPack: Install projects
> CPack: - Run preinstall target for: OSXBundle
> CPack: - Install project: OSXBundle
> CPack: Create package
> CPack Error: Error copying $<TARGET_FILE:myapp> to
> /Users/nicholas/projects/OSX_BundleRPath/build/_CPack_Packages/Darwin/Bundle/OSXBundle-0.1.1-Darwin/MyApp.app/Contents/MacOS/MyApp
> CPack Error: Error copying startup command.  Check the value of
> CPACK_BUNDLE_STARTUP_COMMAND.
> CPack Error: Problem compressing the directory
> CPack Error: Error when generating package: OSXBundle
> make: *** [package] Error 1
> 
> 
> I have the following CMakeLists.txt:
> 
> CMAKE_MINIMUM_REQUIRED(VERSION 3.8)
> 
> PROJECT (OSXBundle)
> 
> FIND_PACKAGE (Boost REQUIRED)
> 
> ADD_EXECUTABLE (myapp
>   src/main.cpp
>   )
> 
> INSTALL ( TARGETS
>   myapp
>   DESTINATION
>   ./bin
>   )
> 
> IF (APPLE)
>   # GET_TARGET_PROPERTY ( APP_LOCATION myapp LOCATION )
>   SET ( APP_LOCATION "$<TARGET_FILE:myapp>" )
>   
>   SET ( CPACK_BUNDLE_NAME "MyApp" )
>   
>   SET ( CPACK_GENERATOR "Bundle" )
>   SET ( CPACK_BUNDLE_PLIST
> ${CMAKE_CURRENT_SOURCE_DIR}/resources/Info.plist )
>   SET ( CPACK_BUNDLE_ICON ${CMAKE_CURRENT_SOURCE_DIR}/resources/MyApp.icns )
>   SET ( CPACK_PACKAGE_ICON
> ${CMAKE_CURRENT_SOURCE_DIR}/resources/MyApp.icns )
>   SET ( CPACK_BUNDLE_STARTUP_COMMAND ${APP_LOCATION} )
> ENDIF ()
> 
> INCLUDE ( CPack )
> 
> 
> 

-- 
Regards,
Oleksii Vilchanskyi
PGP:0x8D3A0E046BDE941F2A53867CE3FD952D48C0B338

***
All the world's a pipeline,
And all the men and women merely instructions.

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