[CMake] INSTALL CODE Error Results and Termination

[David Hauck]

Hi Jean-christophe,
 
On chris.fillionr at kitware.com], Jean-Christophe Fillion-Robin wrote:
> Hi David,
> 
> You need to escape the "$" sign otherwise the "_err", "_out" and "_res"
> variables are resolved to an empty string.
> 
> Here is an example of what you could do:
> -------------8<-----------8<----------
> cmake_minimum_required(VERSION 2.8.9)
> 
> install(CODE "execute_process (
>       COMMAND ${CMAKE_COMMAND} -E echo \"Hello\"
>       OUTPUT_VARIABLE _out
>       ERROR_VARIABLE _err
>       RESULT_VARIABLE _res
>       )"
>    )
> install(CODE "message( STATUS \"out: \${_out}, err: \${_err}, res:
> \${_res}...\")") -------------8<-----------8<----------

Aha! This was probably obvious to you and Kornel, but it "escaped" me ;). Brilliant, this is working fine now.

Thanks to both of you for your help,
-David
 
> Hth
> Jc
> 
> On Wed, Nov 13, 2013 at 2:29 PM, David Hauck <davidh at netacquire.com>
> wrote:
> 	Hi Kornel,
> 
> 	On Wednesday, November 13, 2013 11:08 AM, cmake- bounces at cmake.org
> wrote: 	> Am Mittwoch, 13. November 2013 um 18:41:03, schrieb David
> Hauck 	> <davidh at netacquire.com> 	>> Hi Kornel, 	>> 	>> On Wednesday,
> November 13, 2013 10:26 AM, cmake- 	> bounces at cmake.org wrote: 	>>> Am
> Mittwoch, 13. November 2013 um 18:12:26, schrieb David Hauck 	>>>
> <davidh at netacquire.com> 	>>>> Hello, 	>>>> 	>>>> I've been using several
> "install (CODE "EXECUTE_PROCESS ...")" 	>>>> constructs 	>>> in my
> top-level CMakeLists.txt file. However, I've been unable to 	>>>
> capture/operate on any exit status of the embedded command. 	>>>
> Unfortunately, documentation/searches haven't turned up any useful 	>>>
> pointers. The closest I've come is a pointer in the following thread:
> 	>>>> http://www.cmake.org/pipermail/cmake/2011- July/045475.html
> However, 	>>>> I've not been able to sufficiently read between the lines
> to get 	>>>> this working. 	>>>> 	>>>> Does anyone have any thoughts on
> how to get something like the 	>>>> following working: 	>>>> 	>>>>   
> install (CODE "EXECUTE_PROCESS ( 	>>>>       COMMAND ant ... 	>>>>      
> WORKING_DIRECTORY ${PROJECT_SOURCE_DIR}/java 	>>>>       ERROR_VARIABLE
> _err 	>>> 	>>> Didn't you mean 'RESULT_VARIABLE' here? 	>> 	>> No, I
> really do mean ERROR_VARIABLE (unless, of course, this variable 	>> does
> 	> not include the non-zero exit status of the EXECUTE_PROCESS
> command?). 	> 	> If you run 'cmake --help-command execute_process', you
> see: ... If 	> RESULT_VARIABLE is given the variable will be set to
> contain the 	> result of running the processes.  This will be an integer
> return code 	> from the last child or a string describing an error
> condition. ... So, 	> if this is not "0", then you have an error
> condition.
> 
> 	Yes, I see this. I also assumed that the ERROR_VARIABLE would be
> returning non-zero text as well in this case. I will change to using
> RESULT_VARIABLE, but, in both cases, it seems that I'm referencing the
> variable incorrectly (either syntactically or in the incorrect
> context) since this/these is/are always <empty>.
> 
> 	>> BTW, I'm still curious about the (dual 'code') construct generally.
> 	>> Specifically, if I do the following I never see the fatal error 	>>
> message (so I'm wondering if there's still something wrong regarding 	>>
> the scoping of the message command)? 	>> 	>>    install (CODE
> "EXECUTE_PROCESS ( 	>>       COMMAND ant ... 	>>       WORKING_DIRECTORY
> ${PROJECT_SOURCE_DIR}/java 	>>       ERROR_VARIABLE _err 	>>    ) 	>>   
> MESSAGE( FATAL_ERROR \"err: ${_err}\") 	> 	> Never did this. When do you
> want to see the message?
> 
> 	Ideally, I want to be able to test for the result of this variable
> (either ERROR_VARIABLE or RESULT_VARIABLE) after the execute_process
> command completes (during 'make install') to determine its result and
> to terminate (with error message) when the command fails.
> 
> 	Thanks,
> 	-David
> 
> 	> As I understand your code, only in call of cmake, e.g. at
> configuration time.
> 	>
> 	>       Kornel