[CMake] CmakeLists chain cannot find source added with add_custom_command

[J Decker]

It is not generated; because it is generated during a the build phase not
the generate phase.  So only the logical idea of the file exists.

On Sun, Jul 2, 2017 at 12:12 AM, Eric Noulard <eric.noulard at gmail.com>
wrote:

> Needless to say that your example should work but somehow CMake does not
> see that the referred file is GENERATED.
>
> Le 2 juil. 2017 09:11, "Eric Noulard" <eric.noulard at gmail.com> a écrit :
>
>> Is the referred file created?
>> Does your actual command creating the file doing it in the source tree
>> and not in the build tree?
>> Are you building in-source or out of source?
>>
>> Could you give us us a toy example which shows the issue?
>>
>> Le 2 juil. 2017 04:32, "J Decker" <d3ck0r at gmail.com> a écrit :
>>
>> Known issue?  Or just doesn't require a response?
>>
>> On Wed, Jun 28, 2017 at 6:05 AM, J Decker <d3ck0r at gmail.com> wrote:
>>
>>> I have this chain of makefiles.  It adds a custom rule to build a source
>>> file, and then a subdirectory cannot reference that file.
>>>
>>> The first is added custom rule for M:/tmp/cmake-chain/sub/src/sack.c
>>> and then later cannot find M:/tmp/cmake-chain/sub/src/sack.c
>>> though it's really referencing it as M:/tmp/cmake-chain/sub/sub2
>>> /../src/sack.c
>>>
>>> tested with 3.6.0-rc4 and 3.9.0-rc5
>>>
>>> if the add_custom_rule and add_executable are in the same makefile even
>>> if there's a added path to make it not exactly the same source as the
>>> 'referencing source' message logs; it works.
>>>
>>>
>>> --- CMakeLists.txt ---
>>> cmake_minimum_required(VERSION 2.8)
>>>
>>> message( "Adding custom rule for ${CMAKE_CURRENT_SOURCE_DIR}/src/sack.c"
>>> )
>>>   add_custom_command( OUTPUT ${CMAKE_CURRENT_SOURCE_DIR}/src/sack.c
>>>   COMMAND cmake -E echo do something to make src/sack.c
>>>   )
>>> add_subdirectory( sub2 )
>>> -------------------------------------
>>>
>>> --- sub2/CmakeLists.txt ---
>>> message( "referencing source ${CMAKE_CURRENT_SOURCE_DIR}/../src/sack.c"
>>> )
>>> add_executable( something ${CMAKE_CURRENT_SOURCE_DIR}/../src/sack.c )
>>>
>>> -------------------------------------
>>>
>>> --- Truncated output log ------
>>> Adding custom rule for M:/tmp/cmake-chain/sub/src/sack.c
>>> referencing source M:/tmp/cmake-chain/sub/sub2/../src/sack.c
>>> -- Configuring done
>>> CMake Error at sub2/CMakeLists.txt:3 (add_executable):
>>>   Cannot find source file:
>>>
>>>     M:/tmp/cmake-chain/sub/src/sack.c
>>>
>>>   Tried extensions .c .C .c++ .cc .cpp .cxx .m .M .mm .h .hh .h++ .hm
>>> .hpp
>>>   .hxx .in .txx
>>> --------------------------------------
>>>
>>>
>>> ------ Flat CmakeLists.txt which works ---------------
>>> cmake_minimum_required(VERSION 2.8)
>>>
>>> message( "Adding custom rule for ${CMAKE_CURRENT_SOURCE_DIR}/src/sack.c"
>>> )
>>>   add_custom_command( OUTPUT ${CMAKE_CURRENT_SOURCE_DIR}/src/sack.c
>>> COMMAND cmake -e echo make file.
>>>   )
>>>
>>> message( "referencing source ${CMAKE_CURRENT_SOURCE_DIR}/src/sack.c" )
>>> add_executable( something ${CMAKE_CURRENT_SOURCE_DIR}/sub2/../src/sack.c
>>> )
>>> --------------------------------------
>>>
>>> ----- flat cmakelists output.... -----------
>>> Adding custom rule for M:/tmp/cmake-chain-flat/src/sack.c
>>> referencing source M:/tmp/cmake-chain-flat/sub2/../src/sack.c
>>> -- Configuring done
>>> --------------------------------------
>>>
>>>
>>
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