I have come up with a partial solution to this issue by putting the
add_subdirectory into a macro that is called to do the add along with the
add_depend.
It looks for a variable of ${CMAKE_PROJECT_NAME}_BUILT in order to determine if
it should add_subdirectory or just add_depend.
The issue now is that I recieve warnings of overiding commands and ignoring old
commands for the shared dependency.
Let me clarify my earlier post.
My top level project contains 4 projects.
/trunk/a (Only Executable)
/trunk/b
/trunk/c
/trunk/d
To Build, a requires b. b requires c. Both a and c require d.
In a:
project(a)
set(BASEDIR /trunk)
add_subdirectory(${BASEDIR}/b ${CMAKE_BINARY_DIR}/b)
add_subdirectory(${BASEDIR}/d ${CMAKE_BINARY_DIR}/d)
...
In b:
project(a)
set(BASEDIR /trunk)
add_subdirectory(${BASEDIR}/c ${CMAKE_BINARY_DIR}/c)
...
In c:
project(a)
set(BASEDIR /trunk)
add_subdirectory(${BASEDIR}/d ${CMAKE_BINARY_DIR}/d)
...
This method fails due to the same Bin dir being used for d in both c and a.
To solve this, I created a macro that does the following along with adding set
(${CMAKE_PROJECT_NAME}_BUILT 1) to all projects
if(${_name}_BUILT)
add_dependencies(${_target} ${_name})
else()
add_subdirectory(${_src} ${_bin})
add_dependencies(${_target} ${_name})
endif()
The issue that now appears is that project d has the following warnings when
make is ran.
CMakeFiles/Makefile2:76051: warning: overriding commands for target
`trunk/d/CMakeFiles/d.dir/all'
CMakeFiles/Makefile2:64065: warning: ignoring old commands for target
`trunk/d/CMakeFiles/d.dir/all'
CMakeFiles/Makefile2:76063: warning: overriding commands for target
`trunk/d/CMakeFiles/d.dir/rule'
CMakeFiles/Makefile2:64077: warning: ignoring old commands for target
`trunk/d/CMakeFiles/d.dir/rule'
CMakeFiles/Makefile2:76074: warning: overriding commands for target
`trunk/d/CMakeFiles/d.dir/clean'
CMakeFiles/Makefile2:64088: warning: ignoring old commands for target
`trunk/d/CMakeFiles/d.dir/clean'
What would cause this issue in the makefiles?
________________________________
From: cmake-boun...@cmake.org [mailto:cmake-boun...@cmake.org] On Behalf Of
Schwartz, Philip
Sent: Monday, January 25, 2010 4:33 PM
To: cmake@cmake.org
Subject: [CMake] Out of source dependencies.
The current project that I am working on has multiple projects layered through
subdirectories. The project was a conversion from traditional makefiles and
when we do a cmake build from the root of the source tree all is done
correctly. The issue comes to when we try and build a single component from a
out of source build directory (we are requiring out of source builds).
I have found a temp solution for example
/trunk/a
/trunk/b
/trunk/c
a requires b and b requires c to build correctly. As long as they dont share
dependencies, if I use add_subdirectory(src ${CMAKE_BINARY_DIR}/<project>) for
each it works to build the deps as needed. The issue is if both a and c require
the another dep pulled in the same way. The error that comes up is through a
policy error of CMP0013.
Yes, I could disable the policy, but would prefer a more elegant solution for
the issue. Any help would be appreciated.
--Philip
________________________________
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________________________________
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