On 17. Jun, 2009, at 1:22, Mark Lohry wrote:
Thanks for the reply.
I added "add_dependencies( lib1 lib2 )", "add_dependencies( lib2
lib1 )",
and "add_dependencies( execthing lib1 lib2 )" in their appropriate
places,
and changed the libraries to STATIC, but no change.
First off, you're creating a cyclic dependency between lib1 and lib2.
Never a good thing. Second, how do your libraries relate to each
other? Does lib2 use symbols from lib1? Or is it the other way round?
If lib1 uses symbols from lib2 and lib2 from lib1, you have a design
issue.
For the moment, assume that lib2 uses symbols from lib2, in that case
in lib/lib2/CMakeLists.txt you would do:
include_directories( ${proj_SOURCE_DIR}/lib )
set( lib2_SRCS
..... bunch of c++ sources )
add_library( lib2 SHARED ${lib2_SRCS} )
# THIS ONE IS IMPORTANT!
target_link_libraries( lib2 lib1 )
The target_link_libraries command automatically adds a dependency of
lib2 on lib1.
Yes, everything compiles when i build the libraries and executables
separately; it fails on the link step after this, with "undefined
reference"
to every library function used.
Is this Windows or some kind of Unix system? If the former, have you
exported your symbols in the library using __declspec(dllexport)? You
can get started here: http://msdn.microsoft.com/en-us/library/9h658af8.aspx
and http://msdn.microsoft.com/en-us/library/9h658af8.aspx
I'm unfamiliar with 'nm', can you be more specific as to what I
should be
looking for?
Again, are you using Windows? In that case the tool you're looking for
is dumpbin.exe (http://msdn.microsoft.com/en-us/library/c1h23y6c(VS.80).aspx
), especially the options /SYMOBOLS and /EXPORTS should be of interest.
HTH
Michael
On Tue, Jun 16, 2009 at 4:55 PM, Tyler Roscoe <[email protected]>
wrote:
On Tue, Jun 16, 2009 at 03:41:51PM -0500, Mark Lohry wrote:
I have a number of subdirectories, each containing source to be
built
into
their own libraries, which contain many interdependencies. I'm
trying to
build an executable to link against these libraries, and I'm
getting a
console full of "undefined reference to..." errors on linking
step. The
libraries and executable source all compile individually without
issue.
Structure is like so:
# top-level CMakeLists.txt
project( proj )
ADD_SUBDIRECTORY( lib )
ADD_SUBDIRECTORY( src )
# /lib/CMakeLists.txt
ADD_SUBDIRECTORY( lib1 )
ADD_SUBDIRECTORY( lib2 )
# /lib/lib1/CMakeLists.txt
include_directories( ${proj_SOURCE_DIR}/lib )
set( lib1_SRCS
..... bunch of c++ sources )
add_library( lib1 SHARED ${lib1_SRCS} )
# /lib/lib2/CMakeLists.txt
include_directories( ${proj_SOURCE_DIR}/lib )
set( lib2_SRCS
..... bunch of c++ sources )
add_library( lib2 SHARED ${lib2_SRCS} )
# src/CMakeLists.txt
include_directories( ${proj_SOURCE_DIR}/lib )
set( execthing_SRCS
.... bunch of C++ sources )
add_executable( execthing ${execthing_SRCS} )
target_link_libraries( execthing lib1 lib2 )
This all looks reasonable to me, so the devil is probably in the
details. Are you sure all your paths make sense? Can you use nm or
dumpbin or whatever to see the "undefined" symbols in the libraries
where you expect to find them?
So if you build the libraries individually and then build the
executable
individually, everything works? You might try playing with some
explicit
add_dependencies() to see if there's some kind of build order
problem.
CMake should be smart enough to figure this out from your
target_link_libraries, but maybe you have something strange going on
under the covers?
tyler
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