The target_link_libraries() command would be in the CMakeLists.txt for library A, not the one for your executable. The one for your executable would just say target_link_libraries(myExe A). And cmake would automatically know that linking with A also means linking with png.<br>
<br>You say that you have 2 different versions of library A. Does this mean that you have 2 separate CMakeLists.txt files, one for each variant of A. Or are both variants built by the same CMakeLists.txt ? Either way, I would have thought that you could add the appropriate target_link_libraries() command. Can you describe your current setup in a bit more detail to explain why this approach won't work ?<br>
<br><div class="gmail_quote">On 11 August 2011 14:02, Doug <span dir="ltr"><<a href="mailto:douglas.linder@gmail.com">douglas.linder@gmail.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex;">
<span style="color:rgb(51, 51, 51);font-family:arial, sans-serif;font-size:13px;background-color:rgb(255, 255, 255)"><div class="im">How can I achieve that _without_ editing my own cmake file?<div><br></div>
<div>What if a swap in a different library for my executable that is abi compatible but uses a different implemented to load images? </div><div><br></div><div>I'm not talking hypotheticals here: I literally have two versions of the library that use slightly different versions of libpng (one for desktop and one for android) and it's extremely inconvenient to be messing around with my cmake file every time I change my build target.</div>
<div><br></div><div>Sure I can do a giant IF(TARGET MATCHES "Android") ... ENDIF, which I guess is what I will do for now, but it seems like a poor solution.</div><div><br></div></div><div>Edit: woops; ment that to go to the list.</div>
<div><br></div><div>~</div><div>Doug.</div><font color="#888888"><div><br></div></font></span><div class="gmail_quote"><div class="im">On Thu, Aug 11, 2011 at 7:39 PM, Glenn Coombs <span dir="ltr"><<a href="mailto:glenn.coombs@gmail.com" target="_blank">glenn.coombs@gmail.com</a>></span> wrote:<br>
</div><div><div></div><div class="h5"><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">Add the sub dependencies that library A has with target_link_libraries():<br><br>
target_link_libraries(A png)<br><br>
--<br>Glenn<br><br><div class="gmail_quote"><div><div></div><div>On 11 August 2011 10:02, Doug <span dir="ltr"><<a href="mailto:douglas.linder@gmail.com" target="_blank">douglas.linder@gmail.com</a>></span> wrote:<br>
</div></div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div><div></div><div>Hrm... this seems like something cmake should be able to do, but I don't know how to make it work.<div>
<br></div><div>
If I have library A, that depends on a library and an executable project that depends on library A, how can the executable project resolve the sub dependencies from A?</div>
<div><br></div><div>Specifically libpng in my case:</div><div><br></div><div>I have a library that depends on libpng.</div><div><br></div><div>I run cmake to build the library no problem.</div><div><br></div><div>Then I try to compile a program that depends on the library and get a heap of errors like:</div>
<div><br></div><div><div> undefined reference to `png_set_read_fn'</div></div><div> etc. etc.</div><div><br></div><div>Presumably this is something about how I depend on the library? I'm using the LibFindMacros, so my cmake module looks like this for the library:</div>
<div><br></div><div><div>include(LibFindMacros)</div><div><br></div><div>find_path(LIBNW_INCLUDE_DIR NAMES nw.h PATHS ${LIBNW_PKGCONF_INCLUDE_DIRS})</div><div><br></div><div>find_library(LIBNW_LIBRARY NAMES nw PATHS ${LIBNW_PKGCONF_LIBRARY_DIRS})</div>
<div><br></div><div>set(LIBNW_PROCESS_INCLUDES LIBNW_INCLUDE_DIR)</div><div>set(LIBNW_PROCESS_LIBS LIBNW_LIBRARY LIBNW_LIBRARIES)</div><div><br></div><div>libfind_process(LIBNW)</div></div><div><br></div><div> I know I can use ADD_SUBDIRECTORY to include stuff for a sub dir, but that isn't really appropriate in this case.</div>
<div><br></div><div>~</div><div>Doug.</div>
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