Sorry, I meant to keep this on the mailing list. Hit reply without checking.
On Thu, Jun 5, 2014 at 1:33 PM, Andrew Fuller <mactalla.ob...@gmail.com> wrote: > A non-trivial overhaul of the graphviz option implementation will >> be needed to make it useful on projects using modern features. >> > > Okay, I understand. > > As I've continued to investigate this I think my issue is actually deeper. > > When setting compiler definitions I can set a list within a generator > expression and the entire set is handled correctly. > > eg: > target_compile_definitions( my_target PRIVATE > $<$<PLATFORM_ID:Windows>:winone;wintwo> > $<$<PLATFORM_ID:Linux>:linuxone;linuxtwo> ) > gives -Dlinuxone -Dlinuxtwo on the command line under Linux. > > However, trying to do the same with target_link_libraries yields different > results: > target_link_libraries( my_target PRIVATE > $<$<PLATFORM_ID:Windows>:win.1;win.2> > $<$<PLATFORM_ID:Linux>:lin.1;lin.2> ) > gives a link line of -lwin.2 -llin.1 -llin.2 > > As I was experimenting I discovered that $<JOIN:...> provides an > interesting perspective into the issue: > target_link_libraries( my_target PRIVATE > $<$<PLATFORM_ID:Windows>:$<JOIN:win.1;win.2, -I>> > $<$<PLATFORM_ID:Linux>:lin.1;lin.2> ) > gives a link line of -llin.1 -llin.2 > $<JOIN...> seems to correctly group the list so the elements don't leak > out of the generator expression. At least when the condition evaluates to > 0. > > However, > target_link_libraries( my_target PRIVATE > $<$<PLATFORM_ID:Windows>:$<JOIN:win.1;win.2, -I>> > $<$<PLATFORM_ID:Linux>:$<JOIN:lin.1;lin.2, -l>> ) > Gives > CMake Error: > > Error evaluating generator expression: > > $<JOIN:lin.1> > > $<JOIN> expression requires 2 comma separated parameters, but got 1 > instead. > > It appears in this instance as though the list is being split before the > generator expression is being evaluated. $<JOIN...> seems to function as > expected when used in target_compile_definitions. > > Is there a limitation in target_link_libraries I should be aware of? I > didn't find anything obvious in the documentation. > I should mention I'm running 3.0.0-rc3 and set cmake_policy( VERSION 3.0 ). > > Thanks, > -Andrew > > >
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