Re: [Plplot-devel] tcl build problem

[Alan W. I. <ir...@be...>]

On 2014-08-29 02:08-0700 phil rosenberg wrote:

> Hi Alan
> I have cured the actual link errors - I was trying to link 64 bit tcl libraries into 32 bit plplot examples - obviously it didn't work.
>

> The only real issue left is the appended .lib outside the quotes. I
can't find if that is something that we do or something that CMake
does. I expected to find a TARGET_LINK_LIBRARIES call with either
items from DRIVERS_LINK_FLAGS or ntk_LINK_FLAGS somewhere, but I can't
find it.

Hi Phil:

Because of your subscription concerns which I discussed with you off
list, I am going to send this to you twice as a test of your
subscription; once via the list and once only to you.  So if you
get two duplicate e-mails you know all is well with your subscription.

That's excellent news that you whittled down all build system issues
for your MSVC platform to just one, the appended .lib.  I would like
to google for that issue (in case it is a CMake bug rather than a
bug in our particular build system implementation).  So I need to
know the exact CMake generator and MSVC version that you are using.

Also, if you are not currently using the -G"NMake Makefiles"
generator, I would switch to that one to see if the problem
disappears.  And also switch to the latest CMake 2.8.x version which
is currently 2.8.12.2.  The reason I suggest these two changes is that
the various Windows IDE generators are notoriously buggy compared to
the NMake generator, but 2.8.12.2 gives you the best chance of being
bug free amongst all the CMake-2.8.x alternatives. (Note that the
lastest stable CMake now is version 3.0.1, but our build system is not
really ready for CMake-3.0.x which is why I have suggested trying the
latest CMake in the 2.8.x.y series.)

With those preliminaries out of the way, it is now time to actually
answer your specific question above.  :-)

ntk_LINK_FLAGS is used in the loop through all drivers that occurs in
drivers/CMakeLists.txt.

In that file, look for

if(ENABLE_DYNDRIVERS)
[...]
foreach(SOURCE_ROOT_NAME ${DRIVERS_LIST})

where DRIVERS_LIST includes ntk so later in
the logic ${SOURCE_ROOT_NAME}_LINK_FLAGS
corresponds to ntk_LINK_FLAGS.  Thus, if you uncomment

#message("${SOURCE_ROOT_NAME}_LINK_FLAGS = ${${SOURCE_ROOT_NAME}_LINK_FLAGS}")
and
#message("${SOURCE_ROOT_NAME}_TARGETS = ${${SOURCE_ROOT_NAME}_TARGETS}")

those will help you to see what is going on.  Also, later on in that
loop logic for the non-qt case you will see the following logic:

       add_library(${SOURCE_ROOT_NAME} MODULE ${${SOURCE_ROOT_NAME}_SOURCE})
       target_link_libraries(
         ${SOURCE_ROOT_NAME}
         plplot${LIB_TAG}
         ${MATH_LIB}
         ${${SOURCE_ROOT_NAME}_LINK_FLAGS}
         ${${SOURCE_ROOT_NAME}_TARGETS}
         )

Note, in this case ${SOURCE_ROOT_NAME}_LINK_FLAGS should be a CMake
list, i.e., output in message in the form "a;b;c" where a, b, and c
are the elements of the list that should get translated on the command
line (revealed by the VERBOSE=1 option) to a space-separated list of
linker options)

However, if your message output for ${SOURCE_ROOT_NAME}_LINK_FLAGS and
${SOURCE_ROOT_NAME}_TARGETS doesn't show anything peculiar, then my
bet is you are running into some kind of CMake bug for the particular
CMake version and generator that you are using which motivates my
suggestion above to move to the most bug-free version of CMake-2.8.x.y
as well as the NMake generator (which typically is more reliable than
any of the Windows IDE generators).

Alan
__________________________
Alan W. Irwin

Astronomical research affiliation with Department of Physics and Astronomy,
University of Victoria (astrowww.phys.uvic.ca).

Programming affiliations with the FreeEOS equation-of-state
implementation for stellar interiors (freeeos.sf.net); the Time
Ephemerides project (timeephem.sf.net); PLplot scientific plotting
software package (plplot.sf.net); the libLASi project
(unifont.org/lasi); the Loads of Linux Links project (loll.sf.net);
and the Linux Brochure Project (lbproject.sf.net).
__________________________

Linux-powered Science
__________________________