On 2008-09-17 15:45-0000 Leo Breebaart wrote:
So if the Cache is not the right way to pass information
'sideways' in your build tree, what is? I think I understand (but
please correct if I get it wrong -- I am new to CMake) that if I
call FIND_PACKAGE(TIFF) at a high enough level, i.e. at my top
level CMakeLists.txt, the TIFF_LIBRARIES var will be available to
all 'lower' level directories reached via ADD_SUBDIRECTORY.
Yes, you are correct.
But in this case, it still seems somehow wrong to me not to keep
the check where it belongs, i.e. with the application. But the
library is not a subdir from the application dir (and shouldn't
be -- it may be used elsewhere as well), so I still have that
'passing information sideways' problem. TIFF_INCLUDE_DIR is no
problem, because FIND_PACKAGE(TIFF) *does* put that one in the
cache...
I think you have answered your own question. Determine local things
locally and determine things that are going to be used in more than
one place in a higher level directory.
N.B. to keep our top-level CMakeLists.txt file from getting too cluttered
by general find commands, it is a nice idea to set CMAKE_MODULE_PATH in your
top-level directory, then include files from there.
e.g.,
set(CMAKE_MODULE_PATH ${PROJECT_SOURCE_DIR}/cmake/modules)
include(anyname)
immediately includes CMake commands from cmake/modules/anyname.cmake just as
if they had been typed in the top-level CMakeLists.txt. Furthermore,
anyname.cmake itself can include other files from cmake/modules so that helps
you to keep everything nicely organized.
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); PLplot scientific plotting software
package (plplot.org); 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
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