In order to maximize our ability to rebuild an exact copy of a previous
revision, our repository carries copies of numerous 3rd party libraries.
However, in most of their cases we are fairly selective about which
elements we build.
Downside: "make clean && make" winds up rebuilding all the damn libraries :)
At the same time, we have a large number of customized project-wide
customizations, depending on which client / product version we're
building for. So, when we are building - as opposed to developing - we
need the ability to easily perform a full rebuild, including possibly
the libraries.
For a nominal development "clean" build, upto 70% of the build time is
spent building 3rd party libraries.
Right now - for simplicity - we actually assemble the 3rd libraries from
the top level CMakeLists.txt directly (ok, simplicity and a failure on
my part to work out how to express that "libraryXXX.a" is an output of
"subfolderX").
/The problem/
Something like a source-control revert can sometimes put /our/ part of
the code base into a state that requires a clean. However, we don't want
to cause the libraries to rebuild /except/ when someone changes
compilation flags or forces a rebuild of the libraries somehow else
(e.g. a "cleanall" target).
Is there a way to do this with cmake? Or is this problem only because I
haven't (yet) split these libraries into their own CMakeLists files?
The simplest and therefore easiest complete example I have is:
8x --- snip --- x8
add_library(ircclient SHARED libircclient/src/libircclient.c)
set_property(TARGET ircclient PROPERTY COMPILE_DEFINITIONS
IN_BUILDING_LIBIRC)
link_directories( ${Project_BINARY_DIR}/ircclient )
8x --- snip --- x8
- Oliver
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