Oh, hi :)
Well, the add_subdirectory takes all the preprocessor defines and
include/library
paths defined before calling it into the added "subdirectory"
cmakelists.txt.
If cmakelists.txt A defines -DWhatever and calls add_subdirectory(/B)
where the
cmakelists.txt for building library B resides then the library B is
going to be
built with -DWhatever. This is probably great behaviour for some cases
but can
also be undesired:
in my case, each library has its own description file, residing in same
directory
as its cmakelists.txt, with only one function, which is included and
called with few
parameters to specify runtime etc. by each binary which has a
dependancy to library.
The description file function sets the -I to itself for caller, the -l
to its output
and, if the output file is not found, also calls add_subdirectory on
its own directory.
This is a perfect situation for developers as we can just do out of
source configuration
for whatever directory (where project resides) and only the dependancy
tree for that
particular binary is built.
It also brings additional benefit that the team which takes care about
specific
library also takes care for description file and needed defines which
splits the
ownership of projects and also presents a single point of inclusion for
that particular
library, meaning only one file has to be changed for library
specializations.
For the nightly builds, only executables are added to the build while
everything
else is built only if actually used.
It works great, but the add_subdirectory is propagating the settings
from executable
to dependant libraries and messes the build.
The question actually is: can i workaround this behaviour and if not,
can you please
include the parameter to add_subdirectory function to NOT propagate the
settings.
Regards,
Irukandji
On 2012-04-17 17:58, Kent Williams wrote:
Frankly, I don't entirely understand what the problem is, or what
your
proposed solution is.
What is it that you don't want the subdirectory context to inherit?
On Tue, Apr 17, 2012 at 10:30 AM, irukandji <irukan...@voidptr.eu>
wrote:
Hi,
(as no one answered to my previous email, let me add this:
multiplatform
project with few million lines
of code, sheer size of the project is not allowing to turn around
whole
directory tree as price / performance
is a very relevant factor and even rewriting makefiles/vcprojs to
cmake will
take months)
The add_subdirectory inheritance striked which is practically a show
stopper, it was already discussed here
http://www.mail-archive.com/cmake@cmake.org/msg34291.html What was
proposed
(DONT_INHERIT) was a great idea
and improvement to versability of CMake and also harmless for
backward
compatibility so i dont really
understand why forcing subproject to inherit all the settings.
Yes, what is added with add_subdirectory is not a child but a
sibling or
even some other part of the tree
but the point is that it doesnt stop the cmake from building it
correctly
but this inheritance is a problem
as it adds include directories to wrong versions of headers in
public libs
(due to bugs in different versions,
affecting different platforms,... the unification is impossible),
the flags
are used on wrong places etc.
Is there a way to workaround it?
Thank you.
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