On 18/09/2011 21:54, Alexander Neundorf wrote:
On Sunday, September 18, 2011 02:42:49 PM Michael Wild wrote:
On 09/18/2011 02:32 PM, Alexander Neundorf wrote:
On Sunday, September 18, 2011 02:15:54 PM David Demelier wrote:
Hello,
I noticed that option() values are not checked when the option() command
is under a add_subdirectory() target.
Example:
-- a's CMakeLists.txt --
project(a C)
set(BUILD_DEMOS OFF)
add_subdirectory(extern/b)
-- extern/b's CMakeLists.txt --
project(b C)
option(BUILD_DEMOS "Enable the demos build" ON)
if (BUILD_DEMOS)
...
endif ()
Then when building the project a it will also enter the if BUILD_DEMOS
conditional.
What can I do now? :)
The values of options are stored in the cache.
In your toplevel file, OFF is put in the cache.
Then, in the subdir, the variable of BUILD_DEMOS is already in the cache,
so it is not overridden with ON, but keeps the value which is in the
cache.
Does that help ?
Alex
Alex, you mis-read his code. In the top-level CMakeLists.txt file
BUILD_DEMOS is *not* put in the cache, which is why it is overridden by
the option() call *the first time round*, but not afterwards which makes
for very confusing behaviour.
In general, it is safe to override a cached variable with a uncached
variable, but the other way round is asking for trouble...
It would be better to do in a/CMakeLists.txt:
set(BUILD_DEMOS OFF CACHE INTERNAL "Don't build demos")
Yes, you are completely right.
Alex
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Thanks a lot! This solved my problem :)
Cheers,
--
David Demelier
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