On 07/14/2010 04:37 PM, [email protected] wrote:
> Hello,
>
> My project has third party source in a subdirectory. The third party
> source has to be compiled without special options. With autoconf, we
> had "CFLAGS =". How would I do the same with cmake and restore CFLAGS
> to their original value in the parent directory?
In the third party sources' CMakeLists.txt, do:
SET_DIRECTORY_PROPERTIES(PROPERTIES COMPILE_DEFINITIONS "")
GET_DIRECTORY_PROPERTY(DEFS DEFINITIONS)
SEPARATE_ARGUMENTS(DEFS)
REMOVE_DEFINITIONS(${DEFS})
The GET_DIRECTORY_PROPERTY()/REMOVE_DEFINITIONS() combination should be
obvious, and the SEPARATE_ARGUMENTS() is necessary to prepare the flags
for removal. Unfortunately, it fails with defines like -DNAME="ABC XYZ"
that will be split at the space in -DNAME="ABC and XYZ", but luckily in
turn, REMOVE_DEFINITIONS() silently ignores such strange flags. Though,
these defines would still show up in the compilation lines, so remove
them with SET_DIRECTORY_PROPERTIES(). Of course, you mustn't have any
properties on targets or sources with additional flags or definitions
in that directory.
As a last resort, you can manipulate the CMAKE_<LANG>_COMPILE_OBJECT
variables in that directory only, i.e. remove <FLAGS> and <DEFINES>,
but this depends on a certain knowledge of these rule variables, i.e.
it's doubtful if this works the same for all platforms, compilers etc.
'hope that helps.
Regards,
Michael
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