Kolja Waschk wrote:
> Beside the SVN revision number of the working base, our embedded
> revision information also tells whether the library was built from code
> with local modifications, i.e. whether it equals the source code stored
> in the SVN repository or was changed afterwards. Changing a single byte
> in a header file already affects that state, so all headers need to be
> watched.
So you need some combination of "svn info" and "svn status".
> Try #1: add_custom_command(OUTPUT version.cc DEPENDS ${SOURCES} ...)
You need the custom command to run every time the build starts:
add_custom_target(update_version
COMMAND ${CMAKE_COMMAND} -P update_version.cmake
)
The update_version.cmake script should compute the version and then
use configure_file() to store the result in "version.h" with a
copy-if-different check. The key is then to make the library depend
on this rule at a *target* level, but only on version.h at a *file*
level.
add_library(mylib version.c) # version.c does #include "version.h"
add_dependencies(mylib update_version)
The update_version target will always run the command before the build
system considers mylib. Then the version.c source will recompile only
if the version update rule actually changed version.h content.
> Try #2: as above plus IMPLICIT_DEPENDS CXX ${SOURCES} ...
FYI, any solution based on IMPLICIT_DEPENDS will not work with VS IDE
and other non-Makefile generators. It is documented to work only with
Makefile generators.
-Brad
_______________________________________________
Powered by www.kitware.com
Visit other Kitware open-source projects at
http://www.kitware.com/opensource/opensource.html
Please keep messages on-topic and check the CMake FAQ at:
http://www.cmake.org/Wiki/CMake_FAQ
Follow this link to subscribe/unsubscribe:
http://www.cmake.org/mailman/listinfo/cmake
