Hi list,
I have a question regarding "add_custom_command" and OBJECT-libraries:
My CMakeLists.txt contains the following (simplified) targets:
```
set ( SOURCE_FILES
# ... several C++-source files
)
add_library( OBJECT ${PROJECT_NAME}_OBJECTS
${SOURCE_FILES}
)
add_library( ${PROJECT_NAME}
$<TARGET_OBJECTS:${PROJECT_NAME}_OBJECTS>
)
```
This works just fine. However, now I want to add an additional
build-step after creation of the object-files and before linking the
shared library. (In particular, I want to compress the debug-symbols in
the object-files. But that should be irrelevant for my question.)
My first attempt was to add the following between the two add_library
commands:
```
add_custom_command( TARGET ${PROJECT_NAME}_OBJECTS POST_BUILD
COMMAND objcopy --compress-debug-sections
$<TARGET_OBJECTS:${PROJECT_NAME}_OBJECT>
)
```
But that results in the following error:
```
(add_custom_command):
Target "MyProject_OBJECTS" is an OBJECT library that may not
have PRE_BUILD, PRE_LINK, or POST_BUILD commands.
```
So I tried instead to add the following between the two add_library
commands:
```
add_custom_command( TARGET ${PROJECT_NAME} PRE_LINK
COMMAND objcopy --compress-debug-sections
$<TARGET_OBJECTS:${PROJECT_NAME}_OBJECT>
)
```
This then fails when evaluating the generator-expression:
```
(add_custom_command):
Error evaluating generator expression:
$<TARGET_OBJECTS:MyProject_OBJECTS>
The evaluation of the TARGET_OBJECTS generator expression is only
suitable
for consumption by CMake. It is not suitable for writing out elsewhere.
```
So I am currently out of ideas (which do not make the CMakeLists.txt
file completely unmaintainable). Therefore my question is:
How can I retrieve the list of generated object-files so that I can pass
it to another program that should be run as additional build-step before
linking?
IMHO, the most comfortable (and syntactically cleanest) way would be my
first attempt. But that is probably more a feature-request than a simple
question.
Thanks for your help.
Deniz Bahadir
--
Powered by www.kitware.com
Please keep messages on-topic and check the CMake FAQ at:
http://www.cmake.org/Wiki/CMake_FAQ
Kitware offers various services to support the CMake community. For more
information on each offering, please visit:
CMake Support: http://cmake.org/cmake/help/support.html
CMake Consulting: http://cmake.org/cmake/help/consulting.html
CMake Training Courses: http://cmake.org/cmake/help/training.html
Visit other Kitware open-source projects at
http://www.kitware.com/opensource/opensource.html
Follow this link to subscribe/unsubscribe:
http://public.kitware.com/mailman/listinfo/cmake
