Giampiero Salvi wrote:
Here is some valuable info:
cmake version 2.6-patch 1
system: Ubuntu Hardy
Giampiero
Giampiero Salvi wrote:
Dear list,
I am a bit confused on the use of add_custom_target, I hope someone
can help me.
Here is what I am trying to do:
I have a number of subdirectories that build libraries, and then I
build the final executable with a custom command (I am wrapping all
the libraries in a tclkit executable). Some libraries consist of c++
code, others of just tcl code (I just need to copy the tcl files at
compilation time).
Here is how I tried to do it:
- In case of c++ libraries I use add_library,
- in case of pure tcl libraries I use add_custom_command and
add_custom_target to copy the files (I do not use configure_file
because I want to copy the files at build time and not configuration
time).
- In the main CMakeLists.txt I use add_custom_command and
add_custom_target to wrap the libraries into an tclkit executable.
Here is the problem:
when I use DEPENDS in the main add_custom_command, it finds the
targets generated by add_library, but it complains about the ones
generated by add_custom_target with a "No rule to make target" even
though the targets are built ("[ 82%] Built target targetB")
Here is a simplified example (in case the above didn't make too much
sense):
main_dir/CMakeLists.txt: --------------------
PROJECT(main)
subdirs(dirA dirB)
ADD_CUSTOM_COMMAND(
OUTPUT ${EXECUTABLE_OUTPUT_PATH}/main_custom${CMAKE_EXECUTABLE_SUFFIX}
COMMAND wrap_libs_to_tclkit_exe
DEPENDS targetA targetB
)
ADD_CUSTOM_TARGET(main_custom ALL
DEPENDS ${EXECUTABLE_OUTPUT_PATH}/main_custom${CMAKE_EXECUTABLE_SUFFIX}
)
main_dir/dirA/CMakeLists.txt: -----------------
PROJECT(targetA)
ADD_LIBRARY(${PROJECT_NAME} SHARED file1.cxx file2.cxx file3.cxx)
TARGET_LINK_LIBRARIES(${PROJECT_NAME} blabla)
main_dir/dirB/CMakeLists.txt: -----------------
PROJECT(targetB)
SET(TCL_FILES file1.tcl file2.tcl file3.tcl)
ADD_CUSTOM_TARGET(${PROJECT_NAME} ALL)
FOREACH(file ${TCL_FILES})
GET_FILENAME_COMPONENT(name ${file} NAME)
SET(tgt ${LIBRARY_OUTPUT_PATH}/${name})
SET(src ${file})
ADD_CUSTOM_COMMAND(
TARGET ${PROJECT_NAME}
COMMAND ${CMAKE_COMMAND}
ARGS -E copy_if_different ${src} ${tgt}
DEPENDS ${src}
COMMENT "copying file: ${src} ${tgt}"
)
ENDFOREACH(file)
The result is that both targetA and targetB are built, but when
building main_custom I get the "No rule to make target `targetB'"
problem. I don't get any error with only targets on the same type as
targetA.
What am I doing wrong?
Hi again, using ADD_DEPENDENCIES works, but I don't understand why. In
fact, from many posts in the list, it is clarified that DEPENDS in
ADD_CUSTOM_TARGET only works for file-level dependencies, whereas
DEPENDS in ADD_CUSTOM_COMMAND also works at target-level deps. I was
using DEPENDS in ADD_CUSTOM_COMMAND and thus expected it to work.
The fix in the above example is to move the dependencies from
ADD_CUSTOM_COMMAND to ADD_CUSTOM_TARGET by changing
main_dir/CMakeLists.txt this way:
PROJECT(main)
SUBDIRS(dirA dirB)
ADD_CUSTOM_COMMAND(
OUTPUT ${EXECUTABLE_OUTPUT_PATH}/main_custom${CMAKE_EXECUTABLE_SUFFIX}
COMMAND wrap_libs_to_tclkit_exe
)
ADD_CUSTOM_TARGET(main_custom ALL
DEPENDS ${EXECUTABLE_OUTPUT_PATH}/main_custom${CMAKE_EXECUTABLE_SUFFIX}
)
ADD_DEPENDENCIES(main_custom targetA targetB)
Hope this helps others with the same problem.
Giampiero
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