On 3/28/2019 3:33 PM, Kyle Edwards wrote:
Using the DEPENDS argument of add_custom_command() will do this.
However, add_custom_command() on its own isn't enough to ensure that
the file is generated before installation. You need to pair
add_custom_command() with add_custom_target(). Example:
add_custom_command(
OUTPUT mygeneratedfile
COMMAND mytool -o mygeneratedfile
DEPENDS mysourcefile
)
add_custom_target(mygeneratedtarget
DEPENDS mygeneratedfile
)
This is different from:
add_custom_target(mygeneratedtarget
COMMAND mytool -o mygeneratedfile
BYPRODUCTS mygeneratedfile
DEPENDS mysourcefile
)
because it will only run mytool when it needs to (when mysourcefile
has changed).
Kyle,
What you say makes sense, and I can even understand why
add_custom_target might do that, but I cannot get this to actually work.
Here is a minimal CMakeLists.txt. mysourcefile is just and empty file.
I have these files in test/cmake, and I:
cd test
mkdir build-cmake
cd build-cmake
cmake ../cmake
make
and there is no sign of mygeneratedfile. I then try
make install
and I get:
$ make install
Install the project...
-- Install configuration: ""
CMake Error at cmake_install.cmake:31 (file):
file INSTALL cannot find
"/home/nort/test/build-cmake/mygeneratedfile".
make: *** [Makefile:84: install] Error 1
Where is my mistake?
cmake_minimum_required(VERSION 2.8.8)
cmake_policy(SET CMP0048 NEW)
project(table VERSION 2.0.0)
add_custom_command(
OUTPUT ${CMAKE_CURRENT_BINARY_DIR}/mygeneratedfile
COMMAND touch mygeneratedfile
DEPENDS mysourcefile
)
add_custom_target(mygeneratedtarget
DEPENDS ${CMAKE_CURRENT_BINARY_DIR}/mygeneratedfile
)
install(FILES ${CMAKE_CURRENT_BINARY_DIR}/mygeneratedfile DESTINATION bin)
--
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