Ament/Colcon: Share variable between package CMakeLists

asked 2018-12-12 07:43:44 -0500

Flautz
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updated 2018-12-12 17:48:32 -0500

jayess
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I want to share a filepath variable between the CMakeLists of two packages.

When I set in the firstCMakeLists a variable using the following ways:

set(varABC "x" CACHE STRING "Description")
set( ENV{varDEF} x )

It won't appear in the second CmakeLists the following way:

find_package(packageA REQUIRED)
message(STATUS "${varABC}")
message(STATUS "${varDEF}")

Anybody knows how to do that the right way?

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answered 2018-12-12 11:58:09 -0500

Dirk Thomas
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Each package is a separate CMake project. For each a separate CMake invocation is being used. So variables set in one are not available in the other.

The ament_cmake function ament_package has an argument CONFIG_EXTRAS (see https://github.com/ament/ament_cmake/... ). You can provide you own CMake file which will be included when other packages find your package with find_package().

You will find examples how to use the argument in various packages (e.g. in rclcpp).

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Thanks, that seems to be the right thing!

Flautz ( 2018-12-12 14:34:08 -0500 )edit

Please mark the answer as correct (using the checkmark below the voting) if it answers the question. It just helps others to find answered questions in the future. Thanks.

Dirk Thomas ( 2018-12-12 15:22:35 -0500 )edit

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answered 2019-06-27 10:57:55 -0500

bergercookie
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updated 2019-06-27 10:58:36 -0500

In my case I wanted to reuse a unittests-related file of package A in another package B. I resided to the following setup:

packageA/CMakeLists.txt: ament_package(CONFIG_EXTRAS cmake/extra.cmake.in)
packageA/cmake/extra.cmake: get_filename_component(@PROJECT_NAME@_TEST_DIR @PROJECT_SOURCE_DIR@/test ABSOLUTE)
packageB/CMakeLists.txt: find_package(packageA), include_directories(${packageA_TEST_DIR})
Then just use the file that's under the test dir in your cpp/hpp files of package B: #include "filename-relative to *_TEST_DIR"

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Ament/Colcon: Share variable between package CMakeLists

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