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26078a7055
- Added examples section. - Descriptions synced a bit. - Separated result and cache variables. - RST syntax synced. - LTTngUST_FOUND and the uppercased LTTNGUST_FOUND are always set to the same value by the find module in this case - description synced.
126 lines
4.2 KiB
CMake
126 lines
4.2 KiB
CMake
# Distributed under the OSI-approved BSD 3-Clause License. See accompanying
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# file LICENSE.rst or https://cmake.org/licensing for details.
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#[=======================================================================[.rst:
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FindLTTngUST
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------------
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.. versionadded:: 3.6
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Finds the `LTTng <https://lttng.org/>`_ (Linux Trace Toolkit: next generation)
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user space tracing library (LTTng-UST).
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Imported Targets
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^^^^^^^^^^^^^^^^
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This module defines the following :ref:`Imported Targets`:
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``LTTng::UST``
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Target providing the LTTng-UST library usage requirements. This target is
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available only when LTTng-UST is found.
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Result Variables
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^^^^^^^^^^^^^^^^
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This module sets the following variables:
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``LTTngUST_FOUND``
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Boolean indicating whether the LTTng-UST library is found. For backward
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compatibility, the ``LTTNGUST_FOUND`` variable is also set to the same value.
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``LTTNGUST_VERSION_STRING``
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The LTTng-UST version.
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``LTTNGUST_HAS_TRACEF``
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``TRUE`` if the ``tracef()`` API is available in the system's LTTng-UST.
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``LTTNGUST_HAS_TRACELOG``
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``TRUE`` if the ``tracelog()`` API is available in the system's LTTng-UST.
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Cache Variables
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^^^^^^^^^^^^^^^
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The following cache variables may also be set:
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``LTTNGUST_INCLUDE_DIRS``
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The LTTng-UST include directories.
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``LTTNGUST_LIBRARIES``
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The libraries needed to use LTTng-UST.
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Examples
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^^^^^^^^
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Finding the LTTng-UST library and linking it to a project target:
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.. code-block:: cmake
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find_package(LTTugNST)
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target_link_libraries(project_target PRIVATE LTTng::UST)
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#]=======================================================================]
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cmake_policy(PUSH)
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cmake_policy(SET CMP0159 NEW) # file(STRINGS) with REGEX updates CMAKE_MATCH_<n>
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find_path(LTTNGUST_INCLUDE_DIRS NAMES lttng/tracepoint.h)
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find_library(LTTNGUST_LIBRARIES NAMES lttng-ust)
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if(LTTNGUST_INCLUDE_DIRS AND LTTNGUST_LIBRARIES)
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# find tracef() and tracelog() support
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set(LTTNGUST_HAS_TRACEF 0)
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set(LTTNGUST_HAS_TRACELOG 0)
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if(EXISTS "${LTTNGUST_INCLUDE_DIRS}/lttng/tracef.h")
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set(LTTNGUST_HAS_TRACEF TRUE)
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endif()
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if(EXISTS "${LTTNGUST_INCLUDE_DIRS}/lttng/tracelog.h")
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set(LTTNGUST_HAS_TRACELOG TRUE)
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endif()
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# get version
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set(lttngust_version_file "${LTTNGUST_INCLUDE_DIRS}/lttng/ust-version.h")
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if(EXISTS "${lttngust_version_file}")
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file(STRINGS "${lttngust_version_file}" lttngust_version_major_string
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REGEX "^[\t ]*#define[\t ]+LTTNG_UST_MAJOR_VERSION[\t ]+[0-9]+[\t ]*$")
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file(STRINGS "${lttngust_version_file}" lttngust_version_minor_string
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REGEX "^[\t ]*#define[\t ]+LTTNG_UST_MINOR_VERSION[\t ]+[0-9]+[\t ]*$")
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file(STRINGS "${lttngust_version_file}" lttngust_version_patch_string
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REGEX "^[\t ]*#define[\t ]+LTTNG_UST_PATCHLEVEL_VERSION[\t ]+[0-9]+[\t ]*$")
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string(REGEX REPLACE ".*[\t ]+([0-9]+).*" "\\1"
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lttngust_v_major "${lttngust_version_major_string}")
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string(REGEX REPLACE ".*[\t ]+([0-9]+).*" "\\1"
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lttngust_v_minor "${lttngust_version_minor_string}")
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string(REGEX REPLACE ".*[\t ]+([0-9]+).*" "\\1"
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lttngust_v_patch "${lttngust_version_patch_string}")
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set(LTTNGUST_VERSION_STRING
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"${lttngust_v_major}.${lttngust_v_minor}.${lttngust_v_patch}")
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unset(lttngust_version_major_string)
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unset(lttngust_version_minor_string)
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unset(lttngust_version_patch_string)
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unset(lttngust_v_major)
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unset(lttngust_v_minor)
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unset(lttngust_v_patch)
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endif()
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unset(lttngust_version_file)
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if(NOT TARGET LTTng::UST)
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add_library(LTTng::UST UNKNOWN IMPORTED)
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set_target_properties(LTTng::UST PROPERTIES
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INTERFACE_INCLUDE_DIRECTORIES "${LTTNGUST_INCLUDE_DIRS}"
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INTERFACE_LINK_LIBRARIES ${CMAKE_DL_LIBS}
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IMPORTED_LINK_INTERFACE_LANGUAGES "C"
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IMPORTED_LOCATION "${LTTNGUST_LIBRARIES}")
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endif()
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# add libdl to required libraries
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set(LTTNGUST_LIBRARIES ${LTTNGUST_LIBRARIES} ${CMAKE_DL_LIBS})
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endif()
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include(FindPackageHandleStandardArgs)
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find_package_handle_standard_args(LTTngUST
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REQUIRED_VARS LTTNGUST_LIBRARIES
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LTTNGUST_INCLUDE_DIRS
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VERSION_VAR LTTNGUST_VERSION_STRING)
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mark_as_advanced(LTTNGUST_LIBRARIES LTTNGUST_INCLUDE_DIRS)
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cmake_policy(POP)
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