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# SPDX-FileCopyrightText: 2016-2017 Pino Toscano <pino@kde.org>
#
# SPDX-License-Identifier: BSD-3-Clause
#[=======================================================================[.rst:
FindGperf
-----------
Try to find GNU gperf.
If the gperf executable is not in your PATH, you can provide
an alternative name or full path location with the ``Gperf_EXECUTABLE``
variable.
This will define the following variables:
``Gperf_FOUND``
True if gperf is available.
``Gperf_EXECUTABLE``
The gperf executable.
``Gperf_VERSION``
The gperf version. (since 5.85)
If ``Gperf_FOUND`` is TRUE, it will also define the following imported
target:
``GPerf::Gperf``
The gperf executable.
and the following public function:
::
ecm_gperf_generate(<GperfInput> <OutputFile> <OutputVariable(|target (since 5.83))>
[GENERATION_FLAGS <flags>])
Run ``gperf`` on ``<GperfInput>`` to generate ``<OutputFile>``, adding it to
the ``<OutputVariable>`` variable which contains the source for the target
where ``<OutputFile>`` is going to be built or, since KF 5.83, if the given
argument is a target, to the list of private sources of that target. The
target must not be an alias. The optional ``GENERATION_FLAGS`` argument is
needed to pass extra parameters to ``gperf`` (note you cannot override that
way the output file).
A simple invocation would be:
.. code-block:: cmake
ecm_gperf_generate(simple.gperf ${CMAKE_CURRENT_BINARY_DIR}/simple.h MySources)
Since 5.35.0.
#]=======================================================================]
include(${CMAKE_CURRENT_LIST_DIR}/ECMFindModuleHelpersStub.cmake)
ecm_find_package_version_check(Gperf)
# Find gperf
find_program(Gperf_EXECUTABLE NAMES gperf)
if(Gperf_EXECUTABLE)
execute_process(COMMAND ${Gperf_EXECUTABLE} -v
OUTPUT_VARIABLE _version_string
ERROR_QUIET
OUTPUT_STRIP_TRAILING_WHITESPACE)
if(_version_string MATCHES "^GNU gperf ([-0-9\\.]+)")
set(Gperf_VERSION "${CMAKE_MATCH_1}")
endif()
unset(_version_string)
else()
set(Gperf_VERSION)
endif()
include(FindPackageHandleStandardArgs)
find_package_handle_standard_args(Gperf
FOUND_VAR
Gperf_FOUND
REQUIRED_VARS
Gperf_EXECUTABLE
VERSION_VAR
Gperf_VERSION
)
mark_as_advanced(Gperf_EXECUTABLE)
if (Gperf_FOUND)
if (NOT TARGET GPerf::Gperf)
add_executable(GPerf::Gperf IMPORTED)
set_target_properties(GPerf::Gperf PROPERTIES
IMPORTED_LOCATION "${Gperf_EXECUTABLE}"
)
endif()
endif()
include(FeatureSummary)
set_package_properties(Gperf PROPERTIES
URL "https://www.gnu.org/software/gperf/"
DESCRIPTION "Perfect hash function generator"
)
include(CMakeParseArguments)
function(ecm_gperf_generate input_file output_file _target_or_sources_var)
# Parse arguments
set(oneValueArgs GENERATION_FLAGS)
cmake_parse_arguments(ARGS "" "${oneValueArgs}" "" ${ARGN})
if(ARGS_UNPARSED_ARGUMENTS)
message(FATAL_ERROR "Unknown keywords given to ecm_gperf_generate(): \"${ARGS_UNPARSED_ARGUMENTS}\"")
endif()
if (TARGET ${_target_or_sources_var})
get_target_property(aliased_target ${_target_or_sources_var} ALIASED_TARGET)
if(aliased_target)
message(FATAL_ERROR "Target argument passed to ecm_gperf_generate must not be an alias: ${_target_or_sources_var}")
endif()
endif()
get_filename_component(_infile ${input_file} ABSOLUTE)
set(_extraopts "${ARGS_GENERATION_FLAGS}")
separate_arguments(_extraopts)
add_custom_command(OUTPUT ${output_file}
COMMAND ${Gperf_EXECUTABLE} ${_extraopts} --output-file=${output_file} ${_infile}
DEPENDS ${_infile}
WORKING_DIRECTORY ${CMAKE_CURRENT_BINARY_DIR}
VERBATIM
)
set_property(SOURCE ${output_file} PROPERTY SKIP_AUTOMOC ON)
if (TARGET ${_target_or_sources_var})
target_sources(${_target_or_sources_var} PRIVATE ${output_file})
else()
set(${_target_or_sources_var} ${${_target_or_sources_var}} ${output_file} PARENT_SCOPE)
endif()
endfunction()
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