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#.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.
#
# 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>
# [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. 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 ${CMAKE_CURRENT_BINARY_DIR}/simple.h MySources)
#
# Since 5.35.0.
#=============================================================================
# Copyright 2016-2017 Pino Toscano <pino@kde.org>
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions
# are met:
#
# 1. Redistributions of source code must retain the copyright
# notice, this list of conditions and the following disclaimer.
# 2. Redistributions in binary form must reproduce the copyright
# notice, this list of conditions and the following disclaimer in the
# documentation and/or other materials provided with the distribution.
# 3. The name of the author may not be used to endorse or promote products
# derived from this software without specific prior written permission.
#
# THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
# IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
# OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
# IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
# INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
# NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
# THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
#=============================================================================
include(${CMAKE_CURRENT_LIST_DIR}/ECMFindModuleHelpersStub.cmake)
ecm_find_package_version_check(Gperf)
# Find gperf
find_program(Gperf_EXECUTABLE NAMES gperf)
include(FindPackageHandleStandardArgs)
find_package_handle_standard_args(Gperf
FOUND_VAR
Gperf_FOUND
REQUIRED_VARS
Gperf_EXECUTABLE
)
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 "${Gperf_EXECUTABLE}"
)
endif()
endif()
include(FeatureSummary)
set_package_properties(Gperf PROPERTIES
URL "https://www.gnu.org/software/gperf/"
DESCRIPTION "Perfect hash function generator"
)
include(CMakeParseArguments)
function(ecm_gperf_generate input_file output_file out_var)
# Parse arguments
set(oneValueArgs GENERATION_FLAGS)
cmake_parse_arguments(ARGS "" "${oneValueArgs}" "" ${ARGN})
if(ARGS_UNPARSED_ARGUMENTS)
message(FATAL_ERROR "Unknown keywords given to ecm_gperf_generate(): \"${ARGS_UNPARSED_ARGUMENTS}\"")
endif()
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
)
list(APPEND ${out_var} "${output_file}")
set(${out_var} ${${out_var}} PARENT_SCOPE)
endfunction()
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