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+##
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+# Compile vala files to their c equivalents for further processing.
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+#
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+# The "vala_precompile" function takes care of calling the valac executable on
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+# the given source to produce c files which can then be processed further using
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+# default cmake functions.
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+#
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+# The first parameter provided is a variable, which will be filled with a list
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+# of c files outputted by the vala compiler. This list can than be used in
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+# conjuction with functions like "add_executable" or others to create the
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+# neccessary compile rules with CMake.
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+#
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+# The following sections may be specified afterwards to provide certain options
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+# to the vala compiler:
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+#
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+# SOURCES
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+# A list of .vala files to be compiled. Please take care to add every vala
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+# file belonging to the currently compiled project or library as Vala will
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+# otherwise not be able to resolve all dependencies.
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+#
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+# PACKAGES
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+# A list of vala packages/libraries to be used during the compile cycle. The
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+# package names are exactly the same, as they would be passed to the valac
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+# "--pkg=" option.
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+#
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+# OPTIONS
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+# A list of optional options to be passed to the valac executable. This can be
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+# used to pass "--thread" for example to enable multi-threading support.
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+#
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+# CUSTOM_VAPIS
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+# A list of custom vapi files to be included for compilation. This can be
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+# useful to include freshly created vala libraries without having to install
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+# them in the system.
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+#
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+# GENERATE_VAPI
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+# Pass all the needed flags to the compiler to create an internal vapi for
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+# the compiled library. The provided name will be used for this and a
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+# <provided_name>.vapi file will be created.
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+#
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+# GENERATE_HEADER
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+# Let the compiler generate a header file for the compiled code. There will
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+# be a header file as well as an internal header file being generated called
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+# <provided_name>.h and <provided_name>_internal.h
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+#
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+# The following call is a simple example to the vala_precompile macro showing
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+# an example to every of the optional sections:
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+#
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+# find_package(Vala "0.12" REQUIRED)
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+# inlcude(${VALA_USE_FILE})
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+#
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+# vala_precompile(VALA_C
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+# SOURCES
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+# source1.vala
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+# source2.vala
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+# source3.vala
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+# PACKAGES
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+# gtk+-2.0
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+# gio-1.0
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+# posix
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+# DIRECTORY
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+# gen
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+# OPTIONS
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+# --thread
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+# CUSTOM_VAPIS
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+# some_vapi.vapi
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+# GENERATE_VAPI
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+# myvapi
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+# GENERATE_HEADER
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+# myheader
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+# )
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+#
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+# Most important is the variable VALA_C which will contain all the generated c
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+# file names after the call.
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+##
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+
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+##
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+# Copyright 2009-2010 Jakob Westhoff. All rights reserved.
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+# Copyright 2010-2011 Daniel Pfeifer
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+#
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+# Redistribution and use in source and binary forms, with or without
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+# modification, are permitted provided that the following conditions are met:
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+#
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+# 1. Redistributions of source code must retain the above copyright notice,
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+# this list of conditions and the following disclaimer.
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+#
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+# 2. Redistributions in binary form must reproduce the above copyright notice,
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+# this list of conditions and the following disclaimer in the documentation
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+# and/or other materials provided with the distribution.
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+#
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+# THIS SOFTWARE IS PROVIDED BY JAKOB WESTHOFF ``AS IS'' AND ANY EXPRESS OR
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+# IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
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+# MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO
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+# EVENT SHALL JAKOB WESTHOFF OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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+# INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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+# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
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+# PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
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+# LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE
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+# OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
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+# ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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+#
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+# The views and conclusions contained in the software and documentation are those
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+# of the authors and should not be interpreted as representing official policies,
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+# either expressed or implied, of Jakob Westhoff
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+##
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+
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+include(CMakeParseArguments)
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+
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+function(vala_precompile output)
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+ cmake_parse_arguments(ARGS "" "DIRECTORY;GENERATE_HEADER;GENERATE_VAPI"
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+ "SOURCES;PACKAGES;OPTIONS;CUSTOM_VAPIS" ${ARGN})
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+
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+ if(ARGS_DIRECTORY)
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+ set(DIRECTORY ${CMAKE_CURRENT_SOURCE_DIR}/${ARGS_DIRECTORY})
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+ else(ARGS_DIRECTORY)
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+ set(DIRECTORY ${CMAKE_CURRENT_BINARY_DIR})
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+ endif(ARGS_DIRECTORY)
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+ include_directories(${DIRECTORY})
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+ set(vala_pkg_opts "")
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+ foreach(pkg ${ARGS_PACKAGES})
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+ list(APPEND vala_pkg_opts "--pkg=${pkg}")
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+ endforeach(pkg ${ARGS_PACKAGES})
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+ set(in_files "")
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+ set(out_files "")
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+ foreach(src ${ARGS_SOURCES} ${ARGS_UNPARSED_ARGUMENTS})
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+ list(APPEND in_files "${CMAKE_CURRENT_SOURCE_DIR}/${src}")
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+ string(REPLACE ".vala" ".c" src ${src})
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+ string(REPLACE ".gs" ".c" src ${src})
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+ set(out_file "${DIRECTORY}/${src}")
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+ list(APPEND out_files "${DIRECTORY}/${src}")
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+ endforeach(src ${ARGS_SOURCES} ${ARGS_UNPARSED_ARGUMENTS})
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+
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+ set(custom_vapi_arguments "")
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+ if(ARGS_CUSTOM_VAPIS)
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+ foreach(vapi ${ARGS_CUSTOM_VAPIS})
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+ if(${vapi} MATCHES ${CMAKE_SOURCE_DIR} OR ${vapi} MATCHES ${CMAKE_BINARY_DIR})
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+ list(APPEND custom_vapi_arguments ${vapi})
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+ else (${vapi} MATCHES ${CMAKE_SOURCE_DIR} OR ${vapi} MATCHES ${CMAKE_BINARY_DIR})
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+ list(APPEND custom_vapi_arguments ${CMAKE_CURRENT_SOURCE_DIR}/${vapi})
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+ endif(${vapi} MATCHES ${CMAKE_SOURCE_DIR} OR ${vapi} MATCHES ${CMAKE_BINARY_DIR})
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+ endforeach(vapi ${ARGS_CUSTOM_VAPIS})
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+ endif(ARGS_CUSTOM_VAPIS)
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+
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+ set(vapi_arguments "")
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+ if(ARGS_GENERATE_VAPI)
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+ list(APPEND out_files "${DIRECTORY}/${ARGS_GENERATE_VAPI}.vapi")
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+ set(vapi_arguments "--internal-vapi=${ARGS_GENERATE_VAPI}.vapi")
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+
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+ # Header and internal header is needed to generate internal vapi
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+ if (NOT ARGS_GENERATE_HEADER)
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+ set(ARGS_GENERATE_HEADER ${ARGS_GENERATE_VAPI})
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+ endif(NOT ARGS_GENERATE_HEADER)
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+ endif(ARGS_GENERATE_VAPI)
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+
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+ set(header_arguments "")
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+ if(ARGS_GENERATE_HEADER)
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+ list(APPEND out_files "${DIRECTORY}/${ARGS_GENERATE_HEADER}.h")
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+ list(APPEND out_files "${DIRECTORY}/${ARGS_GENERATE_HEADER}_internal.h")
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+ list(APPEND header_arguments "--header=${DIRECTORY}/${ARGS_GENERATE_HEADER}.h")
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+ list(APPEND header_arguments "--internal-header=${DIRECTORY}/${ARGS_GENERATE_HEADER}_internal.h")
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+ endif(ARGS_GENERATE_HEADER)
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+
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+ add_custom_command(OUTPUT ${out_files}
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+ COMMAND
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+ ${VALA_EXECUTABLE}
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+ ARGS
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+ "-C"
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+ ${header_arguments}
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+ ${vapi_arguments}
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+ "-b" ${CMAKE_CURRENT_SOURCE_DIR}
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+ "-d" ${DIRECTORY}
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+ ${vala_pkg_opts}
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+ ${ARGS_OPTIONS}
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+ ${in_files}
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+ ${custom_vapi_arguments}
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+ DEPENDS
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+ ${in_files}
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+ ${ARGS_CUSTOM_VAPIS}
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+ )
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+ set(${output} ${out_files} PARENT_SCOPE)
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+endfunction(vala_precompile)
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