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443 lines
15 KiB
443 lines
15 KiB
# Distributed under the OSI-approved BSD 3-Clause License. See accompanying
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# file Copyright.txt or https://cmake.org/licensing for details.
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#.rst:
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# GenerateExportHeader
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# --------------------
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#
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# Function for generation of export macros for libraries
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#
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# This module provides the function GENERATE_EXPORT_HEADER().
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#
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# The ``GENERATE_EXPORT_HEADER`` function can be used to generate a file
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# suitable for preprocessor inclusion which contains EXPORT macros to be
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# used in library classes::
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#
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# GENERATE_EXPORT_HEADER( LIBRARY_TARGET
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# [BASE_NAME <base_name>]
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# [EXPORT_MACRO_NAME <export_macro_name>]
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# [EXPORT_FILE_NAME <export_file_name>]
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# [DEPRECATED_MACRO_NAME <deprecated_macro_name>]
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# [NO_EXPORT_MACRO_NAME <no_export_macro_name>]
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# [INCLUDE_GUARD_NAME <include_guard_name>]
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# [STATIC_DEFINE <static_define>]
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# [NO_DEPRECATED_MACRO_NAME <no_deprecated_macro_name>]
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# [DEFINE_NO_DEPRECATED]
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# [PREFIX_NAME <prefix_name>]
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# [CUSTOM_CONTENT_FROM_VARIABLE <variable>]
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# )
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#
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#
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# The target properties :prop_tgt:`CXX_VISIBILITY_PRESET <<LANG>_VISIBILITY_PRESET>`
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# and :prop_tgt:`VISIBILITY_INLINES_HIDDEN` can be used to add the appropriate
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# compile flags for targets. See the documentation of those target properties,
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# and the convenience variables
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# :variable:`CMAKE_CXX_VISIBILITY_PRESET <CMAKE_<LANG>_VISIBILITY_PRESET>` and
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# :variable:`CMAKE_VISIBILITY_INLINES_HIDDEN`.
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#
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# By default ``GENERATE_EXPORT_HEADER()`` generates macro names in a file
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# name determined by the name of the library. This means that in the
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# simplest case, users of ``GenerateExportHeader`` will be equivalent to:
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#
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# .. code-block:: cmake
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#
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# set(CMAKE_CXX_VISIBILITY_PRESET hidden)
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# set(CMAKE_VISIBILITY_INLINES_HIDDEN 1)
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# add_library(somelib someclass.cpp)
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# generate_export_header(somelib)
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# install(TARGETS somelib DESTINATION ${LIBRARY_INSTALL_DIR})
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# install(FILES
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# someclass.h
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# ${PROJECT_BINARY_DIR}/somelib_export.h DESTINATION ${INCLUDE_INSTALL_DIR}
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# )
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#
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#
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# And in the ABI header files:
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#
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# .. code-block:: c++
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#
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# #include "somelib_export.h"
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# class SOMELIB_EXPORT SomeClass {
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# ...
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# };
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#
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#
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# The CMake fragment will generate a file in the
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# ``${CMAKE_CURRENT_BINARY_DIR}`` called ``somelib_export.h`` containing the
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# macros ``SOMELIB_EXPORT``, ``SOMELIB_NO_EXPORT``, ``SOMELIB_DEPRECATED``,
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# ``SOMELIB_DEPRECATED_EXPORT`` and ``SOMELIB_DEPRECATED_NO_EXPORT``.
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# They will be followed by content taken from the variable specified by
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# the ``CUSTOM_CONTENT_FROM_VARIABLE`` option, if any.
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# The resulting file should be installed with other headers in the library.
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#
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# The ``BASE_NAME`` argument can be used to override the file name and the
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# names used for the macros:
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#
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# .. code-block:: cmake
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#
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# add_library(somelib someclass.cpp)
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# generate_export_header(somelib
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# BASE_NAME other_name
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# )
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#
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#
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# Generates a file called ``other_name_export.h`` containing the macros
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# ``OTHER_NAME_EXPORT``, ``OTHER_NAME_NO_EXPORT`` and ``OTHER_NAME_DEPRECATED``
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# etc.
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#
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# The ``BASE_NAME`` may be overridden by specifying other options in the
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# function. For example:
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#
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# .. code-block:: cmake
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#
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# add_library(somelib someclass.cpp)
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# generate_export_header(somelib
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# EXPORT_MACRO_NAME OTHER_NAME_EXPORT
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# )
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#
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#
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# creates the macro ``OTHER_NAME_EXPORT`` instead of ``SOMELIB_EXPORT``, but
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# other macros and the generated file name is as default:
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#
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# .. code-block:: cmake
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#
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# add_library(somelib someclass.cpp)
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# generate_export_header(somelib
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# DEPRECATED_MACRO_NAME KDE_DEPRECATED
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# )
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#
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#
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# creates the macro ``KDE_DEPRECATED`` instead of ``SOMELIB_DEPRECATED``.
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#
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# If ``LIBRARY_TARGET`` is a static library, macros are defined without
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# values.
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#
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# If the same sources are used to create both a shared and a static
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# library, the uppercased symbol ``${BASE_NAME}_STATIC_DEFINE`` should be
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# used when building the static library:
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#
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# .. code-block:: cmake
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#
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# add_library(shared_variant SHARED ${lib_SRCS})
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# add_library(static_variant ${lib_SRCS})
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# generate_export_header(shared_variant BASE_NAME libshared_and_static)
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# set_target_properties(static_variant PROPERTIES
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# COMPILE_FLAGS -DLIBSHARED_AND_STATIC_STATIC_DEFINE)
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#
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# This will cause the export macros to expand to nothing when building
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# the static library.
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#
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# If ``DEFINE_NO_DEPRECATED`` is specified, then a macro
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# ``${BASE_NAME}_NO_DEPRECATED`` will be defined This macro can be used to
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# remove deprecated code from preprocessor output:
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#
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# .. code-block:: cmake
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#
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# option(EXCLUDE_DEPRECATED "Exclude deprecated parts of the library" FALSE)
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# if (EXCLUDE_DEPRECATED)
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# set(NO_BUILD_DEPRECATED DEFINE_NO_DEPRECATED)
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# endif()
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# generate_export_header(somelib ${NO_BUILD_DEPRECATED})
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#
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#
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# And then in somelib:
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#
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# .. code-block:: c++
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#
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# class SOMELIB_EXPORT SomeClass
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# {
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# public:
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# #ifndef SOMELIB_NO_DEPRECATED
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# SOMELIB_DEPRECATED void oldMethod();
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# #endif
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# };
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#
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# .. code-block:: c++
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#
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# #ifndef SOMELIB_NO_DEPRECATED
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# void SomeClass::oldMethod() { }
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# #endif
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#
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#
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# If ``PREFIX_NAME`` is specified, the argument will be used as a prefix to
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# all generated macros.
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#
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# For example:
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#
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# .. code-block:: cmake
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#
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# generate_export_header(somelib PREFIX_NAME VTK_)
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#
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# Generates the macros ``VTK_SOMELIB_EXPORT`` etc.
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#
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# ::
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#
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# ADD_COMPILER_EXPORT_FLAGS( [<output_variable>] )
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#
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# The ``ADD_COMPILER_EXPORT_FLAGS`` function adds ``-fvisibility=hidden`` to
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# :variable:`CMAKE_CXX_FLAGS <CMAKE_<LANG>_FLAGS>` if supported, and is a no-op
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# on Windows which does not need extra compiler flags for exporting support.
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# You may optionally pass a single argument to ``ADD_COMPILER_EXPORT_FLAGS``
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# that will be populated with the ``CXX_FLAGS`` required to enable visibility
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# support for the compiler/architecture in use.
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#
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# This function is deprecated. Set the target properties
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# :prop_tgt:`CXX_VISIBILITY_PRESET <<LANG>_VISIBILITY_PRESET>` and
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# :prop_tgt:`VISIBILITY_INLINES_HIDDEN` instead.
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include(CheckCCompilerFlag)
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include(CheckCXXCompilerFlag)
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# TODO: Install this macro separately?
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macro(_check_cxx_compiler_attribute _ATTRIBUTE _RESULT)
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check_cxx_source_compiles("${_ATTRIBUTE} int somefunc() { return 0; }
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int main() { return somefunc();}" ${_RESULT}
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)
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endmacro()
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# TODO: Install this macro separately?
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macro(_check_c_compiler_attribute _ATTRIBUTE _RESULT)
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check_c_source_compiles("${_ATTRIBUTE} int somefunc() { return 0; }
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int main() { return somefunc();}" ${_RESULT}
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)
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endmacro()
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macro(_test_compiler_hidden_visibility)
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if(CMAKE_COMPILER_IS_GNUCXX AND CMAKE_CXX_COMPILER_VERSION VERSION_LESS "4.2")
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set(GCC_TOO_OLD TRUE)
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elseif(CMAKE_COMPILER_IS_GNUCC AND CMAKE_C_COMPILER_VERSION VERSION_LESS "4.2")
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set(GCC_TOO_OLD TRUE)
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elseif(CMAKE_CXX_COMPILER_ID MATCHES Intel AND CMAKE_CXX_COMPILER_VERSION VERSION_LESS "12.0")
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set(_INTEL_TOO_OLD TRUE)
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endif()
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# Exclude XL here because it misinterprets -fvisibility=hidden even though
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# the check_cxx_compiler_flag passes
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if(NOT GCC_TOO_OLD
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AND NOT _INTEL_TOO_OLD
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AND NOT WIN32
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AND NOT CYGWIN
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AND NOT CMAKE_CXX_COMPILER_ID MATCHES XL
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AND NOT CMAKE_CXX_COMPILER_ID MATCHES PGI
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AND NOT CMAKE_CXX_COMPILER_ID MATCHES Watcom)
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if (CMAKE_CXX_COMPILER_LOADED)
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check_cxx_compiler_flag(-fvisibility=hidden COMPILER_HAS_HIDDEN_VISIBILITY)
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check_cxx_compiler_flag(-fvisibility-inlines-hidden
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COMPILER_HAS_HIDDEN_INLINE_VISIBILITY)
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else()
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check_c_compiler_flag(-fvisibility=hidden COMPILER_HAS_HIDDEN_VISIBILITY)
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check_c_compiler_flag(-fvisibility-inlines-hidden
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COMPILER_HAS_HIDDEN_INLINE_VISIBILITY)
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endif()
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endif()
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endmacro()
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macro(_test_compiler_has_deprecated)
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# NOTE: Some Embarcadero compilers silently compile __declspec(deprecated)
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# without error, but this is not a documented feature and the attribute does
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# not actually generate any warnings.
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if(CMAKE_CXX_COMPILER_ID MATCHES Borland
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OR CMAKE_CXX_COMPILER_ID MATCHES Embarcadero
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OR CMAKE_CXX_COMPILER_ID MATCHES HP
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OR GCC_TOO_OLD
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OR CMAKE_CXX_COMPILER_ID MATCHES PGI
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OR CMAKE_CXX_COMPILER_ID MATCHES Watcom)
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set(COMPILER_HAS_DEPRECATED "" CACHE INTERNAL
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"Compiler support for a deprecated attribute")
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else()
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if (CMAKE_CXX_COMPILER_LOADED)
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_check_cxx_compiler_attribute("__attribute__((__deprecated__))"
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COMPILER_HAS_DEPRECATED_ATTR)
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if(COMPILER_HAS_DEPRECATED_ATTR)
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set(COMPILER_HAS_DEPRECATED "${COMPILER_HAS_DEPRECATED_ATTR}"
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CACHE INTERNAL "Compiler support for a deprecated attribute")
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else()
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_check_cxx_compiler_attribute("__declspec(deprecated)"
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COMPILER_HAS_DEPRECATED)
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endif()
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else()
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_check_c_compiler_attribute("__attribute__((__deprecated__))"
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COMPILER_HAS_DEPRECATED_ATTR)
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if(COMPILER_HAS_DEPRECATED_ATTR)
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set(COMPILER_HAS_DEPRECATED "${COMPILER_HAS_DEPRECATED_ATTR}"
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CACHE INTERNAL "Compiler support for a deprecated attribute")
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else()
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_check_c_compiler_attribute("__declspec(deprecated)"
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COMPILER_HAS_DEPRECATED)
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endif()
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endif()
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endif()
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endmacro()
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get_filename_component(_GENERATE_EXPORT_HEADER_MODULE_DIR
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"${CMAKE_CURRENT_LIST_FILE}" PATH)
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macro(_DO_SET_MACRO_VALUES TARGET_LIBRARY)
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set(DEFINE_DEPRECATED)
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set(DEFINE_EXPORT)
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set(DEFINE_IMPORT)
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set(DEFINE_NO_EXPORT)
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if (COMPILER_HAS_DEPRECATED_ATTR)
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set(DEFINE_DEPRECATED "__attribute__ ((__deprecated__))")
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elseif(COMPILER_HAS_DEPRECATED)
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set(DEFINE_DEPRECATED "__declspec(deprecated)")
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endif()
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get_property(type TARGET ${TARGET_LIBRARY} PROPERTY TYPE)
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if(NOT ${type} STREQUAL "STATIC_LIBRARY")
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if(WIN32 OR CYGWIN)
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set(DEFINE_EXPORT "__declspec(dllexport)")
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set(DEFINE_IMPORT "__declspec(dllimport)")
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elseif(COMPILER_HAS_HIDDEN_VISIBILITY)
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set(DEFINE_EXPORT "__attribute__((visibility(\"default\")))")
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set(DEFINE_IMPORT "__attribute__((visibility(\"default\")))")
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set(DEFINE_NO_EXPORT "__attribute__((visibility(\"hidden\")))")
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endif()
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endif()
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endmacro()
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macro(_DO_GENERATE_EXPORT_HEADER TARGET_LIBRARY)
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# Option overrides
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set(options DEFINE_NO_DEPRECATED)
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set(oneValueArgs PREFIX_NAME BASE_NAME EXPORT_MACRO_NAME EXPORT_FILE_NAME
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DEPRECATED_MACRO_NAME NO_EXPORT_MACRO_NAME STATIC_DEFINE
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NO_DEPRECATED_MACRO_NAME CUSTOM_CONTENT_FROM_VARIABLE INCLUDE_GUARD_NAME)
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set(multiValueArgs)
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cmake_parse_arguments(_GEH "${options}" "${oneValueArgs}" "${multiValueArgs}"
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${ARGN})
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set(BASE_NAME "${TARGET_LIBRARY}")
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if(_GEH_BASE_NAME)
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set(BASE_NAME ${_GEH_BASE_NAME})
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endif()
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string(TOUPPER ${BASE_NAME} BASE_NAME_UPPER)
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string(TOLOWER ${BASE_NAME} BASE_NAME_LOWER)
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# Default options
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set(EXPORT_MACRO_NAME "${_GEH_PREFIX_NAME}${BASE_NAME_UPPER}_EXPORT")
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set(NO_EXPORT_MACRO_NAME "${_GEH_PREFIX_NAME}${BASE_NAME_UPPER}_NO_EXPORT")
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set(EXPORT_FILE_NAME "${CMAKE_CURRENT_BINARY_DIR}/${BASE_NAME_LOWER}_export.h")
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set(DEPRECATED_MACRO_NAME "${_GEH_PREFIX_NAME}${BASE_NAME_UPPER}_DEPRECATED")
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set(STATIC_DEFINE "${_GEH_PREFIX_NAME}${BASE_NAME_UPPER}_STATIC_DEFINE")
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set(NO_DEPRECATED_MACRO_NAME
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"${_GEH_PREFIX_NAME}${BASE_NAME_UPPER}_NO_DEPRECATED")
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if(_GEH_UNPARSED_ARGUMENTS)
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message(FATAL_ERROR "Unknown keywords given to GENERATE_EXPORT_HEADER(): \"${_GEH_UNPARSED_ARGUMENTS}\"")
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endif()
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if(_GEH_EXPORT_MACRO_NAME)
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set(EXPORT_MACRO_NAME ${_GEH_PREFIX_NAME}${_GEH_EXPORT_MACRO_NAME})
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endif()
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string(MAKE_C_IDENTIFIER ${EXPORT_MACRO_NAME} EXPORT_MACRO_NAME)
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if(_GEH_EXPORT_FILE_NAME)
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if(IS_ABSOLUTE ${_GEH_EXPORT_FILE_NAME})
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set(EXPORT_FILE_NAME ${_GEH_EXPORT_FILE_NAME})
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else()
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set(EXPORT_FILE_NAME "${CMAKE_CURRENT_BINARY_DIR}/${_GEH_EXPORT_FILE_NAME}")
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endif()
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endif()
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if(_GEH_DEPRECATED_MACRO_NAME)
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set(DEPRECATED_MACRO_NAME ${_GEH_PREFIX_NAME}${_GEH_DEPRECATED_MACRO_NAME})
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endif()
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string(MAKE_C_IDENTIFIER ${DEPRECATED_MACRO_NAME} DEPRECATED_MACRO_NAME)
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if(_GEH_NO_EXPORT_MACRO_NAME)
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set(NO_EXPORT_MACRO_NAME ${_GEH_PREFIX_NAME}${_GEH_NO_EXPORT_MACRO_NAME})
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endif()
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string(MAKE_C_IDENTIFIER ${NO_EXPORT_MACRO_NAME} NO_EXPORT_MACRO_NAME)
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if(_GEH_STATIC_DEFINE)
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set(STATIC_DEFINE ${_GEH_PREFIX_NAME}${_GEH_STATIC_DEFINE})
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endif()
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string(MAKE_C_IDENTIFIER ${STATIC_DEFINE} STATIC_DEFINE)
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if(_GEH_DEFINE_NO_DEPRECATED)
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set(DEFINE_NO_DEPRECATED 1)
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else()
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set(DEFINE_NO_DEPRECATED 0)
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endif()
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if(_GEH_NO_DEPRECATED_MACRO_NAME)
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set(NO_DEPRECATED_MACRO_NAME
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${_GEH_PREFIX_NAME}${_GEH_NO_DEPRECATED_MACRO_NAME})
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endif()
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string(MAKE_C_IDENTIFIER ${NO_DEPRECATED_MACRO_NAME} NO_DEPRECATED_MACRO_NAME)
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if(_GEH_INCLUDE_GUARD_NAME)
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set(INCLUDE_GUARD_NAME ${_GEH_INCLUDE_GUARD_NAME})
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else()
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set(INCLUDE_GUARD_NAME "${EXPORT_MACRO_NAME}_H")
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endif()
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get_target_property(EXPORT_IMPORT_CONDITION ${TARGET_LIBRARY} DEFINE_SYMBOL)
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if(NOT EXPORT_IMPORT_CONDITION)
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set(EXPORT_IMPORT_CONDITION ${TARGET_LIBRARY}_EXPORTS)
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endif()
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string(MAKE_C_IDENTIFIER ${EXPORT_IMPORT_CONDITION} EXPORT_IMPORT_CONDITION)
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if(_GEH_CUSTOM_CONTENT_FROM_VARIABLE)
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if(DEFINED "${_GEH_CUSTOM_CONTENT_FROM_VARIABLE}")
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set(CUSTOM_CONTENT "${${_GEH_CUSTOM_CONTENT_FROM_VARIABLE}}")
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else()
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set(CUSTOM_CONTENT "")
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endif()
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endif()
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configure_file("${_GENERATE_EXPORT_HEADER_MODULE_DIR}/exportheader.cmake.in"
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"${EXPORT_FILE_NAME}" @ONLY)
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endmacro()
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function(GENERATE_EXPORT_HEADER TARGET_LIBRARY)
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get_property(type TARGET ${TARGET_LIBRARY} PROPERTY TYPE)
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if(NOT ${type} STREQUAL "STATIC_LIBRARY"
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AND NOT ${type} STREQUAL "SHARED_LIBRARY"
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AND NOT ${type} STREQUAL "OBJECT_LIBRARY"
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AND NOT ${type} STREQUAL "MODULE_LIBRARY")
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message(WARNING "This macro can only be used with libraries")
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return()
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endif()
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_test_compiler_hidden_visibility()
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_test_compiler_has_deprecated()
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_do_set_macro_values(${TARGET_LIBRARY})
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_do_generate_export_header(${TARGET_LIBRARY} ${ARGN})
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endfunction()
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function(add_compiler_export_flags)
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if(NOT CMAKE_MINIMUM_REQUIRED_VERSION VERSION_LESS 2.8.12)
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message(DEPRECATION "The add_compiler_export_flags function is obsolete. Use the CXX_VISIBILITY_PRESET and VISIBILITY_INLINES_HIDDEN target properties instead.")
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endif()
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_test_compiler_hidden_visibility()
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_test_compiler_has_deprecated()
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option(USE_COMPILER_HIDDEN_VISIBILITY
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"Use HIDDEN visibility support if available." ON)
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mark_as_advanced(USE_COMPILER_HIDDEN_VISIBILITY)
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if(NOT (USE_COMPILER_HIDDEN_VISIBILITY AND COMPILER_HAS_HIDDEN_VISIBILITY))
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# Just return if there are no flags to add.
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return()
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endif()
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set (EXTRA_FLAGS "-fvisibility=hidden")
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if(COMPILER_HAS_HIDDEN_INLINE_VISIBILITY)
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set (EXTRA_FLAGS "${EXTRA_FLAGS} -fvisibility-inlines-hidden")
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endif()
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# Either return the extra flags needed in the supplied argument, or to the
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# CMAKE_CXX_FLAGS if no argument is supplied.
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|
if(ARGC GREATER 0)
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|
set(${ARGV0} "${EXTRA_FLAGS}" PARENT_SCOPE)
|
|
else()
|
|
string(APPEND CMAKE_CXX_FLAGS " ${EXTRA_FLAGS}")
|
|
set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS}" PARENT_SCOPE)
|
|
endif()
|
|
endfunction()
|