diff options
Diffstat (limited to 'Modules/GenerateExportHeader.cmake')
| -rw-r--r-- | Modules/GenerateExportHeader.cmake | 367 |
1 files changed, 184 insertions, 183 deletions
diff --git a/Modules/GenerateExportHeader.cmake b/Modules/GenerateExportHeader.cmake index e6dcd00f7a..f2e4527664 100644 --- a/Modules/GenerateExportHeader.cmake +++ b/Modules/GenerateExportHeader.cmake @@ -1,189 +1,190 @@ # Distributed under the OSI-approved BSD 3-Clause License. See accompanying # file Copyright.txt or https://cmake.org/licensing for details. -#.rst: -# GenerateExportHeader -# -------------------- -# -# Function for generation of export macros for libraries -# -# This module provides the function GENERATE_EXPORT_HEADER(). -# -# The ``GENERATE_EXPORT_HEADER`` function can be used to generate a file -# suitable for preprocessor inclusion which contains EXPORT macros to be -# used in library classes:: -# -# GENERATE_EXPORT_HEADER( LIBRARY_TARGET -# [BASE_NAME <base_name>] -# [EXPORT_MACRO_NAME <export_macro_name>] -# [EXPORT_FILE_NAME <export_file_name>] -# [DEPRECATED_MACRO_NAME <deprecated_macro_name>] -# [NO_EXPORT_MACRO_NAME <no_export_macro_name>] -# [INCLUDE_GUARD_NAME <include_guard_name>] -# [STATIC_DEFINE <static_define>] -# [NO_DEPRECATED_MACRO_NAME <no_deprecated_macro_name>] -# [DEFINE_NO_DEPRECATED] -# [PREFIX_NAME <prefix_name>] -# [CUSTOM_CONTENT_FROM_VARIABLE <variable>] -# ) -# -# -# The target properties :prop_tgt:`CXX_VISIBILITY_PRESET <<LANG>_VISIBILITY_PRESET>` -# and :prop_tgt:`VISIBILITY_INLINES_HIDDEN` can be used to add the appropriate -# compile flags for targets. See the documentation of those target properties, -# and the convenience variables -# :variable:`CMAKE_CXX_VISIBILITY_PRESET <CMAKE_<LANG>_VISIBILITY_PRESET>` and -# :variable:`CMAKE_VISIBILITY_INLINES_HIDDEN`. -# -# By default ``GENERATE_EXPORT_HEADER()`` generates macro names in a file -# name determined by the name of the library. This means that in the -# simplest case, users of ``GenerateExportHeader`` will be equivalent to: -# -# .. code-block:: cmake -# -# set(CMAKE_CXX_VISIBILITY_PRESET hidden) -# set(CMAKE_VISIBILITY_INLINES_HIDDEN 1) -# add_library(somelib someclass.cpp) -# generate_export_header(somelib) -# install(TARGETS somelib DESTINATION ${LIBRARY_INSTALL_DIR}) -# install(FILES -# someclass.h -# ${PROJECT_BINARY_DIR}/somelib_export.h DESTINATION ${INCLUDE_INSTALL_DIR} -# ) -# -# -# And in the ABI header files: -# -# .. code-block:: c++ -# -# #include "somelib_export.h" -# class SOMELIB_EXPORT SomeClass { -# ... -# }; -# -# -# The CMake fragment will generate a file in the -# ``${CMAKE_CURRENT_BINARY_DIR}`` called ``somelib_export.h`` containing the -# macros ``SOMELIB_EXPORT``, ``SOMELIB_NO_EXPORT``, ``SOMELIB_DEPRECATED``, -# ``SOMELIB_DEPRECATED_EXPORT`` and ``SOMELIB_DEPRECATED_NO_EXPORT``. -# They will be followed by content taken from the variable specified by -# the ``CUSTOM_CONTENT_FROM_VARIABLE`` option, if any. -# The resulting file should be installed with other headers in the library. -# -# The ``BASE_NAME`` argument can be used to override the file name and the -# names used for the macros: -# -# .. code-block:: cmake -# -# add_library(somelib someclass.cpp) -# generate_export_header(somelib -# BASE_NAME other_name -# ) -# -# -# Generates a file called ``other_name_export.h`` containing the macros -# ``OTHER_NAME_EXPORT``, ``OTHER_NAME_NO_EXPORT`` and ``OTHER_NAME_DEPRECATED`` -# etc. -# -# The ``BASE_NAME`` may be overridden by specifying other options in the -# function. For example: -# -# .. code-block:: cmake -# -# add_library(somelib someclass.cpp) -# generate_export_header(somelib -# EXPORT_MACRO_NAME OTHER_NAME_EXPORT -# ) -# -# -# creates the macro ``OTHER_NAME_EXPORT`` instead of ``SOMELIB_EXPORT``, but -# other macros and the generated file name is as default: -# -# .. code-block:: cmake -# -# add_library(somelib someclass.cpp) -# generate_export_header(somelib -# DEPRECATED_MACRO_NAME KDE_DEPRECATED -# ) -# -# -# creates the macro ``KDE_DEPRECATED`` instead of ``SOMELIB_DEPRECATED``. -# -# If ``LIBRARY_TARGET`` is a static library, macros are defined without -# values. -# -# If the same sources are used to create both a shared and a static -# library, the uppercased symbol ``${BASE_NAME}_STATIC_DEFINE`` should be -# used when building the static library: -# -# .. code-block:: cmake -# -# add_library(shared_variant SHARED ${lib_SRCS}) -# add_library(static_variant ${lib_SRCS}) -# generate_export_header(shared_variant BASE_NAME libshared_and_static) -# set_target_properties(static_variant PROPERTIES -# COMPILE_FLAGS -DLIBSHARED_AND_STATIC_STATIC_DEFINE) -# -# This will cause the export macros to expand to nothing when building -# the static library. -# -# If ``DEFINE_NO_DEPRECATED`` is specified, then a macro -# ``${BASE_NAME}_NO_DEPRECATED`` will be defined This macro can be used to -# remove deprecated code from preprocessor output: -# -# .. code-block:: cmake -# -# option(EXCLUDE_DEPRECATED "Exclude deprecated parts of the library" FALSE) -# if (EXCLUDE_DEPRECATED) -# set(NO_BUILD_DEPRECATED DEFINE_NO_DEPRECATED) -# endif() -# generate_export_header(somelib ${NO_BUILD_DEPRECATED}) -# -# -# And then in somelib: -# -# .. code-block:: c++ -# -# class SOMELIB_EXPORT SomeClass -# { -# public: -# #ifndef SOMELIB_NO_DEPRECATED -# SOMELIB_DEPRECATED void oldMethod(); -# #endif -# }; -# -# .. code-block:: c++ -# -# #ifndef SOMELIB_NO_DEPRECATED -# void SomeClass::oldMethod() { } -# #endif -# -# -# If ``PREFIX_NAME`` is specified, the argument will be used as a prefix to -# all generated macros. -# -# For example: -# -# .. code-block:: cmake -# -# generate_export_header(somelib PREFIX_NAME VTK_) -# -# Generates the macros ``VTK_SOMELIB_EXPORT`` etc. -# -# :: -# -# ADD_COMPILER_EXPORT_FLAGS( [<output_variable>] ) -# -# The ``ADD_COMPILER_EXPORT_FLAGS`` function adds ``-fvisibility=hidden`` to -# :variable:`CMAKE_CXX_FLAGS <CMAKE_<LANG>_FLAGS>` if supported, and is a no-op -# on Windows which does not need extra compiler flags for exporting support. -# You may optionally pass a single argument to ``ADD_COMPILER_EXPORT_FLAGS`` -# that will be populated with the ``CXX_FLAGS`` required to enable visibility -# support for the compiler/architecture in use. -# -# This function is deprecated. Set the target properties -# :prop_tgt:`CXX_VISIBILITY_PRESET <<LANG>_VISIBILITY_PRESET>` and -# :prop_tgt:`VISIBILITY_INLINES_HIDDEN` instead. +#[=======================================================================[.rst: +GenerateExportHeader +-------------------- + +Function for generation of export macros for libraries + +This module provides the function GENERATE_EXPORT_HEADER(). + +The ``GENERATE_EXPORT_HEADER`` function can be used to generate a file +suitable for preprocessor inclusion which contains EXPORT macros to be +used in library classes:: + + GENERATE_EXPORT_HEADER( LIBRARY_TARGET + [BASE_NAME <base_name>] + [EXPORT_MACRO_NAME <export_macro_name>] + [EXPORT_FILE_NAME <export_file_name>] + [DEPRECATED_MACRO_NAME <deprecated_macro_name>] + [NO_EXPORT_MACRO_NAME <no_export_macro_name>] + [INCLUDE_GUARD_NAME <include_guard_name>] + [STATIC_DEFINE <static_define>] + [NO_DEPRECATED_MACRO_NAME <no_deprecated_macro_name>] + [DEFINE_NO_DEPRECATED] + [PREFIX_NAME <prefix_name>] + [CUSTOM_CONTENT_FROM_VARIABLE <variable>] + ) + + +The target properties :prop_tgt:`CXX_VISIBILITY_PRESET <<LANG>_VISIBILITY_PRESET>` +and :prop_tgt:`VISIBILITY_INLINES_HIDDEN` can be used to add the appropriate +compile flags for targets. See the documentation of those target properties, +and the convenience variables +:variable:`CMAKE_CXX_VISIBILITY_PRESET <CMAKE_<LANG>_VISIBILITY_PRESET>` and +:variable:`CMAKE_VISIBILITY_INLINES_HIDDEN`. + +By default ``GENERATE_EXPORT_HEADER()`` generates macro names in a file +name determined by the name of the library. This means that in the +simplest case, users of ``GenerateExportHeader`` will be equivalent to: + +.. code-block:: cmake + + set(CMAKE_CXX_VISIBILITY_PRESET hidden) + set(CMAKE_VISIBILITY_INLINES_HIDDEN 1) + add_library(somelib someclass.cpp) + generate_export_header(somelib) + install(TARGETS somelib DESTINATION ${LIBRARY_INSTALL_DIR}) + install(FILES + someclass.h + ${PROJECT_BINARY_DIR}/somelib_export.h DESTINATION ${INCLUDE_INSTALL_DIR} + ) + + +And in the ABI header files: + +.. code-block:: c++ + + #include "somelib_export.h" + class SOMELIB_EXPORT SomeClass { + ... + }; + + +The CMake fragment will generate a file in the +``${CMAKE_CURRENT_BINARY_DIR}`` called ``somelib_export.h`` containing the +macros ``SOMELIB_EXPORT``, ``SOMELIB_NO_EXPORT``, ``SOMELIB_DEPRECATED``, +``SOMELIB_DEPRECATED_EXPORT`` and ``SOMELIB_DEPRECATED_NO_EXPORT``. +They will be followed by content taken from the variable specified by +the ``CUSTOM_CONTENT_FROM_VARIABLE`` option, if any. +The resulting file should be installed with other headers in the library. + +The ``BASE_NAME`` argument can be used to override the file name and the +names used for the macros: + +.. code-block:: cmake + + add_library(somelib someclass.cpp) + generate_export_header(somelib + BASE_NAME other_name + ) + + +Generates a file called ``other_name_export.h`` containing the macros +``OTHER_NAME_EXPORT``, ``OTHER_NAME_NO_EXPORT`` and ``OTHER_NAME_DEPRECATED`` +etc. + +The ``BASE_NAME`` may be overridden by specifying other options in the +function. For example: + +.. code-block:: cmake + + add_library(somelib someclass.cpp) + generate_export_header(somelib + EXPORT_MACRO_NAME OTHER_NAME_EXPORT + ) + + +creates the macro ``OTHER_NAME_EXPORT`` instead of ``SOMELIB_EXPORT``, but +other macros and the generated file name is as default: + +.. code-block:: cmake + + add_library(somelib someclass.cpp) + generate_export_header(somelib + DEPRECATED_MACRO_NAME KDE_DEPRECATED + ) + + +creates the macro ``KDE_DEPRECATED`` instead of ``SOMELIB_DEPRECATED``. + +If ``LIBRARY_TARGET`` is a static library, macros are defined without +values. + +If the same sources are used to create both a shared and a static +library, the uppercased symbol ``${BASE_NAME}_STATIC_DEFINE`` should be +used when building the static library: + +.. code-block:: cmake + + add_library(shared_variant SHARED ${lib_SRCS}) + add_library(static_variant ${lib_SRCS}) + generate_export_header(shared_variant BASE_NAME libshared_and_static) + set_target_properties(static_variant PROPERTIES + COMPILE_FLAGS -DLIBSHARED_AND_STATIC_STATIC_DEFINE) + +This will cause the export macros to expand to nothing when building +the static library. + +If ``DEFINE_NO_DEPRECATED`` is specified, then a macro +``${BASE_NAME}_NO_DEPRECATED`` will be defined This macro can be used to +remove deprecated code from preprocessor output: + +.. code-block:: cmake + + option(EXCLUDE_DEPRECATED "Exclude deprecated parts of the library" FALSE) + if (EXCLUDE_DEPRECATED) + set(NO_BUILD_DEPRECATED DEFINE_NO_DEPRECATED) + endif() + generate_export_header(somelib ${NO_BUILD_DEPRECATED}) + + +And then in somelib: + +.. code-block:: c++ + + class SOMELIB_EXPORT SomeClass + { + public: + #ifndef SOMELIB_NO_DEPRECATED + SOMELIB_DEPRECATED void oldMethod(); + #endif + }; + +.. code-block:: c++ + + #ifndef SOMELIB_NO_DEPRECATED + void SomeClass::oldMethod() { } + #endif + + +If ``PREFIX_NAME`` is specified, the argument will be used as a prefix to +all generated macros. + +For example: + +.. code-block:: cmake + + generate_export_header(somelib PREFIX_NAME VTK_) + +Generates the macros ``VTK_SOMELIB_EXPORT`` etc. + +:: + + ADD_COMPILER_EXPORT_FLAGS( [<output_variable>] ) + +The ``ADD_COMPILER_EXPORT_FLAGS`` function adds ``-fvisibility=hidden`` to +:variable:`CMAKE_CXX_FLAGS <CMAKE_<LANG>_FLAGS>` if supported, and is a no-op +on Windows which does not need extra compiler flags for exporting support. +You may optionally pass a single argument to ``ADD_COMPILER_EXPORT_FLAGS`` +that will be populated with the ``CXX_FLAGS`` required to enable visibility +support for the compiler/architecture in use. + +This function is deprecated. Set the target properties +:prop_tgt:`CXX_VISIBILITY_PRESET <<LANG>_VISIBILITY_PRESET>` and +:prop_tgt:`VISIBILITY_INLINES_HIDDEN` instead. +#]=======================================================================] include(CheckCCompilerFlag) include(CheckCXXCompilerFlag) |