Commit cf23b927 authored by Guillaume Pasero's avatar Guillaume Pasero
Browse files

CI: temporary add the macro for generate_export_header

parent f71d5f61
# Distributed under the OSI-approved BSD 3-Clause License. See accompanying
# file Copyright.txt or https://cmake.org/licensing for details.
# Copyright (C) 2019 Centre National d'Etudes Spatiales (CNES)
# - Added support of XXX_EXPORT_TEMPLATE and XXX_EXPORT_EXPLICIT_TEMPLATE macros
#.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``, ``SOMELIB_DEPRECATED_NO_EXPORT``,
# ``SOMELIB_EXPORT_TEMPLATE`` and ``SOMELIB_EXPORT_EXPLICIT_TEMPLATE``.
# 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 ${NO_BUILD_DEPRECATED})
#
#
# And then in somelib:
#
# .. code-block:: c++
#
# class SOMELIB_EXPORT SomeClass
# {
# public:
# #ifndef SOMELIB_NO_DEPRECATED
# SOMELIB_DEPRECATED void oldMethod();
# #endif
# };
#
# .. code-block:: c++
#
# #ifndef SOMELIB_NO_DEPRECATED
# void SomeClass::oldMethod() { }
# #endif
#
#
# If ``PREFIX_NAME`` is specified, the argument will be used as a prefix to
# all generated macros.
#
# For example:
#
# .. code-block:: cmake
#
# generate_export_header(somelib PREFIX_NAME VTK_)
#
# Generates the macros ``VTK_SOMELIB_EXPORT`` etc.
#
# ::
#
# ADD_COMPILER_EXPORT_FLAGS( [<output_variable>] )
#
# The ``ADD_COMPILER_EXPORT_FLAGS`` function adds ``-fvisibility=hidden`` to
# :variable:`CMAKE_CXX_FLAGS <CMAKE_<LANG>_FLAGS>` if supported, and is a no-op
# on Windows which does not need extra compiler flags for exporting support.
# You may optionally pass a single argument to ``ADD_COMPILER_EXPORT_FLAGS``
# that will be populated with the ``CXX_FLAGS`` required to enable visibility
# support for the compiler/architecture in use.
#
# This function is deprecated. Set the target properties
# :prop_tgt:`CXX_VISIBILITY_PRESET <<LANG>_VISIBILITY_PRESET>` and
# :prop_tgt:`VISIBILITY_INLINES_HIDDEN` instead.
#
# The macro ``SOMELIB_EXPORT_TEMPLATE`` should be used when declaring template
# classes or functions. The macro ``SOMELIB_EXPORT_EXPLICIT_TEMPLATE`` should be
# used when compiling explicit instanciations of template classes/functions.
include(CheckCCompilerFlag)
include(CheckCXXCompilerFlag)
# TODO: Install this macro separately?
macro(_check_cxx_compiler_attribute _ATTRIBUTE _RESULT)
check_cxx_source_compiles("${_ATTRIBUTE} int somefunc() { return 0; }
int main() { return somefunc();}" ${_RESULT}
)
endmacro()
# TODO: Install this macro separately?
macro(_check_c_compiler_attribute _ATTRIBUTE _RESULT)
check_c_source_compiles("${_ATTRIBUTE} int somefunc() { return 0; }
int main() { return somefunc();}" ${_RESULT}
)
endmacro()
macro(_test_compiler_hidden_visibility)
if(CMAKE_COMPILER_IS_GNUCXX AND CMAKE_CXX_COMPILER_VERSION VERSION_LESS "4.2")
set(GCC_TOO_OLD TRUE)
elseif(CMAKE_COMPILER_IS_GNUCC AND CMAKE_C_COMPILER_VERSION VERSION_LESS "4.2")
set(GCC_TOO_OLD TRUE)
elseif(CMAKE_CXX_COMPILER_ID MATCHES Intel AND CMAKE_CXX_COMPILER_VERSION VERSION_LESS "12.0")
set(_INTEL_TOO_OLD TRUE)
endif()
# Exclude XL here because it misinterprets -fvisibility=hidden even though
# the check_cxx_compiler_flag passes
if(NOT GCC_TOO_OLD
AND NOT _INTEL_TOO_OLD
AND NOT WIN32
AND NOT CYGWIN
AND NOT CMAKE_CXX_COMPILER_ID MATCHES XL
AND NOT CMAKE_CXX_COMPILER_ID MATCHES PGI
AND NOT CMAKE_CXX_COMPILER_ID MATCHES Watcom)
if (CMAKE_CXX_COMPILER_LOADED)
check_cxx_compiler_flag(-fvisibility=hidden COMPILER_HAS_HIDDEN_VISIBILITY)
check_cxx_compiler_flag(-fvisibility-inlines-hidden
COMPILER_HAS_HIDDEN_INLINE_VISIBILITY)
else()
check_c_compiler_flag(-fvisibility=hidden COMPILER_HAS_HIDDEN_VISIBILITY)
check_c_compiler_flag(-fvisibility-inlines-hidden
COMPILER_HAS_HIDDEN_INLINE_VISIBILITY)
endif()
endif()
endmacro()
macro(_test_compiler_has_deprecated)
# NOTE: Some Embarcadero compilers silently compile __declspec(deprecated)
# without error, but this is not a documented feature and the attribute does
# not actually generate any warnings.
if(CMAKE_CXX_COMPILER_ID MATCHES Borland
OR CMAKE_CXX_COMPILER_ID MATCHES Embarcadero
OR CMAKE_CXX_COMPILER_ID MATCHES HP
OR GCC_TOO_OLD
OR CMAKE_CXX_COMPILER_ID MATCHES PGI
OR CMAKE_CXX_COMPILER_ID MATCHES Watcom)
set(COMPILER_HAS_DEPRECATED "" CACHE INTERNAL
"Compiler support for a deprecated attribute")
else()
if (CMAKE_CXX_COMPILER_LOADED)
_check_cxx_compiler_attribute("__attribute__((__deprecated__))"
COMPILER_HAS_DEPRECATED_ATTR)
if(COMPILER_HAS_DEPRECATED_ATTR)
set(COMPILER_HAS_DEPRECATED "${COMPILER_HAS_DEPRECATED_ATTR}"
CACHE INTERNAL "Compiler support for a deprecated attribute")
else()
_check_cxx_compiler_attribute("__declspec(deprecated)"
COMPILER_HAS_DEPRECATED)
endif()
else()
_check_c_compiler_attribute("__attribute__((__deprecated__))"
COMPILER_HAS_DEPRECATED_ATTR)
if(COMPILER_HAS_DEPRECATED_ATTR)
set(COMPILER_HAS_DEPRECATED "${COMPILER_HAS_DEPRECATED_ATTR}"
CACHE INTERNAL "Compiler support for a deprecated attribute")
else()
_check_c_compiler_attribute("__declspec(deprecated)"
COMPILER_HAS_DEPRECATED)
endif()
endif()
endif()
endmacro()
get_filename_component(_GENERATE_EXPORT_HEADER_MODULE_DIR
"${CMAKE_CURRENT_LIST_FILE}" PATH)
macro(_DO_SET_MACRO_VALUES TARGET_LIBRARY)
set(DEFINE_DEPRECATED)
set(DEFINE_EXPORT)
set(DEFINE_IMPORT)
set(DEFINE_NO_EXPORT)
if (COMPILER_HAS_DEPRECATED_ATTR)
set(DEFINE_DEPRECATED "__attribute__ ((__deprecated__))")
elseif(COMPILER_HAS_DEPRECATED)
set(DEFINE_DEPRECATED "__declspec(deprecated)")
endif()
get_property(type TARGET ${TARGET_LIBRARY} PROPERTY TYPE)
if(NOT ${type} STREQUAL "STATIC_LIBRARY")
if(WIN32 OR CYGWIN)
set(DEFINE_EXPORT "__declspec(dllexport)")
set(DEFINE_IMPORT "__declspec(dllimport)")
set(DEFINE_TEMPLATE_EXPORT "")
set(DEFINE_TEMPLATE_IMPORT "")
set(DEFINE_EXPLICIT_TEMPLATE_EXPORT ${DEFINE_EXPORT})
set(DEFINE_EXPLICIT_TEMPLATE_IMPORT ${DEFINE_IMPORT})
elseif(COMPILER_HAS_HIDDEN_VISIBILITY)
set(DEFINE_EXPORT "__attribute__((visibility(\"default\")))")
set(DEFINE_IMPORT "__attribute__((visibility(\"default\")))")
set(DEFINE_TEMPLATE_EXPORT ${DEFINE_EXPORT})
set(DEFINE_TEMPLATE_IMPORT ${DEFINE_IMPORT})
set(DEFINE_EXPLICIT_TEMPLATE_EXPORT "")
set(DEFINE_EXPLICIT_TEMPLATE_IMPORT "")
set(DEFINE_NO_EXPORT "__attribute__((visibility(\"hidden\")))")
endif()
endif()
endmacro()
macro(_DO_GENERATE_EXPORT_HEADER TARGET_LIBRARY)
# Option overrides
set(options DEFINE_NO_DEPRECATED)
set(oneValueArgs PREFIX_NAME BASE_NAME EXPORT_MACRO_NAME EXPORT_FILE_NAME
DEPRECATED_MACRO_NAME NO_EXPORT_MACRO_NAME STATIC_DEFINE
NO_DEPRECATED_MACRO_NAME CUSTOM_CONTENT_FROM_VARIABLE INCLUDE_GUARD_NAME)
set(multiValueArgs)
cmake_parse_arguments(_GEH "${options}" "${oneValueArgs}" "${multiValueArgs}"
${ARGN})
set(BASE_NAME "${TARGET_LIBRARY}")
if(_GEH_BASE_NAME)
set(BASE_NAME ${_GEH_BASE_NAME})
endif()
string(TOUPPER ${BASE_NAME} BASE_NAME_UPPER)
string(TOLOWER ${BASE_NAME} BASE_NAME_LOWER)
# Default options
set(EXPORT_MACRO_NAME "${_GEH_PREFIX_NAME}${BASE_NAME_UPPER}_EXPORT")
set(EXPORT_TEMPLATE_MACRO_NAME "${EXPORT_TEMPLATE_MACRO_NAME}_TEMPLATE")
set(EXPORT_EXPLICIT_TEMPLATE_MACRO_NAME "${EXPORT_MACRO_NAME}_EXPLICIT_TEMPLATE")
set(NO_EXPORT_MACRO_NAME "${_GEH_PREFIX_NAME}${BASE_NAME_UPPER}_NO_EXPORT")
set(EXPORT_FILE_NAME "${CMAKE_CURRENT_BINARY_DIR}/${BASE_NAME_LOWER}_export.h")
set(DEPRECATED_MACRO_NAME "${_GEH_PREFIX_NAME}${BASE_NAME_UPPER}_DEPRECATED")
set(STATIC_DEFINE "${_GEH_PREFIX_NAME}${BASE_NAME_UPPER}_STATIC_DEFINE")
set(NO_DEPRECATED_MACRO_NAME
"${_GEH_PREFIX_NAME}${BASE_NAME_UPPER}_NO_DEPRECATED")
if(_GEH_UNPARSED_ARGUMENTS)
message(FATAL_ERROR "Unknown keywords given to GENERATE_EXPORT_HEADER(): \"${_GEH_UNPARSED_ARGUMENTS}\"")
endif()
if(_GEH_EXPORT_MACRO_NAME)
set(EXPORT_MACRO_NAME ${_GEH_PREFIX_NAME}${_GEH_EXPORT_MACRO_NAME})
set(EXPORT_TEMPLATE_MACRO_NAME "${EXPORT_MACRO_NAME}_TEMPLATE")
set(EXPORT_EXPLICIT_TEMPLATE_MACRO_NAME "${EXPORT_MACRO_NAME}_EXPLICIT_TEMPLATE")
endif()
string(MAKE_C_IDENTIFIER ${EXPORT_MACRO_NAME} EXPORT_MACRO_NAME)
if(_GEH_EXPORT_FILE_NAME)
if(IS_ABSOLUTE ${_GEH_EXPORT_FILE_NAME})
set(EXPORT_FILE_NAME ${_GEH_EXPORT_FILE_NAME})
else()
set(EXPORT_FILE_NAME "${CMAKE_CURRENT_BINARY_DIR}/${_GEH_EXPORT_FILE_NAME}")
endif()
endif()
if(_GEH_DEPRECATED_MACRO_NAME)
set(DEPRECATED_MACRO_NAME ${_GEH_PREFIX_NAME}${_GEH_DEPRECATED_MACRO_NAME})
endif()
string(MAKE_C_IDENTIFIER ${DEPRECATED_MACRO_NAME} DEPRECATED_MACRO_NAME)
if(_GEH_NO_EXPORT_MACRO_NAME)
set(NO_EXPORT_MACRO_NAME ${_GEH_PREFIX_NAME}${_GEH_NO_EXPORT_MACRO_NAME})
endif()
string(MAKE_C_IDENTIFIER ${NO_EXPORT_MACRO_NAME} NO_EXPORT_MACRO_NAME)
if(_GEH_STATIC_DEFINE)
set(STATIC_DEFINE ${_GEH_PREFIX_NAME}${_GEH_STATIC_DEFINE})
endif()
string(MAKE_C_IDENTIFIER ${STATIC_DEFINE} STATIC_DEFINE)
if(_GEH_DEFINE_NO_DEPRECATED)
set(DEFINE_NO_DEPRECATED 1)
else()
set(DEFINE_NO_DEPRECATED 0)
endif()
if(_GEH_NO_DEPRECATED_MACRO_NAME)
set(NO_DEPRECATED_MACRO_NAME
${_GEH_PREFIX_NAME}${_GEH_NO_DEPRECATED_MACRO_NAME})
endif()
string(MAKE_C_IDENTIFIER ${NO_DEPRECATED_MACRO_NAME} NO_DEPRECATED_MACRO_NAME)
if(_GEH_INCLUDE_GUARD_NAME)
set(INCLUDE_GUARD_NAME ${_GEH_INCLUDE_GUARD_NAME})
else()
set(INCLUDE_GUARD_NAME "${EXPORT_MACRO_NAME}_H")
endif()
get_target_property(EXPORT_IMPORT_CONDITION ${TARGET_LIBRARY} DEFINE_SYMBOL)
if(NOT EXPORT_IMPORT_CONDITION)
set(EXPORT_IMPORT_CONDITION ${TARGET_LIBRARY}_EXPORTS)
endif()
string(MAKE_C_IDENTIFIER ${EXPORT_IMPORT_CONDITION} EXPORT_IMPORT_CONDITION)
if(_GEH_CUSTOM_CONTENT_FROM_VARIABLE)
if(DEFINED "${_GEH_CUSTOM_CONTENT_FROM_VARIABLE}")
set(CUSTOM_CONTENT "${${_GEH_CUSTOM_CONTENT_FROM_VARIABLE}}")
else()
set(CUSTOM_CONTENT "")
endif()
endif()
configure_file("${_GENERATE_EXPORT_HEADER_MODULE_DIR}/exportheader.cmake.in"
"${EXPORT_FILE_NAME}" @ONLY)
endmacro()
function(GENERATE_EXPORT_HEADER TARGET_LIBRARY)
get_property(type TARGET ${TARGET_LIBRARY} PROPERTY TYPE)
if(NOT ${type} STREQUAL "STATIC_LIBRARY"
AND NOT ${type} STREQUAL "SHARED_LIBRARY"
AND NOT ${type} STREQUAL "OBJECT_LIBRARY"
AND NOT ${type} STREQUAL "MODULE_LIBRARY")
message(WARNING "This macro can only be used with libraries")
return()
endif()
_test_compiler_hidden_visibility()
_test_compiler_has_deprecated()
_do_set_macro_values(${TARGET_LIBRARY})
_do_generate_export_header(${TARGET_LIBRARY} ${ARGN})
endfunction()
function(add_compiler_export_flags)
if(NOT CMAKE_MINIMUM_REQUIRED_VERSION VERSION_LESS 2.8.12)
message(DEPRECATION "The add_compiler_export_flags function is obsolete. Use the CXX_VISIBILITY_PRESET and VISIBILITY_INLINES_HIDDEN target properties instead.")
endif()
_test_compiler_hidden_visibility()
_test_compiler_has_deprecated()
option(USE_COMPILER_HIDDEN_VISIBILITY
"Use HIDDEN visibility support if available." ON)
mark_as_advanced(USE_COMPILER_HIDDEN_VISIBILITY)
if(NOT (USE_COMPILER_HIDDEN_VISIBILITY AND COMPILER_HAS_HIDDEN_VISIBILITY))
# Just return if there are no flags to add.
return()
endif()
set (EXTRA_FLAGS "-fvisibility=hidden")
if(COMPILER_HAS_HIDDEN_INLINE_VISIBILITY)
set (EXTRA_FLAGS "${EXTRA_FLAGS} -fvisibility-inlines-hidden")
endif()
# Either return the extra flags needed in the supplied argument, or to the
# CMAKE_CXX_FLAGS if no argument is supplied.
if(ARGC GREATER 0)
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()
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