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CMake/Modules/GenerateExportHeader.cmake

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# - Function for generation of export macros for libraries
# This module provides the function GENERATE_EXPORT_HEADER() and the
# accompanying ADD_COMPILER_EXPORT_FLAGS() function.
#
# 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>]
# [STATIC_DEFINE <static_define>]
# [NO_DEPRECATED_MACRO_NAME <no_deprecated_macro_name>]
# [DEFINE_NO_DEPRECATED]
# [PREFIX_NAME <prefix_name>]
# )
#
# ADD_COMPILER_EXPORT_FLAGS( [<output_variable>] )
#
# By default GENERATE_EXPORT_HEADER() generates macro names in a file name
# determined by the name of the library. The ADD_COMPILER_EXPORT_FLAGS function
# adds -fvisibility=hidden to CMAKE_CXX_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 required CXX_FLAGS required to enable visibility support
# for the compiler/architecture in use.
#
# This means that in the simplest case, users of these functions will be
# equivalent to:
#
# add_compiler_export_flags()
# 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:
#
# #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.
# 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
#
# 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 specifiying other options in the function.
# For example:
#
# 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.
#
# 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
#
# 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.
#
# 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 ${NO_BUILD_DEPRECATED})
#
# And then in somelib:
#
# class SOMELIB_EXPORT SomeClass
# {
# public:
# #ifndef SOMELIB_NO_DEPRECATED
# SOMELIB_DEPRECATED void oldMethod();
# #endif
# };
#
# #ifndef SOMELIB_NO_DEPRECATED
# void SomeClass::oldMethod() { }
# #endif
#
# If PREFIX_NAME is specified, the argument will be used as a prefix to all
# generated macros.
#
# For example:
#
# generate_export_header(somelib PREFIX_NAME VTK_)
#
# Generates the macros VTK_SOMELIB_EXPORT etc.
#=============================================================================
# Copyright 2011 Stephen Kelly <steveire@gmail.com>
#
# Distributed under the OSI-approved BSD License (the "License");
# see accompanying file Copyright.txt for details.
#
# This software is distributed WITHOUT ANY WARRANTY; without even the
# implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
# See the License for more information.
#=============================================================================
# (To distribute this file outside of CMake, substitute the full
# License text for the above reference.)
include(CMakeParseArguments)
include(CheckCXXCompilerFlag)
# TODO: Install this macro separately?
macro(_check_cxx_compiler_attribute _ATTRIBUTE _RESULT)
check_cxx_source_compiles("${_ATTRIBUTE} int somefunc() { return 0; }
int main() { return somefunc();}" ${_RESULT}
)
endmacro()
macro(_test_compiler_hidden_visibility)
if(CMAKE_COMPILER_IS_GNUCXX AND CMAKE_CXX_COMPILER_VERSION VERSION_LESS "4.2")
set(GCC_TOO_OLD TRUE)
elseif(CMAKE_COMPILER_IS_GNUC AND CMAKE_C_COMPILER_VERSION VERSION_LESS "4.2")
set(GCC_TOO_OLD TRUE)
elseif(CMAKE_CXX_COMPILER_ID MATCHES Intel AND CMAKE_CXX_COMPILER_VERSION VERSION_LESS "12.0")
set(_INTEL_TOO_OLD TRUE)
endif()
# Exclude XL here because it misinterprets -fvisibility=hidden even though
# the check_cxx_compiler_flag passes
# http://www.cdash.org/CDash/testDetails.php?test=109109951&build=1419259
if(NOT GCC_TOO_OLD
AND NOT _INTEL_TOO_OLD
AND NOT WIN32
AND NOT CYGWIN
AND NOT "${CMAKE_CXX_COMPILER_ID}" MATCHES XL
AND NOT "${CMAKE_CXX_COMPILER_ID}" MATCHES PGI
AND NOT "${CMAKE_CXX_COMPILER_ID}" MATCHES Watcom)
check_cxx_compiler_flag(-fvisibility=hidden COMPILER_HAS_HIDDEN_VISIBILITY)
check_cxx_compiler_flag(-fvisibility-inlines-hidden
COMPILER_HAS_HIDDEN_INLINE_VISIBILITY)
option(USE_COMPILER_HIDDEN_VISIBILITY
"Use HIDDEN visibility support if available." ON)
mark_as_advanced(USE_COMPILER_HIDDEN_VISIBILITY)
endif()
endmacro()
macro(_test_compiler_has_deprecated)
if("${CMAKE_CXX_COMPILER_ID}" MATCHES Borland
OR "${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()
_check_cxx_compiler_attribute("__attribute__((__deprecated__))"
COMPILER_HAS_DEPRECATED_ATTR)
if(COMPILER_HAS_DEPRECATED_ATTR)
set(COMPILER_HAS_DEPRECATED "${COMPILER_HAS_DEPRECATED_ATTR}"
CACHE INTERNAL "Compiler support for a deprecated attribute")
else()
_check_cxx_compiler_attribute("__declspec(deprecated)"
COMPILER_HAS_DEPRECATED)
endif()
endif()
endmacro()
get_filename_component(_GENERATE_EXPORT_HEADER_MODULE_DIR
"${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 ${type} STREQUAL "STATIC_LIBRARY")
if(WIN32)
set(DEFINE_EXPORT "__declspec(dllexport)")
set(DEFINE_IMPORT "__declspec(dllimport)")
elseif(COMPILER_HAS_HIDDEN_VISIBILITY AND USE_COMPILER_HIDDEN_VISIBILITY)
set(DEFINE_EXPORT "__attribute__((visibility(\"default\")))")
set(DEFINE_IMPORT "__attribute__((visibility(\"default\")))")
set(DEFINE_NO_EXPORT "__attribute__((visibility(\"hidden\")))")
endif()
endif()
endmacro()
macro(_DO_GENERATE_EXPORT_HEADER TARGET_LIBRARY)
# Option overrides
set(options DEFINE_NO_DEPRECATED)
set(oneValueArgs PREFIX_NAME BASE_NAME EXPORT_MACRO_NAME EXPORT_FILE_NAME
DEPRECATED_MACRO_NAME NO_EXPORT_MACRO_NAME STATIC_DEFINE
NO_DEPRECATED_MACRO_NAME)
set(multiValueArgs)
cmake_parse_arguments(_GEH "${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}${BASE_NAME_UPPER}_EXPORT")
set(NO_EXPORT_MACRO_NAME "${_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})
endif()
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()
if(_GEH_NO_EXPORT_MACRO_NAME)
set(NO_EXPORT_MACRO_NAME ${_GEH_PREFIX_NAME}${_GEH_NO_EXPORT_MACRO_NAME})
endif()
if(_GEH_STATIC_DEFINE)
set(STATIC_DEFINE ${_GEH_PREFIX_NAME}${_GEH_STATIC_DEFINE})
endif()
if(_GEH_DEFINE_NO_DEPRECATED)
set(DEFINE_NO_DEPRECATED TRUE)
endif()
if(_GEH_NO_DEPRECATED_MACRO_NAME)
set(NO_DEPRECATED_MACRO_NAME
${_GEH_PREFIX_NAME}${_GEH_NO_DEPRECATED_MACRO_NAME})
endif()
set(INCLUDE_GUARD_NAME "${EXPORT_MACRO_NAME}_H")
get_target_property(EXPORT_IMPORT_CONDITION ${TARGET_LIBRARY} DEFINE_SYMBOL)
if(NOT EXPORT_IMPORT_CONDITION)
set(EXPORT_IMPORT_CONDITION ${TARGET_LIBRARY}_EXPORTS)
endif()
configure_file("${_GENERATE_EXPORT_HEADER_MODULE_DIR}/exportheader.cmake.in"
"${EXPORT_FILE_NAME}" @ONLY)
endmacro()
function(GENERATE_EXPORT_HEADER TARGET_LIBRARY)
get_property(type TARGET ${TARGET_LIBRARY} PROPERTY TYPE)
if(${type} STREQUAL "MODULE")
message(WARNING "This macro should not be used with libraries of type MODULE")
return()
endif()
if(NOT ${type} STREQUAL "STATIC_LIBRARY" AND NOT ${type} STREQUAL "SHARED_LIBRARY")
message(WARNING "This macro can only be used with libraries")
return()
endif()
_test_compiler_hidden_visibility()
_test_compiler_has_deprecated()
_do_set_macro_values(${TARGET_LIBRARY})
_do_generate_export_header(${TARGET_LIBRARY} ${ARGN})
endfunction()
function(add_compiler_export_flags)
_test_compiler_hidden_visibility()
_test_compiler_has_deprecated()
if(NOT (USE_COMPILER_HIDDEN_VISIBILITY AND COMPILER_HAS_HIDDEN_VISIBILITY))
# Just return if there are no flags to add.
return()
endif()
set (EXTRA_FLAGS "-fvisibility=hidden")
if(COMPILER_HAS_HIDDEN_INLINE_VISIBILITY)
set (EXTRA_FLAGS "${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(ARGV0)
set(${ARGV0} "${EXTRA_FLAGS}" PARENT_SCOPE)
else()
set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} ${EXTRA_FLAGS}" PARENT_SCOPE)
endif()
endfunction()
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