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CMake/Modules/GenerateExportHeader.cmake
Andreas Schuh be5a8973c3 GenerateExportHeader: Do not define DEFINE_NO_DEPRECATED (#16022) 
Previously we allowed this definition to persist outside our header.
This would cause conflicts across multiple such headers because the name
was always the same.  Fix this by avoiding the definition altogether.
2016-03-17 10:40:24 -04:00

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CMake
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#.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>]
# [STATIC_DEFINE <static_define>]
# [NO_DEPRECATED_MACRO_NAME <no_deprecated_macro_name>]
# [DEFINE_NO_DEPRECATED]
# [PREFIX_NAME <prefix_name>]
# )
#
#
# 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``. 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 specifiying 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.
#=============================================================================
# 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();}" ${_RESULT}
)
endmacro()
macro(_test_compiler_hidden_visibility)
if(CMAKE_COMPILER_IS_GNUCXX AND CMAKE_CXX_COMPILER_VERSION VERSION_LESS "4.2")
set(GCC_TOO_OLD TRUE)
elseif(CMAKE_COMPILER_IS_GNUC AND CMAKE_C_COMPILER_VERSION VERSION_LESS "4.2")
set(GCC_TOO_OLD TRUE)
elseif(CMAKE_CXX_COMPILER_ID MATCHES Intel AND CMAKE_CXX_COMPILER_VERSION VERSION_LESS "12.0")
set(_INTEL_TOO_OLD TRUE)
endif()
# Exclude XL here because it misinterprets -fvisibility=hidden even though
# the check_cxx_compiler_flag passes
if(NOT GCC_TOO_OLD
AND NOT _INTEL_TOO_OLD
AND NOT WIN32
AND NOT CYGWIN
AND NOT CMAKE_CXX_COMPILER_ID MATCHES XL
AND NOT CMAKE_CXX_COMPILER_ID MATCHES PGI
AND NOT CMAKE_CXX_COMPILER_ID MATCHES Watcom)
check_cxx_compiler_flag(-fvisibility=hidden COMPILER_HAS_HIDDEN_VISIBILITY)
check_cxx_compiler_flag(-fvisibility-inlines-hidden
COMPILER_HAS_HIDDEN_INLINE_VISIBILITY)
option(USE_COMPILER_HIDDEN_VISIBILITY
"Use HIDDEN visibility support if available." ON)
mark_as_advanced(USE_COMPILER_HIDDEN_VISIBILITY)
endif()
endmacro()
macro(_test_compiler_has_deprecated)
# NOTE: Some Embarcadero compilers silently compile __declspec(deprecated)
# without error, but this is not a documented feature and the attribute does
# not actually generate any warnings.
if(CMAKE_CXX_COMPILER_ID MATCHES Borland
OR CMAKE_CXX_COMPILER_ID MATCHES Embarcadero
OR CMAKE_CXX_COMPILER_ID MATCHES HP
OR GCC_TOO_OLD
OR CMAKE_CXX_COMPILER_ID MATCHES PGI
OR CMAKE_CXX_COMPILER_ID MATCHES Watcom)
set(COMPILER_HAS_DEPRECATED "" CACHE INTERNAL
"Compiler support for a deprecated attribute")
else()
_check_cxx_compiler_attribute("__attribute__((__deprecated__))"
COMPILER_HAS_DEPRECATED_ATTR)
if(COMPILER_HAS_DEPRECATED_ATTR)
set(COMPILER_HAS_DEPRECATED "${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 ${type} STREQUAL "STATIC_LIBRARY")
if(WIN32 OR CYGWIN)
set(DEFINE_EXPORT "__declspec(dllexport)")
set(DEFINE_IMPORT "__declspec(dllimport)")
elseif(COMPILER_HAS_HIDDEN_VISIBILITY AND USE_COMPILER_HIDDEN_VISIBILITY)
set(DEFINE_EXPORT "__attribute__((visibility(\"default\")))")
set(DEFINE_IMPORT "__attribute__((visibility(\"default\")))")
set(DEFINE_NO_EXPORT "__attribute__((visibility(\"hidden\")))")
endif()
endif()
endmacro()
macro(_DO_GENERATE_EXPORT_HEADER TARGET_LIBRARY)
# Option overrides
set(options DEFINE_NO_DEPRECATED)
set(oneValueArgs PREFIX_NAME BASE_NAME EXPORT_MACRO_NAME EXPORT_FILE_NAME
DEPRECATED_MACRO_NAME NO_EXPORT_MACRO_NAME STATIC_DEFINE
NO_DEPRECATED_MACRO_NAME)
set(multiValueArgs)
cmake_parse_arguments(_GEH "${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()
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 ${NO_DEPRECATED_MACRO_NAME} NO_DEPRECATED_MACRO_NAME)
set(INCLUDE_GUARD_NAME "${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()
string(MAKE_C_IDENTIFIER ${EXPORT_IMPORT_CONDITION} EXPORT_IMPORT_CONDITION)
configure_file("${_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} ${ARGN})
endfunction()
function(add_compiler_export_flags)
if(NOT CMAKE_MINIMUM_REQUIRED_VERSION VERSION_LESS 2.8.12)
message(DEPRECATION "The add_compiler_export_flags function is obsolete. Use the CXX_VISIBILITY_PRESET and VISIBILITY_INLINES_HIDDEN target properties instead.")
endif()
_test_compiler_hidden_visibility()
_test_compiler_has_deprecated()
if(NOT (USE_COMPILER_HIDDEN_VISIBILITY AND COMPILER_HAS_HIDDEN_VISIBILITY))
# Just return if there are no flags to add.
return()
endif()
set (EXTRA_FLAGS "-fvisibility=hidden")
if(COMPILER_HAS_HIDDEN_INLINE_VISIBILITY)
set (EXTRA_FLAGS "${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()
set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} ${EXTRA_FLAGS}" PARENT_SCOPE)
endif()
endfunction()
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