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Add cmake cache var to allow for use of system openssl
Signed-off-by: Nicholas Frizzell <[email protected]>
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| # | ||
| # Copyright (c) Contributors to the Open 3D Engine Project. | ||
| # For complete copyright and license terms please see the LICENSE at the root of this distribution. | ||
| # | ||
| # SPDX-License-Identifier: Apache-2.0 OR MIT | ||
| # | ||
| # | ||
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| set(OPENSSL_O3DE_NAMESPACE "3rdParty::OpenSSL") | ||
| if (TARGET $${OPENSSL_O3DE_NAMESPACE}) | ||
| return() | ||
| endif() | ||
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| set(SSL_TARGETNAME "OpenSSL::SSL") | ||
| set(CRYPTO_TARGETNAME "OpenSSL::Crypto") | ||
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| if (LY_SYSTEM_PACKAGE_OpenSSL) | ||
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| # We need to temporarily override the CMAKE_MODULE_PATH to force it to search in the system directories | ||
| set(CMAKE_MODULE_PATH "") | ||
| find_package(OpenSSL) | ||
| unset(CMAKE_MODULE_PATH) | ||
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| if (NOT OpenSSL_FOUND) | ||
| message(FATAL_ERROR "Compiling on linux requires the development headers for OpenSSL. Try using your package manager to install the OpenSSL development libraries following https://wiki.openssl.org/index.php/Libssl_API") | ||
| else() | ||
| # OpenSSL targets should be considered as provided by the system | ||
| set_target_properties(OpenSSL::SSL OpenSSL::Crypto PROPERTIES LY_SYSTEM_LIBRARY TRUE) | ||
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| # Alias the O3DE name to the official name | ||
| add_library(3rdParty::OpenSSL ALIAS OpenSSL::SSL) | ||
| endif() | ||
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| else() | ||
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| # we're trying to be a drop-in replacement for the FindOpenSSL.cmake that is shipped | ||
| # with CMake itself, so we set the same variables with the same uppercase for compatibility | ||
| # for questions about these variables, see https://cmake.org/cmake/help/latest/module/FindOpenSSL.html | ||
| set(OPENSSL_FOUND True) | ||
| set(OPENSSL_INCLUDE_DIR $${CMAKE_CURRENT_LIST_DIR}/OpenSSL/include) | ||
| # c-only packages can be released containing only Release executables | ||
| set(OPENSSL_LIBS_DIR $${CMAKE_CURRENT_LIST_DIR}/OpenSSL/lib) | ||
| set(OPENSSL_CRYPTO_LIBRARY $${OPENSSL_LIBS_DIR}/libcrypto$${CMAKE_STATIC_LIBRARY_SUFFIX}) | ||
| set(OPENSSL_CRYPTO_LIBRARIES | ||
| $${OPENSSL_CRYPTO_LIBRARY} | ||
| ${CRYPTO_LIBRARY_DEPENDENCIES}) | ||
| set(OPENSSL_SSL_LIBRARY $${OPENSSL_LIBS_DIR}/libssl$${CMAKE_STATIC_LIBRARY_SUFFIX}) | ||
| set(OPENSSL_SSL_LIBRARIES | ||
| $${OPENSSL_SSL_LIBRARY} | ||
| $${OPENSSL_CRYPTO_LIBRARIES}) | ||
| set(OPENSSL_LIBRARIES $${OPENSSL_SSL_LIBRARIES}) | ||
| set(OPENSSL_VERSION "${OPENSSL_VERSION_STRING}") | ||
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| add_library($${CRYPTO_TARGETNAME} STATIC IMPORTED GLOBAL) | ||
| set_target_properties($${CRYPTO_TARGETNAME} PROPERTIES IMPORTED_LINK_INTERFACE_LANGUAGES "C") | ||
| set_target_properties($${CRYPTO_TARGETNAME} PROPERTIES IMPORTED_LOCATION "$${OPENSSL_CRYPTO_LIBRARY}") | ||
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| # anyone who links to the CRYPTO target also links to its dependencies: | ||
| target_link_libraries($${CRYPTO_TARGETNAME} INTERFACE ${CRYPTO_LIBRARY_DEPENDENCIES}) | ||
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| add_library($${SSL_TARGETNAME} STATIC IMPORTED GLOBAL) | ||
| set_target_properties($${SSL_TARGETNAME} PROPERTIES IMPORTED_LINK_INTERFACE_LANGUAGES "C") | ||
| set_target_properties($${SSL_TARGETNAME} PROPERTIES IMPORTED_LOCATION "$${OPENSSL_SSL_LIBRARY}") | ||
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| # anyone who links to the SSL target also links to CRYPTO since SSL depends on CRYPTO: | ||
| target_link_libraries($${SSL_TARGETNAME} INTERFACE $${CRYPTO_TARGETNAME}) | ||
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| # cmake < 3.21 and visual studio < 16.10 don't properly implement SYSTEM includes | ||
| # so we use O3DEs patched implementation if it is available and fallback to default if not. | ||
| # this is futureproof so that when O3DE no longer needs to define this and CMake's system | ||
| # works without fixes, O3DE can erase this implementation and this script will still function. | ||
| if (COMMAND ly_target_include_system_directories) | ||
| ly_target_include_system_directories(TARGET $${SSL_TARGETNAME} INTERFACE $${OPENSSL_INCLUDE_DIR}) | ||
| ly_target_include_system_directories(TARGET $${CRYPTO_TARGETNAME} INTERFACE $${OPENSSL_INCLUDE_DIR}) | ||
| else() | ||
| target_include_directories($${SSL_TARGETNAME} SYSTEM INTERFACE $${OPENSSL_INCLUDE_DIR}) | ||
| target_include_directories($${CRYPTO_TARGETNAME} SYSTEM INTERFACE $${OPENSSL_INCLUDE_DIR}) | ||
| endif() | ||
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| # alias the O3DE name to the official name: | ||
| add_library($${OPENSSL_O3DE_NAMESPACE} ALIAS $${SSL_TARGETNAME}) | ||
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| # if we're not in O3DE, it's also extremely helpful to show a message to logs that indicate that this | ||
| # library was successfully picked up, as opposed to the system one. | ||
| # A good way to know if you're in O3DE or not is that O3DE sets various cache variables before | ||
| # calling find_package, specifically, LY_VERSION_ENGINE_NAME is always set very early: | ||
| if (NOT LY_VERSION_ENGINE_NAME) | ||
| message(STATUS "Using O3DE's OpenSSL ($${OPENSSL_VERSION}) from $${CMAKE_CURRENT_LIST_DIR}") | ||
| endif() | ||
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| endif() # LY_SYSTEM_PACKAGE_OpenSSL |
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