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@@ -13,10 +13,13 @@ endif()
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# Even though expat itself exports it as lowercase expat, older cmake (and cmake's built-in targets)
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# expect uppercase. So we define both, for backwards compat:
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+# See https://cmake.org/cmake/help/latest/module/FindEXPAT.html for how CMake exports it.
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+# in order to support old and new packages, we'll export it as CMake exports it but also
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+# alias that to older legacy ones.
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if (WIN32)
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# on windows, expat adds the nonstandard 'lib' prefix and MD, dMD suffixes for
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- # Multighreaded Dynamic CRT and debug Multithreaded Dynamic CRT
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+ # Multithreaded Dynamic CRT and debug Multithreaded Dynamic CRT
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# We don't use the debug version since its a pure C library with no C++ and thus will
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# not have an ITERATOR_DEBUG_LEVEL conflict
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set(PREFIX_TO_USE "lib")
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@@ -27,13 +30,19 @@ else()
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set(SUFFIX_TO_USE ${CMAKE_STATIC_LIBRARY_SUFFIX})
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endif()
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+set(EXPAT_VERSION_STRING "2.4.2")
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+set(EXPAT_VERSION "2.4.2") # backward compat
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+set(expat_VERSION "2.4.2") # backward compat
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+
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set(EXPAT_LIBRARY ${CMAKE_CURRENT_LIST_DIR}/expat/lib/${PREFIX_TO_USE}expat${SUFFIX_TO_USE})
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set(expat_LIBRARY ${EXPAT_LIBRARY})
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+set(EXPAT_LIBRARIES ${EXPAT_LIBRARY}) # compatibility with CMake's FindEXPAT.cmake
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set(EXPAT_INCLUDE_DIR ${CMAKE_CURRENT_LIST_DIR}/expat/include)
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set(expat_INCLUDE_DIR ${EXPAT_INCLUDE_DIR})
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+set(EXPAT_INCLUDE_DIRS ${EXPAT_INCLUDE_DIR}) #compatibility with CMake's FindEXPAT file.
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-set(EXPAT_FOUND TRUE)
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+set(EXPAT_FOUND TRUE) #compatibility with CMake's FindEXPAT file.
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set(expat_FOUND TRUE)
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add_library(expat::expat STATIC IMPORTED GLOBAL)
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@@ -53,12 +62,13 @@ endif()
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add_library(3rdParty::expat ALIAS expat::expat)
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# upppercase for compat:
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-add_library(EXPAT::EXPAT ALIAS expat::expat)
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+add_library(EXPAT::EXPAT ALIAS expat::expat) #compatibility with CMake's FindEXPAT file.
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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
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# library was successfully picked up, as opposed to the system one.
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# A good way to know if you're in O3DE or not is that O3DE sets various cache variables before
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# calling find_package, specifically, LY_VERSION_ENGINE_NAME is always set very early:
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+
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if (NOT LY_VERSION_ENGINE_NAME)
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message(STATUS "Using O3DE expat ${expat_VERSION} from ${CMAKE_CURRENT_LIST_DIR}")
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endif()
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Nicholas Lawson