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# INSTALL_DIR - set it to the install destination
# INSTALL_PREFIX - set it to CMAKE_INSTALL_PREFIX
# CURRENT_BINARY_DIR - set it to CMAKE_CURRENT_BINARY_DIR
# FILENAME - the filename of the exports file
# get the absolute install directory, consider absolute and relative paths and also DESTDIR
if(IS_ABSOLUTE "${INSTALL_DIR}")
set(installDir "$ENV{DESTDIR}${INSTALL_DIR}")
else(IS_ABSOLUTE "${INSTALL_DIR}")
set(installDir "$ENV{DESTDIR}${INSTALL_PREFIX}/${INSTALL_DIR}")
endif(IS_ABSOLUTE "${INSTALL_DIR}")
set(installedExportsFile "${installDir}/${FILENAME}")
# if the file already exists at the install location, and if we can
# find the exports file in the build dir, read both, and if their contents differ,
# remove all configuration-specific exports files from the install dir, since
# they may create conflicts if the new targets have been added/targets have been
# removed/ targets have been renamed/ the namespace for the exported targets has changed
if(EXISTS "${installedExportsFile}")
if (${INSTALL_DIR} MATCHES "^(/)(.+)$")
set(binaryDirExportFileDir "_${CMAKE_MATCH_2}")
set(binaryDirExportsFile "${CURRENT_BINARY_DIR}/CMakeFiles/Export/${binaryDirExportFileDir}/${FILENAME}")
else (${INSTALL_DIR} MATCHES "^(/)(.+)$")
set(binaryDirExportsFile "${CURRENT_BINARY_DIR}/CMakeFiles/Export/${INSTALL_DIR}/${FILENAME}")
endif (${INSTALL_DIR} MATCHES "^(/)(.+)$")
if(EXISTS "${binaryDirExportsFile}")
file(READ "${installedExportsFile}" installedExportsFileContents)
file(READ "${binaryDirExportsFile}" binaryDirExportsFileContents)
if(NOT "${installedExportsFileContents}" STREQUAL "${binaryDirExportsFileContents}")
if("${FILENAME}" MATCHES "^(.+)(\\.cmake)$")
message(STATUS "Installed and new ${FILENAME} differ, removing installed ${CMAKE_MATCH_1}-*.cmake files")
file(GLOB files "${installDir}/${CMAKE_MATCH_1}-*.cmake")
file(REMOVE ${files})
endif("${FILENAME}" MATCHES "^(.+)(\\.cmake)$")
else(NOT "${installedExportsFileContents}" STREQUAL "${binaryDirExportsFileContents}")
message(STATUS "FILES are the same")
endif(NOT "${installedExportsFileContents}" STREQUAL "${binaryDirExportsFileContents}")
endif(EXISTS "${binaryDirExportsFile}")
endif(EXISTS "${installedExportsFile}")
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