WSJT-X/map65/getsvn.cmake

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CMake
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find_package (Subversion)
if (Subversion_FOUND AND EXISTS ${PROJECT_SOURCE_DIR}/.svn)
# the FindSubversion.cmake module is part of the standard distribution
include (FindSubversion)
# extract working copy information for SOURCE_DIR into MY_XXX variables
Subversion_WC_INFO (${SOURCE_DIR} MY)
# write a file with the SVNVERSION define
file (WRITE svnversion.h.txt "#define SVNVERSION ${MY_WC_REVISION}\n")
else (Subversion_FOUND AND EXISTS ${PROJECT_SOURCE_DIR}/.svn)
file (WRITE svnversion.h.txt "#define SVNVERSION local\n")
endif (Subversion_FOUND AND EXISTS ${PROJECT_SOURCE_DIR}/.svn)
# copy the file to the final header only if the version changes
# reduces needless rebuilds
execute_process (COMMAND ${CMAKE_COMMAND} -E copy_if_different
svnversion.h.txt svnversion.h)