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| Generates a rule to copy each source file from source directory
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| to destination directory.
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| Typical use -
| | This page has moved [https://gitlab.kitware.com/cmake/community/wikis/contrib/macros/CopyIfDifferent here]. |
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| <pre>
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| SET(SRC_FILES head1.h head2.h head3.h)
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| COPY_IF_DIFFERENT( /from_dir /to_dir ${SRC_FILES} IncludeTargets "Includes")
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| ADD_TARGET(CopyIncludes ALL DEPENDS ${IncludeTargets})
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| </pre>
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| will generate rules that look
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| ----
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| <pre>
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| CopyIncludes: $(CopyIncludes_DEPEND_LIBS) \
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| Include\head1.h \
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| Include\head2.h \
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| Include\head3.h
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| Include\head1.h:
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| @echo Building Copying head1.h /to_dir head1.h...
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| cmake.exe -E copy_if_different /from_dir/head1.h /to_dir/head1.h
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| </pre>
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| ----
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| <pre>
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| MACRO(COPY_IF_DIFFERENT FROM_DIR TO_DIR FILES TARGETS TAGS)
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| # Macro to implement copy_if_different for a list of files
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| # Arguments -
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| # FROM_DIR - this is the source directory
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| # TO_DIR - this is the destination directory
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| # FILES - names of the files to copy
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| # TODO: add globing.
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| # TARGETS - List of targets
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| # TAGS - Since only the file name is used
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| # to generate rules, pre-pend a user
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| # supplied tag to prevent duplicate rule errors.
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| SET(AddTargets "")
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| FOREACH(SRC ${FILES})
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| GET_FILENAME_COMPONENT(SRCFILE ${SRC} NAME)
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| # Command to copy the files to ${STEP1}/src, if changed.
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| SET(TARGET "${TAGS}/${SRCFILE}")
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| IF("${FROM_DIR}" STREQUAL "")
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| SET(FROM ${SRC})
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| ELSE("${FROM_DIR}" STREQUAL "")
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| SET(FROM ${FROM_DIR}/${SRC})
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| ENDIF("${FROM_DIR}" STREQUAL "")
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| IF("${TO_DIR}" STREQUAL "")
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| SET(TO ${SRCFILE})
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| ELSE("${TO_DIR}" STREQUAL "")
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| SET(TO ${TO_DIR}/${SRCFILE})
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| ENDIF("${TO_DIR}" STREQUAL "")
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| ADD_CUSTOM_COMMAND(
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| OUTPUT ${TARGET}
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| COMMAND ${CMAKE_COMMAND}
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| ARGS -E copy_if_different ${FROM} ${TO}
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| COMMENT "Copying ${SRCFILE} ${TO_DIR}"
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| )
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| SET(AddTargets ${AddTargets} ${TARGET})
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| ENDFOREACH(SRC ${FILES})
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| SET(${TARGETS} ${AddTargets})
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| ENDMACRO(COPY_IF_DIFFERENT FROM_DIR TO_DIR FILES TARGETS TAGS)
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| </pre>
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| {{CMake/Template/Footer}}
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| [[Category:CMakeMacro]]
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