CMake/Help/command/ctest_update.rst

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ctest_update
------------
Update the work tree from version control.
::
ctest_update([SOURCE source] [RETURN_VALUE res] [QUIET])
Updates the given source directory and stores results in Update.xml.
If no SOURCE is given, the CTEST_SOURCE_DIRECTORY variable is used.
The RETURN_VALUE option specifies a variable in which to store the
result, which is the number of files updated or -1 on error.
If QUIET is specified then CTest will suppress most non-error
messages that it would have otherwise printed to the console.
CTest will still report the new revision of the repository
and any conflicting files that were found.