file(GENERATE): Fix using 'foo.tmp' as input for output 'foo'
Revise file(GENERATE) to use a random suffix on its temporary file name to avoid clobbering its own input.
Fixes: #20873 (closed)
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Revise file(GENERATE) to use a random suffix on its temporary file name to avoid clobbering its own input.
Fixes: #20873 (closed)