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Occasionally a file which would otherwise be called ‘source’
(e.g. a C ‘.h’ file) is actually derived from some other file.
Such files should be listed in the BUILT_SOURCES variable.
BUILT_SOURCES is actually a bit of a misnomer, as any file which
must be created early in the build process can be listed in this
variable.
A source file listed in BUILT_SOURCES is created before the other
all targets are made. However, such a source file is not
compiled unless explicitly requested by mentioning it in some other
‘_SOURCES’ variable.
So, for instance, if you had header files which were created by a script
run at build time, then you would list these headers in
BUILT_SOURCES, to ensure that they would be built before any
other compilations (perhaps ones using these headers) were started.