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8.4 Built sources

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 are also not compiled by default. You must explicitly mention them in some other ‘_SOURCES’ variable for this to happen.

Note that, in some cases, BUILT_SOURCES will work in somewhat surprising ways. In order to get the built sources to work with automatic dependency tracking, the Makefile must depend on $(BUILT_SOURCES). This can cause these sources to be rebuilt at what might seem like funny times.