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Now, if user changes a header file and presses "Build", source files that depend on the changed files aren't rebuilt. It would be fine if they did (in managed projects). Now in such a situation, the only remedy is full rebuild of the entire project, which isn't very convenient. Some users claim that Code::Blocks and KDevelop has this capability. This obviously concerns only managed projects.
Here is a link to the related discussion on a Linux forum (unfortunately, in Russian only) http://www.linux.org.ru/view-message.jsp?msgid=2714497&lastmod=1209911559690
I believe that's doable; for example, language model tracks such dependencies: as soon as a header is changed, the source files that (directly or indirectly) includes this headers are reparsed. Design might be as follows: declare an SPI in project bridge (cnd.api.project), that allows project system getting dependency information; implement this SPI on the language model site; use this info in the project system.
*** This issue has been marked as a duplicate of 134806 ***