![]() ![]() ![]() Note: If the daemon is shutdown (system reboot) then the state is now unknown and all glob patterns will need to be re-evaluated. This solution offloads the overhead of continuous glob evaluation to a background process and will have the best of both worlds at the cost of increased complexity for the systems engineer. Monitor Filesystem Changes - A build system can spin up a background daemon to listen for file system changes that would impact the results of previous glob evaluations.This design has better incremental build performance, but can no longer guarantee an incremental build is equivalent to a full build. A build may detect deleted files, but will miss new files unless a user remembers to "force" a rebuild by touching the build definition. Cache globbed evaluation - The build will evaluate the glob patterns only when the build definition changes.This adds overhead to incremental builds and slows down the inner development loop for every invocation. Glob Source always evaluated - The build will re-evaluate ALL glob patterns for ALL incremental build to determine if the file system has changed since the last build.The big downside is large build definitions that increase maintenance costs. Any change to the input file set will invalidate the build definition and force a rebuild. Explicitly define all inputs - Allows for the build to know exactly what it needs to build and allows for very fast incremental build checks.There are four general ways to handle incremental builds: Globbing is amazing from a usability perspective but makes it very hard to have performant incremental builds with guaranteed correctness. ![]() This is a design decision where build systems must choose between incremental build speed and correctness over usability and CMake has to work toward the least common denominator. ![]()
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |