Rebuilding Makefile Targets Only When Dependency Content Changes
Posted on Sun 25 February 2018 in GNU Make • 6 min read
TL;DR:
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GNU Make decides whether to rebuild a ‘target’ file based on the modification times of ‘dependency’ files of the target.
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In some cases those dependencies’ modification times can change without the contents of the files changing, thus forcing an unnecessary rebuild.
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If
make
was to decide whether to rebuild by looking at the hash of the contents of the dependency files instead, it would only rebuild when the contents changed. -
I wrote a …
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