How to trace Makefile targets for troubleshooting?

Use make -d or make –debug[=flags] options: ‘-d’ Print debugging information in addition to normal processing. The debugging information says which files are being considered for remaking, which file-times are being compared and with what results, which files actually need to be remade, which implicit rules are considered and which are applied—everything interesting about how … Read more

Function “patsubst” in Makefile

In fact all is explained in the doc: Finds whitespace-separated words in TEXT … means that one or more spaces have to separate the words. … that match PATTERN … means that it select only words that match a pattern (which can include some spaces). … and replaces them with REPLACEMENT. means that the selected … Read more

How do you “echo” the last configure/make build –options within a source directory?

Incredibly, somehow everyone else missed the canonical way to do this, which has been around since 2 years before this thread began. 🙂 I wondered the same thing as the OP and was disappointed by the lack of proper (non-ugly) ways to do this when I read this thread. A few days later, while idly … Read more

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