Gnu make assignment wildcard function

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Managing Projects with GNU Make, 3rd Edition by Robert Mecklenburg

Wildcard PitfallUp: Wildcard expansion happens automatically in rules. But function expansion does not normally take place when a gnu make assignment wildcard function gnu make assignment wildcard function set, or inside the arguments of a function. If assignment wildcard want to do gnu make expansion in such places, you need to use the wildcard function, like this:.

This string, used anywhere in a makefile, gnu make assignment wildcard function replaced by a space-separated list here names of existing files that match one of the given file name patterns.

If no existing file name matches a pattern, then that pattern is omitted from the output of the wildcard function. Note that this is different from how unmatched wildcards behave in rules, gnu make assignment wildcard function they are used verbatim rather than ignored see Wildcard Pitfall.

One use of the wildcard function is to get a list of all the C source files in a directory, like this:. Here we have used another function, patsubst.

See College essays online help students gnu make assignment wildcard function String Substitution and Analysis. Thus, a makefile to compile all C gnu make assignment wildcard function files in the directory and then link them together could be written as follows:.

This takes advantage of the implicit rule for compiling C programs, so there is no need to write explicit rules for compiling the files.

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