Managing projects with GNU make by Robert William Mecklenburg; Andrew Oram

Managing projects with GNU make by Robert William Mecklenburg; Andrew Oram

By Robert William Mecklenburg; Andrew Oram

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Unfortunately, it seems the state of the art in source code control and modern software engineering have left make behind. I’ve never found a use for the source control support in make, nor have I seen it used in other production software. I do not recommend the use of this feature. There are a number of reasons for this. First, the source control tools supported by make, RCS and SCCS, although valuable and venerable tools in their day, have largely been supplanted by CVS, the Concurrent Version System, or proprietary tools.

A a prerequisite of count_words make will update our library before linking the executable. Notice one small irritation, however. All members of the archive are replaced even if they have not been modified. o $(AR) $(ARFLGS) $@ $? If you use $? instead of $^, make will pass only those objects files that are newer than the target to ar. Can we do better still? Maybe, but maybe not. make has support for updating individual files within an archive, executing one ar command for each object file member, but before we go delving into those details there are several points worth noting about this style of building libraries.

Then source wouldn’t get recompiled and the whole mess started again. GNU make solved this last niggling problem with a cool feature and a simple algorithm. First, the algorithm. h Generating this rule can be accomplished with a pattern rule and a (fairly ugly) command script (this is taken directly from the GNU make manual):* * This is an impressive little command script, but I think it requires some explanation. First, we use the C compiler with the -M option to create a temporary file containing the dependencies for this target.

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