"mixed implicit and normal rules"
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"mixed implicit and normal rules"
by Peter Fales-4
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A user has complained about Makefiles that broke when we updated from
make-8.31 to make-3.82, demonstrated by this sample Makefile: ==================================== define ShowTargets echo "Hello World!" endef .PHONY : Help Help %:: @$(ShowTargets) ==================================== As I understand it, this is intended to catch the unspecifed target and print the help message. When make-3.81 is used by running "make" it prints Hello World! but 3.82 prints Makefile:7: *** mixed implicit and normal rules. Stop. I don't understand this well enough to know which is the correct behavior or what the error message is trying to tell me. Is 3.82 working as expected? Is there some more "correct" way to accomplish the same result? Thanks! -- Peter Fales Alcatel-Lucent Member of Technical Staff 1960 Lucent Lane Room: 9H-505 Naperville, IL 60566-7033 Email: Peter.Fales@... Phone: 630 979 8031 _______________________________________________ Bug-make mailing list Bug-make@... http://lists.gnu.org/mailman/listinfo/bug-make |
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Re: "mixed implicit and normal rules"
by Paul Smith-20
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On Wed, 2010-08-18 at 07:17 -0500, Peter Fales wrote:
> A user has complained about Makefiles that broke when we updated from > make-8.31 to make-3.82, demonstrated by this sample Makefile: > Help %:: > @$(ShowTargets) > As I understand it, this is intended to catch the unspecifed target and > print the help message. When make-3.81 is used by running "make" it prints > > Hello World Wouldn't using .DEFAULT be better/faster? A catch-anything pattern rule like that is very expensive. > but 3.82 prints > > Makefile:7: *** mixed implicit and normal rules. Stop. > > I don't understand this well enough to know which is the correct behavior > or what the error message is trying to tell me. Is 3.82 working > as expected? Is there some more "correct" way to accomplish the same > result? The previous behavior of mixing implicit and pattern rules in one line like that was never supported or documented, but due to a "hole" in the parser it worked for certain specific cases (for example, reversing that line so the pattern comes first would not work, nor would adding extra explicit targets after the pattern target). In 3.82, the parser was tightened in this respect and that "hole" was closed, hence you see this error. The right way to fix this is to write two rules: Help: @$(ShowTargets) %:: @$(ShowTargets) However, as above if you can use .DEFAULT it would be much more efficient. -- ------------------------------------------------------------------------------- Paul D. Smith <psmith@...> Find some GNU make tips at: http://www.gnu.org http://make.mad-scientist.net "Please remain calm...I may be mad, but I am a professional." --Mad Scientist _______________________________________________ Bug-make mailing list Bug-make@... http://lists.gnu.org/mailman/listinfo/bug-make |
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