make - Support: sr #105252, Documentation of '4.14 Generating...

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sr #105252: Documentation of '4.14 Generating Prerequisites Automatically'

Submitter:	None
Submitted:	Thu 23 Mar 2006 03:22:13 PM UTC
Category:	None	Priority:	5 - Normal
Severity:	2 - Minor	Status:	None
Privacy:	Public	Assigned to:	None
Originator Email:	-email is unavailable-	Open/Closed:	Open
Operating System:	None

Thu 23 Mar 2006 03:52:56 PM UTC, comment #1:  Your suggestion is definitely clearer; unfortunately it doesn't work with older versions of GCC (GCC 2.x), which don't support the -MF or -MT flags. However, in the next release of GNU make (the one after 3.81) I'm planning on dropping support for K&R C and modifying the code to require a C89 compiler at least.  At that time it might be worthwhile to modify the manual to assume a GCC 3.x compiler as well.	Paul D. Smith <psmith>
Thu 23 Mar 2006 03:22:13 PM UTC, original submission:   In Section '4.14 Generating Prerequisites Automatically', to generate: main.o main.d : main.c defs.h you propose: %.d: %.c         @set -e; rm -f $@; \          $(CC) -M $(CPPFLAGS) $< > $@.$$$$; \          sed 's,\($*\)\.o[ :]*,\1.o $@ : ,g' < $@.$$$$ > $@; \          rm -f $@.$$$$ I think it may be clearer without the criptic sed command. I propose: %.d: %.c $(CC) -MM -MF $@ -MT $(<:.c=.o) -MT $@ $< producing the same output.	Anonymous

 

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