Messages in this thread Patch in this message | | | Date | Tue, 8 Feb 2005 03:02:28 +0000 | From | Matthew Wilcox <> | Subject | [PATCH] Makefiles are not built using a Fortran compiler |
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David Holland pointed out that Make has a lot of implicit suffix rules built in and you can disable them by setting ".SUFFIXES:". As an example, checking the debugging information shows we no longer try to compile anything from a '.f' suffix. This turns out to be good for a 15% speedup on a build with nothing to do; down from 29.1 seconds to 24.7 seconds on my K6.
Signed-off-by: Matthew Wilcox <matthew@wil.cx>
Index: Makefile =================================================================== RCS file: /var/cvs/linux-2.6/Makefile,v retrieving revision 1.338 diff -u -p -r1.338 Makefile --- Makefile 6 Feb 2005 06:43:49 -0000 1.338 +++ Makefile 8 Feb 2005 02:39:28 -0000 @@ -4,6 +4,8 @@ SUBLEVEL = 11 EXTRAVERSION =-rc3-pa3 NAME=Woozy Numbat +.SUFFIXES: + # *DOCUMENTATION* # To see a list of typical targets execute "make help" # More info can be located in ./README Index: scripts/Makefile.build =================================================================== RCS file: /var/cvs/linux-2.6/scripts/Makefile.build,v retrieving revision 1.9 diff -u -p -r1.9 Makefile.build --- scripts/Makefile.build 12 Jan 2005 20:18:19 -0000 1.9 +++ scripts/Makefile.build 8 Feb 2005 02:39:28 -0000 @@ -4,6 +4,8 @@ src := $(obj) +.SUFFIXES: + .PHONY: __build __build: -- "Next the statesmen will invent cheap lies, putting the blame upon the nation that is attacked, and every man will be glad of those conscience-soothing falsities, and will diligently study them, and refuse to examine any refutations of them; and thus he will by and by convince himself that the war is just, and will thank God for the better sleep he enjoys after this process of grotesque self-deception." -- Mark Twain - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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