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suff-rebuild.mk revision 1.1 
      1  1.1  rillig # $NetBSD: suff-rebuild.mk,v 1.1 2020/09/25 18:18:25 rillig Exp $
      2  1.1  rillig #
      3  1.1  rillig # Demonstrates what happens to transformation rules (called inference rules
      4  1.1  rillig # by POSIX) when all suffixes are deleted.
      5  1.1  rillig 
      6  1.1  rillig all: suff-rebuild-example
      7  1.1  rillig 
      8  1.1  rillig .SUFFIXES:
      9  1.1  rillig 
     10  1.1  rillig .SUFFIXES: .a .b .c
     11  1.1  rillig 
     12  1.1  rillig suff-rebuild-example.a:
     13  1.1  rillig 	: from nothing to a
     14  1.1  rillig 
     15  1.1  rillig .a.b:
     16  1.1  rillig 	: from a to b
     17  1.1  rillig .b.c:
     18  1.1  rillig 	: from b to c
     19  1.1  rillig .c:
     20  1.1  rillig 	: from c to nothing
     21  1.1  rillig 
     22  1.1  rillig # XXX: At a quick glance, the code in SuffScanTargets looks at if it were
     23  1.1  rillig # possible to delete the suffixes in the middle of the makefile, add back
     24  1.1  rillig # the suffixes from before, and have the transformation rules preserved.
     25  1.1  rillig #
     26  1.1  rillig # As of 2020-09-25, uncommenting the following line results in the error
     27  1.1  rillig # message "don't know how to make suff-rebuild-example" though.
     28  1.1  rillig #
     29  1.1  rillig #.SUFFIXES:
     30  1.1  rillig 
     31  1.1  rillig # Add the suffixes back.  It should not matter that the order of the suffixes
     32  1.1  rillig # is different from before.
     33  1.1  rillig .SUFFIXES: .c .b .a
     34