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suff-rebuild.mk revision 1.4 
      1 # $NetBSD: suff-rebuild.mk,v 1.4 2020/11/21 08:51:57 rillig Exp $
      2 #
      3 # Demonstrates what happens to transformation rules (called inference rules
      4 # by POSIX) when all suffixes are deleted.
      5 
      6 all: suff-rebuild-example
      7 
      8 .SUFFIXES:
      9 
     10 .SUFFIXES: .a .b .c
     11 
     12 suff-rebuild-example.a:
     13 	: Making ${.TARGET} out of nothing.
     14 
     15 .a.b:
     16 	: Making ${.TARGET} from ${.IMPSRC}.
     17 .b.c:
     18 	: Making ${.TARGET} from ${.IMPSRC}.
     19 .c:
     20 	: Making ${.TARGET} from ${.IMPSRC}.
     21 
     22 # XXX: At a quick glance, the code in SuffUpdateTarget looks as if it were
     23 # possible to delete the suffixes in the middle of the makefile, add back
     24 # the suffixes from before, and have the transformation rules preserved.
     25 #
     26 # As of 2020-09-25, uncommenting the following line results in the error
     27 # message "don't know how to make suff-rebuild-example" though.
     28 #
     29 #.SUFFIXES:
     30 
     31 # Add the suffixes back.  It should not matter that the order of the suffixes
     32 # is different from before.
     33 .SUFFIXES: .c .b .a
     34