share/mk/yacc.mk

   1 # $Id: yacc.mk,v 1.6 2011/06/10 22:45:46 sjg Exp $
   2
   3 #
   4 #       @(#) Copyright (c) 1999-2011, Simon J. Gerraty
   5 #
   6 #       This file is provided in the hope that it will
   7 #       be of use.  There is absolutely NO WARRANTY.
   8 #       Permission to copy, redistribute or otherwise
   9 #       use this file is hereby granted provided that
  10 #       the above copyright notice and this notice are
  11 #       left intact.
  12 #
  13 #       Please send copies of changes and bug-fixes to:
  14 #       sjg@crufty.net
  15 #
  16
  17 # this file contains rules to DTRT when SRCS contains foo.y or foo.c
  18 # when only a foo.y exists.
  19
  20 YACC?= yacc
  21 YFLAGS?= -v -t
  22 RM?= rm
  23
  24 YACC.y?= ${YACC} ${YFLAGS}
  25
  26 .if ${YACC.y:M-d} == "" || defined(NO_RENAME_Y_TAB_H)
  27
  28 .y.c:
  29         ${YACC.y} ${.IMPSRC}
  30         [ ! -s y.tab.c ] || mv y.tab.c ${.TARGET}
  31         ${RM} -f y.tab.[!h]
  32
  33 .else
  34
  35 # the touch of the .c is to ensure it is newer than .h (paranoia)
  36 .y.h:
  37         ${YACC.y} ${.IMPSRC}
  38         [ ! -s y.tab.c ] || mv y.tab.c ${.TARGET:T:R}.c
  39         [ ! -s y.tab.h ] || cmp -s y.tab.h ${.TARGET:T:R}.h \
  40                 || mv y.tab.h ${.TARGET:T:R}.h
  41         touch ${.TARGET:T:R}.c
  42         ${RM} -f y.tab.*
  43
  44 # Normally the .y.h rule does the work - to avoid races.
  45 # If for any reason the .c is lost but the .h remains,
  46 # regenerate the .c
  47 .y.c:   ${.TARGET:T:R}.h
  48         [ -s ${.TARGET} ] || { \
  49                 ${YACC.y} ${.IMPSRC} && \
  50                 { [ ! -s y.tab.c ] || mv y.tab.c ${.TARGET}; \
  51                 ${RM} y.tab.*; }; }
  52 .endif
  53
  54 beforedepend:   ${SRCS:T:M*.y:S/.y/.c/g}
  55
  56 CLEANFILES+= ${SRCS:T:M*.y:S/.y/.[ch]/g}
  57 CLEANFILES+= y.tab.[ch]