t/yacc-depend.sh

   1 #! /bin/sh
   2 # Copyright (C) 2001-2012 Free Software Foundation, Inc.
   3 #
   4 # This program is free software; you can redistribute it and/or modify
   5 # it under the terms of the GNU General Public License as published by
   6 # the Free Software Foundation; either version 2, or (at your option)
   7 # any later version.
   8 #
   9 # This program is distributed in the hope that it will be useful,
  10 # but WITHOUT ANY WARRANTY; without even the implied warranty of
  11 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12 # GNU General Public License for more details.
  13 #
  14 # You should have received a copy of the GNU General Public License
  15 # along with this program.  If not, see <http://www.gnu.org/licenses/>.
  16
  17 # Make sure depcomp does not needlessly update headers for yacc rules.
  18 # Report from Paolo Bonzini.
  19
  20 required='cc yacc'
  21 . ./defs || exit 1
  22
  23 cat >> configure.ac << 'END'
  24 AC_PROG_CC
  25 AC_PROG_YACC
  26 AC_OUTPUT
  27 END
  28
  29 cat > Makefile.am << 'END'
  30 bin_PROGRAMS = foo
  31 AM_YFLAGS = -d
  32 foo_SOURCES = foo.y main.c
  33 BUILT_SOURCES = foo.h
  34 END
  35
  36 cat > foo.y << 'END'
  37 %{
  38 int yylex () { return 0; }
  39 void yyerror (char *s) { return; }
  40 %}
  41 %token TOKEN
  42 %%
  43 foobar : 'f' 'o' 'o' 'b' 'a' 'r' {};
  44 END
  45
  46
  47 cat > main.c << 'END'
  48 #include "foo.h"
  49 int main(void)
  50 {
  51   return yyparse ();
  52 }
  53 END
  54
  55 $ACLOCAL
  56 $AUTOCONF
  57 $AUTOMAKE -a
  58
  59 # Try to enable dependency tracking if possible, even if that means
  60 # using slow dependency extractors.
  61 ./configure --enable-dependency-tracking
  62 $MAKE
  63 ls -l # For debugging.
  64
  65 # Make sure foo.h is not updated if not really needed.
  66 $sleep
  67 : > my-timestamp
  68 $sleep
  69 touch foo.y
  70 $MAKE
  71 stat my-timestamp foo.* || : # For debugging.
  72 is_newest my-timestamp foo.h
  73
  74 # Make sure foo.h is updated if needed.
  75 $sleep
  76 sed 's/TOKEN/TEKON/g' foo.y > t
  77 mv -f t foo.y
  78 $MAKE
  79 stat my-timestamp foo.* || : # For debugging.
  80 is_newest foo.h my-timestamp
  81
  82 :