bug#24256: new module for grep's DFA matcher

[Paul Eggert]

Jim Meyering wrote:
> That is probably because you have a stray dfa.o file laying around.
> Since that corresponds to a now-VC-removed dfa.c file, "make clean"
> fails to remove the .o file. Just remove it manually and the test
> should then pass.

Right you are, thanks. Running 'make clean' fixes the problem.

Though it exposes a new problem. 'make clean; make dist' fails when checking 
tight scope, with the following symptoms. Perhaps a missing dependency?

space_tab
0.01 space_tab
tight_scope
make[4]: Entering directory '/home/eggert/src/gnu/grep/src'
  CC       grep.o
In file included from system.h:26:0,
                 from grep.c:29:
../lib/binary-io.h: In function 'set_binary_mode':
../lib/binary-io.h:57:10: error: 'O_BINARY' undeclared (first use in this 
function)
   return O_BINARY;
          ^
../lib/binary-io.h:57:10: note: each undeclared identifier is reported only once 
for each function it appears in
In file included from grep.c:29:0:
system.h: At top level:
system.h:27:24: fatal error: configmake.h: No such file or directory
compilation terminated.
Makefile:1344: recipe for target 'grep.o' failed
make[4]: *** [grep.o] Error 1
make[4]: Leaving directory '/home/eggert/src/gnu/grep/src'
maint.mk:1578: recipe for target 'sc_tight_scope' failed
make[3]: *** [sc_tight_scope] Error 1
make[3]: Leaving directory '/home/eggert/src/gnu/grep'
Makefile:1710: recipe for target 'run-syntax-check' failed
make[2]: *** [run-syntax-check] Error 2
make[2]: Leaving directory '/home/eggert/src/gnu/grep'
Makefile:1386: recipe for target 'distdir' failed
make[1]: *** [distdir] Error 2
make[1]: Leaving directory '/home/eggert/src/gnu/grep'
Makefile:1487: recipe for target 'dist' failed
make: *** [dist] Error 2
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