Add test coverage for deleted header files.

[Ralf Wildenhues]

I noticed that we don't even have testsuite coverage for the deleted
header file bug yet, except for an accidental one.  So here's a patch
to address that.

I think it's safe enough for maint; but anyway I will wait a bit for
comments or review before pushing.  By the way, if you would like me
to send patches in 'git am'-suitable format, e.g., for testing them,
please speak up, I'm all for making things equal for all if that helps
(I just need to reorder my workflow a bit then).

Thanks,
Ralf

    Add test coverage for deleted header files.
    
    * tests/depcomp6.test, tests/depcomp7.test: Update tests to
    also check for the deleted header bug.  If no dependency
    tracking mechanism could be found, SKIP rather than exit
    successfully.

diff --git a/tests/depcomp6.test b/tests/depcomp6.test
index 7fc651f..5713e7e 100755
--- a/tests/depcomp6.test
+++ b/tests/depcomp6.test
@@ -1,5 +1,5 @@
 #! /bin/sh
-# Copyright (C) 2006, 2010 Free Software Foundation, Inc.
+# Copyright (C) 2006, 2010, 2011 Free Software Foundation, Inc.
 #
 # This program is free software; you can redistribute it and/or modify
 # it under the terms of the GNU General Public License as published by
@@ -89,7 +89,8 @@ $AUTOMAKE -a
 $MAKE
 
 # check that dependency tracking works
-if grep 'depmode=none' Makefile; then :
+if grep 'depmode=none' Makefile; then
+  Exit 77
 else
   cd sub2
   $sleep
@@ -99,6 +100,12 @@ else
   # flag is active if a command within "&&" fails inside a compound
   # statement.
   if $MAKE; then Exit 1; else :; fi
+
+  # Ensure the deleted header bug is fixed.
+  rm -f sub3/ba3.h
+  sed 1d sub3/ba3.c >sub3/ba3.t
+  mv -f sub3/ba3.t sub3/ba3.c
+  $MAKE
 fi
 
 :
diff --git a/tests/depcomp7.test b/tests/depcomp7.test
index 695041a..3edbd71 100755
--- a/tests/depcomp7.test
+++ b/tests/depcomp7.test
@@ -1,5 +1,5 @@
 #! /bin/sh
-# Copyright (C) 2006, 2007, 2010 Free Software Foundation, Inc.
+# Copyright (C) 2006, 2007, 2010, 2011 Free Software Foundation, Inc.
 #
 # This program is free software; you can redistribute it and/or modify
 # it under the terms of the GNU General Public License as published by
@@ -77,7 +77,7 @@ cat >sub2/baz.h <<'END'
 extern int baz();
 END
 
-cat >sub2/sub3/ba3.c <<'END'
+cat >sub2/sub3/ba3.in <<'END'
 #include "ba3.h"
 int ba3() { return 0; }
 END
@@ -87,13 +87,16 @@ $ACLOCAL
 $AUTOCONF
 $AUTOMAKE -a
 
+st=0
 for staticshared in --disable-shared "" --disable-static; do
 
+  cp sub2/sub3/ba3.in sub2/sub3/ba3.c
   ./configure --enable-dependency-tracking $staticshared
   $MAKE
 
   # check that dependency tracking works
-  if grep 'depmode=none' Makefile; then :
+  if grep 'depmode=none' Makefile; then
+    st=77
   else
     cd sub2
     $sleep
@@ -103,6 +106,11 @@ for staticshared in --disable-shared "" --disable-static; 
do
     # flag is active if a command within "&&" fails inside a compound
     # statement.
     if $MAKE; then Exit 1; else :; fi
+
+    # Ensure the deleted header bug is fixed.
+    rm -f sub3/ba3.h
+    sed 1d sub3/ba3.in >sub3/ba3.c
+    $MAKE
     cd ..
   fi
 
@@ -114,4 +122,4 @@ for staticshared in --disable-shared "" --disable-static; do
 
 done
 
-:
+Exit $st