deps: 'subdir-object' option now works when foo_SOURCES contains $(var)

Following a suggestions of Johan Kristensen, we have config.status use
'make' invocations rather than Makefile-parsing 'sed' hacks to bootstrap
the dependency-tracking '.Po' and '.Plo' makefile fragments. To handle
the inclusion of such files that are still missing when make is first
we basically generate a temporary Makefile without these includes, and
call 'make' on that Makefile.

This fixes the serious bug bug#13928, which was an hard blocker to make the
behavior mandated by the 'subdir-object' active by default (which we want
to do in Automake 2.0).

The issue has also been reported in bug#15919.

* NEWS, THANKS: Update.
* bin/automake.in (handle_languages): Add a trailing "marking" comment
("# am--include-marker") to the generated Makefile lines issuing 'include'
directives for the dependency-tracking '.Po' and '.Plo' makefile fragments.
Also rename the generated Makefile variable 'am__depfiles_maybe' to the
clearer 'am__maybe_remake_depfiles'.
Minor unrelated refactoring.
* lib/am/configure.am: Adjust to account for the 'am__depfiles_maybe' ->
'am__maybe_remake_depfiles' renaming.
* lib/am/depend.am: Add rules to generate a dummy version of all the
dependency-tracking '.Po' and '.Plo' makefile fragments.
* m4/depout.m4: Use make invocations rather than Makefile-parsing sed hacks
to bootstrap the dependency-tracking '.Po' and '.Plo' makefile fragments.
We still use some sed trickery in order to remove the inclusion of the
still non existing .Po and .Plo files from the Makefile we invoke make
upon; this is done stripping lines that contain the magic string
"# am--include-marker".
* m4/make.m4 (AM_MAKE_INCLUDE): Given that now automake generates Makefiles
containing include statements with trailing comment, adjust the checks done
here to make sure $MAKE support that; e.g., "include foo.mk # comment"
rather than just "include foo.mk".
Also refactor and adjust to leave better debugging info in config.log.
* t/postproc.sh: Rename ...
* t/depend-postproc.sh: ... to this, and adjust and enhance.
* t/list-of-tests.mk (handwritten_TESTS): Adjust.
(XFAIL_TESTS): Remove 't/subobj-indir-pr13928.sh', which is now succeeding.
* t/subobj-indir-pr13928.sh: Simplify slightly, now that we expect it to
pass.
* t/depcomp8a.sh: Adjust grepping check to account for the changes in
the generated Makefile, and tp be somewhat more robust in light of possible
future modifications.
* t/depcomp8b.sh: Likewise.
* t/subobj11b.sh: Likewise.
* t/subobj11c.sh: Likewise.
* t/extra-sources.sh: Likewise.
* t/lex-depend-grep.sh: Likewise.
* t/lex-depend-cxx.sh: Add a command to help debugging in case of test
failure.

Helped-by: Johan Kristensen <johankristensen@gmail.com>
Signed-off-by: Stefano Lattarini <stefano.lattarini@gmail.com>

1 files changed, 34 insertions, 44 deletions

diff --git a/m4/depout.m4 b/m4/depout.m4
index 0032e8ed4..c3936a71d 100644
--- a/m4/depout.m4
+++ b/m4/depout.m4
@@ -6,7 +6,6 @@
 # gives unlimited permission to copy and/or distribute it,
 # with or without modifications, as long as this notice is preserved.
 
-
 # _AM_OUTPUT_DEPENDENCY_COMMANDS
 # ------------------------------
 AC_DEFUN([_AM_OUTPUT_DEPENDENCY_COMMANDS],
@@ -14,49 +13,41 @@ AC_DEFUN([_AM_OUTPUT_DEPENDENCY_COMMANDS],
   # Older Autoconf quotes --file arguments for eval, but not when files
   # are listed without --file.  Let's play safe and only enable the eval
   # if we detect the quoting.
-  case $CONFIG_FILES in
-  *\'*) eval set x "$CONFIG_FILES" ;;
-  *)   set x $CONFIG_FILES ;;
-  esac
+  # TODO: see whether this extra hack can be removed once we start
+  # requiring Autoconf 2.70 or later.
+  AS_CASE([$CONFIG_FILES],
+          [*\'*], [eval set x "$CONFIG_FILES"],
+          [*], [set x $CONFIG_FILES])
   shift
-  for mf
+  # Used to flag and report bootstrapping failures.
+  am_rc=0
+  for am_mf
   do
     # Strip MF so we end up with the name of the file.
-    mf=`echo "$mf" | sed -e 's/:.*$//'`
-    # Check whether this is an Automake generated Makefile or not.
-    # We used to match only the files named 'Makefile.in', but
-    # some people rename them; so instead we look at the file content.
-    # Grep'ing the first line is not enough: some people post-process
-    # each Makefile.in and add a new line on top of each file to say so.
-    # Grep'ing the whole file is not good either: AIX grep has a line
+    am_mf=`AS_ECHO(["$am_mf"]) | sed -e 's/:.*$//'`
+    # Check whether this is an Automake generated Makefile which includes
+    # dependency-tracking related rules and includes.
+    # Grep'ing the whole file directly is not great: AIX grep has a line
     # limit of 2048, but all sed's we know have understand at least 4000.
-    if sed -n 's,^#.*generated by automake.*,X,p' "$mf" | grep X >/dev/null 2>&1; then
-      dirpart=`AS_DIRNAME("$mf")`
-    else
-      continue
-    fi
-    # Extract the definition of DEPDIR, am__include, and am__quote
-    # from the Makefile without running 'make'.
-    DEPDIR=`sed -n 's/^DEPDIR = //p' < "$mf"`
-    test -z "$DEPDIR" && continue
-    am__include=`sed -n 's/^am__include = //p' < "$mf"`
-    test -z "$am__include" && continue
-    am__quote=`sed -n 's/^am__quote = //p' < "$mf"`
-    # Find all dependency output files, they are included files with
-    # $(DEPDIR) in their names.  We invoke sed twice because it is the
-    # simplest approach to changing $(DEPDIR) to its actual value in the
-    # expansion.
-    for file in `sed -n "
-      s/^$am__include $am__quote\(.*(DEPDIR).*\)$am__quote"'$/\1/p' <"$mf" | \
-	 sed -e 's/\$(DEPDIR)/'"$DEPDIR"'/g'`; do
-      # Make sure the directory exists.
-      test -f "$dirpart/$file" && continue
-      fdir=`AS_DIRNAME(["$file"])`
-      AS_MKDIR_P([$dirpart/$fdir])
-      # echo "creating $dirpart/$file"
-      echo '# dummy' > "$dirpart/$file"
-    done
+    sed -n 's,^am--depfiles:.*,X,p' "$am_mf" | grep X >/dev/null 2>&1 \
+      || continue
+    am_dirpart=`AS_DIRNAME(["$am_mf"])`
+    am_filepart=`AS_BASENAME(["$am_mf"])`
+    AM_RUN_LOG([cd "$am_dirpart" \
+      && sed -e '/# am--include-marker/d' "$am_filepart" \
+        | $MAKE -f - am--depfiles]) || am_rc=$?
   done
+  if test $am_rc -ne 0; then
+    AC_MSG_FAILURE([Something went wrong bootstrapping makefile fragments
+    for automatic dependency tracking.  Try re-running configure with the
+    '--disable-dependency-tracking' option to at least be able to build
+    the package (albeit without support for automatic dependency tracking).])
+  fi
+  AS_UNSET([am_dirpart])
+  AS_UNSET([am_filepart])
+  AS_UNSET([am_mf])
+  AS_UNSET([am_rc])
+  rm -f conftest-deps.mk
 }
 ])# _AM_OUTPUT_DEPENDENCY_COMMANDS
 
@@ -65,11 +56,10 @@ AC_DEFUN([_AM_OUTPUT_DEPENDENCY_COMMANDS],
 # -----------------------------
 # This macro should only be invoked once -- use via AC_REQUIRE.
 #
-# This code is only required when automatic dependency tracking
-# is enabled.  FIXME.  This creates each '.P' file that we will
-# need in order to bootstrap the dependency handling code.
+# This code is only required when automatic dependency tracking is enabled.
+# This creates each '.Po' and '.Plo' makefile fragment that we'll need in
+# order to bootstrap the dependency handling code.
 AC_DEFUN([AM_OUTPUT_DEPENDENCY_COMMANDS],
 [AC_CONFIG_COMMANDS([depfiles],
      [test x"$AMDEP_TRUE" != x"" || _AM_OUTPUT_DEPENDENCY_COMMANDS],
-     [AMDEP_TRUE="$AMDEP_TRUE" ac_aux_dir="$ac_aux_dir"])
-])
+     [AMDEP_TRUE="$AMDEP_TRUE" MAKE="${MAKE-make}"])])