top level:

	* depcomp: Update from automake CVS.  Add 'ia64hp' stanza.
	In 'cpp' stanza, support '#line' as well as '# '.
config:
	* depstand.m4, lead-dot.m4: New files.
libcpp:
	* configure.ac: Invoke ZW_CREATE_DEPDIR and
	ZW_PROG_COMPILER_DEPENDENCIES.
	* aclocal.m4, configure: Regenerate.
	* Makefile.in (DEPMODE, DEPDIR, depcomp, COMPILE.base, COMPILE):
	New variables.
	(distclean): Clean up $(DEPDIR) and its contents.
	(.c.o): Use $(COMPILE).
	Include $(DEPDIR)/*.Po for most object->header dependencies.


git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@100874 138bc75d-0d04-0410-961f-82ee72b054a4

5 files changed, 285 insertions, 35 deletions

diff --git a/libcpp/ChangeLog b/libcpp/ChangeLog
index f4e8a5e83cc..cc045a0c9c4 100644
--- a/libcpp/ChangeLog
+++ b/libcpp/ChangeLog
@@ -1,3 +1,14 @@
+2005-06-13  Zack Weinberg  <zack@codesourcery.com>
+
+	* configure.ac: Invoke ZW_CREATE_DEPDIR and
+	ZW_PROG_COMPILER_DEPENDENCIES.
+	* aclocal.m4, configure: Regenerate.
+	* Makefile.in (DEPMODE, DEPDIR, depcomp, COMPILE.base, COMPILE):
+	New variables.
+	(distclean): Clean up $(DEPDIR) and its contents.
+	(.c.o): Use $(COMPILE).
+	Include $(DEPDIR)/*.Po for most object->header dependencies.
+
 2005-05-28  Gabriel Dos Reis  <gdr@integrable-solutions.net>
 
 	* configure.ac: Check declarations for asprintf and vasprintf.
@@ -17,7 +28,7 @@
 	* directives.c (glue_header_name): Use XNEWVEC and XRESIZEVEC.
 	(parse_include): Use XNEWVEC.
 	(insert_pragma_entry): Rename local variable "new" to
-	"new_entry". 
+	"new_entry".
 	(save_registered_pragmas): Cast return value of xmemdup.
 	(destringize_and_run): Same for alloca.
 	(parse_assertion): Likewise.
diff --git a/libcpp/Makefile.in b/libcpp/Makefile.in
index 8a7a4898365..d236c1bd999 100644
--- a/libcpp/Makefile.in
+++ b/libcpp/Makefile.in
@@ -51,6 +51,8 @@ RANLIB = @RANLIB@
 SHELL = @SHELL@
 USED_CATALOGS = @USED_CATALOGS@
 XGETTEXT = @XGETTEXT@
+DEPMODE = @CCDEPMODE@
+DEPDIR = @DEPDIR@
 
 datadir = @datadir@
 exec_prefix = @prefix@
@@ -60,6 +62,8 @@ prefix = @prefix@
 
 MSGMERGE = msgmerge
 mkinstalldirs = $(SHELL) $(srcdir)/../mkinstalldirs
+depcomp = $(SHELL) $(srcdir)/../depcomp
+
 INCLUDES = -I$(srcdir) -I. -I$(srcdir)/../include @INCINTL@ \
 	-I$(srcdir)/include
 
@@ -165,7 +169,8 @@ clean: mostlyclean
 distclean: clean
 	-rm -f config.h stamp-h1 config.status config.cache config.log \
 	  configure.lineno configure.status.lineno Makefile localedir.h \
-	  localedir.hs
+	  localedir.hs $(DEPDIR)/*.Po
+	-rmdir $(DEPDIR)
 
 maintainer-clean: distclean
 	@echo "This command is intended for maintainers to use"
@@ -186,10 +191,19 @@ update-po: $(CATALOGS:.gmo=.pox)
   maintainer-clean check installcheck dvi html info install-info \
   install-man update-po
 
+# Dependency rule.
+COMPILE.base = $(CC) $(DEFS) $(INCLUDES) $(CPPFLAGS) $(ALL_CFLAGS) -c
+ifeq ($(DEPMODE),depmode=gcc3)
+COMPILE = $(COMPILE.base) -o $@ -MT $@ -MD -MP -MF $(DEPDIR)/$*.Po
+else
+COMPILE = source='$<' object='$@' libtool=no DEPDIR=$(DEPDIR) $(DEPMODE) \
+	  $(depcomp) $(COMPILE.base)
+endif
+
 # Implicit rules and I18N
 
 .c.o:
-	$(CC) $(DEFS) $(INCLUDES) $(CPPFLAGS) $(ALL_CFLAGS) -c $<
+	$(COMPILE) $<
 
 # N.B. We do not attempt to copy these into $(srcdir).
 .po.gmo:
@@ -227,35 +241,7 @@ po/$(PACKAGE).pot: $(libcpp_a_SOURCES)
 .NOEXPORT:
 
 # Dependencies
+-include $(patsubst %.o, $(DEPDIR)/%.Po, $(libcpp_a_OBJS) $(makedepend_OBJS))
 
-top_srcdir = $(srcdir)/..
-top_incdir = $(srcdir)/../include
-libcpp_incdir = $(srcdir)/../libcpp/include
-
-COMMON_DEPS = config.h $(srcdir)/system.h $(srcdir)/internal.h \
-  $(top_incdir)/libiberty.h $(top_incdir)/ansidecl.h \
-  $(top_incdir)/filenames.h $(top_incdir)/safe-ctype.h \
-  $(libcpp_incdir)/symtab.h $(top_incdir)/obstack.h \
-  $(libcpp_incdir)/line-map.h $(libcpp_incdir)/cpplib.h \
-  $(libcpp_incdir)/cpp-id-data.h $(top_incdir)/getopt.h 
-
-charset.o: $(srcdir)/charset.c $(COMMON_DEPS) $(srcdir)/ucnid.h
-directives.o: $(srcdir)/directives.c $(COMMON_DEPS) $(libcpp_incdir)/mkdeps.h
-errors.o: $(srcdir)/errors.c $(COMMON_DEPS)
-expr.o: $(srcdir)/expr.c $(COMMON_DEPS)
-
-files.o: $(srcdir)/files.c $(COMMON_DEPS) $(libcpp_incdir)/mkdeps.h \
-   $(top_incdir)/hashtab.h $(top_incdir)/md5.h
-identifiers.o: $(srcdir)/identifiers.c $(COMMON_DEPS)
-init.o: $(srcdir)/init.c $(COMMON_DEPS) $(libcpp_incdir)/mkdeps.h localedir.h
-lex.o: $(srcdir)/lex.c $(COMMON_DEPS)
-line-map.o: $(srcdir)/line-map.c $(COMMON_DEPS)
-macro.o: $(srcdir)/macro.c $(COMMON_DEPS)
-makedepend.o: $(srcdir)/makedepend.c $(COMMON_DEPS) $(libcpp_incdir)/mkdeps.h
-mkdeps.o: $(srcdir)/mkdeps.c $(COMMON_DEPS)
-
-pch.o: $(srcdir)/pch.c $(COMMON_DEPS) \
-   $(top_incdir)/hashtab.h $(libcpp_incdir)/mkdeps.h
-
-symtab.o: $(srcdir)/symtab.c $(COMMON_DEPS)
-traditional.o: $(srcdir)/traditional.c $(COMMON_DEPS)
+# Dependencies on generated headers have to be explicit.
+init.o: localedir.h
diff --git a/libcpp/aclocal.m4 b/libcpp/aclocal.m4
index 97c314ada6e..ad1d0ce7bac 100644
--- a/libcpp/aclocal.m4
+++ b/libcpp/aclocal.m4
@@ -13,8 +13,10 @@
 
 m4_include([../config/acx.m4])
 m4_include([../config/codeset.m4])
+m4_include([../config/depstand.m4])
 m4_include([../config/gettext-sister.m4])
 m4_include([../config/iconv.m4])
+m4_include([../config/lead-dot.m4])
 m4_include([../config/lib-ld.m4])
 m4_include([../config/lib-link.m4])
 m4_include([../config/lib-prefix.m4])
diff --git a/libcpp/configure b/libcpp/configure
index d0c04d959a1..63e2020d3d7 100755
--- a/libcpp/configure
+++ b/libcpp/configure
@@ -311,7 +311,7 @@ ac_includes_default="\
 # include <unistd.h>
 #endif"
 
-ac_subst_vars='SHELL PATH_SEPARATOR PACKAGE_NAME PACKAGE_TARNAME PACKAGE_VERSION PACKAGE_STRING PACKAGE_BUGREPORT exec_prefix prefix program_transform_name bindir sbindir libexecdir datadir sysconfdir sharedstatedir localstatedir libdir includedir oldincludedir infodir mandir build_alias host_alias target_alias DEFS ECHO_C ECHO_N ECHO_T LIBS build build_cpu build_vendor build_os host host_cpu host_vendor host_os target target_cpu target_vendor target_os SET_MAKE INSTALL_PROGRAM INSTALL_SCRIPT INSTALL_DATA CC CFLAGS LDFLAGS CPPFLAGS ac_ct_CC EXEEXT OBJEXT RANLIB ac_ct_RANLIB ACLOCAL AUTOCONF AUTOHEADER WARN_CFLAGS WARN_PEDANTIC WERROR CPP EGREP LIBOBJS ALLOCA USE_NLS LIBINTL LIBINTL_DEP INCINTL XGETTEXT GMSGFMT POSUB CATALOGS LIBICONV LTLIBICONV PACKAGE USED_CATALOGS MAINT LTLIBOBJS'
+ac_subst_vars='SHELL PATH_SEPARATOR PACKAGE_NAME PACKAGE_TARNAME PACKAGE_VERSION PACKAGE_STRING PACKAGE_BUGREPORT exec_prefix prefix program_transform_name bindir sbindir libexecdir datadir sysconfdir sharedstatedir localstatedir libdir includedir oldincludedir infodir mandir build_alias host_alias target_alias DEFS ECHO_C ECHO_N ECHO_T LIBS build build_cpu build_vendor build_os host host_cpu host_vendor host_os target target_cpu target_vendor target_os SET_MAKE INSTALL_PROGRAM INSTALL_SCRIPT INSTALL_DATA CC CFLAGS LDFLAGS CPPFLAGS ac_ct_CC EXEEXT OBJEXT RANLIB ac_ct_RANLIB ACLOCAL AUTOCONF AUTOHEADER WARN_CFLAGS WARN_PEDANTIC WERROR am__leading_dot DEPDIR CCDEPMODE CPP EGREP LIBOBJS ALLOCA USE_NLS LIBINTL LIBINTL_DEP INCINTL XGETTEXT GMSGFMT POSUB CATALOGS LIBICONV LTLIBICONV PACKAGE USED_CATALOGS MAINT LTLIBOBJS'
 ac_subst_files=''
 
 # Initialize some variables set by options.
@@ -2839,6 +2839,120 @@ fi
 
 
 
+# Dependency checking.
+rm -rf .tst 2>/dev/null
+mkdir .tst 2>/dev/null
+if test -d .tst; then
+  am__leading_dot=.
+else
+  am__leading_dot=_
+fi
+rmdir .tst 2>/dev/null
+
+DEPDIR="${am__leading_dot}deps"
+
+          ac_config_commands="$ac_config_commands depdir"
+
+
+depcc="$CC"   am_compiler_list=
+
+am_depcomp=$ac_aux_dir/depcomp
+echo "$as_me:$LINENO: checking dependency style of $depcc" >&5
+echo $ECHO_N "checking dependency style of $depcc... $ECHO_C" >&6
+if test "${am_cv_CC_dependencies_compiler_type+set}" = set; then
+  echo $ECHO_N "(cached) $ECHO_C" >&6
+else
+  if test -f "$am_depcomp"; then
+  # We make a subdir and do the tests there.  Otherwise we can end up
+  # making bogus files that we don't know about and never remove.  For
+  # instance it was reported that on HP-UX the gcc test will end up
+  # making a dummy file named `D' -- because `-MD' means `put the output
+  # in D'.
+  mkdir conftest.dir
+  # Copy depcomp to subdir because otherwise we won't find it if we're
+  # using a relative directory.
+  cp "$am_depcomp" conftest.dir
+  cd conftest.dir
+  # We will build objects and dependencies in a subdirectory because
+  # it helps to detect inapplicable dependency modes.  For instance
+  # both Tru64's cc and ICC support -MD to output dependencies as a
+  # side effect of compilation, but ICC will put the dependencies in
+  # the current directory while Tru64 will put them in the object
+  # directory.
+  mkdir sub
+
+  am_cv_CC_dependencies_compiler_type=none
+  if test "$am_compiler_list" = ""; then
+     am_compiler_list=`sed -n 's/^\([a-zA-Z0-9]*\))$/\1/p' < ./depcomp`
+  fi
+  for depmode in $am_compiler_list; do
+    if test $depmode = none; then break; fi
+
+    echo "$as_me:$LINENO: trying $depmode" >&5
+    # Setup a source with many dependencies, because some compilers
+    # like to wrap large dependency lists on column 80 (with \), and
+    # we should not choose a depcomp mode which is confused by this.
+    #
+    # We need to recreate these files for each test, as the compiler may
+    # overwrite some of them when testing with obscure command lines.
+    # This happens at least with the AIX C compiler.
+    : > sub/conftest.c
+    for i in 1 2 3 4 5 6; do
+      echo '#include "conftst'$i'.h"' >> sub/conftest.c
+      # Using `: > sub/conftst$i.h' creates only sub/conftst1.h with
+      # Solaris 8's {/usr,}/bin/sh.
+      touch sub/conftst$i.h
+    done
+    echo "include sub/conftest.Po" > confmf
+
+    # We check with `-c' and `-o' for the sake of the "dashmstdout"
+    # mode.  It turns out that the SunPro C++ compiler does not properly
+    # handle `-M -o', and we need to detect this.
+    depcmd="depmode=$depmode \
+       source=sub/conftest.c object=sub/conftest.${OBJEXT-o} \
+       depfile=sub/conftest.Po tmpdepfile=sub/conftest.TPo \
+       $SHELL ./depcomp $depcc -c -o sub/conftest.${OBJEXT-o} sub/conftest.c"
+    echo "| $depcmd" | sed -e 's/  */ /g' >&5
+    if env $depcmd > conftest.err 2>&1 &&
+       grep sub/conftst6.h sub/conftest.Po >>conftest.err 2>&1 &&
+       grep sub/conftest.${OBJEXT-o} sub/conftest.Po >>conftest.err 2>&1 &&
+       ${MAKE-make} -s -f confmf >>conftest.err 2>&1; then
+      # icc doesn't choke on unknown options, it will just issue warnings
+      # or remarks (even with -Werror).  So we grep stderr for any message
+      # that says an option was ignored or not supported.
+      # When given -MP, icc 7.0 and 7.1 complain thusly:
+      #   icc: Command line warning: ignoring option '-M'; no argument required
+      # The diagnosis changed in icc 8.0:
+      #   icc: Command line remark: option '-MP' not supported
+      if (grep 'ignoring option' conftest.err ||
+          grep 'not supported' conftest.err) >/dev/null 2>&1; then :; else
+        am_cv_CC_dependencies_compiler_type=$depmode
+	echo "$as_me:$LINENO: success" >&5
+        break
+      fi
+    fi
+    echo "$as_me:$LINENO: failure, diagnostics are:" >&5
+    sed -e 's/^/| /' < conftest.err >&5
+  done
+
+  cd ..
+  rm -rf conftest.dir
+else
+  am_cv_CC_dependencies_compiler_type=none
+fi
+
+fi
+echo "$as_me:$LINENO: result: $am_cv_CC_dependencies_compiler_type" >&5
+echo "${ECHO_T}$am_cv_CC_dependencies_compiler_type" >&6
+if test x${am_cv_CC_dependencies_compiler_type-none} = xnone
+then { { echo "$as_me:$LINENO: error: no usable dependency style found" >&5
+echo "$as_me: error: no usable dependency style found" >&2;}
+   { (exit 1); exit 1; }; }
+else CCDEPMODE=depmode=$am_cv_CC_dependencies_compiler_type
+
+fi
+
+
 # Checks for header files.
 echo "$as_me:$LINENO: checking whether time.h and sys/time.h may both be included" >&5
 echo $ECHO_N "checking whether time.h and sys/time.h may both be included... $ECHO_C" >&6
@@ -8558,6 +8672,9 @@ $config_files
 Configuration headers:
 $config_headers
 
+Configuration commands:
+$config_commands
+
 Report bugs to <bug-autoconf@gnu.org>."
 _ACEOF
 
@@ -8657,7 +8774,14 @@ fi
 
 _ACEOF
 
+cat >>$CONFIG_STATUS <<_ACEOF
+#
+# INIT-COMMANDS section.
+#
+
+DEPDIR=$DEPDIR
 
+_ACEOF
 
 
 
@@ -8667,6 +8791,7 @@ do
   case "$ac_config_target" in
   # Handling of arguments.
   "Makefile" ) CONFIG_FILES="$CONFIG_FILES Makefile" ;;
+  "depdir" ) CONFIG_COMMANDS="$CONFIG_COMMANDS depdir" ;;
   "config.h" ) CONFIG_HEADERS="$CONFIG_HEADERS config.h:config.in" ;;
   *) { { echo "$as_me:$LINENO: error: invalid argument: $ac_config_target" >&5
 echo "$as_me: error: invalid argument: $ac_config_target" >&2;}
@@ -8681,6 +8806,7 @@ done
 if $ac_need_defaults; then
   test "${CONFIG_FILES+set}" = set || CONFIG_FILES=$config_files
   test "${CONFIG_HEADERS+set}" = set || CONFIG_HEADERS=$config_headers
+  test "${CONFIG_COMMANDS+set}" = set || CONFIG_COMMANDS=$config_commands
 fi
 
 # Have a temporary directory for convenience.  Make it in the build tree
@@ -8783,6 +8909,9 @@ s,@AUTOHEADER@,$AUTOHEADER,;t t
 s,@WARN_CFLAGS@,$WARN_CFLAGS,;t t
 s,@WARN_PEDANTIC@,$WARN_PEDANTIC,;t t
 s,@WERROR@,$WERROR,;t t
+s,@am__leading_dot@,$am__leading_dot,;t t
+s,@DEPDIR@,$DEPDIR,;t t
+s,@CCDEPMODE@,$CCDEPMODE,;t t
 s,@CPP@,$CPP,;t t
 s,@EGREP@,$EGREP,;t t
 s,@LIBOBJS@,$LIBOBJS,;t t
@@ -9266,6 +9395,124 @@ echo "$as_me: error: cannot create directory \"$ac_dir\"" >&2;}
   esac
 done
 _ACEOF
+cat >>$CONFIG_STATUS <<\_ACEOF
+
+#
+# CONFIG_COMMANDS section.
+#
+for ac_file in : $CONFIG_COMMANDS; do test "x$ac_file" = x: && continue
+  ac_dest=`echo "$ac_file" | sed 's,:.*,,'`
+  ac_source=`echo "$ac_file" | sed 's,[^:]*:,,'`
+  ac_dir=`(dirname "$ac_dest") 2>/dev/null ||
+$as_expr X"$ac_dest" : 'X\(.*[^/]\)//*[^/][^/]*/*$' \| \
+	 X"$ac_dest" : 'X\(//\)[^/]' \| \
+	 X"$ac_dest" : 'X\(//\)$' \| \
+	 X"$ac_dest" : 'X\(/\)' \| \
+	 .     : '\(.\)' 2>/dev/null ||
+echo X"$ac_dest" |
+    sed '/^X\(.*[^/]\)\/\/*[^/][^/]*\/*$/{ s//\1/; q; }
+  	  /^X\(\/\/\)[^/].*/{ s//\1/; q; }
+  	  /^X\(\/\/\)$/{ s//\1/; q; }
+  	  /^X\(\/\).*/{ s//\1/; q; }
+  	  s/.*/./; q'`
+  { if $as_mkdir_p; then
+    mkdir -p "$ac_dir"
+  else
+    as_dir="$ac_dir"
+    as_dirs=
+    while test ! -d "$as_dir"; do
+      as_dirs="$as_dir $as_dirs"
+      as_dir=`(dirname "$as_dir") 2>/dev/null ||
+$as_expr X"$as_dir" : 'X\(.*[^/]\)//*[^/][^/]*/*$' \| \
+	 X"$as_dir" : 'X\(//\)[^/]' \| \
+	 X"$as_dir" : 'X\(//\)$' \| \
+	 X"$as_dir" : 'X\(/\)' \| \
+	 .     : '\(.\)' 2>/dev/null ||
+echo X"$as_dir" |
+    sed '/^X\(.*[^/]\)\/\/*[^/][^/]*\/*$/{ s//\1/; q; }
+  	  /^X\(\/\/\)[^/].*/{ s//\1/; q; }
+  	  /^X\(\/\/\)$/{ s//\1/; q; }
+  	  /^X\(\/\).*/{ s//\1/; q; }
+  	  s/.*/./; q'`
+    done
+    test ! -n "$as_dirs" || mkdir $as_dirs
+  fi || { { echo "$as_me:$LINENO: error: cannot create directory \"$ac_dir\"" >&5
+echo "$as_me: error: cannot create directory \"$ac_dir\"" >&2;}
+   { (exit 1); exit 1; }; }; }
+
+  ac_builddir=.
+
+if test "$ac_dir" != .; then
+  ac_dir_suffix=/`echo "$ac_dir" | sed 's,^\.[\\/],,'`
+  # A "../" for each directory in $ac_dir_suffix.
+  ac_top_builddir=`echo "$ac_dir_suffix" | sed 's,/[^\\/]*,../,g'`
+else
+  ac_dir_suffix= ac_top_builddir=
+fi
+
+case $srcdir in
+  .)  # No --srcdir option.  We are building in place.
+    ac_srcdir=.
+    if test -z "$ac_top_builddir"; then
+       ac_top_srcdir=.
+    else
+       ac_top_srcdir=`echo $ac_top_builddir | sed 's,/$,,'`
+    fi ;;
+  [\\/]* | ?:[\\/]* )  # Absolute path.
+    ac_srcdir=$srcdir$ac_dir_suffix;
+    ac_top_srcdir=$srcdir ;;
+  *) # Relative path.
+    ac_srcdir=$ac_top_builddir$srcdir$ac_dir_suffix
+    ac_top_srcdir=$ac_top_builddir$srcdir ;;
+esac
+
+# Do not use `cd foo && pwd` to compute absolute paths, because
+# the directories may not exist.
+case `pwd` in
+.) ac_abs_builddir="$ac_dir";;
+*)
+  case "$ac_dir" in
+  .) ac_abs_builddir=`pwd`;;
+  [\\/]* | ?:[\\/]* ) ac_abs_builddir="$ac_dir";;
+  *) ac_abs_builddir=`pwd`/"$ac_dir";;
+  esac;;
+esac
+case $ac_abs_builddir in
+.) ac_abs_top_builddir=${ac_top_builddir}.;;
+*)
+  case ${ac_top_builddir}. in
+  .) ac_abs_top_builddir=$ac_abs_builddir;;
+  [\\/]* | ?:[\\/]* ) ac_abs_top_builddir=${ac_top_builddir}.;;
+  *) ac_abs_top_builddir=$ac_abs_builddir/${ac_top_builddir}.;;
+  esac;;
+esac
+case $ac_abs_builddir in
+.) ac_abs_srcdir=$ac_srcdir;;
+*)
+  case $ac_srcdir in
+  .) ac_abs_srcdir=$ac_abs_builddir;;
+  [\\/]* | ?:[\\/]* ) ac_abs_srcdir=$ac_srcdir;;
+  *) ac_abs_srcdir=$ac_abs_builddir/$ac_srcdir;;
+  esac;;
+esac
+case $ac_abs_builddir in
+.) ac_abs_top_srcdir=$ac_top_srcdir;;
+*)
+  case $ac_top_srcdir in
+  .) ac_abs_top_srcdir=$ac_abs_builddir;;
+  [\\/]* | ?:[\\/]* ) ac_abs_top_srcdir=$ac_top_srcdir;;
+  *) ac_abs_top_srcdir=$ac_abs_builddir/$ac_top_srcdir;;
+  esac;;
+esac
+
+
+  { echo "$as_me:$LINENO: executing $ac_dest commands" >&5
+echo "$as_me: executing $ac_dest commands" >&6;}
+  case $ac_dest in
+    depdir ) mkdir $DEPDIR ;;
+  esac
+done
+_ACEOF
 
 cat >>$CONFIG_STATUS <<\_ACEOF
 
diff --git a/libcpp/configure.ac b/libcpp/configure.ac
index fe52964aae9..5c27835e871 100644
--- a/libcpp/configure.ac
+++ b/libcpp/configure.ac
@@ -29,6 +29,10 @@ ACX_PROG_CC_WARNING_ALMOST_PEDANTIC([-Wno-long-long])
 # corrected.
 ACX_PROG_CC_WARNINGS_ARE_ERRORS([manual])
 
+# Dependency checking.
+ZW_CREATE_DEPDIR
+ZW_PROG_COMPILER_DEPENDENCIES([CC])
+
 # Checks for header files.
 AC_HEADER_TIME
 ACX_HEADER_STRING