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##                                                          -*- Autoconf -*-

# Copyright (C) 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2007

# Free Software Foundation, Inc.

#

# This file is free software; the Free Software Foundation

# gives unlimited permission to copy and/or distribute it,

# with or without modifications, as long as this notice is preserved.

# serial 8

# Based on depend.m4 from automake 1.9, modified for standalone use in

# an environment where GNU make is required.

# ZW_PROG_COMPILER_DEPENDENCIES

# -----------------------------

# Variant of _AM_DEPENDENCIES which just does the dependency probe and

# sets fooDEPMODE accordingly.  Cache-variable compatible with

# original; not side-effect compatible.  As the users of this macro

# may require accurate dependencies for correct builds, it does *not*

# honor --disable-dependency-checking, and failure to detect a usable

# method is an error.  depcomp is assumed to be located in

# $ac_aux_dir.

#

# FIXME: Should use the Autoconf 2.5x language-selection mechanism.

AC_DEFUN([ZW_PROG_COMPILER_DEPENDENCIES],

[ifelse([$1], CC,   [depcc="$CC"   am_compiler_list=],

        [$1], CXX,  [depcc="$CXX"  am_compiler_list=],

        [$1], OBJC, [depcc="$OBJC" am_compiler_list='gcc3 gcc'],

        [$1], GCJ,  [depcc="$GCJ"  am_compiler_list='gcc3 gcc'],

                    [depcc="$$1"   am_compiler_list=])

am_depcomp=$ac_aux_dir/depcomp

AC_CACHE_CHECK([dependency style of $depcc],

               [am_cv_$1_dependencies_compiler_type],

[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_$1_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

    _AS_ECHO([$as_me:$LINENO: trying $depmode], AS_MESSAGE_LOG_FD)

    # 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' >&AS_MESSAGE_LOG_FD

    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_$1_dependencies_compiler_type=$depmode

        _AS_ECHO([$as_me:$LINENO: success], AS_MESSAGE_LOG_FD)

        break

      fi

    fi

    _AS_ECHO([$as_me:$LINENO: failure, diagnostics are:], AS_MESSAGE_LOG_FD)

    sed -e 's/^/| /' < conftest.err >&AS_MESSAGE_LOG_FD

  done

  cd ..

  rm -rf conftest.dir

else

  am_cv_$1_dependencies_compiler_type=none

fi

])

if test x${am_cv_$1_dependencies_compiler_type-none} = xnone

then AC_MSG_ERROR([no usable dependency style found])

else AC_SUBST([$1DEPMODE], [depmode=$am_cv_$1_dependencies_compiler_type])

fi

])

# AM_SET_DEPDIR

# -------------

# Choose a directory name for dependency files.

AC_DEFUN([AM_SET_DEPDIR],

[AC_REQUIRE([AM_SET_LEADING_DOT])dnl

AC_SUBST([DEPDIR], ["${am__leading_dot}deps"])dnl

])

# ZW_CREATE_DEPDIR

# ----------------

# As AM_SET_DEPDIR, but also create the directory at config.status time.

AC_DEFUN([ZW_CREATE_DEPDIR],

[AC_REQUIRE([AM_SET_DEPDIR])dnl

AC_CONFIG_COMMANDS([depdir], [$SHELL $ac_aux_dir/mkinstalldirs $DEPDIR],

                             [ac_aux_dir=$ac_aux_dir DEPDIR=$DEPDIR])

])