aclocal.m4

这个是LINUX下的GDB调度工具的源码

AC_DEFUN(CY_AC_PATH_TKH, [
#
# Ok, lets find the tk source trees so we can use the headers
# If the directory (presumably symlink) named "tk" exists, use that one
# in preference to any others.  Same logic is used when choosing library
# and again with Tcl. The search order is the best place to look first, then in
# decreasing significance. The loop breaks if the trigger file is found.
# Note the gross little conversion here of srcdir by cd'ing to the found
# directory. This converts the path from a relative to an absolute, so
# recursive cache variables for the path will work right. We check all
# the possible paths in one loop rather than many seperate loops to speed
# things up.
# the alternative search directory is invoked by --with-tkinclude
#
AC_MSG_CHECKING(for Tk private headers)
AC_ARG_WITH(tkinclude, [  --with-tkinclude        directory where the tk private headers are],
            with_tkinclude=${withval})
no_tk=true
AC_CACHE_VAL(ac_cv_c_tkh,[
# first check to see if --with-tkinclude was specified
if test x"${with_tkinclude}" != x ; then
  if test -f ${with_tkinclude}/tk.h ; then
    ac_cv_c_tkh=`(cd ${with_tkinclude}; pwd)`
  else
    AC_MSG_ERROR([${with_tkinclude} directory doesn't contain private headers])
  fi
fi
# next check in private source directory
#
# since ls returns lowest version numbers first, reverse the entire list
# and search for the worst fit, overwriting it with better fits as we find them
if test x"${ac_cv_c_tkh}" = x ; then
  for i in \
		${srcdir}/../tk \
		`ls -dr ${srcdir}/../tk[[0-9]]* 2>/dev/null` \
		${srcdir}/../../tk \
		`ls -dr ${srcdir}/../../tk[[0-9]]* 2>/dev/null` \
		${srcdir}/../../../tk \
		`ls -dr ${srcdir}/../../../tk[[0-9]]* 2>/dev/null ` ; do
    if test -f $i/tk.h ; then
      ac_cv_c_tkh=`(cd $i; pwd)`
      break
    fi
    # Tk 4.1 and greater puts this in a subdir.
    if test -f $i/generic/tk.h; then
       ac_cv_c_tkh=`(cd $i; pwd)`/generic
    fi
  done
fi
# finally check in a few common install locations
#
# since ls returns lowest version numbers first, reverse the entire list
# and search for the worst fit, overwriting it with better fits as we find them
if test x"${ac_cv_c_tkh}" = x ; then
  for i in \
		`ls -dr /usr/local/src/tk[[0-9]]* 2>/dev/null` \
		`ls -dr /usr/local/lib/tk[[0-9]]* 2>/dev/null` \
		/usr/local/src/tk \
		/usr/local/lib/tk \
		${prefix}/include ; do
    if test -f $i/tk.h ; then
      ac_cv_c_tkh=`(cd $i; pwd)`
      break
    fi
  done
fi
# see if one is installed
if test x"${ac_cv_c_tkh}" = x ; then
  AC_HEADER_CHECK(tk.h, ac_cv_c_tkh=installed)
fi
])
if test x"${ac_cv_c_tkh}" != x ; then
  no_tk=""
  if test x"${ac_cv_c_tkh}" = x"installed" ; then
    AC_MSG_RESULT([is installed])
    TKHDIR=""
  else
    AC_MSG_RESULT([found in $ac_cv_c_tkh])
    # this hack is cause the TKHDIR won't print if there is a "-I" in it.
    TKHDIR="-I${ac_cv_c_tkh}"
  fi
else
  TKHDIR="# no Tk directory found"
  AC_MSG_WARN([Can't find Tk private headers])
  no_tk=true
fi

# if Tk is installed, extract the major/minor version
if test x"${no_tk}" = x ; then
AC_MSG_CHECKING([Tk version])
orig_includes="$CPPFLAGS"

if test x"${TCLHDIR}" != x ; then
  CPPFLAGS="$CPPFLAGS $TCLHDIR"
fi
if test x"${TKHDIR}" != x ; then
  CPPFLAGS="$CPPFLAGS $TKHDIR"
fi
if test x"${x_includes}" != x -a x"${x_includes}" != xNONE ; then
  CPPFLAGS="$CPPFLAGS -I$x_includes"
fi

# Get major and minor versions of Tk.  Use funny names to avoid
# clashes with eg SunOS.
cat > conftest.c <<'EOF'
#include "tk.h"
MaJor = TK_MAJOR_VERSION
MiNor = TK_MINOR_VERSION
EOF

tkmajor=
tkminor=
if (eval "$CPP $CPPFLAGS conftest.c") 2>/dev/null >conftest.out; then
   # Success.
   tkmajor=`egrep '^MaJor = ' conftest.out | sed -e 's/^MaJor = *//' -e 's/ *$//'`
   tkminor=`egrep '^MiNor = ' conftest.out | sed -e 's/^MiNor = *//' -e 's/ *$//'`
fi
rm -f conftest.c conftest.out

if test -z "$tkmajor" || test -z "$tkminor"; then
   AC_MSG_RESULT([fatal error: could not find major or minor version number of Tk])
   exit 1
fi
AC_MSG_RESULT(${tkmajor}.${tkminor})

CPPFLAGS="${orig_includes}"
fi

AC_PROVIDE([$0])
AC_SUBST(TKHDIR)
])
AC_DEFUN(CY_AC_PATH_TKLIB, [
AC_REQUIRE([CY_AC_PATH_TCL])
#
# Ok, lets find the tk library
# First, look for the latest private (uninstalled) copy
# Notice that the destinations in backwards priority since the tests have
# no break.
# Then we look for either .a, .so, or Makefile.  A Makefile is acceptable
# is it indicates the target has been configured and will (probably)
# soon be built.  This allows an entire tree of Tcl software to be
# configured at once and then built.
# the alternative search directory is invoked by --with-tklib
#

if test x"${no_tk}" = x ; then
  # reset no_tk incase something fails here
  no_tk="true"

  if test $tkmajor -ge 4 ; then
    installedtklibroot=tk$tkversion
  else
    installedtkllibroot=tk
  fi

  AC_ARG_WITH(tklib, [  --with-tklib            directory where the tk library is],
              with_tklib=${withval})
  AC_MSG_CHECKING([for Tk library])
  AC_CACHE_VAL(ac_cv_c_tklib,[
  # first check to see if --with-tklib was specified
  # This requires checking for both the installed and uninstalled name-styles
  # since we have no idea if it's installed or not.
  if test x"${with_tklib}" != x ; then
    if test -f "${with_tklib}/lib$installedtklibroot.so" ; then
      ac_cv_c_tklib=`(cd ${with_tklib}; pwd)`/lib$installedtklibroot.so
      no_tk=""
    elif test -f "${with_tklib}/libtk.so" ; then
      ac_cv_c_tklib=`(cd ${with_tklib}; pwd)`/libtk.so
      no_tk=""
    # then look for a freshly built statically linked library
    # if Makefile exists we assume its configured and libtk will be built
    elif test -f "${with_tklib}/lib$installedtklibroot.a" ; then
      ac_cv_c_tklib=`(cd ${with_tklib}; pwd)`/lib$installedtklibroot.a
      no_tk=""
    elif test -f "${with_tklib}/libtk.a" ; then
      ac_cv_c_tklib=`(cd ${with_tklib}; pwd)`/libtk.a
      no_tk=""
    else
      AC_MSG_ERROR([${with_tklib} directory doesn't contain libraries])
    fi
  fi
  # then check for a private Tk library
  # Since these are uninstalled, use the simple lib name root.
  if test x"${ac_cv_c_tklib}" = x ; then
    for i in \
		../tk \
		`ls -dr ../tk[[0-9]]* 2>/dev/null` \
		../../tk \
		`ls -dr ../../tk[[0-9]]* 2>/dev/null` \
		../../../tk \
		`ls -dr ../../../tk[[0-9]]* 2>/dev/null` ; do
      # Tk 4.1 and greater puts things in subdirs.  Check these first.
      if test -f "$i/unix/libtk.so" ; then
	 ac_cv_c_tklib=`(cd $i; pwd)`/unix/libtk.so
	 no_tk=
	 break
      elif test -f "$i/unix/libtk.a" -o -f "$i/unix/Makefile"; then
	 ac_cv_c_tklib=`(cd $i; pwd)`/unix/libtk.a
	 no_tk=
	 break
      # look for a freshly built dynamically linked library
      elif test -f "$i/libtk.so" ; then
        ac_cv_c_tklib=`(cd $i; pwd)`/libtk.so
        no_tk=
	break
      # then look for a freshly built statically linked library
      # if Makefile exists we assume its configured and libtk will be built 
      elif test -f "$i/libtk.a" -o -f "$i/Makefile" ; then
        ac_cv_c_tklib=`(cd $i; pwd)`/libtk.a
        no_tk=""
 	break
      fi
    done
  fi
  # finally check in a few common install locations
  if test x"${ac_cv_c_tklib}" = x ; then
    for i in `ls -d ${prefix}/lib /usr/local/lib 2>/dev/null` ; do
      # first look for a freshly built dynamically linked library
      if test -f "$i/lib$installedtklibroot.so" ; then
        ac_cv_c_tklib=`(cd $i; pwd)`/lib$installedtklibroot.so
        no_tk=""
	break
      # then look for a freshly built statically linked library
      # if Makefile exists, we assume it's configured and libtcl will be built 
      elif test -f "$i/lib$installedtklibroot.a" -o -f "$i/Makefile" ; then
        ac_cv_c_tklib=`(cd $i; pwd)`/lib$installedtklibroot.a
        no_tk=""
 	break
      fi
    done
  fi
  # check in a few other private locations
  if test x"${ac_cv_c_tklib}" = x ; then
    for i in \
		${srcdir}/../tk \
		`ls -dr ${srcdir}/../tk[[0-9]]* 2>/dev/null` ; do
      # Tk 4.1 and greater puts things in subdirs.  Check these first.
      if test -f "$i/unix/libtk.so" ; then
	 ac_cv_c_tklib=`(cd $i; pwd)`/unix/libtk.so
	 no_tk=
	 break
      elif test -f "$i/unix/libtk.a" -o -f "$i/unix/Makefile"; then
	 ac_cv_c_tcllib=`(cd $i; pwd)`/unix/libtk.a
	 no_tk=
	 break
      # look for a freshly built dynamically linked library
      elif test -f "$i/libtk.so" ; then
        ac_cv_c_tklib=`(cd $i; pwd)`/libtk.so
        no_tk=""
	break
      # then look for a freshly built statically linked library
      # if Makefile exists, we assume it's configured and libtcl will be built 
      elif test -f "$i/libtk.a" -o -f "$i/Makefile" ; then
        ac_cv_c_tklib=`(cd $i; pwd)`/libtk.a
        no_tk=""
 	break
      fi
    done
  fi
  # see if one is conveniently installed with the compiler
  if test x"${ac_cv_c_tklib}" = x ; then
       AC_REQUIRE([AC_PATH_X])
       orig_libs="$LIBS"
       LIBS="$LIBS -l$installedtklibroot $x_libraries $ac_cv_c_tcllib -lm"    
       AC_TRY_RUN([
       Tcl_AppInit()
       { exit(0); }], ac_cv_c_tklib="-l$installedtklibroot", ac_cv_c_tklib=""
       , ac_cv_c_tklib="-l$installedtklibroot")
       LIBS="${orig_libs}"
   fi
  ])
  if test x"${ac_cv_c_tklib}" = x ; then
    TKLIB="# no Tk library found"
    AC_MSG_WARN(Can't find Tk library)
  else
    TKLIB=$ac_cv_c_tklib
    AC_MSG_RESULT(found $TKLIB)
    no_tk=
  fi
fi
AC_PROVIDE([$0])
AC_SUBST(TKLIB)
])
AC_DEFUN(CY_AC_PATH_TK, [
  CY_AC_PATH_TKH
  CY_AC_PATH_TKLIB
])
AC_DEFUN(CY_AC_PATH_TCL, [
  CY_AC_PATH_TCLH
  CY_AC_PATH_TCLLIB
])