aclocal.m4

这个是LINUX下的GDB调度工具的源码

dnl This file is duplicated in four places:
dnl * gdb/aclocal.m4
dnl * gdb/testsuite/aclocal.m4
dnl * expect/aclocal.m4
dnl * dejagnu/aclocal.m4
dnl Consider modifying all copies in parallel.
dnl written by Rob Savoye <[e-mail]> for Cygnus Support
dnl CYGNUS LOCAL: This gets the right posix flag for gcc
AC_DEFUN(CY_AC_TCL_LYNX_POSIX,
[AC_REQUIRE([AC_PROG_CC])AC_REQUIRE([AC_PROG_CPP])
AC_MSG_CHECKING([to see if this is LynxOS])
AC_CACHE_VAL(ac_cv_os_lynx,
[AC_EGREP_CPP(yes,
[/*
 * The old Lynx "cc" only defines "Lynx", but the newer one uses "__Lynx__"
 */
#if defined(__Lynx__) || defined(Lynx)
yes
#endif
], ac_cv_os_lynx=yes, ac_cv_os_lynx=no)])
#
if test "$ac_cv_os_lynx" = "yes" ; then
  AC_MSG_RESULT(yes)
  AC_DEFINE(LYNX)
  AC_MSG_CHECKING([whether -mposix or -X is available])
  AC_CACHE_VAL(ac_cv_c_posix_flag,
  [AC_TRY_COMPILE(,[
  /*
   * This flag varies depending on how old the compiler is.
   * -X is for the old "cc" and "gcc" (based on 1.42).
   * -mposix is for the new gcc (at least 2.5.8).
   */
  #if defined(__GNUC__) && __GNUC__ >= 2
  choke me
  #endif
  ], ac_cv_c_posix_flag=" -mposix", ac_cv_c_posix_flag=" -X")])
  CC="$CC $ac_cv_c_posix_flag"
  AC_MSG_RESULT($ac_cv_c_posix_flag)
  else
  AC_MSG_RESULT(no)
fi
])

AC_DEFUN(CY_AC_PATH_TCLH, [
#
# Ok, lets find the tcl source trees so we can use the headers
# Warning: transition of version 9 to 10 will break this algorithm
# because 10 sorts before 9. We also look for just tcl. We have to
# be careful that we don't match stuff like tclX by accident.
# the alternative search directory is involked by --with-tclinclude
#
no_tcl=true
AC_MSG_CHECKING(for Tcl private headers)
AC_ARG_WITH(tclinclude, [  --with-tclinclude       directory where tcl private headers are], with_tclinclude=${withval})
AC_CACHE_VAL(ac_cv_c_tclh,[
# first check to see if --with-tclinclude was specified
if test x"${with_tclinclude}" != x ; then
  if test -f ${with_tclinclude}/tclInt.h ; then
    ac_cv_c_tclh=`(cd ${with_tclinclude}; pwd)`
  else
    AC_MSG_ERROR([${with_tclinclude} directory doesn't contain private headers])
  fi
fi
# next check in private source directory
#
# since ls returns lowest version numbers first, reverse its output
if test x"${ac_cv_c_tclh}" = x ; then
  for i in \
		${srcdir}/../tcl \
		`ls -dr ${srcdir}/../tcl[[0-9]]* 2>/dev/null` \
		${srcdir}/../../tcl \
		`ls -dr ${srcdir}/../../tcl[[0-9]]* 2>/dev/null` \
		${srcdir}/../../../tcl \
		`ls -dr ${srcdir}/../../../tcl[[0-9]]* 2>/dev/null ` ; do
    if test -f $i/tclInt.h ; then
      ac_cv_c_tclh=`(cd $i; pwd)`
      break
    fi
    # Tcl 7.5 and greater puts headers in subdirectory.
    if test -f $i/generic/tclInt.h ; then
      ac_cv_c_tclh=`(cd $i; pwd)`/generic
      break
    fi
  done
fi
# finally check in a few common install locations
#
# since ls returns lowest version numbers first, reverse its output
if test x"${ac_cv_c_tclh}" = x ; then
  for i in \
		`ls -dr /usr/local/src/tcl[[0-9]]* 2>/dev/null` \
		`ls -dr /usr/local/lib/tcl[[0-9]]* 2>/dev/null` \
		/usr/local/src/tcl \
		/usr/local/lib/tcl \
		${prefix}/include ; do
    if test -f $i/tclInt.h ; then
      ac_cv_c_tclh=`(cd $i; pwd)`
      break
    fi
  done
fi
# see if one is installed
if test x"${ac_cv_c_tclh}" = x ; then
   AC_HEADER_CHECK(tclInt.h, ac_cv_c_tclh=installed, ac_cv_c_tclh="")
fi
])
if test x"${ac_cv_c_tclh}" = x ; then
  TCLHDIR="# no Tcl private headers found"
  AC_MSG_ERROR([Can't find Tcl private headers])
fi
if test x"${ac_cv_c_tclh}" != x ; then
  no_tcl=""
  if test x"${ac_cv_c_tclh}" = x"installed" ; then
    AC_MSG_RESULT([is installed])
    TCLHDIR=""
  else
    AC_MSG_RESULT([found in ${ac_cv_c_tclh}])
    # this hack is cause the TCLHDIR won't print if there is a "-I" in it.
    TCLHDIR="-I${ac_cv_c_tclh}"
  fi
fi

AC_MSG_CHECKING([Tcl version])
orig_includes="$CPPFLAGS"

if test x"${TCLHDIR}" != x ; then
  CPPFLAGS="$CPPFLAGS $TCLHDIR"
fi

# Get major and minor versions of Tcl.  Use funny names to avoid
# clashes with eg SunOS.
cat > conftest.c <<'EOF'
#include "tcl.h"
MaJor = TCL_MAJOR_VERSION
MiNor = TCL_MINOR_VERSION
EOF

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

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

CPPFLAGS="${orig_includes}"

AC_PROVIDE([$0])
AC_SUBST(TCLHDIR)
])
AC_DEFUN(CY_AC_PATH_TCLLIB, [
#
# Ok, lets find the tcl library
# First, look for one uninstalled.  
# the alternative search directory is invoked by --with-tcllib
#

if test $tclmajor -ge 7 -a $tclminor -ge 4 ; then
  installedtcllibroot=tcl$tclversion
else
  installedtcllibroot=tcl
fi

if test x"${no_tcl}" = x ; then
  # we reset no_tcl incase something fails here
  no_tcl=true
  AC_ARG_WITH(tcllib, [  --with-tcllib           directory where the tcl library is],
         with_tcllib=${withval})
  AC_MSG_CHECKING([for Tcl library])
  AC_CACHE_VAL(ac_cv_c_tcllib,[
  # First check to see if --with-tcllib 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"${with_tcllib}" != x ; then
    if test -f "${with_tcllib}/lib$installedtcllibroot.so" ; then
      ac_cv_c_tcllib=`(cd ${with_tcllib}; pwd)`/lib$installedtcllibroot.so
    elif test -f "${with_tcllib}/libtcl.so" ; then
      ac_cv_c_tcllib=`(cd ${with_tcllib}; pwd)`/libtcl.so
    # then look for a freshly built statically linked library
    # if Makefile exists we assume its configured and libtcl will be built first.
    elif test -f "${with_tcllib}/lib$installedtcllibroot.a" ; then
      ac_cv_c_tcllib=`(cd ${with_tcllib}; pwd)`/lib$installedtcllibroot.a
    elif test -f "${with_tcllib}/libtcl.a" ; then
      ac_cv_c_tcllib=`(cd ${with_tcllib}; pwd)`/libtcl.a
    else
      AC_MSG_ERROR([${with_tcllib} directory doesn't contain libraries])
    fi
  fi
  # then check for a private Tcl library
  # Since these are uninstalled, use the simple lib name root.
  if test x"${ac_cv_c_tcllib}" = x ; then
    for i in \
		../tcl \
		`ls -dr ../tcl[[0-9]]* 2>/dev/null` \
		../../tcl \
		`ls -dr ../../tcl[[0-9]]* 2>/dev/null` \
		../../../tcl \
		`ls -dr ../../../tcl[[0-9]]* 2>/dev/null` ; do
      # Tcl 7.5 and greater puts library in subdir.  Look there first.
      if test -f "$i/unix/libtcl.so" ; then
	 ac_cv_c_tcllib=`(cd $i; pwd)`/unix/libtcl.so
	 break
      elif test -f "$i/unix/libtcl.a" -o -f "$i/unix/Makefile"; then
	 ac_cv_c_tcllib=`(cd $i; pwd)`/unix/libtcl.a
	 break
      # look for a freshly built dynamically linked library
      elif test -f "$i/libtcl.so" ; then
        ac_cv_c_tcllib=`(cd $i; pwd)`/libtcl.so
	break

      # then look for a freshly built statically linked library
      # if Makefile exists we assume its configured and libtcl will be
      # built first.
      elif test -f "$i/libtcl.a" -o -f "$i/Makefile" ; then
        ac_cv_c_tcllib=`(cd $i; pwd)`/libtcl.a
	break
      fi
    done
  fi
  # check in a few common install locations
  if test x"${ac_cv_c_tcllib}" = 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$installedtcllibroot.so" ; then
        ac_cv_c_tcllib=`(cd $i; pwd)`/lib$installedtcllibroot.so
	break
      # then look for a freshly built statically linked library
      # if Makefile exists we assume its configured and libtcl will be built first.
      elif test -f "$i/lib$installedtcllibroot.a" -o -f "$i/Makefile" ; then
        ac_cv_c_tcllib=`(cd $i; pwd)`/lib$installedtcllibroot.a
	break
      fi
    done
  fi
  # check in a few other private locations
  if test x"${ac_cv_c_tcllib}" = x ; then
    for i in \
		${srcdir}/../tcl \
		`ls -dr ${srcdir}/../tcl[[0-9]]* 2>/dev/null` ; do
      # Tcl 7.5 and greater puts library in subdir.  Look there first.
      if test -f "$i/unix/libtcl.so" ; then
	 ac_cv_c_tcllib=`(cd $i; pwd)`/unix/libtcl.so
	 break
      elif test -f "$i/unix/libtcl.a" -o -f "$i/unix/Makefile"; then
	 ac_cv_c_tcllib=`(cd $i; pwd)`/unix/libtcl.a
	 break
      # look for a freshly built dynamically linked library
      elif test -f "$i/libtcl.so" ; then
        ac_cv_c_tcllib=`(cd $i; pwd)`/libtcl.so
	break

      # then look for a freshly built statically linked library
      # if Makefile exists we assume its configured and libtcl will be
      # built first.
      elif test -f "$i/libtcl.a" -o -f "$i/Makefile" ; then
        ac_cv_c_tcllib=`(cd $i; pwd)`/libtcl.a
	break
      fi
    done
  fi

  # see if one is conveniently installed with the compiler
  if test x"${ac_cv_c_tcllib}" = x ; then	
    orig_libs="$LIBS"
    LIBS="$LIBS -l$installedtcllibroot -lm"    
    AC_TRY_RUN([
    Tcl_AppInit()
    { exit(0); }], ac_cv_c_tcllib="-l$installedtcllibroot", ac_cv_c_tcllib=""
    , ac_cv_c_tclib="-l$installedtcllibroot")
    LIBS="${orig_libs}"
   fi
  ])
  if test x"${ac_cv_c_tcllib}" = x ; then
    TCLLIB="# no Tcl library found"
    AC_MSG_WARN(Can't find Tcl library)
  else
    TCLLIB=${ac_cv_c_tcllib}
    AC_MSG_RESULT(found $TCLLIB)
    no_tcl=
  fi
fi

AC_PROVIDE([$0])
AC_SUBST(TCLLIB)
])