Patch to configure.in

[Jason Merrill <jason at cygnus dot com>]

I noticed once that --disable-checking didn't work, that it turned checking
on instead of off.  After some investigation, I found that the AC_ARG_*
macros execute the second argument for --disable as well as --enable.  This
patch fixes the arguments that don't properly check for the "no" case.  I
also added sanity checks; "yes" doesn't make much sense for a directory.

It might be useful to write the other option handlers more like this, as
well.

Tue Jul 28 00:20:33 1998  Jason Merrill  <jason@yorick.cygnus.com>

	* configure.in: Fix --without/--disable cases for local-prefix, 
	gxx-include-dir and checking.

Index: configure.in
===================================================================
RCS file: /egcs/carton/cvsfiles/egcs/gcc/configure.in,v
retrieving revision 1.133
diff -c -p -r1.133 configure.in
*** configure.in	1998/07/27 11:56:11	1.133
--- configure.in	1998/07/28 07:21:23
*************** elf="$with_elf",
*** 56,85 ****
  elf=no)
  
  # Specify the local prefix
  AC_ARG_WITH(local-prefix,
  [  --with-local-prefix=DIR specifies directory to put local include.],
! local_prefix=$with_local_prefix,
! local_prefix=/usr/local)
  
  # Default local prefix if it is empty
  if [[ x$local_prefix = x ]]; then
  	local_prefix=/usr/local
  fi
  
  # Specify the g++ header file directory
  AC_ARG_WITH(gxx-include-dir,
  [  --with-gxx-include-dir=DIR
                            specifies directory to put g++ header files.],
! gxx_include_dir=$with_gxx_include_dir,
! if test x${enable_version_specific_runtime_libs} = xyes; then
! gxx_include_dir='${libsubdir}/include/g++'
! else gxx_include_dir='${prefix}/include/g++'; fi)
  
  # Enable expensive internal checks
  AC_ARG_ENABLE(checking,
  [  --enable-checking       enable expensive run-time checks.],
! AC_DEFINE(ENABLE_CHECKING)  
! )
  
  # Enable use of cpplib for C.
  cpp_main=cccp
--- 56,102 ----
  elf=no)
  
  # Specify the local prefix
+ local_prefix=
  AC_ARG_WITH(local-prefix,
  [  --with-local-prefix=DIR specifies directory to put local include.],
! [case "${withval}" in
! yes)	AC_MSG_ERROR(bad value ${withval} given for local include directory prefix) ;;
! no)	;;
! *)	local_prefix=$with_local_prefix ;;
! esac])
  
  # Default local prefix if it is empty
  if [[ x$local_prefix = x ]]; then
  	local_prefix=/usr/local
  fi
  
+ gxx_include_dir=
  # Specify the g++ header file directory
  AC_ARG_WITH(gxx-include-dir,
  [  --with-gxx-include-dir=DIR
                            specifies directory to put g++ header files.],
! [case "${withval}" in
! yes)	AC_MSG_ERROR(bad value ${withval} given for g++ include directory) ;;
! no)	;;
! *)	gxx_include_dir=$with_gxx_include_dir ;;
! esac])
  
+ if test x${gxx_include_dir} = x; then
+   if test x${enable_version_specific_runtime_libs} = xyes; then
+     gxx_include_dir='${libsubdir}/include/g++'
+   else
+     gxx_include_dir='${prefix}/include/g++'
+   fi
+ fi
+ 
  # Enable expensive internal checks
  AC_ARG_ENABLE(checking,
  [  --enable-checking       enable expensive run-time checks.],
! [case "${enableval}" in
! yes)	AC_DEFINE(ENABLE_CHECKING) ;;
! no)	;;
! *)	AC_MSG_ERROR(bad value ${enableval} given for checking option) ;;
! esac])
  
  # Enable use of cpplib for C.
  cpp_main=cccp