configure.ac: configurable tooldir install path

This patch is required to fix how the newlib headers are installed
when using a sysroot install directory.

The cross compiler expects headers to be in
.../host/usr/arm-none-eabi/sysroot/usr/include/newlib.h
by default newlib installed the headers into
.../host/usr/arm-none-eabi/sysroot/usr/arm-none-eabi/include/newlib.h

${exec_prefix} provides the .../host/usr/arm-none-eabi/sysroot path
${target_noncanonical} provides an extra arm-none-eabi/ that must be removed.

With this patch, users can specify the tooldir path that is needed.

Signed-off-by: Neal Frager <neal.frager@amd.com>
Co-developed-by: Chris Wardman <cjwfirmware@vxmdesign.com>

configure

@@ -755,6 +755,7 @@ infodir
 docdir
 oldincludedir
 includedir
+runstatedir
 localstatedir
 sharedstatedir
 sysconfdir
@@ -822,6 +823,7 @@ enable_stage1_languages
 enable_objc_gc
 with_build_sysroot
 with_debug_prefix_map
+with_tooldir
 with_build_config
 enable_vtable_verify
 enable_serial_configure
@@ -915,6 +917,7 @@ datadir='${datarootdir}'
 sysconfdir='${prefix}/etc'
 sharedstatedir='${prefix}/com'
 localstatedir='${prefix}/var'
+runstatedir='${localstatedir}/run'
 includedir='${prefix}/include'
 oldincludedir='/usr/include'
 docdir='${datarootdir}/doc/${PACKAGE}'
@@ -1167,6 +1170,15 @@ do
   | -silent | --silent | --silen | --sile | --sil)
     silent=yes ;;
 
+  -runstatedir | --runstatedir | --runstatedi | --runstated \
+  | --runstate | --runstat | --runsta | --runst | --runs \
+  | --run | --ru | --r)
+    ac_prev=runstatedir ;;
+  -runstatedir=* | --runstatedir=* | --runstatedi=* | --runstated=* \
+  | --runstate=* | --runstat=* | --runsta=* | --runst=* | --runs=* \
+  | --run=* | --ru=* | --r=*)
+    runstatedir=$ac_optarg ;;
+
   -sbindir | --sbindir | --sbindi | --sbind | --sbin | --sbi | --sb)
     ac_prev=sbindir ;;
   -sbindir=* | --sbindir=* | --sbindi=* | --sbind=* | --sbin=* \
@@ -1304,7 +1316,7 @@ fi
 for ac_var in	exec_prefix prefix bindir sbindir libexecdir datarootdir \
 		datadir sysconfdir sharedstatedir localstatedir includedir \
 		oldincludedir docdir infodir htmldir dvidir pdfdir psdir \
-		libdir localedir mandir
+		libdir localedir mandir runstatedir
 do
   eval ac_val=\$$ac_var
   # Remove trailing slashes.
@@ -1464,6 +1476,7 @@ Fine tuning of the installation directories:
   --sysconfdir=DIR        read-only single-machine data [PREFIX/etc]
   --sharedstatedir=DIR    modifiable architecture-independent data [PREFIX/com]
   --localstatedir=DIR     modifiable single-machine data [PREFIX/var]
+  --runstatedir=DIR       modifiable per-process data [LOCALSTATEDIR/run]
   --libdir=DIR            object code libraries [EPREFIX/lib]
   --includedir=DIR        C header files [PREFIX/include]
   --oldincludedir=DIR     C header files for non-gcc [/usr/include]
@@ -1592,6 +1605,7 @@ Optional Packages:
                           use sysroot as the system root during the build
   --with-debug-prefix-map='A=B C=D ...'
                           map A to B, C to D ... in debug information
+  --with-tooldir=PATH     use given path to install target tools after build
   --with-build-config='NAME NAME2...'
                           use config/NAME.mk build configuration
   --with-build-time-tools=PATH
@@ -7057,7 +7071,21 @@ esac
 
 # Some systems (e.g., one of the i386-aix systems the gas testers are
 # using) don't handle "\$" correctly, so don't use it here.
-tooldir='${exec_prefix}'/${target_noncanonical}
+
+# Check whether --with-tooldir was given.
+if test "${with_tooldir+set}" = set; then :
+  withval=$with_tooldir; case x"$withval" in #(
+  x/*) :
+     ;; #(
+  *) :
+    as_fn_error $? "argument to --with-tooldir must be an absolute path" "$LINENO" 5 ;;
+esac
+
+else
+  with_tooldir='${exec_prefix}'/${target_noncanonical}
+fi
+
+tooldir=${with_tooldir}
 build_tooldir=${tooldir}
 
 # Create a .gdbinit file which runs the one in srcdir

configure.ac

@@ -2599,7 +2599,15 @@ esac
 
 # Some systems (e.g., one of the i386-aix systems the gas testers are
 # using) don't handle "\$" correctly, so don't use it here.
-tooldir='${exec_prefix}'/${target_noncanonical}
+AC_ARG_WITH([tooldir],
+  [AS_HELP_STRING([--with-tooldir=PATH],
+		[use given path to install target tools after build])],
+  [AS_CASE([x"$withval"],
+	[x/*],,
+	[AC_MSG_ERROR([argument to --with-tooldir must be an absolute path])])
+  ],
+  [with_tooldir='${exec_prefix}'/${target_noncanonical}])
+tooldir=${with_tooldir}
 build_tooldir=${tooldir}
 
 # Create a .gdbinit file which runs the one in srcdir