Fix hard-coded path to DTC that breaks packaging (#428)

configure.ac included code which detects and inserted a full path
to dtc. Unfortunately, when building with a packaging system, this
path reflects the path under a staged building area.

Also the inclusion of a full path breaks the use case where someone
keeps two versions of dtc on their computer and sets their PATH to
switch between them. spike will continue to use the one on their PATH
when it was built rather than the intended one.

Co-authored-by: Joel Sherrill <joel@rtems.org>

configure

@@ -676,7 +676,6 @@ infodir
 docdir
 oldincludedir
 includedir
-runstatedir
 localstatedir
 sharedstatedir
 sysconfdir
@@ -761,7 +760,6 @@ datadir='${datarootdir}'
 sysconfdir='${prefix}/etc'
 sharedstatedir='${prefix}/com'
 localstatedir='${prefix}/var'
-runstatedir='${localstatedir}/run'
 includedir='${prefix}/include'
 oldincludedir='/usr/include'
 docdir='${datarootdir}/doc/${PACKAGE_TARNAME}'
@@ -1014,15 +1012,6 @@ 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=$ac_optarg ;;
-
   -sbindir | --sbindir | --sbindi | --sbind | --sbin | --sbi | --sb)
     ac_prev=sbindir ;;
   -sbindir=* | --sbindir=* | --sbindi=* | --sbind=* | --sbin=* \
@@ -1160,7 +1149,7 @@ fi
 for ac_var in	exec_prefix prefix bindir sbindir libexecdir datarootdir \
 		datadir sysconfdir sharedstatedir localstatedir includedir \
 		oldincludedir docdir infodir htmldir dvidir pdfdir psdir \
-		libdir localedir mandir runstatedir
+		libdir localedir mandir
 do
   eval ac_val=\$$ac_var
   # Remove trailing slashes.
@@ -1313,7 +1302,6 @@ 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]
@@ -3630,7 +3618,7 @@ if test x"$DTC" == xno; then :
 fi
 
 cat >>confdefs.h <<_ACEOF
-#define DTC "$DTC"
+#define DTC "dtc"
 _ACEOF
 
 

configure.ac

@@ -58,7 +58,7 @@ AC_CHECK_TOOL([AR],[ar])
 AC_CHECK_TOOL([RANLIB],[ranlib])
 AC_PATH_PROG([DTC],[dtc],[no])
 AS_IF([test x"$DTC" == xno],AC_MSG_ERROR([device-tree-compiler not found]))
-AC_DEFINE_UNQUOTED(DTC, ["$DTC"], [Path to the device-tree-compiler])
+AC_DEFINE_UNQUOTED(DTC, ["dtc"], [Executable name of device-tree-compiler])
 
 AC_C_BIGENDIAN