autoconf: put location of 'dtc' into config.h

4 files changed, 52 insertions, 0 deletions

diff --git a/README.md b/README.md
index 901c7f4..a5ed802 100644
--- a/README.md
+++ b/README.md
@@ -19,6 +19,7 @@ Build Steps
 We assume that the RISCV environment variable is set to the RISC-V tools
 install path, and that the riscv-fesvr package is installed there.
 
+    $ apt-get install device-tree-compiler
     $ mkdir build
     $ cd build
     $ ../configure --prefix=$RISCV --with-fesvr=$RISCV
diff --git a/config.h.in b/config.h.in
index 566b1bc..15b5850 100644
--- a/config.h.in
+++ b/config.h.in
@@ -6,6 +6,9 @@
 /* Default value for --isa switch */
 #undef DEFAULT_ISA
 
+/* Path to the device-tree-compiler */
+#undef DTC
+
 /* Define if subproject MCPPBS_SPROJ_NORM is enabled */
 #undef DUMMY_ROCC_ENABLED
 
diff --git a/configure b/configure
index 4c272b3..eddc147 100755
--- a/configure
+++ b/configure
@@ -636,6 +636,7 @@ enable_stow
 EGREP
 GREP
 CXXCPP
+DTC
 RANLIB
 AR
 ac_ct_CXX
@@ -3378,6 +3379,51 @@ else
   RANLIB="$ac_cv_prog_RANLIB"
 fi
 
+# Extract the first word of "dtc", so it can be a program name with args.
+set dummy dtc; ac_word=$2
+{ $as_echo "$as_me:${as_lineno-$LINENO}: checking for $ac_word" >&5
+$as_echo_n "checking for $ac_word... " >&6; }
+if ${ac_cv_path_DTC+:} false; then :
+  $as_echo_n "(cached) " >&6
+else
+  case $DTC in
+  [\\/]* | ?:[\\/]*)
+  ac_cv_path_DTC="$DTC" # Let the user override the test with a path.
+  ;;
+  *)
+  as_save_IFS=$IFS; IFS=$PATH_SEPARATOR
+for as_dir in $PATH
+do
+  IFS=$as_save_IFS
+  test -z "$as_dir" && as_dir=.
+    for ac_exec_ext in '' $ac_executable_extensions; do
+  if as_fn_executable_p "$as_dir/$ac_word$ac_exec_ext"; then
+    ac_cv_path_DTC="$as_dir/$ac_word$ac_exec_ext"
+    $as_echo "$as_me:${as_lineno-$LINENO}: found $as_dir/$ac_word$ac_exec_ext" >&5
+    break 2
+  fi
+done
+  done
+IFS=$as_save_IFS
+
+  ;;
+esac
+fi
+DTC=$ac_cv_path_DTC
+if test -n "$DTC"; then
+  { $as_echo "$as_me:${as_lineno-$LINENO}: result: $DTC" >&5
+$as_echo "$DTC" >&6; }
+else
+  { $as_echo "$as_me:${as_lineno-$LINENO}: result: no" >&5
+$as_echo "no" >&6; }
+fi
+
+
+
+cat >>confdefs.h <<_ACEOF
+#define DTC "$DTC"
+_ACEOF
+
 
 
 ac_ext=cpp
diff --git a/configure.ac b/configure.ac
index dbf50c9..ea64de7 100644
--- a/configure.ac
+++ b/configure.ac
@@ -51,6 +51,8 @@ AC_PROG_CC
 AC_PROG_CXX
 AC_CHECK_TOOL([AR],[ar])
 AC_CHECK_TOOL([RANLIB],[ranlib])
+AC_PATH_PROG([DTC],[dtc])
+AC_DEFINE_UNQUOTED(DTC, ["$DTC"], [Path to the device-tree-compiler])
 
 AC_C_BIGENDIAN(AC_MSG_ERROR([Spike requires a little-endian host]))