autoconf: update to latest for fix of M4 detection.

[bison.git] / bootstrap

diff --git a/bootstrap b/bootstrap
index 02176d280a61ec7877bfe610a8e39ff4aadf4842..00ea4bc1a30720e57df209c806220d974ad61c5f 100755 (executable)
--- a/bootstrap
+++ b/bootstrap
@@ -36,7 +36,7 @@ bt_regex=`echo "$bt"| sed 's/\./[.]/g'`
 bt2=${bt}2
 
 usage() {
-  echo >&2 "\
+  cat <<EOF
 Usage: $0 [OPTION]...
 Bootstrap this package from the checked-out sources.
 
@@ -57,7 +57,7 @@ If the file bootstrap.conf exists in the current working directory, its
 contents are read as shell variables to configure the bootstrap.
 
 Running without arguments will suffice in most cases.
-"
+EOF
 }
 
 # Configuration.
@@ -142,29 +142,37 @@ vc_ignore=auto
 
 # find_tool ENVVAR NAMES...
 # -------------------------
+# Look for some needed program.  Use the value of the ENVVAR if set,
+# otherwise look for the first of the NAMES that can be run (i.e.,
+# supports --version).  If found, set ENVVAR to the program name,
+# die otherwise.
 find_tool ()
 {
+  # Find sha1sum, named gsha1sum on MacPorts.
   find_tool_envvar=$1
   shift
-  find_tool_name=$@
-  if eval test x"\$$find_tool_envvar" = x; then
+  find_tool_names=$@
+  eval "find_tool_res=\$$find_tool_envvar"
+  if test x"$find_tool_res" = x; then
     for i
     do
       if ($i --version </dev/null) >/dev/null 2>&1; then
-       find_tool_res=$i
-       break
+       find_tool_res=$i
+       break
       fi
     done
+  else
+    find_tool_error_prefix="\$$find_tool_envvar: "
   fi
   if test x"$find_tool_res" = x; then
     echo >&2 "$0: one of these is required: $find_tool_names"
     exit 1
   fi
   ($find_tool_res --version </dev/null) >/dev/null 2>&1 || {
-    echo >&2 "$0: cannot run $find_tool_res --version"
+    echo >&2 "$0: ${find_tool_error_prefix}cannot run $find_tool_res --version"
     exit 1
   }
-  eval "$find_tool_envvar=\"$find_tool_res\""
+  eval "$find_tool_envvar=\$find_tool_res"
   eval "export $find_tool_envvar"
 }