no alternate value expansion

* configure.in (opt-dir), tool/ifchange: get rid of "alternate value"
  expansion for legacy sh.  [ruby-dev:47420] [Bug #8524]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@41280 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

ChangeLog

@@ -1,3 +1,8 @@
+Thu Jun 13 21:30:14 2013  Nobuyoshi Nakada  <nobu@ruby-lang.org>
+
+	* configure.in (opt-dir), tool/ifchange: get rid of "alternate value"
+	  expansion for legacy sh.  [ruby-dev:47420] [Bug #8524]
+
 Thu Jun 13 21:24:09 2013  Tanaka Akira  <akr@fsij.org>
 
 	* bignum.c (bigdivrem): Refactored to use ALLOCV_N for temporary

configure.in

@@ -2625,8 +2625,10 @@ AC_ARG_WITH(opt-dir,
 			sed "s/^x *//;s${IFS}"'%1\\$-s'"${IFS}${dir}/lib${IFS}g;s${IFS}%s${IFS}${dir}/lib${IFS}g"
 		    done | tr '\012' ' '`
 		LDFLAGS_OPTDIR="$val"
-		LDFLAGS="$LDFLAGS${LDFLAGS:+ }$val"
-		DLDFLAGS="$DLDFLAGS${DLDFLAGS:+ }$val"
+		test x"${LDFLAGS}" = x || LDFLAGS="$LDFLAGS "
+		LDFLAGS="$LDFLAGS$val"
+		test x"${DLDFLAGS}" = x || DLDFLAGS="$DLDFLAGS "
+		DLDFLAGS="$DLDFLAGS$val"
 	])
 
 AS_CASE(["$target_cpu-$target_os"],

tool/ifchange

@@ -1,6 +1,7 @@
 #!/bin/sh
 # usage: ifchange target temporary
 
+set -e
 timestamp=
 keepsuffix=
 until [ "$0" = 0 ]; do
@@ -37,7 +38,7 @@ if cmp "$target" "$temp" >/dev/null 2>&1; then
     rm -f "$temp"
 else
     echo "$target updated"
-    ${keepsuffix:+ mv -f "$target" "${target}${keepsuffix}" }
+    [ x"${keepsuffix}" = x ] || mv -f "$target" "${target}${keepsuffix}"
     mv -f "$temp" "$target"
 fi