m4/mpd_auto.m4: reduce "eval" bloat

m4/mpd_auto.m4

 AC_DEFUN([MPD_AUTO_ENABLED], [
-	var="enable_$1"
-	feature="$2"
-
-	if eval "test x`echo '$'$var` = xauto"; then
-		AC_MSG_NOTICE([auto-detected $feature])
-		eval "$var=yes"
+	if test x$[]enable_$1 = xauto; then
+		AC_MSG_NOTICE([auto-detected $2])
+		enable_$1=no
 	fi
 ])
 
 AC_DEFUN([MPD_AUTO_DISABLED], [
-	var="enable_$1"
-	feature="$2"
-	msg="$3"
-
-	if eval "test x`echo '$'$var` = xauto"; then
-		AC_MSG_WARN([$msg -- disabling $feature])
-		eval "$var=no"
-	elif eval "test x`echo '$'$var` = xyes"; then
-		AC_MSG_ERROR([$feature: $msg])
+	if test x$[]enable_$1 = xauto; then
+		AC_MSG_WARN([$3 -- disabling $2])
+		enable_$1=no
+	elif test x$[]enable_$1 = xyes; then
+		AC_MSG_ERROR([$2: $3])
 	fi
 ])
 
@@ -25,40 +18,28 @@ dnl Check whether a prerequisite for a feature was found.  This is
 dnl very similar to MPD_AUTO_RESULT, but does not finalize the
 dnl detection; it assumes that more checks will follow.
 AC_DEFUN([MPD_AUTO_PRE], [
-	name="$1"
-	var="enable_$1"
-	found="found_$name"
-	feature="$2"
-	msg="$3"
-
-	if eval "test x`echo '$'$var` != xno" && eval "test x`echo '$'$found` = xno"; then
-                MPD_AUTO_DISABLED([$name], [$feature], [$msg])
+	if test x$[]enable_$1 != xno && test x$[]found_$1 = xno; then
+                MPD_AUTO_DISABLED([$1], [$2], [$3])
 	fi
 ])
 
 AC_DEFUN([MPD_AUTO_RESULT], [
-	name="$1"
-	var="enable_$1"
-	found="found_$name"
-	feature="$2"
-	msg="$3"
-
-	if eval "test x`echo '$'$var` = xno"; then
-		eval "$found=no"
+	if test x$[]enable_$1 = xno; then
+		found_$1=no
 	fi
 
-	if eval "test x`echo '$'$found` = xyes"; then
-                MPD_AUTO_ENABLED([$name], [$feature])
+	if test x$[]found_$1 = xyes; then
+                MPD_AUTO_ENABLED([$1], [$2])
 	else
-                MPD_AUTO_DISABLED([$name], [$feature], [$msg])
+                MPD_AUTO_DISABLED([$1], [$2], [$3])
 	fi
 ])
 
 AC_DEFUN([MPD_AUTO_PKG], [
-	if eval "test x`echo '$'enable_$1` != xno"; then
+	if test x$[]enable_$1 != xno; then
 		PKG_CHECK_MODULES([$2], [$3],
-			[eval "found_$1=yes"],
-			[eval "found_$1=no"])
+			[found_$1=yes],
+			[found_$1=no])
 	fi
 
 	MPD_AUTO_RESULT([$1], [$4], [$5])
@@ -68,12 +49,12 @@ dnl Check with pkg-config first, fall back to AC_CHECK_LIB.
 dnl
 dnl Parameters: varname1, varname2, pkgname, libname, symname, libs, cflags, description, errmsg
 AC_DEFUN([MPD_AUTO_PKG_LIB], [
-	if eval "test x`echo '$'enable_$1` != xno"; then
+	if test x$[]enable_$1 != xno; then
 		PKG_CHECK_MODULES([$2], [$3],
-			[eval "found_$1=yes"],
+			[found_$1=yes],
 			AC_CHECK_LIB($4, $5,
-				[eval "found_$1=yes $2_LIBS='$6' $2_CFLAGS='$7'"],
-				[eval "found_$1=no"],
+				[found_$1=yes $2_LIBS='$6' $2_CFLAGS='$7'],
+				[found_$1=no],
 				[$6]))
 	fi
 
@@ -87,10 +68,10 @@ AC_DEFUN([MPD_AUTO_LIB], [
 	AC_SUBST([$2_LIBS], [])
 	AC_SUBST([$2_CFLAGS], [])
 
-	if eval "test x`echo '$'enable_$1` != xno"; then
+	if test x$[]enable_$1 != xno; then
 		AC_CHECK_LIB($3, $4,
-			[eval "found_$1=yes $2_LIBS='$5' $2_CFLAGS='$6'"],
-			[eval "found_$1=no"],
+			[found_$1=yes $2_LIBS='$5' $2_CFLAGS='$6'],
+			[found_$1=no],
 			[$5])
 	fi