eclass/kernel-2.eclass: As per PMS remove calls to external command '…

…tr' in global scope. Closes bug 629106.

eclass/kernel-2.eclass

@@ -1410,28 +1410,33 @@ getfilevar() {
 
 detect_arch() {
 
-	local ALL_ARCH LOOP_ARCH COMPAT_URI i
+	local ALL_ARCH LOOP_ARCH LOOP_ARCH_L COMPAT_URI i TC_ARCH_KERNEL
 
 	# COMPAT_URI is the contents of ${ARCH}_URI
 	# ARCH_URI is the URI for all the ${ARCH}_URI patches
 	# ARCH_PATCH is ARCH_URI broken into files for UNIPATCH
 
 	ARCH_URI=""
 	ARCH_PATCH=""
+	TC_ARCH_KERNEL=""
 	ALL_ARCH="ALPHA AMD64 ARM HPPA IA64 M68K MIPS PPC PPC64 S390 SH SPARC X86"
 
 	for LOOP_ARCH in ${ALL_ARCH}; do
 		COMPAT_URI="${LOOP_ARCH}_URI"
 		COMPAT_URI="${!COMPAT_URI}"
 
+		declare -l LOOP_ARCH_L=${LOOP_ARCH}
+
 		[[ -n ${COMPAT_URI} ]] && \
-			ARCH_URI="${ARCH_URI} $(echo ${LOOP_ARCH} | tr '[:upper:]' '[:lower:]')? ( ${COMPAT_URI} )"
+			ARCH_URI="${ARCH_URI} ${LOOP_ARCH_L}? ( ${COMPAT_URI} )"
 
-		if [[ ${LOOP_ARCH} == "$(echo $(tc-arch-kernel) | tr '[:lower:]' '[:upper:]')" ]]; 	then
+		declare -u TC_ARCH_KERNEL=$(tc-arch-kernel)
+		if [[ ${LOOP_ARCH} == ${TC_ARCH_KERNEL} ]]; then
 			for i in ${COMPAT_URI}; do
 				ARCH_PATCH="${ARCH_PATCH} ${DISTDIR}/${i/*\//}"
 			done
 		fi
+
 	done
 }