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OS X shell is incompatible with echo -n

Built in echo in 'sh' on OS X does not support -n (exclude trailing
newline). It's not necessary so just leave it off. Fixes issue 390.

Build include guard using 'symbol' so that it is more likely to be
unique.

Change-Id: I4bc6aa1fc5e02228f71c200214b5ee4a16d56b83

--- a/build/make/rtcd.sh

+++ b/build/make/rtcd.sh

@@ -196,8 +196,8 @@

 # Helper functions for generating the arch specific RTCD files

 #

 common_top() {

-  local outfile_basename=$(basename ${outfile:-rtcd.h})

-  local include_guard=$(echo -n $outfile_basename | tr '[a-z]' '[A-Z]' | tr -c '[A-Z]' _)

+  local outfile_basename=$(basename ${symbol:-rtcd.h})

+  local include_guard=$(echo $outfile_basename | tr '[a-z]' '[A-Z]' | tr -c '[A-Z]' _)

   cat <<EOF

 #ifndef ${include_guard}

 #define ${include_guard}

@@ -225,7 +225,7 @@

   # Assign the helper variable for each enabled extension

   for opt in $ALL_ARCHS; do

-    local uc=$(echo -n $opt | tr '[a-z]' '[A-Z]')

+    local uc=$(echo $opt | tr '[a-z]' '[A-Z]')

     eval "have_${opt}=\"flags & HAS_${uc}\""

   done

@@ -253,7 +253,7 @@

   # Assign the helper variable for each enabled extension

   for opt in $ALL_ARCHS; do

-    local uc=$(echo -n $opt | tr '[a-z]' '[A-Z]')

+    local uc=$(echo $opt | tr '[a-z]' '[A-Z]')

     eval "have_${opt}=\"flags & HAS_${uc}\""

   done