bashrc & zshrc: use clang when installed

clang sounds interesting and ZNC and WeeChat have automatic testing for
it and I have successfully compiled Python with it. Setting bash/zshrc
to use it seems like a good way to test what support it and what
doesn't.

bashrc

@@ -801,6 +801,21 @@ erase-mbr() {
     echo dd if=/dev/zero of=$1 bs=512 count=2
 }
 
+# Use clang if installed. It seems interesting and this is probably good
+# way to test it. This might not be a function, but I don't have any better
+# place for this.
+if hash clang 2>/dev/null; then
+    export CC=clang
+else
+    unset CC
+fi
+
+if hash clang++ 2>/dev/null; then
+    export CXX=clang++
+else
+    unset CXX
+fi
+
 # .custom
 if [ -f ~/.custom ]; then
     source ~/.custom

zshrc

@@ -10,7 +10,7 @@ UNAME=$(uname)
 
 # enable terminal bell
 
-if [ -f /usr/bin/xset ];
+if [[ -f /usr/bin/xset ]];
 then
     (xset b on&)
 fi
@@ -774,6 +774,22 @@ erase-mbr() {
     echo dd if=/dev/zero of=$1 bs=512 count=2
 }
 
+# Use clang if installed. It seems interesting and this is probably good
+# way to test it. This might not be a function, but I don't have any better
+# place for this.
+if hash clang 2>/dev/null; then
+    export CC=clang
+else
+    unset CC
+fi
+
+if hash clang++ 2>/dev/null; then
+    export CXX=clang++
+else
+    unset CXX
+fi
+
+
 # Source files for miscannellious modifications.
 
 # .custom