Don't use xcode clang as it is weirdly broken

this will require people to install LLVM to compile stuff, but we already have them do this for libtool and bison anyway.

compile.sh

@@ -100,34 +100,30 @@ done
 type wget >> "$DIR/install.log" 2>&1 || type curl >> "$DIR/install.log" || { write_error "Please install \"wget\" or \"curl\""; ((ERRORS++)); }
 
 if [ "$(uname -s)" == "Darwin" ]; then
-	type glibtool >> "$DIR/install.log" 2>&1 || { write_error "Please install GNU libtool"; ((ERRORS++)); }
+	type glibtool >> "$DIR/install.log" 2>&1 || { write_error "Please install 'libtool' using Homebrew."; ((ERRORS++)); }
 	export LIBTOOL=glibtool
 	export LIBTOOLIZE=glibtoolize
-	export PATH="/opt/homebrew/opt/bison/bin:$PATH"
-	[[ $(bison --version) == "bison (GNU Bison) 3."* ]] || { write_error "MacOS bundled bison is too old. Install bison using Homebrew and update your PATH variable according to its instructions before running this script."; ((ERRORS++)); }
+	export PATH="/opt/homebrew/opt/bison/bin:/opt/homebrew/opt/llvm/bin:$PATH"
+	[[ $(clang --version) == "Apple clang"* ]] && { write_error "MacOS bundled clang is broken. Install 'llvm' using Homebrew."; ((ERRORS++)); }
+	[[ $(bison --version) == "bison (GNU Bison) 3."* ]] || { write_error "MacOS bundled bison is too old. Install 'bison' using Homebrew."; ((ERRORS++)); }
+
+	export CC="clang"
+	export CXX="clang++"
+	export RANLIB="llvm-ranlib"
 else
 	type libtool >> "$DIR/install.log" 2>&1 || { write_error "Please install \"libtool\" or \"libtool-bin\""; ((ERRORS++)); }
 	export LIBTOOL=libtool
 	export LIBTOOLIZE=libtoolize
+
+	export CC="gcc"
+	export CXX="g++"
+	export RANLIB=ranlib
 fi
 
 if [ $ERRORS -ne 0 ]; then
 	exit 1
 fi
 
-#if type llvm-gcc >/dev/null 2>&1; then
-#	export CC="llvm-gcc"
-#	export CXX="llvm-g++"
-#	export AR="llvm-ar"
-#	export AS="llvm-as"
-#	export RANLIB=llvm-ranlib
-#else
-	export CC="gcc"
-	export CXX="g++"
-	#export AR="gcc-ar"
-	export RANLIB=ranlib
-#fi
-
 COMPILE_FOR_ANDROID=no
 HAVE_MYSQLI="--enable-mysqlnd --with-mysqli=mysqlnd"
 COMPILE_TARGET=""