GCC plugins

hello print "hello" on the screen

myplugin1 print AST tree

nullpointer1 scan for null pointer dereferencing. example: if (ab || ab->a == 0)

dump-tree-xml dump AST tree in xml format

Note: A working GCC development environment is needed. I use this command to configure: ../configure --enable-languages=c,c++ --disable-multilib --enable-checks=all --program-suffix=-dev