The problem with tools which try to understand the code themselves is that there is a mismatch between what is build by for example a Makefile and what the editor sees. We are building embedded software using a huge pile of Makefiles and using cross compilers using a lot of product dependent #defines. What is required for us is: find declaration/implementation, find usages of function, find applicable defines, have no false positives for functions which are behind compile options and are #ifdeffed out. The only IDE which works correctly is eclipse CDT. I think it works by scanning the make processes' output for defines. Are there other good tools which work ok for my scenario ?