Warning for unsafe/insecure functions

[Rajeev Bansal via Gcc-help <gcc-help@xxxxxxxxxxx>]

 Hi All,

  I am looking for if gcc has the capability to report unsafe/insecure
functions used in a C Or CPP program? For example : if strcpy(), strcat(),
alloca(), atoi() etc. are used in a program then gcc should raise a
warning.

In my google search and gcc man page I couldn't find any gcc flags for this
purpose. Let's say if gcc doesn't have the inbuilt capability of reporting
of insecure function calls so how can I add  this functionality in gcc?

Thanks,
-Rajeev