Tiny C Compiler is a Scripts software developed by Fabrice Bellard. After our trial and test, the software is proved to be official, secure and free. Here is the official description for Tiny C Compiler:

if you want to compile the Linux kernel with TCC, you must use a custom build script as in TCCBOOT . I never tried to compile the Linux kernel with TinyCC and the standard Linux Makefiles.

Features
SMALL! You can compile and execute C code everywhere, for example on rescue disks (about 100KB for x86 TCC executable, including C preprocessor, C compiler, assembler and linker).
FAST! tcc generates x86 code. No byte code overhead. Compile, Assemble and Link several times faster than GCC.
UNLIMITED! Any C dynamic Library can be used directly. TCC is heading torward full ISOC99 compliance. TCC can of course compile itself.
SAFE! tcc includes an optional memory and bound checker. Bound checked code can be mixed freely with standard code.
Compile and execute C source directly. No linking or assembly necessary. Full C preprocessor and GNU-like assembler included.
C script supported : just add '#!/usr/local/bin/tcc -run' at the first line of your C source, and execute it directly from the command line.
With libtcc, you can use TCC as a backend for Dynamic Code generation.