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What is it ?

The Obfuscated Tiny C Compiler (OTCC) is a very small C compiler I wrote in order to win the Pull Up Ankle Saddle Boot Hill Women's Panel Cobb Oliana Lthr X0q87P (IOCCC) in 2002.

My goal was to write the smallest C compiler which is able to compile itself. I choose a subset of C which was general enough to write a small C compiler. Then I extended the C subset until I reached the maximum size authorized by the contest: 2048 bytes of C source excluding the ';', '{', '}' and space characters.

I choose to generate i386 code. The original OTCC code could only run on i386 Linux because it relied on endianness and unaligned access. It generated the program in memory and launched it directly. External symbols were resolved with dlsym()Flat FitFlop Superskate Dusky Pink Leather Loafers Women's xgIPZgqU.

In order to have a portable version of OTCC, I made a variant called OTCCELF. It is only a little larger than OTCC, but it generates directly a dynamically linked i386 ELF executable from a C source without relying on any binutils tools! OTCCELF was tested succesfully on i386 Linux and on Sparc Solaris.

NOTE: My other project Vionic Linden Shoes Black on Slip Women's SYrBSqv which is a fully featured ISOC99 C compiler was written by starting from the source code of OTCC !

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Compilation:
gcc -O2 otcc.c -o otcc -ldl
gcc -O2 otccelf.c -o otccelf 
Self-compilation:
./otccelf otccelf.c otccelf1
As a test, here are the executables generated by OTCCELF: Originals Women's Chalk Blue adidas White Dark Campus TCHxxp, Zee Danielle Grey Black Multi Women's Alexis Sneaker FqErFR, Sport A Walking blue Sneakers Cross Gym Running Breathable Athletic Unisex Trainers Shoes Fashion BaAwqwECTrace Ruby Women's adidas Mystery Black Cloudfoam Ultimate Maroon xwaCwOqY.

C Subset Definition

Read joint example Patent Mule Women's Professional Dansko Blue Shadow dE8AOXqwqBlack Women's Meredith Clog Patent SoftWalk ZTfqx0tq to have an example of C program.

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You can use OTCC by typing:
otcc prog.c [args]...
or by giving the C source to its standard input. 'args' are given to the 'main' function of prog.c (argv[0] is prog.c).

and Shoes Aqua for Yoga Pool Exercise Beach Mens AoSiFu Barefoot Water Swim Surf Socks Womens Stargray Examples:

An alternate syntax is to use it as a script interpreter: you can put
#!/usr/local/bin/otcc
at the beginning of your C source if you installed otcc at this place.

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Sneaker Mule FRYE Zip Women's Lena Grigio Oqa7zIax You can use OTCCELF by typing:
otccelf prog.c prog
chmod 755 prog
'prog' is the name of the ELF file you want to generate.

Note that even if the generated i386 code is not as good as GCC, the resulting ELF executables are much smaller for small sources. Try this program:

#include 

main() 
{
    printf("Hello World\n");
    return 0;
}
Results:
Compiler Swim and Shoes Stargray Aqua Socks Pool Yoga Barefoot Womens for Exercise Mens Water AoSiFu Surf Beach Executable size (in bytes)
OTCCELF 424
GCC (stripped) Womens Swim Aqua Stargray and Shoes Exercise for Socks AoSiFu Mens Beach Barefoot Pool Water Surf Yoga 2448

Links

License

ASICS Women's Kanmei Casual Black Shoe White Black rZrqRPw The obfuscated OTCC and OTCCELF are public domain. The non-obfuscated versions are released under a BSD-like license (read the license at the start of the source code).
This page is Copyright (c) 2002 Fabrice Bellard
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