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DJGPP (DJ's GNU Programming Platform) is a 32-bit C/C++/ObjC/ObjC++/Ada/Fortran development suite for 386+ PCs that runs under DOS or compatibles. It is guided by DJ Delorie, who started the project in 1989. It is a port of the popular gcc compiler, as well as many other GNU utilities such as bash, find, tar, ls, mv, awk, sed, and ld to DPMI (DOS Protected Mode Interface). It uses a flat memory model, where code and data segments are coincident. Additional segments can be accessed indirectly.
DJGPP presents the programmer an interface which is compatible with the ANSI C and C99 standards, unofficial DOS standards, and the POSIX UNIX standard. Compiled binaries are long file name-aware and handle such filenames under Windows 9x+ by default. TSRs to support LFNs under Windows NT 4 or pure DOS are available.
Whilst DJGPP runs in protected mode, it has a 16-bit stub which performs the switch into protected mode. Because the x86-64 versions of Windows lack support for 16-bit programs, DJGPP cannot be used under these systems, except through emulation (e.g. DOSBox) or similar (e.g. DOSEMU). This problem arises because x86-64 processors in long mode do not support the virtual 8086 mode used to run 16-bit code in 32-bit x86 processors.
Unofficial or unfinished ports