The Watcom C/C++ compiler is esteemed amongst DOS developers by the high execution speed of the compiled code it produces and for having been one of the first compilers to support the Intel 80386 “protected mode”. Though no longer sold commercially by Sybase, the Watcom C/C++ compiler and the Watch Fortran compiler have been made available as the open source Open Watcom package with the assistance of SciTech Software. The code is portable, and like many other open source compiler projects such as gcc, the watcom compiler backend (code generator) is retargetable. The open watcom compiler can be operated from, and generate executable code for, the DOS, OS/2 and Windows operating systems. Open watcom also supports NLM targets for Novell NetWare. There is ongoing work to retarget it for the Linux and modern BSD (eg. FreeBSD) operating systems, running on x86, PowerPC and other processors. The Open Watcom C/C++ version 1.4 release on December 2005 has Linux x86 as an experimental target, supported from NT or OS/2 host platforms. There is code for an abandoned QNX version, but libraries necessary for it to be compiled could not be released as open source. The current version of Watcom is 1.7a was released in October 2007.
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