Systems/C is Dignus' premier C compiler product for the IBM mainframe. Systems/C compiler software allows users to develop mainframe C applications on a mainframe, or on UNIX or Windows workstations.

The Version 2.30 release is available now!

To learn more about the new features in Version 2.30, visit the what's new web page.

Version 2.30 adds the C23 support and enhanced POSIX features.

Version 2.30 of Systems/C focuses on standards adherence, code optimization and generation improvements, and on-going GCC compatibility features, providing improved runtime performance as well as compile-time improvements.

Systems/C is available as a native compiler for OS/390, z/OS and z/Linux, or as a cross-compiler hosted on Windows, AIX, Solaris, Solaris x86, FreeBSD, HP/UX, Mac OS X 386, and Linux.

Also, the documentation is now available as .pdf file. And, you can request a 30-day trial of Systems/C to examine yourself.

Systems/C can be applied to many development tasks.

Did you ever just want to write an assembly routine in a High Level Language, and simply link that in with your existing ASM programs? Systems/C's unique generation of assembly language source (with user-specified function entry and exit, etc..) makes that possible!

Did you ever want to compile your IBM C programs under your workstation's build environment. Imagine compiling IBM C programs under Microsoft's Visual Studio or Eclipse. Systems/C makes that possible!

Did you ever want to compile C programs for the mainframe and package them without worrying about run-time libraries. Systems/C makes that possible!

Did you ever want to directly reference assembly language source from C code, or directly in-line assembly code in the middle of your high-level code? Systems/C makes that possible!

In short, Systems/C takes your development to the "next level!"

Features of Systems/C include:

• ANSI C compiler, ANSI C preprocessor, C Library, pre-linker and linker, archive librarian utilities, a CICS preprocessor and a DB2 preprocessor.

• Available as a native C compiler on OS/390, z/OS and z/Linux, as well as a cross compiler on Windows, AIX, Linux, Solaris (SPARC), Solaris (x86), HP/UX, Mac OS-X 386 and FreeBSD.

• True 64-bit compiler, using the z/Architecture instructions, new floating point registers, immediate instructions, etc.

• Generates formatted and commented ASM source, ready for assembly by HLASM on z/OS or the z/Linux assemblers on z/Linux or z/TPF.

• Supports direct in-line assembly code - including system macros. Allows for access to registers via C variables for readily communicating data between ASM and C code. Also, C source can reference ASM constants, such as EQUate values, DSECT offsets, etc...

• Optimized function entry and exit. Entry and exit macros can be tailored, on a per-function basis, or completely replaced by the user's own macros. The choice of base register can be changed on a per-compilation basis.

• IBM C compatibility mode; where the generated assembler source code, can be freely mixed with IBM C objects. This includes the long long and Decimal data types, as well as several other IBM C language extensions and debugging information.

• Native z/OS support:
  • Cross-memory mode (HASN != PASN != SASN).
    
  • AR mode; extensions to C to add ALET-qualified pointers.
    
  • Full access to OS/390 services via in-line ASM source.
    
  • Allow non-key 8, supervisor state and SRB-mode execution.
    
  • 24/31 bit AMODE.
    
  • Supports DISABLED callers (interrupts) with modified function entry and exit macros.
    

• z/Linux support:
  • Supports GCC-style C language extensions
  • Compiles with the z/Linux system header files (GLIBC), unchanged.
  • Generated objects link with any other z/Linux objects.
  • Can generate Linux assembler source on any supported host platform.
  • Systems/C language extenstions supported, including direct inline assembler source.

• CMS support:
  • Directly callable sytem services, via the inline assembly source feature.
    
  • 24/31/64-bit AMODE.
    
  • AR mode; extensions to C to add ALET-qualified pointers.
    

We've also provided several examples to point out these features. These examples represent work-in-progress; so every feature may not be evident. Furthermore, they are frequently updated; you may want to check often.

Also - you can compile your own source! We've provided a web-based compilation mechanism to submit source and see the output from the Systems/C compiler (DCC), along with the generated assembly language source.