Portable C Compiler Fund

BSD Fund is pleased to announce that it has partnered with software engineer and researcher Anders Magnusson to bring the Portable C Compiler "pcc" to 1.0 release status. Originally written by Stephen C. Johnson of Bell Labs in the 1970's, pcc is today valued by developers for its speed, simplicity, BSD license and of course, portability. Mr. Magnusson has worked with pcc since 2002 and been project maintainer since 2007.

Work description

Improved Static Single Assignment form conversion functionality

Convert the expression trees in a function to SSA form and back.
SSA form conversions require:

• Creating the Control-Flow Graph (CFG)
• Building a dominator tree
• Calculating the dominance frontiers
• Inserting phi functions
• Renumbering temporary variables

Improved C99 functionality

• Improved complex numbers: Support the _Complex and _Imaginary data types introduced in C99.
• Improved dynamic arrays in function headers/prototypes: Support exists for automatic dynamic arrays but not yet fixed for function headers/prototypes.
• Improved abstract dynamic declarations: Support the ability to use abstract declarators everywhere allowed.

Improved GCC compatibility

• attribute(): Support parsing of the attribute() syntax and test for commonly used extensions.
• typeof(): Support the typeof() keyword.
• Case number ranges: Support giving number ranges to case statements.
• Incomplete Enums: Support forward declaration of enums.
• Unnamed struct/union fields: Support the use of unnamed members compatible with both GCC and the historical use of it.

AMD64 Port

Port the Portable C Compiler to the AMD64 architecture.

• Implement code generation
• Implement FPU code generation
• Implement fPIC code generation

Progress

Watch for completed items above and you can watch commits here.

Future Work

Upon completion and community acceptance of this work, BSD Fund will consider a pcc roadmap that specifies additional features and architecture ports, plus external toolchain components.

Budget

SSA Conversions: $2,900
C99 Improvements: $4,800
GCC Improvements: $1,900
AMD64 Support: $2,400

Total donations needed to complete this work: $12,000
Donations received to date: $7,972

Donate by Check, Money Order or BillPay

Donations by check can be addressed to "BSD Fund" and mailed to:

BSD Fund
560 SE Alexander Ave
Corvallis OR 97333-1933
USA

Please include "pcc Fund" on the check plus your e-mail address so we can send you a receipt for tax purposes.

Donate a Donor

If you are already contributing code or have a limited budget, a referral to a sympathetic employer or philanthropist can be priceless. Such potential donors can contact dexter at bsdfund dot org for more information about this and other BSD Fund efforts.

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