NAME¶

ccom — C compiler

SYNOPSIS¶

DESCRIPTION¶

The ccom utility provides a C compiler. The frontend is usually pcc(1). It is not intended to be run directly.

ccom reads the C source from infile or standard input and writes the assembler source to outfile or to standard output.

The options are as follows:

-g

Enable debugging.

-k

Generate PIC code.

-s

Print statistics to standard error when complete. This includes: name table entries, name string size, permanent allocated memory, temporary allocated memory, lost memory, argument list unions, dimension/function unions, struct/union/enum blocks, inline node count, inline control blocks, and permanent symtab entries.

-v

Display version.

-W flags

Report warnings. (Do some basic checks.) NOTE! These are subject to change RSN! flags is one or more of the following:

error

Report all warnings as errors.

implicit

Implies implicit-function-declaration and implicit-int.

implicit-function-declaration

Report if no prototype was declared for a function.

implicit-int

TODO

missing-prototypes

TODO

strict-prototypes

TODO

W

Enable all warnings.

-X flags

C specific debugging where flags is one or more of the following:

b

Building of parse trees

d

Declarations (using multiple d flags gives more output)

e

Pass1 trees at exit

i

Initializations

n

Memory allocations

o

Turn off optimisations

p

Prototypes

s

Inlining

t

Type conversions

x

Target-specific flag, used in machine-dependent code

-x optimizations

optimizations is one of the following:

deljumps

Delete redundant jumps and dead code.

ssa

Convert statements into SSA form for optimization. Not yet finished.

tailcall

Currently not implemented.

temps

Setting this flag allows variables to be put into registers, for further optimization by the register allocator.

The -x flag can be passed multiple times to set different options.

-Z flags

Code generator (pass2) specific debugging where flags is one or more of the following:

b

Basic block and SSA building

c

Code printout

e

Trees when entering pass2

f

Instruction matcher, may provide much output

n

Memory allocation

o

Instruction generator

r

Register allocator

s

Shape matching in instruction generator

t

Type matching in instruction generator

u

Sethi-Ullman computations

x

Target-specific flag, used in machine-dependent code

SEE ALSO¶

as(1), cpp(1), pcc(1)

HISTORY¶

The ccom compiler is based on the original Portable C Compiler by S. C. Johnson, written in the late 70's. Even though much of the compiler has been rewritten, some of the basics still remain. About 50% of the frontend code and 80% of the backend code has been rewritten. Most is written by Anders Magnusson, with the exception of the data-flow analysis part and the SSA conversion code which is written by Peter A Jonsson, and the Mips port that were written as part of a project by undergraduate students at Lulea University of Technology.

This product includes software developed or owned by Caldera International, Inc.