SYNOPSISc2hs [OPTIONS]... header-file binding-file
DESCRIPTIONThis manual page briefly describes the c2hs command. For more details, refer to the main documentation, which is available in various other formats, including SGML and HTML; see below.
OPTIONSThe programs follow the usual GNU command line syntax, with long options starting with two dashes (`-'). A summary of options are included below. For a complete description, see the other documentation.
c2hs accepts the following options:
- -h, -?, --help
- brief help
- -v, --version
- show version information
- show version number
- -c CPP, --cpp=CPP
- use executable CPP to invoke C preprocessor
- -C CPPOPTS, --cppopts=CPPOPTS
- pass CPPOPTS to the C preprocessor
- -o FILE, --output=FILE
- output result to FILE (should end in .hs)
- -t PATH, --output-dir=PATH
- place generated files in PATH
- -p PLATFORM, --platform=PLATFORM
- platform to use for cross compilation
- -k, --keep
- keep pre-processed C header
- -l, --copy-library
- copy `C2HS' library module to the current directory
- -d TYPE, --dump=TYPE
dump internal information (for debugging), where TYPE is one of:
- • trace
- trace compiler phases
- • genbind
- trace binding generation
- • ctrav
- trace C declaration traversal
- • chs
- dump the binding file (adds .dump to the name)
header-file is the header file belonging to the marshalled library. It must end with suffix .h.
binding-file is the corresponding Haskell binding file, which must end with suffix .chs.
PLATFORM The platform name can be one of: x86_64-linux. i686-linux. m68k-palmos. This allows for cross-compilation, assuming the rest of your toolchain supports that. The default is the current host platform.
The most useful of these options is probably --cppopts (or -C). If the C header file needs any special options (like -D or -I) to go through the C pre-processor, here is the place to pass them.
The easiest way to use the C->Haskell Interface Generator is via Cabal. Cabal knows about .chs files and will run c2hs automatically, passing the appropriate flags.
When used directly, c2hs is usually called as:
c2hs lib.h Lib.chs
where lib.h is the header file and Lib.chs the Haskell binding module, which define the C- and Haskell-side interface, respectively. If no errors occur, the result is a pure Haskell module Lib.hs, which implements the Haskell API of the library.
A more advanced call may look like this:
c2hs --cppopts=-I/some/obscure/dir --cppopts=-DEXTRA lib.h Lib.chs
Often, lib.h will not be in the current directory, but in one of the header file directories. Apart from the current directory, C->Haskell looks in two places for the header: first, in the standard include directory of the used system, this is usually /usr/include and /usr/local/include; and second, it will look in every directory that is mentioned in a -IDIR option passed to the pre-processor via --cppopts.
CAVEATSIf you have more than one option that you want to give to the pre-processor, use multiple --cppopts= flags.
Please report bugs and feature requests in the c2hs trac
or to the C->Haskell mailing list [email protected]
COPYRIGHTC->Haskell Version 0.15.1 Copyright (c) [1999..2007] Manuel M. T. Chakravarty <[email protected]>
AUTHORThis manual page was mainly assembled from the original documentation.
It was written by Michael Weber <[email protected]> for the Debian GNU/Linux system (but may be used by others).