C-haskell interface generator
c2hs [OPTIONS]... header-file binding-file
This 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.
The 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
--numeric-version
show version number
-cCPP,--cpp=CPP
use executable CPP to invoke C preprocessor
-CCPPOPTS,--cppopts=CPPOPTS
pass CPPOPTS to the C preprocessor
-oFILE,--output=FILE
output result to FILE (should end in .hs)
-tPATH,--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
-dTYPE,--dump=TYPE
dump internal information (for debugging), where TYPE is one of:
trace compiler phases
trace binding generation
trace C declaration traversal
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.
If you have more than one option that you want to give to the pre-processor, use multiple --cppopts=flags.
User guide /usr/share/doc/c2hs-0.15.1/html/c2hs.html
Home page http://www.cse.unsw.edu.au/~chak/haskell/c2hs/
Please report bugs and feature requests in the c2hs trac
http://hackage.haskell.org/trac/c2hs/
or to the C->Haskell mailing list [email protected]
C->Haskell Version 0.15.1 Copyright (c) [1999..2007] Manuel M. T. Chakravarty <[email protected]>
This 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).