This is the command c2hs that can be run in the OnWorks free hosting provider using one of our multiple free online workstations such as Ubuntu Online, Fedora Online, Windows online emulator or MAC OS online emulator
PROGRAM:
NAME
c2hs - C->Haskell Interface Generator
SYNOPSIS
c2hs [OPTIONS]... header-file binding-file
DESCRIPTION
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.
OPTIONS
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
-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.
EXAMPLES
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.
CAVEATS
If you have more than one option that you want to give to the pre-processor, use multiple
--cppopts= flags.
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