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findlib.conf(5) | File Formats Manual | findlib.conf(5) |
NAME¶
findlib.conf - [Configuration of findlib/ocamlfind]GENERAL¶
There are three possibilities to configure the findlib library:Build time:
Before findlib is compiled, a
"configure" script is invoked to figure out the settings that are
most likely to work on the system. Most settings are simply entered into text
files and can easily be changed after installation. The following properties
cannot be changed later because they are compiled into the resulting binaries:
The default location of the configuration file
findlib.conf. However, you can set a different location by the environment
variable OCAMLFIND_CONF.
Whether the installed O'Caml version supports
autolinking or not.
Configuration file findlib.conf:
An initial version of this file is generated
by the configure script, but you are free to modify it later. Most important,
this file contains the system-wide search path used to look up packages, and
the default location where to install new packages.
All files with the suffix ".conf" found in the directory
findlib.conf.d are also scanned for parameters.
Environment variables:
The settings of findlib.conf can be overridden
by environment variables.
Last but not least, several settings can also be passed as command-line options,
or by invoking the function Findlib.init.
findlib.conf¶
The directory containing findlib.conf is determined at build time (by running the configure script), the fallback default is /usr/local/etc. You can set a different location by changing the environment variable OCAMLFIND_CONF which must contain the absolute path of findlib.conf. The file has the same syntax as META, i.e. it consists of a number of lines with the formatvariable = " value "Here is the list of allowed variables:
path
The search path for META files/package
directories. The variable enumerates directories which are separated by colons
(Windows: semicolons), and these directories are tried in turn to find a
certain package. More exactly, if d is such a directory and p the searched
package, the search algorithm will first check whether d/p/META exists. In
this case, this META file is taken, and d/p is the package directory. Second,
the algorithm tries d/META.p, but the package directory must be specified in
this META.p file by a directory directive.
Note that the first found META file is taken, so the order of the directories in
the search path counts.
This variable is required.
Example:
path = "/usr/local/lib/ocaml/site-lib:/usr/lib/ocaml/site-lib"
destdir
This variable determines the location where
ocamlfind install puts the packages by default: If d is this directory, and p
the package to install, a new subdirectory d/p will be created containing all
the files of the package.
Example:
destdir = "/usr/local/lib/ocaml/site-lib"This variable is required.
metadir
If set, the command ocamlfind install will put
the META files of packages into this directory (files are named META.p where
p=package name); otherwise the META files are put into the package directories
like any other file.
Example:
metadir = "/var/lib/findlib/metaregistry"This variable is optional. It is not used by default.
ocamlc, ocamlopt, ocamlcp, ocamlmktop,
ocamldoc, ocamldep, ocamlbrowser
If you want to call other executables than
"ocamlc", "ocamlopt", "ocamlcp",
"ocamlmktop", "ocamldoc", "ocamldep", and
"ocamlbrowser", you can set the names of the executables here. The
command ocamlfind looks into these four variables to determine the names of
the compilers to call.
Example:
ocamlc = "ocamlc.opt"This variable is optional. It is not used by default.ocamlopt = "ocamlopt.opt"ocamlcp = "ocamlcp.opt"ocamlmktop = "ocamlmktop.opt"
stdlib
This variable determines the location of the
standard library. This must be the same directory for which the O'Caml
compilers are configured.
This variable is optional. It is not recommend to set this variable unless you
know what you are doing!
ldconf
This variable determines the location of the
ld.conf file. This must be the same file the O'Caml compilers read in; it is
updated by ocamlfind when installing and removing packages. You can set this
variable to the special value "ignore" to disable the automatic
modification of the ld.conf file.
If not set, the ld.conf file is assumed to reside in the O'Caml standard library
directory.
This variable is optional. It is not recommended to set this variable unless you
know what you are doing!
Toolchains: It is possible to have variants of the original configuration. These
variants are called "toolchains" because they are intended to select
different compilers, e.g. patched compilers. In order to set a variable for a
certain toolchain, use the syntax
variable ( toolchain ) = " value "For example:
ocamlc(mypatch) = "ocamlc-mypatch"When the toolchain "mypatch" is selected, this compiler will be used instead of the standard one. In order to switch to a certain toolchain, use the -toolchain option of ocamlfind.
Environment¶
A number of environment variables modifies the behaviour of findlib/ocamlfind:OCAMLFIND_CONF
This variable overrides the location of the
configuration file findlib.conf. It must contain the absolute path name of
this file.
OCAMLPATH
This variable may contain an additional search
path for package directories. It is treated as if the directories were
prepended to the configuration variable path.
OCAMLFIND_DESTDIR
This variable overrides the configuration
variable destdir.
OCAMLFIND_METADIR
This variable overrides the configuration
variable metadir.
OCAMLFIND_COMMANDS
This variable overrides the configuration
variables ocamlc, ocamlopt, ocamlcp, ocamlmktop, ocamldoc, ocamldep, and/or
ocamlbrowser. Its value must conform to the syntax
ocamlc= name ocamlopt= name ocamlcp= name ocamlmktop= name ocamldoc= name ocamldep= name ocamlbrowser= nameExample:
ocamlc=ocamlc-3.00 ocamlopt=ocamlopt-3.00 ocamlcp=ocamlcp-3.00 ocamlmktop=ocamlmktop-3.00
CAMLLIB or OCAMLLIB
This variable overrides the configuration
variable stdlib.
OCAMLFIND_LDCONF
This variable overrides the configuration
variable ldconf.
OCAMLFIND_IGNORE_DUPS_IN
This variable instructs findlib not to emit
warnings that packages or module occur several times. The variable must be set
to the directory where the packages reside that are to be ignored for this
warning.
The findlib package manager for OCaml | User Manual |