Ubuntu Manpage: ocaml.m4 - Autoconf macros for OCaml

Provided by: ocaml-tools_20120103-6build1_all

NAME

       ocaml.m4 - Autoconf macros for OCaml

SUMMARY

        AC_PROG_OCAML
        AC_PROG_FINDLIB
        AC_PROG_OCAMLLEX
        AC_PROG_OCAMLYACC
        AC_PROG_CAMLP4
        AC_CHECK_OCAML_PKG([name])
        AC_CHECK_OCAML_MODULE(VARIABLE,NAME,MODULE,INCLUDE-PATHS)
        AC_CHECK_OCAML_WORD_SIZE

DESCRIPTION

       ocaml.m4 is a file containing standard, useful autoconf macros for detecting the OCaml,
       findlib, OCaml packages, and so on in your autoconf-generated ./configure scripts.

       To begin using these macros, you will need to copy the "ocaml.m4" file (usually located at
       "/usr/share/aclocal/ocaml.m4") to the autoconf macros directory in your project.  Normally
       this is the "m4/" directory in your project, but the directory can be changed using the
       "AC_CONFIG_MACRO_DIR(DIR)" directive.  If you have just created the "m4/" directory, then
       you may also need to do:

        aclocal -I m4

       You can then add any of the macros described below to your "configure.ac" (or
       "configure.in"). Almost every OCaml project should use "AC_PROG_OCAML" first and probably
       "AC_PROG_FINDLIB" right after it.

       This manual page does not describe how to use autoconf.  For that you should read the
       detailed autoconf info file ("info autoconf").

AC_PROG_OCAML

This macro detects which tools of the usual OCaml toolchain are available. It defines and
substitutes the following variables:

OCAMLC set to the name of the bytecode compiler
(eg. "ocamlc" or "ocamlc.opt"), or "no" if
no OCaml installation was found
OCAMLOPT the name of the native-code compiler, eg. "ocamlopt",
"ocamlopt.opt" or "no"
OCAMLBEST "byte" (if only the bytecode compiler is available)
or "opt" (if both bytecode and native code compilers
are available)
OCAMLDEP the name of the dependency resolver, eg. "ocamldep"
OCAMLMKTOP the name of ocamlmktop
OCAMLMKLIB the name of ocamlmklib
OCAMLDOC the name of ocamldoc
OCAMLBUILD the name of ocamlbuild
OCAMLLIB the OCaml library path (eg. C</usr/lib/ocaml/>)
OCAMLVERSION the compiler version (eg. C<3.11.0>)

Detecting if OCaml is installed
Unlike old versions of these macros, "AC_PROG_OCAML" does not exit if no OCaml
installation is detected. Therefore if you want to detect if OCaml is installed you have
to do something like this:

AC_PROG_OCAML
if test "$OCAMLC" = "no"; then
AC_MSG_ERROR([You must install the OCaml compiler])
fi

This behaviour and usage pattern are consistent with other macros of the "AC_PROG_*")
family.

Cross-compiling
If the configure script is invoked for cross-compiling then "AC_PROG_OCAML" will detect
the cross-compiler versions of the OCaml compiler, eg. "OCAMLC=i686-pc-mingw32-ocamlc"
etc. This happens automatically, and for most purposes you don't need to worry about it.

AC_PROG_FINDLIB

       This macro checks for the presence of the ocamlfind program (part of findlib).  It defines
       and substitutes "OCAMLFIND" to the name of the ocamlfind program, or "no" if not found.

       Note that this macro does not fail if ocamlfind is not found.  If you want to force the
       user to install findlib, you should do:

        AC_PROG_FINDLIB
        if test "$OCAMLFIND" = "no"; then
          AC_MSG_ERROR([You must install OCaml findlib (the ocamlfind command)])
        fi

       See also "AC_CHECK_OCAML_PKG".

AC_PROG_OCAMLLEX

       This checks for the ocamllex program and sets "OCAMLLEX" to the name of the program (eg.
       "ocamllex" or "ocamllex.opt"), or "no" if not found.

AC_PROG_OCAMLYACC

       This checks for the ocamlyacc program and sets "OCAMLYACC" to the name of the program, or
       "no" if not found.

AC_PROG_CAMLP4

       This checks for camlp4, and checks that the version matches the compiler version found
       previously.  It sets "CAMLP4" to the name of the basic camlp4 program, or "no" if not
       found.

       The macro also checks for other tools of the camlp4 suite like camlp4o, camlp4orf, etc.
       For each of them, a fully capitalized variable is set to the tool name (or "no" if not
       found); all variable are substituted for when filling .in files. The full list of tools
       and respective variable names is as follows:

        camlp4        CAMLP4
        camlp4boot    CAMLP4BOOT
        camlp4o       CAMLP4O
        camlp4of      CAMLP4OF
        camlp4oof     CAMLP4OOF
        camlp4orf     CAMLP4ORF
        camlp4prof    CAMLP4PROF
        camlp4r       CAMLP4R
        camlp4rf      CAMLP4RF

AC_CHECK_OCAML_PKG

       This is the main macro that can be used to detect the presence of OCaml findlib packages.
       This macro uses ocamlfind to look up findlib packages (and thus requires that findlib
       itself has been installed, and that the package has been properly packaged with a META
       file etc.)  If you want to find an OCaml findlib package which hasn't been installed with
       findlib then you should try using "AC_CHECK_OCAML_MODULE" instead.

        AC_CHECK_OCAML_PKG([name])

       checks for an OCaml findlib package with the given name. If found, it defines and
       substitutes the variable "OCAML_PKG_name" where the "name" part is substituted for the
       package name by replacing all dashes with underscores.

       For example,

        AC_CHECK_OCAML_PKG([xml-light])

       will set "OCAML_PKG_xml_light" to either "xml-light" or "no".

       To have the configure script fail if a package is not installed, do:

        AC_CHECK_OCAML_PKG([foo])
        if test "$OCAML_PKG_foo" = "no"; then
          AC_MSG_ERROR([Please install OCaml findlib module 'foo'.])
        fi

       In your Makefile.in, use the substitution variable in conjunction with ocamlfind, eg:

        .ml.cmo:
          $(OCAMLFIND) ocamlc -package @OCAML_PKG_foo@ -c $< -o $@

       Note that also in the substitution variable dashes are replaced with underscores.

   Checking for alternative findlib package names
       In the (unlikely) case where the same library corresponds to different findlib package
       names on different systems, you can improve portability by checking for the alternative
       names passing a second argument to "AC_CHECK_OCAML_PKG":

        AC_CHECK_OCAML_PKG(PKGNAME,ALTERNATIVE-NAMES)

       The behaviour is the same as before if "PKGNAME" is found. Otherwise all names in
       "ALTERNATIVE-NAMES" are tested in turn as findlib package names. If one is found, it is
       set as the value set by the macro and substituted in .in files; otherwise "no" is set.

       Note that the variable name is determined by "PKGNAME", while the value depends on the
       actual alternative name found.

       For example, to detect the camlzip findlib package, either called "zip" or "camlzip", and
       to store the found value in the "OCAML_PKG_zip" variable you can do in your configure.ac:

        AC_CHECK_OCAML_PKG(zip,camlzip)

       and have a portable Makefile.in build line such as:

        .ml.cmo:
          $(OCAMLFIND) ocamlc -package @OCAML_PKG_zip@ -c $< -o $@

AC_CHECK_OCAML_MODULE(VARIABLE,NAME,MODULE,INCLUDE-PATHS)

"AC_CHECK_OCAML_MODULE" is the hairier alternative to "AC_CHECK_OCAML_PKG". You should
always use "AC_CHECK_OCAML_PKG" and ocamlfind/findlib if possible.

The parameters are:

VARIABLE
This is the environment variable that is set. It will either be set to the include
path, or to "no" if the module was not found.

NAME
This is the name of the module we are looking for. This parameter is just used for
printing messages, and does not affect how the module is found.

MODULE
This should be an OCaml module name, representing the module name being looked up.
You can put sub-modules here, eg. "CalendarLib.Date"

INCLUDE-PATHS
This is the default list of include directories to search, eg. "+calendar"

For example, the following code will check for the OCaml Calendar module, and will
distinguish between version 1 and version 2 of this module (which have incompatible APIs).

AC_CHECK_OCAML_PKG(calendar)
AC_CHECK_OCAML_MODULE(is_calendar2,calendar,[CalendarLib.Date],[+calendar])

After the above code has run, variables "OCAML_PKG_calendar" and "is_calendar2" will be
set as follows:

OCAML_PKG_calendar is_calendar2 Result

yes +calendar Calendar v2 is installed
yes no Calendar v1 is installed
no no No Calendar module installed

AC_CHECK_OCAML_WORD_SIZE

       This checks the word size of the OCaml compiler, and sets "OCAML_WORD_SIZE" to either 32
       or 64.

FILES

       •   /usr/share/aclocal/ocaml.m4

AUTHORS

       Various people have contributed to these macros over many years:

       •   Olivier Andrieu

       •   Jean-Christophe Filliatre

       •   Richard W.M. Jones

       •   Georges Mariano

       •   Jim Meyering

       •   Stefano Zacchiroli

LICENSE

        Copyright X 2009      Richard W.M. Jones
        Copyright X 2009      Stefano Zacchiroli
        Copyright X 2000-2005 Olivier Andrieu
        Copyright X 2000-2005 Jean-Christophe Filliatre
        Copyright X 2000-2005 Georges Mariano

        All rights reserved.

        Redistribution and use in source and binary forms, with or without modification,
        are permitted provided that the following conditions are met:

        * Redistributions of source code must retain the above copyright notice, this
        list of conditions and the following disclaimer.
        * Redistributions in binary form must reproduce the above copyright notice,
        this list of conditions and the following disclaimer in the documentation
        and/or other materials provided with the distribution.
        * The names of the contributors may not be used to endorse or promote
        products derived from this software without specific prior written
        permission.

        THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ''AS IS'' AND ANY
        EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
        WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
        DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE FOR ANY
        DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
        (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
        LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
        ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
        (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
        SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

REPORTING BUGS

       Please report bugs to the authors at the project page:
       <http://forge.ocamlcore.org/projects/ocaml-autoconf/>, using the forge bug tracker
       <http://forge.ocamlcore.org/tracker/?group_id=69>.