## Autoconf macros for working with Guile.

##

##   Copyright (C) 1998, 2001, 2006, 2010, 2012 Free Software

##   Foundation, Inc.

##

## This library is free software; you can redistribute it and/or

## modify it under the terms of the GNU Lesser General Public

## License as published by the Free Software Foundation; either

## version 2.1 of the License, or (at your option) any later version.

## 

## This library is distributed in the hope that it will be useful,

## but WITHOUT ANY WARRANTY; without even the implied warranty of

## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU

## Lesser General Public License for more details.

## 

## You should have received a copy of the GNU Lesser General Public

## License along with this library; if not, write to the Free Software

## Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA

## Index

## -----

##

## GUILE_PROGS -- set paths to Guile interpreter, config and tool programs

## GUILE_FLAGS -- set flags for compiling and linking with Guile

## GUILE_SITE_DIR -- find path to Guile "site" directory

## GUILE_CHECK -- evaluate Guile Scheme code and capture the return value

## GUILE_MODULE_CHECK -- check feature of a Guile Scheme module

## GUILE_MODULE_AVAILABLE -- check availability of a Guile Scheme module

## GUILE_MODULE_REQUIRED -- fail if a Guile Scheme module is unavailable

## GUILE_MODULE_EXPORTS -- check if a module exports a variable

## GUILE_MODULE_REQUIRED_EXPORT -- fail if a module doesn't export a variable

## Code

## ----

## NOTE: Comments preceding an AC_DEFUN (starting from "Usage:") are massaged

## into doc/ref/autoconf-macros.texi (see Makefile.am in that directory).

# GUILE_PROGS -- set paths to Guile interpreter, config and tool programs

#

# Usage: GUILE_PROGS

#

# This macro looks for programs @code{guile}, @code{guile-config} and

# @code{guile-tools}, and sets variables @var{GUILE}, @var{GUILE_CONFIG} and

# @var{GUILE_TOOLS}, to their paths, respectively.  If either of the first two

# is not found, signal error.

#

# The variables are marked for substitution, as by @code{AC_SUBST}.

#

AC_DEFUN([GUILE_PROGS],

 [AC_PATH_PROG(GUILE,guile)

  if test "$GUILE" = "" ; then

      AC_MSG_ERROR([guile required but not found])

  fi

  AC_SUBST(GUILE)

  AC_PATH_PROG(GUILE_CONFIG,guile-config)

  if test "$GUILE_CONFIG" = "" ; then

      AC_MSG_ERROR([guile-config required but not found])

  fi

  AC_SUBST(GUILE_CONFIG)

  AC_PATH_PROG(GUILE_TOOLS,guile-tools)

  AC_SUBST(GUILE_TOOLS)

 ])

# GUILE_FLAGS -- set flags for compiling and linking with Guile

#

# Usage: GUILE_FLAGS

#

# This macro runs the @code{guile-config} script, installed with Guile, to

# find out where Guile's header files and libraries are installed.  It sets

# two variables, @var{GUILE_CFLAGS} and @var{GUILE_LDFLAGS}.

#

# @var{GUILE_CFLAGS}: flags to pass to a C or C++ compiler to build code that

# uses Guile header files.  This is almost always just a @code{-I} flag.

#

# @var{GUILE_LDFLAGS}: flags to pass to the linker to link a program against

# Guile.  This includes @code{-lguile} for the Guile library itself, any

# libraries that Guile itself requires (like -lqthreads), and so on.  It may

# also include a @code{-L} flag to tell the compiler where to find the

# libraries.

#

# The variables are marked for substitution, as by @code{AC_SUBST}.

#

AC_DEFUN([GUILE_FLAGS],

 [AC_REQUIRE([GUILE_PROGS])dnl

  AC_MSG_CHECKING([libguile compile flags])

  GUILE_CFLAGS="`$GUILE_CONFIG compile`"

  AC_MSG_RESULT([$GUILE_CFLAGS])

  AC_MSG_CHECKING([libguile link flags])

  GUILE_LDFLAGS="`$GUILE_CONFIG link`"

  AC_MSG_RESULT([$GUILE_LDFLAGS])

  AC_SUBST(GUILE_CFLAGS)

  AC_SUBST(GUILE_LDFLAGS)

 ])

# GUILE_SITE_DIR -- find path to Guile "site" directory

#

# Usage: GUILE_SITE_DIR

#

# This looks for Guile's "site" directory, usually something like

# PREFIX/share/guile/site, and sets var @var{GUILE_SITE} to the path.

# Note that the var name is different from the macro name.

#

# The variable is marked for substitution, as by @code{AC_SUBST}.

#

AC_DEFUN([GUILE_SITE_DIR],

 [AC_REQUIRE([GUILE_PROGS])dnl

  AC_MSG_CHECKING(for Guile site directory)

  GUILE_SITE=`[$GUILE_CONFIG] info pkgdatadir`/site

  AC_MSG_RESULT($GUILE_SITE)

  AC_SUBST(GUILE_SITE)

 ])

# GUILE_CHECK -- evaluate Guile Scheme code and capture the return value

#

# Usage: GUILE_CHECK_RETVAL(var,check)

#

# @var{var} is a shell variable name to be set to the return value.

# @var{check} is a Guile Scheme expression, evaluated with "$GUILE -c", and

#    returning either 0 or non-#f to indicate the check passed.

#    Non-0 number or #f indicates failure.

#    Avoid using the character "#" since that confuses autoconf.

#

AC_DEFUN([GUILE_CHECK],

 [AC_REQUIRE([GUILE_PROGS])

  $GUILE -c "$2" > /dev/null 2>&1

  $1=$?

 ])

# GUILE_MODULE_CHECK -- check feature of a Guile Scheme module

#

# Usage: GUILE_MODULE_CHECK(var,module,featuretest,description)

#

# @var{var} is a shell variable name to be set to "yes" or "no".

# @var{module} is a list of symbols, like: (ice-9 common-list).

# @var{featuretest} is an expression acceptable to GUILE_CHECK, q.v.

# @var{description} is a present-tense verb phrase (passed to AC_MSG_CHECKING).

#

AC_DEFUN([GUILE_MODULE_CHECK],

         [AC_MSG_CHECKING([if $2 $4])

	  GUILE_CHECK($1,(use-modules $2) (exit ((lambda () $3))))

	  if test "$$1" = "0" ; then $1=yes ; else $1=no ; fi

          AC_MSG_RESULT($$1)

         ])

# GUILE_MODULE_AVAILABLE -- check availability of a Guile Scheme module

#

# Usage: GUILE_MODULE_AVAILABLE(var,module)

#

# @var{var} is a shell variable name to be set to "yes" or "no".

# @var{module} is a list of symbols, like: (ice-9 common-list).

#

AC_DEFUN([GUILE_MODULE_AVAILABLE],

         [GUILE_MODULE_CHECK($1,$2,0,is available)

         ])

# GUILE_MODULE_REQUIRED -- fail if a Guile Scheme module is unavailable

#

# Usage: GUILE_MODULE_REQUIRED(symlist)

#

# @var{symlist} is a list of symbols, WITHOUT surrounding parens,

# like: ice-9 common-list.

#

AC_DEFUN([GUILE_MODULE_REQUIRED],

         [GUILE_MODULE_AVAILABLE(ac_guile_module_required, ($1))

          if test "$ac_guile_module_required" = "no" ; then

              AC_MSG_ERROR([required guile module not found: ($1)])

          fi

         ])

# GUILE_MODULE_EXPORTS -- check if a module exports a variable

#

# Usage: GUILE_MODULE_EXPORTS(var,module,modvar)

#

# @var{var} is a shell variable to be set to "yes" or "no".

# @var{module} is a list of symbols, like: (ice-9 common-list).

# @var{modvar} is the Guile Scheme variable to check.

#

AC_DEFUN([GUILE_MODULE_EXPORTS],

 [GUILE_MODULE_CHECK($1,$2,$3,exports `$3')

 ])

# GUILE_MODULE_REQUIRED_EXPORT -- fail if a module doesn't export a variable

#

# Usage: GUILE_MODULE_REQUIRED_EXPORT(module,modvar)

#

# @var{module} is a list of symbols, like: (ice-9 common-list).

# @var{modvar} is the Guile Scheme variable to check.

#

AC_DEFUN([GUILE_MODULE_REQUIRED_EXPORT],

 [GUILE_MODULE_EXPORTS(guile_module_required_export,$1,$2)

  if test "$guile_module_required_export" = "no" ; then

      AC_MSG_ERROR([module $1 does not export $2; required])

  fi

 ])

## guile.m4 ends here