dnl Process this file with autoconf to produce a configure script.

AC_INIT(ginac/basic.cpp)
AC_PREREQ(2.12)

dnl Configure options
AC_ARG_ENABLE(html-doc, [  --enable-help-doc       build HTML documentation [default=yes]], , enable_html_doc=yes)
AC_ARG_ENABLE(ps-doc,   [  --enable-ps-doc         build PostScript documentation [default=no]], , enable_ps_doc=no)

dnl GiNaC version information
dnl
dnl Making releases:
dnl   GINACLIB_MICRO_VERSION += 1;
dnl   GINACLIB_INTERFACE_AGE += 1;
dnl   GINACLIB_BINARY_AGE += 1;
dnl if any functions have been added, set GINACLIB_INTERFACE_AGE to 0.
dnl if backwards compatibility has been broken,
dnl set GINACLIB_BINARY_AGE and GINACLIB_INTERFACE_AGE to 0.
dnl
dnl NOTE: these can't be renamed to GINAC_MAJOR_VERSION etc. because
dnl autoconf sees "AC_MAJOR_VERSION" and complains about an undefined macro
dnl (don't we all *love* autoconf?)...

GINACLIB_MAJOR_VERSION=0
GINACLIB_MINOR_VERSION=4
GINACLIB_MICRO_VERSION=0
GINACLIB_INTERFACE_AGE=0
GINACLIB_BINARY_AGE=0
GINACLIB_VERSION=$GINACLIB_MAJOR_VERSION.$GINACLIB_MINOR_VERSION.$GINACLIB_MICRO_VERSION

AC_SUBST(GINACLIB_MAJOR_VERSION)
AC_SUBST(GINACLIB_MINOR_VERSION)
AC_SUBST(GINACLIB_MICRO_VERSION)
AC_SUBST(GINACLIB_INTERFACE_AGE)
AC_SUBST(GINACLIB_BINARY_AGE)
AC_SUBST(GINACLIB_VERSION)

dnl libtool versioning
LT_RELEASE=$GINACLIB_MAJOR_VERSION.$GINACLIB_MINOR_VERSION
LT_CURRENT=`expr $GINACLIB_MICRO_VERSION - $GINACLIB_INTERFACE_AGE`
LT_REVISION=$GINACLIB_INTERFACE_AGE
LT_AGE=`expr $GINACLIB_BINARY_AGE - $GINACLIB_INTERFACE_AGE`

AC_SUBST(LT_RELEASE)
AC_SUBST(LT_CURRENT)
AC_SUBST(LT_REVISION)
AC_SUBST(LT_AGE)

dnl This defines PACKAGE and VERSION
AM_CONFIG_HEADER(config.h)
AM_INIT_AUTOMAKE([GiNaC], $GINACLIB_VERSION)
AM_MAINTAINER_MODE

dnl ===========================================================================
dnl Check for the compiler and all the utilities needed for the build:
dnl ===========================================================================
AC_PROG_CXX
AC_PROG_CXXCPP
AM_PROG_INSTALL
AM_PROG_LIBTOOL
AM_PROG_LEX
AC_PROG_YACC

dnl Check for data types which are needed by the hash function (golden_ratio_hash)
AC_CHECK_SIZEOF(long, 4)
AC_CHECK_SIZEOF(long long, 8)
AC_CHECK_SIZEOF(long double, 12)

dnl Switch to C++ language mode for the following libraries and headers:
AC_LANG_CPLUSPLUS

dnl Check for stuff needed for building the GiNaC interactive shell (ginsh):
AC_CHECK_HEADERS(unistd.h)
AC_CHECK_HEADERS(readline/readline.h readline/history.h)
save_LIBS=$LIBS
AC_CHECK_LIB(readline, readline)
GINSH_LIBS=$LIBS
LIBS=$save_LIBS
AC_SUBST(GINSH_LIBS)

dnl Make sure the following libraries work by testing for symbols therein. 
dnl They are automatically added the the variable $LIBS and thus passed into
dnl the Makefile:
AC_CHECK_LIB(stdc++, cout)

dnl Make sure all the necessary new-style headers are installed on the system.
dnl If one of them cannot be found the system is probably not ANSI-conform
dnl enough so trying the .h-style headers is a waste of time.
AC_CHECK_HEADERS(iostream vector map string list typeinfo iterator strstream stdexcept algorithm, ,
    AC_MSG_ERROR(need to have ANSI compliant headers))

dnl We need to have Bruno Haible's CLN installed (macros are in acinclude.m4):
GINAC_CHECK_CLN_H
GINAC_CHECK_LIBCLN

dnl Check for utilities needed by the different kinds of documentation.
dnl Documantation needs only be built when extending it, so never mind if it
dnl cannot find those helpers:
AC_PATH_PROG(DOXYGEN, doxygen, "")
AC_PATH_PROG(JADE, jade, "")
AC_PATH_PROG(JADETEX, jadetex, "")
AC_PATH_PROG(LATEX, latex, "")
AC_PATH_PROG(MAKEINDEX, makeindex, "")
AC_PATH_PROG(DVIPS, dvips, "")
AC_PATH_PROG(FIG2DEV, fig2dev, "")

dnl Determine which documentation shall be built
TUTORIAL_TARGETS=
REFERENCE_TARGETS=
if [[ "x$enable_html_doc" = "xyes" ]]; then
  TUTORIAL_TARGETS="$TUTORIAL_TARGETS index.html"
  REFERENCE_TARGETS="$REFERENCE_TARGETS index.html"
fi
if [[ "x$enable_ps_doc" = "xyes" ]]; then
# currently doesn't work
#  TUTORIAL_TARGETS="$TUTORIAL_TARGETS tutorial.ps"
  REFERENCE_TARGETS="$REFERENCE_TARGETS reference.ps"
fi
AC_SUBST(TUTORIAL_TARGETS)
AC_SUBST(REFERENCE_TARGETS)

dnl ===========================================================================
dnl Produce a Makefile from Makefile.in:
dnl ===========================================================================
AC_OUTPUT([
Makefile
GiNaC.spec
ginac/Makefile
check/Makefile
ginsh/Makefile
doc/Makefile
doc/tutorial/Makefile
doc/reference/Makefile
])
echo "Configuration done. Now type \"make\"."