#                                               -*- Autoconf -*-
# Process this file with autoconf to produce a configure script.

AC_PREREQ(2.59)
AC_INIT([ElectronicStructurePACKage], 1.1, heber@ins.uni-bonn.de, ESPACK)
AC_CONFIG_AUX_DIR([config])
AC_CONFIG_SRCDIR([src/pcp.c])
AC_CONFIG_HEADER([config.h])

AM_INIT_AUTOMAKE(dist-bzip2)

AC_CANONICAL_HOST

# Checks for programs.
AC_PROG_CC
AC_PROG_CXX
AC_PATH_PROG([PERL],[perl])
AC_PATH_PROG([TAR],[tar])
AM_MISSING_PROG([DOXYGEN], [doxygen])

dnl Check for MPI-Routines
AC_ARG_ENABLE([mpi],
              AS_HELP_STRING([--enable-mpi],[build MPI parallel version (default is yes if MPI code can be compiled)]),
              [enable_mpi=$enableval], [enable_mpi=maybe])
disabled_msg="MPI version disabled."
if test x"$enable_mpi" = xyes -o x"$enable_mpi" = xmaybe
then
        AC_MSG_NOTICE([checking for MPI features])
        ACX_MPI([enable_mpi=yes
		 CC=mpicc
		 CXX=mpicxx],
                [err_msg="cannot find out how to compile MPI code."
                 if test x"$enable_mpi" = xyes
                 then
                         AC_MSG_ERROR([$err_msg])
                 else
                         AC_MSG_WARN([$err_msg $disabled_msg])
                         enable_mpi=no
                 fi])
else
        AC_MSG_NOTICE([$disabled_msg])
fi
#AC_ARG_VAR([MPILIBS],[necessary libraries to link MPI C code])
AM_CONDITIONAL([MPIVER], [test x"$enable_mpi" = xyes])

# Checks for typedefs, structures, and compiler characteristics.
AC_TYPE_PID_T
AC_TYPE_SIZE_T
AC_TYPE_SIGNAL

AC_C_CONST
AC_C_INLINE
AC_C_VOLATILE
AC_C_RESTRICT

# Checks for library functions.
# use when adapted: AC_CHECK_FUNCS([floor ftruncate memmove memset mkdir modf pow realpath sqrt strchr strdup strerror strrchr strstr strtol statfs],[],[AC_MSG_WARN([Some functions not found.  Compile may fail.  Alternate methods may need to be implemented.])])
AC_FUNC_MALLOC
AC_FUNC_REALLOC
AC_TYPE_SIGNAL

# Checks for fftw libraries and find out version.
AC_CHECK_LIB(m, sqrt, ,AC_MSG_ERROR([compatible libc math library not found]))
AC_CHECK_FUNCS([alarm atexit floor pow sqrt strchr uname strstr strrchr])
FFTW=notfound
RFFTW=notfound
AC_ARG_ENABLE([fftw],
              AS_HELP_STRING([--enable-fftw],[build FFTW-2 version (default is yes if fftw2 code can be compiled)]),
              [enable_fftw=$enableval], [enable_fftw=maybe])
AC_ARG_ENABLE([dfftw],
              AS_HELP_STRING([--enable-dfftw],[build double fftw2 version (default is fftw2)]),
              [enable_dfftw=$enableval], [enable_dfftw=maybe])
AC_ARG_ENABLE([fftw3],
              AS_HELP_STRING([--enable-fftw3],[build FFTW-3 version (default is fftw2)]),
              [enable_fftw3=$enableval], [enable_fftw3=maybe])
              
# debugging info
AC_ARG_ENABLE([debug],AS_HELP_STRING([--enable-debug],[Output debugging information (default is no)]),
              [enable_debug=$enableval], [enable_debug=maybe])
if test x"$enable_debug" = xyes; then
  AC_DEFINE(HAVE_DEBUG,1, ["Output debugging info"])
  AC_SUBST(HAVE_DEBUG)
fi

# add replacement/saturation hydrogen or not 
AC_ARG_ENABLE([hydrogen],AS_HELP_STRING([--enable-hydrogen],[Adding saturation hydrogen (default is yes)]),
              [enable_hydrogen=$enableval], [enable_hydrogen=yes])
if test x"$enable_hydrogen" = xyes; then
  AC_DEFINE(ADDHYDROGEN,1, ["Adding saturation hydrogen"])
  AC_SUBST(ADDHYDROGEN)
fi

# Checks for header files.
AC_HEADER_STDC
AC_CHECK_HEADERS([sys/time.h unistd.h float.h stddef.h])
AC_HEADER_STDBOOL

# check for fftw headers and subsequently for libs
# if FFTW=.. set on success condition, -l... is not appended
# .._HEADER doesn't show up in configh.h, .._HEADERS does!
FFTW=notfound
if test x"$FFTW" = xnotfound -o x"$enable_fftw" = xyes; then
	FFTW=FFTW
	AC_CHECK_HEADERS(fftw.h,
		[AC_CHECK_LIB(fftw, fftw_create_plan, , [FFTW=notfound], -lfftw)],
		[FFTW=notfound]
		)
	
	AC_CHECK_HEADERS(rfftw.h,
		[AC_CHECK_LIB(rfftw, rfftw_create_plan, , [FFTW=notfound],-lrfftw)],
		[FFTW=notfound]
	)
fi
if test x"$FFTW" = xnotfound -o x"$enable_dfftw" = xyes; then
	FFTW=DFFTW
	AC_CHECK_HEADERS(dfftw.h,
		[AC_CHECK_LIB(dfftw, fftw_create_plan, , [FFTW=notfound],-ldfftw)],
		[FFTW=notfound]
		)
	
	AC_CHECK_HEADERS(drfftw.h,
		[AC_CHECK_LIB(drfftw, rfftw_create_plan, , [FFTW=notfound],-ldrfftw)],
		[FFTW=notfound]
	)
fi
if test x"$FFTW" = xnotfound -o x"$enable_fftw3" = xyes; then
	FFTW=FFTW3
	AC_CHECK_HEADERS(fftw3.h,
		[AC_CHECK_LIB(fftw3, fftw_create_plan, , [FFTW=notfound],-lfftw3)],
		[FFTW=notfound]
		)
fi
# warn if not found
if test x"$FFTW" = xnotfound; then
	AC_MSG_WARN(["Missing lib(d)fftw(3) and/or lib(d)rfftw(3).\nIf exist but not in LD_.._PATH, use export LDFLAGS=-L.."])
	AC_MSG_WARN(["Or missing header (d)fftw(3).h and/or (d)rfftw.h\nIf exist but not in PATH, use export CFLAGS=-I.."])
fi
# check for GNU Scientific Library
#AC_CHECK_LIB(m,main)
AC_CHECK_LIB(gslcblas,main)
AC_CHECK_LIB(gsl,main)

dnl Check for "extern inline", using a modified version
dnl of the test for AC_C_INLINE from acspecific.mt
dnl
AC_CACHE_CHECK([for extern inline], ac_cv_c_extern_inline,
[ac_cv_c_extern_inline=no
AC_TRY_COMPILE([extern $ac_cv_c_inline double foo(double x);
extern $ac_cv_c_inline double foo(double x) { return x+1.0; };
double foo (double x) { return x + 1.0; };], 
[  foo(1.0)  ],
[ac_cv_c_extern_inline="yes"])
])

if test "$ac_cv_c_inline" != no ; then
  AC_DEFINE(HAVE_INLINE,1, ["May use inline routines"])
  AC_SUBST(HAVE_INLINE)
fi

AC_CONFIG_FILES([Makefile src/Makefile doc/Makefile])
AC_OUTPUT