AC_PREREQ([2.61])
AC_INIT([PvFMM],[1.0.0],[dmalhotra@ices.utexas.edu])

AC_CONFIG_MACRO_DIR([m4])
AC_CONFIG_AUX_DIR([build-aux])
AM_INIT_AUTOMAKE([-Wall no-define])

AC_CONFIG_SRCDIR([src/tree_node.cpp])
AM_CONFIG_HEADER([config.h])               # prep config.h from config.h.in
AX_PREFIX_CONFIG_H([include/pvfmm_config.h]) # prep include/pvfmm_config.h from it..


# Set language to C++
AC_LANG([C++])


# Checks for programs.
AX_PROG_CXX_MPI(,[CXX=$MPICXX],[])
AX_MPI([CXX=$MPICXX; CC=$MPICXX; CFLAGS=$CXXFLAGS],
       [AC_MSG_ERROR([Cannot find mpicxx. Make sure that MPI is installed and location of compiler is in PATH.])])
AX_COMPILER_VENDOR
AC_PROG_AWK
AC_PROG_F77
AC_PROG_INSTALL
AC_PROG_MKDIR_P
AC_PROG_LN_S
AC_PROG_MAKE_SET
#AC_PROG_RANLIB
##AM_PROG_AR

# automake 1.12 seems to require AM_PROG_AR, but automake 1.11 doesn't
# recognize it
m4_ifdef([AM_PROG_AR], [AM_PROG_AR])
LT_INIT
AC_PROG_LIBTOOL

# Check for CUDA
AX_CHECK_CUDA

# Checks for documentation build tools
AC_CHECK_PROG([doxygen_ok], [doxygen], [yes], [no])
AC_CHECK_PROG([pdflatex_ok], [pdflatex], [yes], [no])
AC_CHECK_PROG([latex_ok], [latex], [yes], [no])
AC_CHECK_PROG([dvips_ok], [dvips], [yes], [no])
AC_CHECK_PROG([gs_ok], [gs], [yes], [no])
if test "x$enable_html_doc" != xno; then
  test "x$doxygen_ok" != xyes && enable_html_doc=no
  test "x$latex_ok" != xyes && enable_html_doc=no
  test "x$dvips_ok" != xyes && enable_html_doc=no
  test "x$gs_ok" != xyes && enable_html_doc=no
  AC_PATH_PROG([PERL], [perl], [])
fi
AM_CONDITIONAL([LATEX_OK], [test "x$latex_ok" = xyes])
AM_CONDITIONAL([PDFLATEX_OK], [test "x$pdflatex_ok" = xyes])
AM_CONDITIONAL([HTML_DOC], [test "x$enable_html_doc" = xyes])
AM_CONDITIONAL([DOXYGEN_OK], [test "x$doxygen_ok" = xyes])

DX_HTML_FEATURE(ON)
DX_CHM_FEATURE(OFF)
DX_CHI_FEATURE(OFF)
DX_MAN_FEATURE(OFF)
DX_RTF_FEATURE(OFF)
DX_XML_FEATURE(OFF)
DX_PDF_FEATURE(OFF)
DX_PS_FEATURE(OFF)
DX_INIT_DOXYGEN($PACKAGE_NAME, Doxyfile, doc/doxygen)


AX_CXX_DEF_TEMPLATE_ARG
CHECK_QUAD_PRECISION

# Check for math libs
AC_CHECK_LIB([m],[cos])
AC_CHECK_LIB([imf],[cos])

# Check for X11
AC_PATH_X
if test "$no_x" = yes; then
  AC_MSG_WARN([Cannot find X Window System include files and libraries.
               Please specify their location using --x-includes=dir and --x-libraries=dir])
else
  if test "$x_includes" != ""; then
    X_INCLUDES="-I$x_includes"
  fi
  if test "$x_libraries" != ""; then
    X_LIBS="-L$x_libraries"
  fi
  X_LIBS="$X_LIBS -lX11"
  AC_SUBST(X_INCLUDES)
  AC_SUBST(X_LIBS)
fi

# Check for libstdc++, libdl
AC_CHECK_LIB(stdc++,main)
AC_CHECK_LIB(dl,dlopen)

# Check for OpenMP
AC_LANG_WERROR([on])
if $USE_OPENMP; then
  AC_ARG_WITH(openmp_flag,
	      [AS_HELP_STRING([--with-openmp-flag="FLAGS"],
			      [FLAGS to enable OpenMP])],
	      [OPENMP_FLAG="-$withval"],
	      [OPENMP_FLAG=""])

  # Check if OpenMP flag is already specified.
  CHECK_OPENMP($OPENMP_FLAG)

  # Check for all common OpenMP flags.
  if test "$cv_openmp" = no; then
    case "$ax_cv_cxx_compiler_vendor" in
      gnu)
      CHECK_OPENMP(-fopenmp)
      ;;
      intel)
      CHECK_OPENMP(-openmp)
      ;;
      pgi)
      CHECK_OPENMP(-mp)
      ;;
      msdosmsvc)
      ## FIXME is this the right flag for MSVC?
      CHECK_OPENMP(-openmp)
      ;;
      ## Add other compilers supporting OpenMP here
    esac
  fi

  # Error: OpenMP not available.
  if test "$cv_openmp" = no; then
    AC_MSG_ERROR([Don't know how to enable OpenMP. 
		  Please specify the OpenMP flag using: --with-openmp-flag=<flag>.]);
  fi
fi
AC_LANG_WERROR([off])

# Check for Intel Xeon Phi
CHECK_INTEL_OFFLOAD

# Check for FFTW
AC_CHECK_FFTW
AC_CHECK_FFTWF


#Check for BLAS LAPACK
#AM_CONDITIONAL(BLAS_EQ_MKL, test "$BLAS" = "MKL")
#AM_CONDITIONAL(BLAS_EQ_GSL, test "$BLAS" = "GSL")
#if (test -r $PETSC_DIR/$PETSC_ARCH/conf/petscvariables) ; then
#  PETSC_BLASLAPACK_LIB=`grep "BLASLAPACK_LIB" $PETSC_DIR/$PETSC_ARCH/conf/petscvariables | sed -e 's/.*BLASLAPACK_LIB = //'`
#  if test "x$PETSC_BLASLAPACK_LIB" != x ; then
#    if test "x$with_blas" != "x" -a "$with_blas" != "$PETSC_BLASLAPACK_LIB" ; then
#      AC_MSG_WARN([BLAS flags specified by --with-blas appear to disagree with PETSc BLAS/LAPACK flags; using PETSc settings])
#    fi
#    if test "x$with_lapack" != "x" -a "$with_lapack" != "$PETSC_BLASLAPACK_LIB" ; then
#      AC_MSG_WARN([LAPACK flags specified by --with-lapack appear to disagree with PETSc BLAS/LAPACK flags; using PETSc settings])
#    fi
#    echo "using PETSc BLAS/LAPACK library flags: $PETSC_BLASLAPACK_LIB"
#    with_blas="$PETSC_BLASLAPACK_LIB"
#    with_lapack=""
#  fi
#  PETSC_BLASLAPACK_INCLUDE=`grep "BLASLAPACK_INCLUDE" $PETSC_DIR/$PETSC_ARCH/conf/petscvariables | sed -e 's/.*BLASLAPACK_INCLUDE = //'`
#  if test "x$PETSC_BLASLAPACK_INCLUDE" != x ; then
#    CPPFLAGS="${PETSC_BLASLAPACK_INCLUDE} $CPPFLAGS"
#  fi
#fi
AX_BLAS(acx_blas_ok=yes, AC_MSG_ERROR([Cannot find BLAS library.
                    Please specify the location of the library using: --with-blas=LIB]))
AX_LAPACK(acx_lapack_ok=yes, AC_MSG_ERROR([Cannot find LAPACK library.
                    Please specify the location of the library using: --with-lapack=LIB]))
AC_SUBST(LAPACK_LIBS)
AC_SUBST(BLAS_LIBS)
AC_SUBST(FLIBS)


# Checks for header files.
AC_CHECK_HEADERS([stdint.h cstdlib cstddef])


# Checks for typedefs, structures, and compiler characteristics.
AC_HEADER_STDBOOL
AC_HEADER_STAT
AC_C_INLINE
AC_TYPE_INT32_T
AC_TYPE_UINT16_T
AC_TYPE_UINT8_T
AC_TYPE_SIZE_T


# Checks for library functions.
AC_FUNC_ERROR_AT_LINE
AC_FUNC_MALLOC
AC_FUNC_STRTOD
AC_CHECK_FUNCS([floor memset pow sqrt strtol strtoul])

# Path for precomputed data files.
AC_ARG_WITH(precomp-dir,
            [AS_HELP_STRING([--with-precomp-dir=DIR], [set directory for precomputed data files to DIR])],
            [PRECOMP_DIR="$withval"; AX_NORMALIZE_PATH([PRECOMP_DIR], ["/"]) ])
AC_DEFINE_UNQUOTED(PRECOMP_DATA_PATH,"$PRECOMP_DIR",[Path for precomputed data files.])

#AC_CONFIG_FILES([Makefile doc/doc/Makefile])
AC_CONFIG_FILES([Makefile
                 MakeVariables
                 doc/doc/Makefile])
AC_OUTPUT

echo "
------------------------------------------------------------------------------
$PACKAGE-$VERSION library configuration:
------------------------------------------------------------------------------

External libs:
  - BLAS ........... : ${acx_blas_ok}
  - LAPACK ......... : ${acx_lapack_ok}
  - FFTW ........... : ${acx_fftw_ok}

Compiler/linker flags/libs/defs:
  - MPICXX ......... : ${MPICXX}
  - CXXFLAGS ....... : ${CXXFLAGS}
  - LDFLAGS ........ : ${LDFLAGS}
  - LIBS ........... : ${LIBS}
    - BLAS ......... : ${BLAS_LIBS}
    - FFTW ......... : ${FFTW_LIB} ${FFTWF_LIB}
    - X11 .......... : ${X_LIBS}

Documentation tools:
  - doxygen ........ : ${doxygen_ok}
  - latex .......... : ${latex_ok}
  - dvips .......... : ${dvips_ok}
  - ghostscript .... : ${gs_ok}

"