I'm new to autoconf as well as linear algebra libraries. So far as I can tell, LAPACK, ATLAS, OpenBLAS, and KML can co-exist on the filesystem but you can only use one of the libraries at link-time and I would like to let ./configure choose whatever is available or let the user select it with ./configure --something.
Different distributions put things in different directories and it would be nice if autoconf can figure that out.
Questions:
Thank you for your help!
The PSFEX package does this, see https://github.com/astromatic/psfex/blob/master/configure.ac#L285 :
# Provide special options for INTEL MKL and force the use of icc
AC_MSG_CHECKING([whether INTEL's MKL is enabled])
AC_ARG_ENABLE(mkl,
[AS_HELP_STRING([--enable-mkl],
[Use INTEL's MKL for solvers and FFTs (default = no)])],
enable_icc="yes"
CC="icc"
AC_MSG_RESULT([yes]),
AC_MSG_RESULT([no]))
# Provide special options for ATLAS
AC_ARG_WITH(atlas-libdir,
[AS_HELP_STRING([--with-atlas-libdir=<ATLAS library path>],
[Provide an alternative path to the ATLAS library])])
AC_ARG_WITH(atlas-incdir,
[AS_HELP_STRING([--with-atlas-incdir=<ATLAS header dir>],
[Provide an alternative path to the ATLAS header directory])])
# Provide special options for OpenBLAS
AC_MSG_CHECKING([whether OpenBLAS is enabled])
AC_ARG_ENABLE(openblas,
[AS_HELP_STRING([--enable-openblas],
[Use the OpenBLAS library instead of ATLAS (default = no)])],
AC_MSG_RESULT([yes]),
AC_MSG_RESULT([no]))
AC_ARG_WITH(openblas-libdir,
[AS_HELP_STRING([--with-openblas-libdir=<OpenBLAS library path>],
[Provide an alternative path to the OpenBLAS library])])
AC_ARG_WITH(openblas-incdir,
[AS_HELP_STRING([--with-openblas-incdir=<OpenBLAS header dir>],
[Provide an alternative path to the OpenBLAS header directory])])
############ handle the INTEL MKL library (FFTW + LAPACKe) ###########
if test "$enable_mkl" = "yes"; then
convlibs="${srcdir}/../src/wcs/libwcs_c.a,${srcdir}/../src/levmar/liblevmar.a"
ACX_MKL($with_mkl_dir,no,$enable_best_link,$convlibs)
AC_MSG_CHECKING([for the INTEL MKL])
if test "$MKL_WARN" == ""; then
AC_MSG_RESULT([yes])
else
AC_MSG_RESULT([no])
AC_MSG_WARN([$MKL_WARN])
fi
AM_CFLAGS="$AM_CFLAGS $MKL_CFLAGS "
AM_LDFLAGS="$AM_LDFLAGS $MKL_LDFLAGS "
LIBS="$LIBS $MKL_LIBS"
############ Select either openblas or atlas ############
else
if test "x$enable_openblas" = "xyes"; then
######## Handle the OpenBLAS library (linear algebra: BLAS + LAPACKe) ########
ACX_OPENBLAS($with_openblas_libdir, $with_openblas_incdir, $use_pthreads, no,
[
AM_CFLAGS="$AM_CFLAGS $OPENBLAS_CFLAGS "
AM_LDFLAGS="$AM_LDFLAGS $OPENBLAS_LDFLAGS "
LIBS="$OPENBLAS_LIBS $LIBS"
if test "$OPENBLAS_WARN" != ""; then
AC_MSG_WARN([$OPENBLAS_WARN])
fi
],
AC_MSG_ERROR([$OPENBLAS_ERROR Exiting.])
)
else
######### handle the ATLAS library (linear algebra: BLAS + cLAPACK) ##########
ACX_ATLAS($with_atlas_libdir, $with_atlas_incdir, $use_pthreads,
[
[LIBS="$ATLAS_LIBS $LIBS"]
if test "$ATLAS_WARN" != ""; then
AC_MSG_WARN([$ATLAS_WARN])
fi
],
AC_MSG_ERROR([$ATLAS_ERROR Exiting. You could try --enable-openblas if Atlas is unavailable.])
)
fi
fi
AC_ARG_WITH([lapack],
[AS_HELP_STRING([--without-lapack],
[disable support for lapack])],
[],
[with_lapack=no])
LIBLAPACK=
AS_IF([test "x$with_lapack" != xno],
[
AX_BLAS([], [AC_MSG_ERROR([BLAS library not found])])
AX_LAPACK([], [AC_MSG_ERROR([LAPACK library not found])])
LIBS="$LAPACK_LIBS $BLAS_LIBS $LIBS $FLIBS"
AC_CHECK_LIB(
[lapack], [zgetrf],
[AC_SUBST([LIBLAPACK], ["$LAPACK_LIBS $BLAS_LIBS $LIBS $FLIBS"]) AC_DEFINE([LAPACK], [1], [Define if you have liblapack])],
[AC_MSG_FAILURE([lapack library test failed (--without-lapack to disable)])],
[])
])
Also note that you will need their macro libraries (available here) which are too big to paste into the answer: