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Autoconf Macro: acx_lapack
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<hr>
<h1>
acx_lapack
</h1>
<h2>
Synopsis
</h2>
<p class="indent" style="white-space:nowrap;">
<code>ACX_LAPACK([ACTION-IF-FOUND[, ACTION-IF-NOT-FOUND]])</code>
</p>
<h2>
Description
</h2>
<div class="indent">
<p>
This macro looks for a library that implements the LAPACK linear-algebra
interface (see http://www.netlib.org/lapack/). On success, it sets the
LAPACK_LIBS output variable to hold the requisite library linkages.
</p>
<p>
To link with LAPACK, you should link with:
</p>
<pre>
$LAPACK_LIBS $BLAS_LIBS $LIBS $FLIBS
</pre>
<p>
in that order. BLAS_LIBS is the output variable of the ACX_BLAS macro,
called automatically. FLIBS is the output variable of the
AC_F77_LIBRARY_LDFLAGS macro (called if necessary by ACX_BLAS), and is
sometimes necessary in order to link with F77 libraries. Users will also
need to use AC_F77_DUMMY_MAIN (see the autoconf manual), for the same
reason.
</p>
<p>
The user may also use --with-lapack=<lib> in order to use some
specific LAPACK library <lib>. In order to link successfully,
however, be aware that you will probably need to use the same Fortran
compiler (which can be set via the F77 env. var.) as was used to compile
the LAPACK and BLAS libraries.
</p>
<p>
ACTION-IF-FOUND is a list of shell commands to run if a LAPACK library is
found, and ACTION-IF-NOT-FOUND is a list of commands to run it if it is not
found. If ACTION-IF-FOUND is not specified, the default action will define
HAVE_LAPACK.
</p>
</div>
<h2>
Author
</h2>
<p class="indent">
Steven G. Johnson <stevenj@alum.mit.edu>
</p>
<h2>
Last Modified
</h2>
<p class="indent">
2002-03-12
</p>
<h2>
M4 Source Code
</h2>
<div class="indent">
<pre class="m4source">
AC_DEFUN([ACX_LAPACK], [
AC_REQUIRE([ACX_BLAS])
acx_lapack_ok=no
AC_ARG_WITH(lapack,
[AC_HELP_STRING([--with-lapack=<lib>], [use LAPACK library <lib>])])
case $with_lapack in
yes | "") ;;
no) acx_lapack_ok=disable ;;
-* | */* | *.a | *.so | *.so.* | *.o) LAPACK_LIBS="$with_lapack" ;;
*) LAPACK_LIBS="-l$with_lapack" ;;
esac
# Get fortran linker name of LAPACK function to check for.
AC_F77_FUNC(cheev)
# We cannot use LAPACK if BLAS is not found
if test "x$acx_blas_ok" != xyes; then
acx_lapack_ok=noblas
fi
# First, check LAPACK_LIBS environment variable
if test "x$LAPACK_LIBS" != x; then
save_LIBS="$LIBS"; LIBS="$LAPACK_LIBS $BLAS_LIBS $LIBS $FLIBS"
AC_MSG_CHECKING([for $cheev in $LAPACK_LIBS])
AC_TRY_LINK_FUNC($cheev, [acx_lapack_ok=yes], [LAPACK_LIBS=""])
AC_MSG_RESULT($acx_lapack_ok)
LIBS="$save_LIBS"
if test acx_lapack_ok = no; then
LAPACK_LIBS=""
fi
fi
# LAPACK linked to by default? (is sometimes included in BLAS lib)
if test $acx_lapack_ok = no; then
save_LIBS="$LIBS"; LIBS="$LIBS $BLAS_LIBS $FLIBS"
AC_CHECK_FUNC($cheev, [acx_lapack_ok=yes])
LIBS="$save_LIBS"
fi
# Generic LAPACK library?
for lapack in lapack lapack_rs6k; do
if test $acx_lapack_ok = no; then
save_LIBS="$LIBS"; LIBS="$BLAS_LIBS $LIBS"
AC_CHECK_LIB($lapack, $cheev,
[acx_lapack_ok=yes; LAPACK_LIBS="-l$lapack"], [], [$FLIBS])
LIBS="$save_LIBS"
fi
done
AC_SUBST(LAPACK_LIBS)
# Finally, execute ACTION-IF-FOUND/ACTION-IF-NOT-FOUND:
if test x"$acx_lapack_ok" = xyes; then
ifelse([$1],,AC_DEFINE(HAVE_LAPACK,1,[Define if you have LAPACK library.]),[$1])
:
else
acx_lapack_ok=no
$2
fi
])dnl ACX_LAPACK
</pre>
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