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<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01//EN"
"http://www.w3.org/TR/html4/strict.dtd">
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<head>
<title>
Autoconf Macro: acx_blas
</title>
<link rel="stylesheet" type="text/css" href="ac-archive.css">
</head>
<body>
<table summary="web navigation" style="width:100%;">
<tbody>
<tr>
<td style="width:50%;" align="center">
<a href="http://autoconf-archive.cryp.to/acx_blas.m4">Download M4
Source</a>
</td>
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<a href="macros-by-category.html">Macro Index Page</a>
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<hr>
<h1>
acx_blas
</h1>
<h2>
Synopsis
</h2>
<p class="indent" style="white-space:nowrap;">
<code>ACX_BLAS([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 BLAS linear-algebra
interface (see http://www.netlib.org/blas/). On success, it sets the
BLAS_LIBS output variable to hold the requisite library linkages.
</p>
<p>
To link with BLAS, you should link with:
</p>
<pre>
$BLAS_LIBS $LIBS $FLIBS
</pre>
<p>
in that order. 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>
Many libraries are searched for, from ATLAS to CXML to ESSL. The user may
also use --with-blas=<lib> in order to use some specific BLAS 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 BLAS library.
</p>
<p>
ACTION-IF-FOUND is a list of shell commands to run if a BLAS 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_BLAS.
</p>
<p>
This macro requires autoconf 2.50 or later.
</p>
</div>
<h2>
Author
</h2>
<p class="indent">
Steven G. Johnson <stevenj@alum.mit.edu>
</p>
<h2>
Last Modified
</h2>
<p class="indent">
2001-12-13
</p>
<h2>
M4 Source Code
</h2>
<div class="indent">
<pre class="m4source">
AC_DEFUN([ACX_BLAS], [
AC_PREREQ(2.50)
AC_REQUIRE([AC_F77_LIBRARY_LDFLAGS])
acx_blas_ok=no
AC_ARG_WITH(blas,
[AC_HELP_STRING([--with-blas=<lib>], [use BLAS library <lib>])])
case $with_blas in
yes | "") ;;
no) acx_blas_ok=disable ;;
-* | */* | *.a | *.so | *.so.* | *.o) BLAS_LIBS="$with_blas" ;;
*) BLAS_LIBS="-l$with_blas" ;;
esac
# Get fortran linker names of BLAS functions to check for.
AC_F77_FUNC(sgemm)
AC_F77_FUNC(dgemm)
acx_blas_save_LIBS="$LIBS"
LIBS="$LIBS $FLIBS"
# First, check BLAS_LIBS environment variable
if test $acx_blas_ok = no; then
if test "x$BLAS_LIBS" != x; then
save_LIBS="$LIBS"; LIBS="$BLAS_LIBS $LIBS"
AC_MSG_CHECKING([for $sgemm in $BLAS_LIBS])
AC_TRY_LINK_FUNC($sgemm, [acx_blas_ok=yes], [BLAS_LIBS=""])
AC_MSG_RESULT($acx_blas_ok)
LIBS="$save_LIBS"
fi
fi
# BLAS linked to by default? (happens on some supercomputers)
if test $acx_blas_ok = no; then
save_LIBS="$LIBS"; LIBS="$LIBS"
AC_CHECK_FUNC($sgemm, [acx_blas_ok=yes])
LIBS="$save_LIBS"
fi
# BLAS in ATLAS library? (http://math-atlas.sourceforge.net/)
if test $acx_blas_ok = no; then
AC_CHECK_LIB(atlas, ATL_xerbla,
[AC_CHECK_LIB(f77blas, $sgemm,
[AC_CHECK_LIB(cblas, cblas_dgemm,
[acx_blas_ok=yes
BLAS_LIBS="-lcblas -lf77blas -latlas"],
[], [-lf77blas -latlas])],
[], [-latlas])])
fi
# BLAS in PhiPACK libraries? (requires generic BLAS lib, too)
if test $acx_blas_ok = no; then
AC_CHECK_LIB(blas, $sgemm,
[AC_CHECK_LIB(dgemm, $dgemm,
[AC_CHECK_LIB(sgemm, $sgemm,
[acx_blas_ok=yes; BLAS_LIBS="-lsgemm -ldgemm -lblas"],
[], [-lblas])],
[], [-lblas])])
fi
# BLAS in Alpha CXML library?
if test $acx_blas_ok = no; then
AC_CHECK_LIB(cxml, $sgemm, [acx_blas_ok=yes;BLAS_LIBS="-lcxml"])
fi
# BLAS in Alpha DXML library? (now called CXML, see above)
if test $acx_blas_ok = no; then
AC_CHECK_LIB(dxml, $sgemm, [acx_blas_ok=yes;BLAS_LIBS="-ldxml"])
fi
# BLAS in Sun Performance library?
if test $acx_blas_ok = no; then
if test "x$GCC" != xyes; then # only works with Sun CC
AC_CHECK_LIB(sunmath, acosp,
[AC_CHECK_LIB(sunperf, $sgemm,
[BLAS_LIBS="-xlic_lib=sunperf -lsunmath"
acx_blas_ok=yes],[],[-lsunmath])])
fi
fi
# BLAS in SCSL library? (SGI/Cray Scientific Library)
if test $acx_blas_ok = no; then
AC_CHECK_LIB(scs, $sgemm, [acx_blas_ok=yes; BLAS_LIBS="-lscs"])
fi
# BLAS in SGIMATH library?
if test $acx_blas_ok = no; then
AC_CHECK_LIB(complib.sgimath, $sgemm,
[acx_blas_ok=yes; BLAS_LIBS="-lcomplib.sgimath"])
fi
# BLAS in IBM ESSL library? (requires generic BLAS lib, too)
if test $acx_blas_ok = no; then
AC_CHECK_LIB(blas, $sgemm,
[AC_CHECK_LIB(essl, $sgemm,
[acx_blas_ok=yes; BLAS_LIBS="-lessl -lblas"],
[], [-lblas $FLIBS])])
fi
# Generic BLAS library?
if test $acx_blas_ok = no; then
AC_CHECK_LIB(blas, $sgemm, [acx_blas_ok=yes; BLAS_LIBS="-lblas"])
fi
AC_SUBST(BLAS_LIBS)
LIBS="$acx_blas_save_LIBS"
# Finally, execute ACTION-IF-FOUND/ACTION-IF-NOT-FOUND:
if test x"$acx_blas_ok" = xyes; then
ifelse([$1],,AC_DEFINE(HAVE_BLAS,1,[Define if you have a BLAS library.]),[$1])
:
else
acx_blas_ok=no
$2
fi
])dnl ACX_BLAS
</pre>
</div>
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