/usr/lib/petscdir/3.1/aclocal/math-blaslapack.m4 is in libpetsc3.1-dev 3.1.dfsg-11ubuntu1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 | dnl Math and linear algebra checks by Adam Powell last modified 2002-10-16.
dnl Copyright 2002 Adam Powell, redistributable under the terms of the GNU
dnl General Public License version 2 or later.
AC_DEFUN([MATH_BLASLAPACK_CHECKS],[
dnl ffm is free fast math by Joachim Wesner and Kazushige Goto for
dnl Linux/Alpha.
AC_CHECK_HEADERS(libffm.h)
AC_CHECK_LIB(ffm, dsqrtiv,
MATH_LIBS="$MATH_LIBS -lffm" MATH_INCLUDES="-DFFM")
dnl Alphas need this sometimes
AC_CHECKING([whether -mieee is needed to avoid SIGFPE on divide by zero])
case $build/$CC in
alpha*/gcc* )
MIEEE_CFLAGS="-mieee"
AC_MSG_RESULT([yes])
;;
* )
MIEEE_CFLAGS=""
AC_MSG_RESULT([not needed])
;;
esac
AC_SUBST(MIEEE_CFLAGS)
dnl Used to check for IRIX multi-processor BLAS, but result was
dnl EXTREMELY slow (here just for historical purposes)
dnl AC_CHECK_LIB(blas_mp, dgemm_, BLAS_LIBS="-mp -lblas_mp", [
dnl AC_CHECK_LIB(f77blas, dgemm_, BLAS_LIBS="-lf77blas -latlas", [
dnl LIBS="$aLIBS $MATH_LIBS $FLIBS"])])
dnl For now, I don't see a need for mixed blas/lapackgf-3 or
dnl blas-3gf/lapack, only blas-3gf/lapackgf-3 and blas/lapack are checked.
AC_F77_LIBRARY_LDFLAGS
aLIBS="$LIBS"
LIBS="$aLIBS $FLIBS"
AC_CHECK_LIB(blas-3gf, dgemm_, [
HAVE_BLAS="yes" LIBS="-lblas-3gf $aLIBS $MATH_LIBS $FLIBS"
AC_CHECK_LIB(lapackgf-3, dgetrf_,
HAVE_LAPACK="yes"
BLASLAPACK_LIBS="-lblas-3gf -llapackgf-3 $FLIBS",
dnl This second check is for Debian woody on Alpha
LIBS="$aLIBS -lblas-3gf /lib/libgcc_s.so.1 $MATH_LIBS $FLIBS"
AC_CHECK_LIB(lapackgf-3, dgetri_,
HAVE_LAPACK="yes"
BLASLAPACK_LIBS="-lblas-3gf -llapackgf-3 /lib/libgcc_s.so.1 $MATH_LIBS",
HAVE_LAPACK="no"
BLASLAPACK_LIBS="-lblas-3gf $MATH_LIBS"))], [
AC_CHECK_LIB(blas, dgemv_, [
HAVE_BLAS="yes" LIBS="$aLIBS -lblas $MATH_LIBS $FLIBS"
AC_CHECK_LIB(lapack, dgetrf_,
HAVE_LAPACK="yes"
BLASLAPACK_LIBS="-lblas -llapack $MATH_LIBS $FLIBS",
BLASLAPACK_LIBS="-lblas $MATH_LIBS $FLIBS")])])
LIBS="$aLIBS"
dnl cpml is the Compaq Portable Math Library for Linux/Alpha, and often
dnl comes with cxml which has superfast blas/lapack included, so this
dnl overrides the above BLAS and LAPACK checks.
aLIBS="$LIBS"
LIBS="$aLIBS -lots"
AC_CHECK_LIB(cpml, sqrt,
MATH_LIBS="-lots -lcpml $MATH_LIBS"
MATH_INCLUDES="$MATH_INCLUDES" LIBS="-lots -lcpml $aLIBS" [
AC_CHECK_LIB(cxml, dgemm_,
BLASLAPACK_LIBS="-lcxml $MATH_LIBS"
HAVE_BLAS="yes" HAVE_LAPACK="yes")])
LIBS="$aLIBS"
AC_SUBST(MATH_LIBS)
AC_SUBST(MATH_INCLUDES)
AC_SUBST(BLASLAPACK_LIBS)
AC_SUBST(HAVE_BLAS)
AC_SUBST(HAVE_LAPACK)
])
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