#!/bin/sh

# Slackware build script for BLAS

# Copyright 2014-2015 Kyle Guinn <elyk03@gmail.com>, USA
# All rights reserved.
#
# Redistribution and use of this script, with or without modification, is
# permitted provided that the following conditions are met:
#
# 1. Redistributions of this script must retain the above copyright
#    notice, this list of conditions and the following disclaimer.
#
#  THIS SOFTWARE IS PROVIDED BY THE AUTHOR "AS IS" AND ANY EXPRESS OR IMPLIED
#  WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
#  MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO
#  EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
#  SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
#  PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
#  OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
#  WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
#  OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
#  ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

PRGNAM=blas
SRCNAM=lapack
VERSION=${VERSION:-3.5.0}
BUILD=${BUILD:-2}
TAG=${TAG:-_SBo}

if [ -z "$ARCH" ]; then
  case "$(uname -m)" in
    i?86) ARCH=i486 ;;
    arm*) ARCH=arm ;;
       *) ARCH=$(uname -m) ;;
  esac
fi

CWD=$(pwd)
TMP=${TMP:-/tmp/SBo}
PKG=$TMP/package-$PRGNAM
OUTPUT=${OUTPUT:-/tmp}

DOCS="LICENSE"

if [ "$ARCH" = "i486" ]; then
  SLKCFLAGS="-O2 -march=i486 -mtune=i686"
  LIBDIRSUFFIX=""
elif [ "$ARCH" = "i686" ]; then
  SLKCFLAGS="-O2 -march=i686 -mtune=i686"
  LIBDIRSUFFIX=""
elif [ "$ARCH" = "x86_64" ]; then
  SLKCFLAGS="-O2 -fPIC"
  LIBDIRSUFFIX="64"
else
  SLKCFLAGS="-O2"
  LIBDIRSUFFIX=""
fi

set -e

rm -rf $PKG
mkdir -p $TMP $PKG $OUTPUT
cd $TMP
rm -rf $SRCNAM-$VERSION
tar xvf $CWD/$SRCNAM-$VERSION.tgz
cd $SRCNAM-$VERSION
chown -R root:root .
chmod -R u+w,go-w,a+rX-st .

# `make install` wants to compile and install the rest of lapack,
# so install files manually instead.
#
# Avoid adding an RPATH entry to the shared lib.  It's unnecessary, and
# since we're not running `make install` we don't want to end up with
# a temporary RPATH that refers to the build directory.
#
# WARNING:  The SONAME is "libblas.so", not "libblas.so.0" nor
# "libblas.so.$MAJOR" as crafted in previous versions of this script.
# I don't know if this is intentional or an omission by upstream.
mkdir -p shared
cd shared
  cmake \
    -DCMAKE_Fortran_FLAGS:STRING="$SLKCFLAGS" \
    -DCMAKE_INSTALL_PREFIX=/usr \
    -DLIB_SUFFIX=${LIBDIRSUFFIX} \
    -DCMAKE_BUILD_TYPE=Release \
    -DCMAKE_RULE_MESSAGES=OFF \
    -DCMAKE_VERBOSE_MAKEFILE=TRUE \
    -DBUILD_SHARED_LIBS=ON \
    -DCMAKE_SKIP_RPATH=YES \
    ..
  make blas/fast
  install -D -m0755 -s lib/libblas.so $PKG/usr/lib${LIBDIRSUFFIX}/libblas.so
  install -D -m0644 BLAS/blas.pc $PKG/usr/lib${LIBDIRSUFFIX}/pkgconfig/blas.pc
cd ..

# cmake doesn't appear to let us build both shared and static libs
# at the same time, so build it twice.  This may build a non-PIC library
# on some architectures, which should be faster.
mkdir -p static
cd static
  cmake \
    -DCMAKE_Fortran_FLAGS:STRING="$SLKCFLAGS" \
    -DCMAKE_INSTALL_PREFIX=/usr \
    -DLIB_SUFFIX=${LIBDIRSUFFIX} \
    -DCMAKE_BUILD_TYPE=Release \
    -DCMAKE_RULE_MESSAGES=OFF \
    -DCMAKE_VERBOSE_MAKEFILE=TRUE \
    ..
  make blas/fast
  install -D -m0644 lib/libblas.a $PKG/usr/lib${LIBDIRSUFFIX}/libblas.a
cd ..

# Fix the pkg-config file:
# 1.  Version is missing.
# 2.  -L is hard-coded when a variable exists.
sed -i \
  -e "/^Version:/cVersion: ${VERSION}" \
  -e "/^Libs:/s/-L[^ ]*/-L\${libdir}/" \
  $PKG/usr/lib${LIBDIRSUFFIX}/pkgconfig/blas.pc

# Generate man pages.  Also requires some fix-ups:
# 1.  Replace "LAPACK" with "BLAS" in headers/footers.
# 2.  Version is wrong.
# 3.  Only generate on the BLAS sources.
# 4.  Turn off some repetitive comments.
# 5.  Turn off HAVE_DOT.  Graphs are unnecessary for this purpose.
# 6.  Turn off MAN_LINKS.  See below.
sed -i \
  -e "s/^\(PROJECT_NAME *=\).*/\1 BLAS/" \
  -e "s/^\(PROJECT_NUMBER *=\).*/\1 ${VERSION}/" \
  -e "s/^\(INPUT *=\).*/\1 BLAS\/SRC/" \
  -e "s/^\(REPEAT_BRIEF *=\).*/\1 NO/" \
  -e "s/^\(HAVE_DOT *=\).*/\1 NO/" \
  -e "s/^\(MAN_LINKS *=\).*/\1 NO/" \
  DOCS/Doxyfile_man
doxygen DOCS/Doxyfile_man
# Doxygen generates manpages on a file-by-file basis (note the .f extensions).
# We want a page for each function, not each file.  MAN_LINKS creates a page
# for each function that just sources the page for the corresponding file.
# This adds a lot of bloat.  Luckily, functions map 1:1 with files, so we can
# rename .f.3 -> .3 to have the page named after the function.
mkdir -p $PKG/usr/man/man3
for i in DOCS/man/man3/*.f.3; do
  gzip -9c $i > $PKG/usr/man/man3/$(basename $i .f.3).3.gz
done

mkdir -p $PKG/usr/doc/$PRGNAM-$VERSION
cp -a $DOCS $PKG/usr/doc/$PRGNAM-$VERSION
cat $CWD/$PRGNAM.SlackBuild > $PKG/usr/doc/$PRGNAM-$VERSION/$PRGNAM.SlackBuild

mkdir -p $PKG/install
cat $CWD/slack-desc > $PKG/install/slack-desc

cd $PKG
/sbin/makepkg -l y -c n $OUTPUT/$PRGNAM-$VERSION-$ARCH-$BUILD$TAG.${PKGTYPE:-tgz}