development/gn: Added (Meta-build system).

Signed-off-by: Willy Sudiarto Raharjo <willysr@slackbuilds.org>

development/gn/README

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+GN is a meta-build system that generates build files for Ninja.
+
+The dependency on ninja can be avoided by installing samu from SBo
+instead. To build with samu instead of ninja use:
+
+  NINJA=samu ./gn.SlackBuild

development/gn/gn.SlackBuild

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+#!/bin/sh
+
+# Slackware build script for gn
+
+# Copyright 2020 Hunter Sezen California, 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=gn
+VERSION=${VERSION:-0.1616}
+BUILD=${BUILD:-1}
+TAG=${TAG:-_SBo}
+
+if [ -z "$ARCH" ]; then
+  case "$( uname -m )" in
+    i?86) ARCH=i586 ;;
+    arm*) ARCH=arm ;;
+       *) ARCH=$( uname -m ) ;;
+  esac
+fi
+
+CWD=$(pwd)
+TMP=${TMP:-/tmp/SBo}
+PKG=$TMP/package-$PRGNAM
+OUTPUT=${OUTPUT:-/tmp}
+
+if [ "$ARCH" = "i586" ]; then
+  SLKCFLAGS="-O2 -march=i586 -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 -eu
+
+rm -rf $PKG
+mkdir -p $TMP $PKG $OUTPUT
+cd $TMP
+rm -rf $PRGNAM-$VERSION
+tar xvf $CWD/$PRGNAM-$VERSION.tar.xz
+cd $PRGNAM-$VERSION
+chown -R root:root .
+find -L . \
+ \( -perm 777 -o -perm 775 -o -perm 750 -o -perm 711 -o -perm 555 \
+  -o -perm 511 \) -exec chmod 755 {} \; -o \
+ \( -perm 666 -o -perm 664 -o -perm 640 -o -perm 600 -o -perm 444 \
+  -o -perm 440 -o -perm 400 \) -exec chmod 644 {} \;
+
+./build/gen.py --no-last-commit-position --no-strip
+
+# generate last_commit_position.h (from gentoo)
+cat > out/last_commit_position.h <<EOF
+#ifndef OUT_LAST_COMMIT_POSITION_H_
+#define OUT_LAST_COMMIT_POSITION_H_
+#define LAST_COMMIT_POSITION "$PRGNAM-$VERSION"
+#endif  // OUT_LAST_COMMIT_POSITION_H_
+EOF
+
+"${NINJA:=ninja}" -C out gn
+"$NINJA" -C out gn_unittests
+
+out/gn_unittests
+
+mkdir -p $PKG/usr/bin
+cp out/gn $PKG/usr/bin
+
+find $PKG -print0 | xargs -0 file | grep -e "executable" -e "shared object" |
+  grep ELF | cut -f 1 -d : | xargs strip --strip-unneeded 2> /dev/null || true
+
+mkdir -p $PKG/usr/doc/$PRGNAM-$VERSION
+cp -a AUTHORS LICENSE OWNERS README.md $PKG/usr/doc/$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}

development/gn/gn.info

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+PRGNAM="gn"
+VERSION="0.1616"
+HOMEPAGE="https://gn.googlesource.com/"
+DOWNLOAD="https://dev.gentoo.org/~floppym/dist/gn-0.1616.tar.xz"
+MD5SUM="46910008292788151243c169e7c2e2d3"
+DOWNLOAD_x86_64=""
+MD5SUM_x86_64=""
+REQUIRES="ninja"
+MAINTAINER="Hunter Sezen"
+EMAIL="orbea@riseup.net"

development/gn/slack-desc

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+# HOW TO EDIT THIS FILE:
+# The "handy ruler" below makes it easier to edit a package description.
+# Line up the first '|' above the ':' following the base package name, and
+# the '|' on the right side marks the last column you can put a character in.
+# You must make exactly 11 lines for the formatting to be correct.  It's also
+# customary to leave one space after the ':' except on otherwise blank lines.
+
+  |-----handy-ruler------------------------------------------------------|
+gn: gn (Meta-build system)
+gn:
+gn: GN is a meta-build system that generates build files for Ninja.
+gn:
+gn: Homepage: https://gn.googlesource.com/gn/
+gn:
+gn:
+gn:
+gn:
+gn:
+gn: