#! /bin/bash

# LLVM 11.0.0
# Source: https://github.com/llvm/llvm-project/releases/download/llvmorg-11.0.0/llvm-11.0.0.src.tar.xz
# Source: https://github.com/llvm/llvm-project/releases/download/llvmorg-11.0.0/clang-11.0.0.src.tar.xz
# Source: https://github.com/llvm/llvm-project/releases/download/llvmorg-11.0.0/compiler-rt-11.0.0.src.tar.xz
# Source: https://github.com/llvm/llvm-project/releases/download/llvmorg-11.0.0/lld-11.0.0.src.tar.xz 
#
# $BUILD = Directory to temporarily install
# $PKGS  = Directory to store built packages
#
# DEPS
# Required:     CMake
# Recommended:  NONE
# Optional:     Doxygen, git, Graphviz, libxml2, Python2, rsync(for tests), 
# Optional:     texlive-20200406 (or install-tl-unx), Valgrind, PyYAML, 
# Optional:     Zip, OCaml, psutil, recommonmark, Sphinx, and Z3 


patch -Np1 -i ../patches/llvm11-void/llvm-001-musl.patch
patch -Np1 -i ../patches/llvm11-void/llvm-002-ppcle.patch
patch -Np1 -i ../patches/llvm11-void/llvm-002-musl-ppc64-elfv2.patch
patch -Np1 -i ../patches/llvm11-void/llvm-003-ppc-secureplt.patch
patch -Np1 -i ../patches/llvm11-void/llvm-004-override-opt.patch
patch -Np1 -i ../patches/llvm11-void/llvm-005-ppc-bigpic.patch
patch -Np1 -i ../patches/llvm11-void/llvm-006-aarch64-mf_exec.patch

tar -xf ../compiler-rt-11.0.0.src.tar.xz  -C projects &&
mv -v projects/compiler-rt-11.0.0.src  projects/compiler-rt

tar -xf ../clang-11.0.0.src.tar.xz -C tools &&
mv -v tools/clang-11.0.0.src tools/clang && cd tools/clang
patch -Np1 -i ../../../patches/llvm11-void/clang-001-fix-unwind-chain-inclusion.patch
patch -Np1 -i ../../../patches/llvm11-void/clang-001-ppcle.patch
patch -Np1 -i ../../../patches/llvm11-void/clang-002-add-musl-triples.patch
patch -Np1 -i ../../../patches/llvm11-void/clang-003-ppc64-dynamic-linker-path.patch
patch -Np1 -i ../../../patches/llvm11-void/clang-004-ppc64-musl-elfv2.patch
cd -

tar -xf ../lld-11.0.0.src.tar.xz -C tools &&
mv -v tools/lld-11.0.0.src tools/lld

# Disable sanitizers for musl-based systems
sed -i 's/set(COMPILER_RT_HAS_SANITIZER_COMMON TRUE)/set(COMPILER_RT_HAS_SANITIZER_COMMON FALSE)/' projects/compiler-rt/cmake/config-ix.cmake &&

# Vastly reduce size of debugging symbols:
export CFLAGS=" -g -g1"
export CXXFLAGS=" -g -g1"

# If building with binutils in /opt/gnu instead of /usr (CMLFS):
export   CFLAGS="$CFLAGS -I/opt/gnu/include"
export CXXFLAGS="$CXXFLAGS -I/opt/gnu/include"

case $(uname -m) in
	i686*)    export BARCH="X86"
		  export B_TARGETS="AMDGPU"
		  export B_TRUPLE="i686-unknown-linux-musl"
		;;
	x86_64*)  export BARCH="X86"
		  export B_TARGETS="AMDGPU"
		  export B_TRUPLE="x86_64-unknown-linux-musl"
		;;
	armv5*)   export BARCH="Armv5te"
		  export B_TARGETS="ARM"
		  export B_TRUPLE="armv5l-unknown-linux-musleabi"
		;;
	armv6*)   export BARCH="Armv6"
		  export B_TARGETS="ARM"
		  export B_TRUPLE="armv6l-unknown-linux-musleabi"
		;;
	armv7*)   export BARCH="Armv7"
		  export B_TARGETS="ARM"
		  export B_TRUPLE="armv7l-unknown-linux-musleabihf"
		;;
	aarch64*) export BARCH="AArch64"
		  export B_TARGETS="ARM;AArch64"
		  export B_TRUPLE="aarch64-unknown-linux-musleabihf"
		;;
esac


mkdir -v build &&
cd       build &&

CC=gcc CXX=g++                                  \
cmake -DCMAKE_INSTALL_PREFIX=/usr               \
      -DLLVM_ENABLE_FFI=ON                      \
      -DCMAKE_BUILD_TYPE=Release                \
      -DLLVM_BUILD_LLVM_DYLIB=ON                \
      -DLLVM_LINK_LLVM_DYLIB=ON                 \
      -DLLVM_ENABLE_RTTI=ON                     \
      -DLLVM_BUILD_TESTS=ON                     \
      -DLLVM_INSTALL_UTILS=ON                   \
      -DLLVM_BINUTILS_INCDIR="/usr/include"     \
      -DLLVM_TARGET_ARCH=${BARCH}               \
      -DLLVM_TARGETS_TO_BUILD="host;BPF;${B_TARGETS}"    \
      -DLLVM_HOST_TRIPLE="${B_TRUPLE}"                   \
      -DLLVM_DEFAULT_TARGET_TRIPLE="${B_TRUPLE}"         \
      -DCOMPILER_RT_DEFAULT_TARGET_TRIPLE="${B_TRUPLE}"     \  
      -Wno-dev -G Ninja ..

unset CFLAGS CXXFLAGS BARCH B_TARGETS

read -p "Compile?" && time { ninja -j2 ; } &&

read -p "Press Enter to install" &&
# if not using a package manager:
# ninja install
# OR
# cmake -DCMAKE_INSTALL_PREFIX=/usr -P cmake_install.cmake

# if using pkgtools from Slackware, then:
sudo -S cmake -DCMAKE_INSTALL_PREFIX=${BUILD}/usr -P cmake_install.cmake

read -p "Press Enter to create pakage description."
cd $BUILD && sudo mkdir -v install &&
cat > /tmp/slack-desc << "EOF"
# 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------------------------------------------------------|
llvm: llvm (LLVM compiler toolkit)
llvm:
llvm: Low Level Virtual Machine is a toolkit for the construction of highly
llvm: optimized compilers, optimizers, and runtime environments.
llvm:
llvm: This package also includes the clang frontend for the C family of
llvm: languages:  C, C++, Objective-C, and Objective-C++
llvm:
llvm:
llvm: Homepage: http://llvm.org/
llvm:
EOF
sudo mv /tmp/slack-desc install/ &&

read -p "Enter to build and install package" &&
sudo makepkg -l y -c n $PKGS/llvm-11.0.0-$(uname -m)-mlfs.txz &&
sudo rm -rf $BUILD/*