#! /bin/bash

# LLVM 14 
# Source: https://github.com/llvm/llvm-project/releases/download/llvmorg-14.0.0/llvm-14.0.0.src.tar.xz
# Source: https://github.com/llvm/llvm-project/releases/download/llvmorg-14.0.0/clang-14.0.0.src.tar.xz
# Source: https://github.com/llvm/llvm-project/releases/download/llvmorg-14.0.0/compiler-rt-14.0.0.src.tar.xz
# Source: https://github.com/llvm/llvm-project/releases/download/llvmorg-14.0.0/lld-14.0.0.src.tar.xz
#
# $BUILD = Directory to temporarily install
# $PKGS  = Directory to store built packages
#
# DEPS
# Required:     cmake libexecinfo
# Recommended:  NONE
# Optional:     doxygen git graphviz libxml2 Pygments rsync texlive/install-tl-unx  valgrind

# Unpack
tar -xf ../clang-14.0.0.src.tar.xz -C tools && \
mv tools/clang-14.0.0.src tools/clang &&\
tar -xf ../compiler-rt-14.0.0.src.tar.xz -C projects && \
mv projects/compiler-rt-14.0.0.src projects/compiler-rt && \
tar -xf ../lld-14.0.0.src.tar.xz -C tools && \
mv tools/lld-14.0.0.src tools/lld && \

# Fix scripts to use python3:
grep -rl '#!.*python' | xargs sed -i '1s/python$/python3/'

# Fix missing header for lld, https://bugs.llvm.org/show_bug.cgi?id=49228
mkdir -pv tools/lld/include/mach-o
cp -v ../files/libunwind-llvm14/compact_unwind_encoding.h tools/lld/include/mach-o

# Update host/target triple detection
cp -v ../files/config.guess-musl cmake/config.guess

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

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"
		   ;;
	 aarch64*) # Not yet tested for ARM. May need patching
		   export BARCH="AArch64"
		   export B_TARGETS="ARM;AArch64"
		   export B_TRUPLE="aarch64-unknown-linux-musleabihf"
		   ;;
esac

# Set the configure options:
export  CARGS="-DLLVM_ENABLE_FFI=ON "
export CARGS+="-DCMAKE_BUILD_TYPE=Release "
export CARGS+="-DLLVM_BUILD_LLVM_DYLIB=ON "
export CARGS+="-DLLVM_LINK_LLVM_DYLIB=ON "
export CARGS+="-DLLVM_BUILD_TESTS=OFF "
export CARGS+="-DLLVM_INSTALL_UTILS=ON "

# Build LLVM with run-time type information. Required for building Mesa
export CARGS+="-DLLVM_ENABLE_RTTI=ON "

# Disable generation build targets for the LLVM benchmarks. Requires additional 
# code that is not currently available
export CARGS+="-DLLVM_INCLUDE_BENCHMARKS=OFF "

# Configure source to use gcc and link with libexecinfo
LDFLAGS="-Wl,-lexecinfo " \
CC=gcc CXX=g++ \
cmake -B OUT -DCMAKE_INSTALL_PREFIX=/usr \
             -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}" \
	     $CARGS -Wno-dev -G Ninja 

read -p "Compile?" && ninja -j2 -C OUT && \

cd OUT && \
sudo -S cmake -DCMAKE_INSTALL_PREFIX=${BUILD}/usr -P cmake_install.cmake && \

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/ &&

sudo mkdir -pv /BMAN/usr/share && \
sudo mv usr/share/man /BMAN/usr/share && \

sudo makepkg -l y -c n $PKGS/llvm-14.0.0-$(uname -m)-mlfs.txz &&
cd /BMAN && \
sudo mkdir -pv install && \
cat > /tmp/slack-desc << "EOF"
llvm-doc: Manpages for  llvm (LLVM compiler toolkit)
llvm-doc:
llvm-doc: Low Level Virtual Machine is a toolkit for the construction of highly
llvm-doc: optimized compilers, optimizers, and runtime environments.
llvm-doc:
llvm-doc:  http://llvm.org/
llvm-doc:
EOF
sudo mv /tmp/slack-desc install/ && \

sudo makepkg -l y -c n $PKGS/llvm-doc-14.0.0-noarch-mlfs.txz &&
sudo rm -rf $BUILD/* /BMAN/*