# Maintainer: Johannes Löthberg <johannes@kyriasis.com>
# Maintainer: Jan Alexander Steffens (heftig) <heftig@archlinux.org>
# Contributor: Alexander F Rødseth <xyproto@archlinux.org>
# Contributor: Daniel Micay <danielmicay@gmail.com>
# Contributor: userwithuid <userwithuid@gmail.com>

# ALARM: Kevin Mihelich <kevin@archlinuxarm.org>
#  - remove lib32, musl, and wasm packages and related bits
#  - add a link to g++ to compensate for broken cross-compiler decisions
#  - build v6/v7 with -j2 - RAM constraints
#  - set llvm-config in config.toml for ARM architectures
#  - set debuginfo-level = 0 in config.toml - RAM constraints
#  - build aarch64 with 16k page support

highmem=1

pkgbase=rust
pkgname=(
  rust
  rust-src
)
epoch=1
pkgver=1.74.1
pkgrel=1
pkgdesc="Systems programming language focused on safety, speed and concurrency"
url=https://www.rust-lang.org/
arch=(x86_64)
license=(
  Apache
  MIT
)
options=(
  !debug
  !emptydirs
  !lto
  !strip
)
depends=(
  curl
  gcc
  gcc-libs
  libssh2
  llvm-libs
)
makedepends=(
  cmake
  libffi
  lld
  llvm
  musl
  ninja
  perl
  python
  rust
)
checkdepends=(
  gdb
  procps-ng
)
source=(
  "https://static.rust-lang.org/dist/rustc-$pkgver-src.tar.gz"{,.asc}
  0001-bootstrap-Change-libexec-dir.patch
  0002-bootstrap-Change-bash-completion-dir.patch
  0003-compiler-Change-LLVM-targets.patch
  0004-compiler-Use-wasm-ld-for-wasm-targets.patch
)
b2sums=('71d86d8606ee06c44cd395a8fac73b6cdebd9c8993fdf9395e3f89bdd7fa480a273233f4c18e0823e889a2e5045354e1638d827e7c9d162c5101b3e6bb9af294'
        'SKIP'
        'b9591ca4b50ff4d825deeca1858a65ae6b25171e4a03f2fdee9a51e79590825e012af0592df63ecb7b27837d0959e7f0c4075dddddb42c8cc4ee98be451d0d12'
        'c8db828623b9bc2c9c34a4594f4c9409585c55815d0f3c0bf8b48ea2d3a01fe866c15850503ad5d3b6e04a6e68dd7e7f064d9745f4eb60a267fb90c7ad101d70'
        'a55aad4494907ea2f394754026b4ddff03a062a60ba92fc53aa6b6bcf3065807ca8df61ed1502e3873c114704533ae2790df1970cc4be44f8b89e1094be583b1'
        'e0acea294146ae14ec18ac1f99cb9113dfe0dbe87cfd557fb093b56fc15cf036ac076af905fbe358a11a913d2fc845619c5fd8e18ac97127c232127a28666117')
validpgpkeys=(
  108F66205EAEB0AAA8DD5E1C85AB96E6FA1BE5FE  # Rust Language (Tag and Release Signing Key) <rust-key@rust-lang.org>
)

prepare() {
  cd rustc-$pkgver-src

  # Patch bootstrap so that rust-analyzer-proc-macro-srv
  # is in /usr/lib instead of /usr/libexec
  patch -Np1 -i ../0001-bootstrap-Change-libexec-dir.patch

  # Put bash completions where they belong
  patch -Np1 -i ../0002-bootstrap-Change-bash-completion-dir.patch

  # Use our *-pc-linux-gnu targets, making LTO with clang simpler
  patch -Np1 -i ../0003-compiler-Change-LLVM-targets.patch

  # Use our wasm-ld
  patch -Np1 -i ../0004-compiler-Use-wasm-ld-for-wasm-targets.patch

  cat >config.toml <<END
profile = "user"
changelog-seen = 2

[llvm]
link-shared = true

[build]
cargo = "/usr/bin/cargo"
rustc = "/usr/bin/rustc"
rustfmt = "/usr/bin/rustfmt"
locked-deps = true
vendor = true
tools = [
  "cargo",
  "clippy",
  "rustdoc",
  "rustfmt",
  "rust-analyzer-proc-macro-srv",
  "analysis",
  "src",
  "rust-demangler",
]
sanitizers = false
profiler = true

# Generating docs fails with the wasm32-* targets
docs = false

[install]
prefix = "/usr"

[rust]
debuginfo-level-std = 0
channel = "stable"
description = "Arch Linux $pkgbase $epoch:$pkgver-$pkgrel"
rpath = false
backtrace-on-ice = true
remap-debuginfo = true
jemalloc = true

# LLVM crashes when passing an object through ThinLTO twice.  This is triggered
# when using rust code in cross-language LTO if libstd was built using ThinLTO.
# http://blog.llvm.org/2019/09/closing-gap-cross-language-lto-between.html
# https://github.com/rust-lang/rust/issues/54872
codegen-units-std = 1

# musl target produces warnings
deny-warnings = false

[dist]
compression-formats = ["gz"]

[target.x86_64-unknown-linux-gnu]
cc = "/usr/bin/gcc"
cxx = "/usr/bin/g++"
ar = "/usr/bin/gcc-ar"
ranlib = "/usr/bin/gcc-ranlib"
llvm-config = "/usr/bin/llvm-config"

[target.i686-unknown-linux-gnu]
cc = "/usr/bin/gcc"
cxx = "/usr/bin/g++"
ar = "/usr/bin/gcc-ar"
ranlib = "/usr/bin/gcc-ranlib"

[target.aarch64-unknown-linux-gnu]
cc = "/usr/bin/gcc"
cxx = "/usr/bin/g++"
ar = "/usr/bin/gcc-ar"
ranlib = "/usr/bin/gcc-ranlib"
llvm-config = "/usr/bin/llvm-config"

[target.armv7-unknown-linux-gnueabihf]
cc = "/usr/bin/gcc"
cxx = "/usr/bin/g++"
ar = "/usr/bin/gcc-ar"
ranlib = "/usr/bin/gcc-ranlib"
llvm-config = "/usr/bin/llvm-config"

[target.arm-unknown-linux-gnueabihf]
cc = "/usr/bin/gcc"
cxx = "/usr/bin/g++"
ar = "/usr/bin/gcc-ar"
ranlib = "/usr/bin/gcc-ranlib"
llvm-config = "/usr/bin/llvm-config"
END

  if [[ $CARCH == armv7h ]]; then
    mkdir path
    ln -s /usr/bin/g++ path/arm-linux-gnueabihf-g++
    export PATH="$srcdir/path:$PATH"
  fi
  if [[ $CARCH == armv7h || $CARCH == armv6h ]]; then
    jobs="-j 2"
  fi
}

_pick() {
  local p="$1" f d; shift
  for f; do
    d="$srcdir/$p/$f"
    mkdir -p "$(dirname "$d")"
    mv "$f" "$d"
    rmdir -p --ignore-fail-on-non-empty "$(dirname "$f")"
  done
}

build() {
  cd rustc-$pkgver-src

  [[ $CARCH == "aarch64" ]] && export JEMALLOC_SYS_WITH_LG_PAGE=16
  export RUST_BACKTRACE=1

  DESTDIR="$srcdir/dest-rust" python ./x.py install -j "$(nproc)"

  cd ../dest-rust

  # delete unnecessary files, e.g. files only used for the uninstall script
  rm usr/bin/*.old
  rm usr/lib/rustlib/{components,install.log,rust-installer-version,uninstall.sh}
  rm usr/lib/rustlib/manifest-*

  # rustbuild always installs copies of the shared libraries to /usr/lib,
  # overwrite them with symlinks to the per-architecture versions
  #mkdir -p usr/lib32
  #ln -srft usr/lib   usr/lib/rustlib/x86_64-unknown-linux-gnu/lib/*.so
  #ln -srft usr/lib32 usr/lib/rustlib/i686-unknown-linux-gnu/lib/*.so

  mkdir -p usr/share/licenses/rust
  mv -t usr/share/licenses/rust usr/share/doc/rust/{COPYRIGHT,LICENSE*}

  #_pick dest-i686 usr/lib/rustlib/i686-unknown-linux-gnu usr/lib32
  #_pick dest-musl usr/lib/rustlib/x86_64-unknown-linux-musl
  #_pick dest-wasm usr/lib/rustlib/wasm32-*
  _pick dest-src  usr/lib/rustlib/src
}

package_rust() {
  optdepends=(
    'gdb: rust-gdb script'
    'lldb: rust-lldb script'
  )
  provides=(
    cargo
    rustfmt
  )
  conflicts=(
    cargo
    'rust-docs<1:1.56.1-3'
    rustfmt
  )
  replaces=(
    cargo
    cargo-tree
    'rust-docs<1:1.56.1-3'
    rustfmt
  )

  cp -a dest-rust/* "$pkgdir"
}

package_rust-src() {
  pkgdesc="Source code for the Rust standard library"
  depends=(rust)

  cp -a dest-src/* "$pkgdir"

  mkdir -p "$pkgdir/usr/share/licenses"
  ln -s rust "$pkgdir/usr/share/licenses/$pkgname"
}

# vim:set ts=2 sw=2 et: