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# 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>

pkgbase=rust162
pkgname=(rust162 rust162-musl rust162-wasm rust162-src)
epoch=1
pkgver=1.62.0
pkgrel=1
pkgdesc="Systems programming language focused on safety, speed and concurrency"
url=https://www.rust-lang.org/
arch=(i486 i686 pentium4 x86_64)
license=(MIT Apache)
options=(!emptydirs !strip !lto)
depends=(gcc-libs llvm-libs curl libssh2 gcc)
makedepends=(rust llvm libffi lib32-gcc-libs perl python cmake musl ninja
             wasi-libc lld)
checkdepends=(procps-ng gdb)
source=(
  "https://static.rust-lang.org/dist/rustc-$pkgver-src.tar.gz"{,.asc}
  0001-cargo-Change-libexec-dir.patch
  0001-bootstrap-Change-libexec-dir.patch
  0002-compiler-Change-LLVM-targets.patch
  0003-compiler-Use-wasm-ld-for-wasm-targets.patch
  remove-include-linux-fs.h.patch
)
sha256sums=('7d0878809b64d206825acae3eb7f60afb2212d81e3de1adf4c11c6032b36c027'
            'SKIP'
            'c901a9bb036c29ca092f7dbc8b447efdd9aa1044a902a88f9d024cb22681dc19'
            '7080a88e44234aa363ba6321f319c8d9621382dd9581748a43847dae005e55bd'
            '5137df0a3399e279db4c5b83ae8e99d2c1977f62aec2f90521edb02f51597064'
            '26bf232d144b81a303ed91f6a331ddf004c5d9fefd41a11e36b61812a34459aa'
            '34ed866e313e4580130a50118a4410d36fa0159123982521b6ef049439fc32ad')
validpgpkeys=(108F66205EAEB0AAA8DD5E1C85AB96E6FA1BE5FE  # Rust Language (Tag and Release Signing Key) <rust-key@rust-lang.org>
              474E22316ABF4785A88C6E8EA2C794A986419D8A) # Tom Stellard <tstellar@redhat.com>

prepare() {
  cd rustc-$pkgver-src

  # Patch bootstrap and cargo so credential helpers
  # are in /usr/lib instead of /usr/libexec
  patch -d src/tools/cargo -Np1 < ../0001-cargo-Change-libexec-dir.patch
  patch -Np1 -i ../0001-bootstrap-Change-libexec-dir.patch

  # Use our *-pc-linux-gnu targets, making LTO with clang simpler
  patch -Np1 -i ../0002-compiler-Change-LLVM-targets.patch

  # Use our wasm-ld
  patch -Np1 -i ../0003-compiler-Use-wasm-ld-for-wasm-targets.patch

  # https://github.com/llvm/llvm-project/issues/56421
  patch -Np1 -d src/llvm-project < ../remove-include-linux-fs.h.patch

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

[llvm]
link-shared = true

[build]
target = [
  "x86_64-unknown-linux-gnu",
  "i686-unknown-linux-gnu",
  "x86_64-unknown-linux-musl",
  "wasm32-unknown-unknown",
  "wasm32-wasi",
]
cargo = "/usr/bin/cargo"
rustc = "/usr/bin/rustc"
rustfmt = "/usr/bin/rustfmt"
locked-deps = true
vendor = true
tools = ["cargo", "rls", "clippy", "rustfmt", "analysis", "src", "rust-demangler"]
sanitizers = true
profiler = true

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

[install]
prefix = "/usr"

[rust]
debuginfo-level-std = 2
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]
llvm-config = "/usr/bin/llvm-config"

[target.x86_64-unknown-linux-musl]
sanitizers = false
musl-root = "/usr/lib/musl"

[target.wasm32-unknown-unknown]
sanitizers = false
profiler = false

[target.wasm32-wasi]
sanitizers = false
profiler = false
wasi-root = "/usr/share/wasi-sysroot"
END
}

_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

  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/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/bash-completion
  mv etc/bash_completion.d usr/share/bash-completion/completions

  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_rust162() {
  optdepends=('lldb: rust-lldb script'
              'gdb: rust-gdb script')
  provides=(cargo rustfmt)
  conflicts=(cargo rustfmt 'rust-docs<1:1.56.1-3')
  replaces=(cargo rustfmt cargo-tree 'rust-docs<1:1.56.1-3')

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

package_lib32-rust-libs() {
  pkgdesc="32-bit target and libraries for Rust"
  depends=(rust lib32-gcc-libs)
  provides=(lib32-rust)
  conflicts=(lib32-rust)
  replaces=(lib32-rust)

  cp -a dest-i686/* "$pkgdir"

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

package_rust162-musl() {
  pkgdesc="Musl target for Rust"
  depends=(rust162)

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

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

package_rust162-wasm() {
  pkgdesc="WebAssembly targets for Rust"
  depends=(rust162 lld)

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

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

package_rust162-src() {
  pkgdesc="Source code for the Rust standard library"
  depends=(rust162)

  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:
# enable i686-unknown-linux-gnu target
# and replace pentium4 (SSE2) with pentium3 (no SSE2) in the compiler spec file
#
# Also trying to reduce memory usage by building with
# -debuginfo-level-std=1
# see https://github.com/rust-lang/rust/issues/60294

source+=(config.toml.patch)
sha256sums+=('a8b42b5f47c0eaebafbb2cd1f39d2f944945cbb55e87d4dc21c7bd5b1b8964d8')

eval "$(
  declare -f prepare | \
    sed '
      $ i patch -p1 -i "$srcdir/config.toml.patch"
    '
)"

# stop insanity of nproc (see FS#62952)
#eval "$(
#  declare -f build | \
#    sed '
#      s/-j "$(nproc)"/-j1/
#    '
#)"

if [ "${CARCH}" != 'pentium4' ]; then
  eval "$(
    declare -f prepare | \
      sed '
        $ i sed -i "s/pentium4/pentium3/g" "$srcdir/rustc-$pkgver-src/compiler/rustc_target/src/spec/i686_unknown_linux_gnu.rs"
      '
  )"
fi

# Don't move lib32 support into rust32-lib, we are on 32-bit in the end
# and don't draw a symlink to 64-bit libraries (but to 32-bit instead)
# move rust-musl though, also patch architecture for musl accordingly
eval "$(
  declare -f build | \
    sed '
      /mkdir.*usr\/lib32/d
      /ln.*x86_64.*/d
      /ln.*i686-unknown-linux-gnu.*/d
      /_pick.*dest-i686.*/d
      s/x86_64-unknown-linux-musl/i686-unknown-linux-musl/
    '
)"

eval "$(
  declare -f package_rust | \
    sed '
      /ln /s/x86_64-unknown-linux-gnu/i686-unknown-linux-gnu/g
    '
)"

eval "$(
  declare -f package_rust-musl | \
    sed '
      s/x86_64-unknown-linux-musl/i686-unknown-linux-musl/
    '
)"

# remove 32-bit stuff (shouldn't that be removed automatically?)
pkgname=(
  $(
    printf '%s\n' "${pkgname[@]}" | \
      grep -v '^lib32-rust-libs'
  )
)
makedepends=(${makedepends[@]//lib32-gcc-libs/})

# Enable on demand, if your previous rust is broken use previous version
# from build-support (this is preferable to using rust-bin below, but
# requires all intermediate versions of rust to be built
#makedepends=(${makedepends[@]//rust/})
#makedepends+=('rust148')

# Enable on demand, if your previous rust is broken use previous version
# from build-support
#makedepends=(${makedepends[@]//rust/})
#makedepends+=('rust159-bin')

# rust 1.61 is built against llvm13.0, so force that in as a make dependency
makedepends+=('llvm13-libs')