1 files changed, 202 insertions, 0 deletions
diff --git a/nixpkgs/pkgs/build-support/rust/build-rust-crate/configure-crate.nix b/nixpkgs/pkgs/build-support/rust/build-rust-crate/configure-crate.nix
new file mode 100644
index 000000000000..8e2f5f7f35e0
--- /dev/null
+++ b/nixpkgs/pkgs/build-support/rust/build-rust-crate/configure-crate.nix
@@ -0,0 +1,202 @@
+{ lib, stdenv, echo_colored, noisily, mkRustcDepArgs, mkRustcFeatureArgs }:
+{
+  build
+, buildDependencies
+, colors
+, completeBuildDeps
+, completeDeps
+, crateAuthors
+, crateDescription
+, crateHomepage
+, crateFeatures
+, crateName
+, crateRenames
+, crateVersion
+, extraLinkFlags
+, extraRustcOpts
+, libName
+, libPath
+, release
+, target_os
+, verbose
+, workspace_member }:
+let version_ = lib.splitString "-" crateVersion;
+    versionPre = if lib.tail version_ == [] then "" else lib.elemAt version_ 1;
+    version = lib.splitVersion (lib.head version_);
+    rustcOpts = lib.foldl' (opts: opt: opts + " " + opt)
+        (if release then "-C opt-level=3" else "-C debuginfo=2")
+        (["-C codegen-units=$NIX_BUILD_CORES"] ++ extraRustcOpts);
+    buildDeps = mkRustcDepArgs buildDependencies crateRenames;
+    authors = lib.concatStringsSep ":" crateAuthors;
+    optLevel = if release then 3 else 0;
+    completeDepsDir = lib.concatStringsSep " " completeDeps;
+    completeBuildDepsDir = lib.concatStringsSep " " completeBuildDeps;
+    envFeatures = lib.concatStringsSep " " (
+      map (f: lib.replaceChars ["-"] ["_"] (lib.toUpper f)) crateFeatures
+    );
+in ''
+  ${echo_colored colors}
+  ${noisily colors verbose}
+  source ${./lib.sh}
+
+  ${lib.optionalString (workspace_member != null) ''
+  noisily cd "${workspace_member}"
+''}
+  ${lib.optionalString (workspace_member == null) ''
+  echo_colored "Searching for matching Cargo.toml (${crateName})" 
+  local cargo_toml_dir=$(matching_cargo_toml_dir "${crateName}")
+  if [ -z "$cargo_toml_dir" ]; then
+    echo_error "ERROR configuring ${crateName}: No matching Cargo.toml in $(pwd) found." >&2
+    exit 23
+  fi
+  noisily cd "$cargo_toml_dir"
+''}
+
+  runHook preConfigure
+ 
+  symlink_dependency() {
+    # $1 is the nix-store path of a dependency
+    # $2 is the target path
+    i=$1
+    ln -s -f $i/lib/*.rlib $2 #*/
+    ln -s -f $i/lib/*.so $i/lib/*.dylib $2 #*/
+    if [ -e $i/env ]; then
+        source $i/env
+    fi
+  }
+
+  # The following steps set up the dependencies of the crate. Two
+  # kinds of dependencies are distinguished: build dependencies
+  # (used by the build script) and crate dependencies. For each
+  # dependency we have to:
+  #
+  # - Make its Rust library available to rustc. This is done by
+  #   symlinking all library dependencies into a directory that
+  #   can be provided to rustc.
+  # - Accumulate linking flags. These flags are largely used for
+  #   linking native libraries.
+  #
+  # The crate link flags are added to the `link` and `link.final`
+  # files. The `link` file is used for linkage in the current
+  # crate. The `link.final` file will be copied to the output and can
+  # be used by downstream crates to get the linker flags of this
+  # crate.
+
+  mkdir -p target/{deps,lib,build,buildDeps}
+  chmod uga+w target -R
+  echo ${extraLinkFlags} > target/link
+  echo ${extraLinkFlags} > target/link.final
+
+  # Prepare crate dependencies
+  for i in ${completeDepsDir}; do
+    symlink_dependency $i target/deps
+    if [ -e "$i/lib/link" ]; then
+      cat $i/lib/link >> target/link
+      cat $i/lib/link >> target/link.final
+    fi
+  done
+
+  # Prepare crate build dependencies that are used for the build script.
+  for i in ${completeBuildDepsDir}; do
+    symlink_dependency $i target/buildDeps
+    if [ -e "$i/lib/link" ]; then
+      cat $i/lib/link >> target/link.build
+    fi
+  done
+
+  # Remove duplicate linker flags from the build dependencies.
+  if [[ -e target/link.build ]]; then
+    sort -uo target/link.build target/link.build
+  fi
+
+  # Remove duplicate linker flags from the dependencies.
+  sort -uo target/link target/link
+  tr '\n' ' ' < target/link > target/link_
+
+  # Remove duplicate linker flags from the that are written
+  # to the derivation's output.
+  sort -uo target/link.final target/link.final
+
+  EXTRA_BUILD=""
+  BUILD_OUT_DIR=""
+  export CARGO_PKG_NAME=${crateName}
+  export CARGO_PKG_VERSION=${crateVersion}
+  export CARGO_PKG_AUTHORS="${authors}"
+  export CARGO_PKG_DESCRIPTION="${crateDescription}"
+
+  export CARGO_CFG_TARGET_ARCH=${stdenv.hostPlatform.parsed.cpu.name}
+  export CARGO_CFG_TARGET_OS=${target_os}
+  export CARGO_CFG_TARGET_FAMILY="unix"
+  export CARGO_CFG_UNIX=1
+  export CARGO_CFG_TARGET_ENV="gnu"
+  export CARGO_CFG_TARGET_ENDIAN=${if stdenv.hostPlatform.parsed.cpu.significantByte.name == "littleEndian" then "little" else "big"}
+  export CARGO_CFG_TARGET_POINTER_WIDTH=${toString stdenv.hostPlatform.parsed.cpu.bits}
+  export CARGO_CFG_TARGET_VENDOR=${stdenv.hostPlatform.parsed.vendor.name}
+
+  export CARGO_MANIFEST_DIR=$(pwd)
+  export DEBUG="${toString (!release)}"
+  export OPT_LEVEL="${toString optLevel}"
+  export TARGET="${stdenv.hostPlatform.config}"
+  export HOST="${stdenv.hostPlatform.config}"
+  export PROFILE=${if release then "release" else "debug"}
+  export OUT_DIR=$(pwd)/target/build/${crateName}.out
+  export CARGO_PKG_VERSION_MAJOR=${lib.elemAt version 0}
+  export CARGO_PKG_VERSION_MINOR=${lib.elemAt version 1}
+  export CARGO_PKG_VERSION_PATCH=${lib.elemAt version 2}
+  export CARGO_PKG_VERSION_PRE="${versionPre}"
+  export CARGO_PKG_HOMEPAGE="${crateHomepage}"
+  export NUM_JOBS=1
+  export RUSTC="rustc"
+  export RUSTDOC="rustdoc"
+
+  BUILD=""
+  if [[ ! -z "${build}" ]] ; then
+     BUILD=${build}
+  elif [[ -e "build.rs" ]]; then
+     BUILD="build.rs"
+  fi
+
+  # Compile and run the build script, when available.
+  if [[ ! -z "$BUILD" ]] ; then
+     echo_build_heading "$BUILD" ${libName}
+     mkdir -p target/build/${crateName}
+     EXTRA_BUILD_FLAGS=""
+     if [ -e target/link.build ]; then
+       EXTRA_BUILD_FLAGS="$EXTRA_BUILD_FLAGS $(tr '\n' ' ' < target/link.build)"
+     fi
+     noisily rustc --crate-name build_script_build $BUILD --crate-type bin ${rustcOpts} \
+       ${mkRustcFeatureArgs crateFeatures} --out-dir target/build/${crateName} --emit=dep-info,link \
+       -L dependency=target/buildDeps ${buildDeps} --cap-lints allow $EXTRA_BUILD_FLAGS --color ${colors}
+
+     mkdir -p target/build/${crateName}.out
+     export RUST_BACKTRACE=1
+     BUILD_OUT_DIR="-L $OUT_DIR"
+     mkdir -p $OUT_DIR
+
+     (
+       # Features should be set as environment variable for build scripts:
+       # https://doc.rust-lang.org/cargo/reference/environment-variables.html#environment-variables-cargo-sets-for-build-scripts
+       for feature in ${envFeatures}; do
+         export CARGO_FEATURE_$feature=1
+       done
+
+       target/build/${crateName}/build_script_build > target/build/${crateName}.opt
+     )
+
+     set +e
+     EXTRA_BUILD=$(sed -n "s/^cargo:rustc-flags=\(.*\)/\1/p" target/build/${crateName}.opt | tr '\n' ' ' | sort -u)
+     EXTRA_FEATURES=$(sed -n "s/^cargo:rustc-cfg=\(.*\)/--cfg \1/p" target/build/${crateName}.opt | tr '\n' ' ')
+     EXTRA_LINK=$(sed -n "s/^cargo:rustc-link-lib=\(.*\)/\1/p" target/build/${crateName}.opt | tr '\n' ' ')
+     EXTRA_LINK_SEARCH=$(sed -n "s/^cargo:rustc-link-search=\(.*\)/\1/p" target/build/${crateName}.opt | tr '\n' ' ' | sort -u)
+
+     for env in $(sed -n "s/^cargo:rustc-env=\(.*\)/\1/p" target/build/${crateName}.opt); do
+       export $env
+     done
+
+     CRATENAME=$(echo ${crateName} | sed -e "s/\(.*\)-sys$/\U\1/" -e "s/-/_/g")
+     grep -P "^cargo:(?!(rustc-|warning=|rerun-if-changed=|rerun-if-env-changed))" target/build/${crateName}.opt \
+       | awk -F= "/^cargo:/ { sub(/^cargo:/, \"\", \$1); gsub(/-/, \"_\", \$1); print \"export \" toupper(\"DEP_$(echo $CRATENAME)_\" \$1) \"=\" \$2 }" > target/env
+     set -e
+  fi
+  runHook postConfigure
+''