From 7d662efb2be378b9eb3b44e981f176949dd37b43 Mon Sep 17 00:00:00 2001 From: Matt Corallo Date: Tue, 30 Nov 2021 16:19:08 +0000 Subject: [PATCH] Support cross-language LTO on OSX (with upstream clang/lld) --- .../clang-lto-link-osx | 15 +++++++++ genbindings.sh | 32 ++++++++++++------- 2 files changed, 36 insertions(+), 11 deletions(-) create mode 100755 deterministic-build-wrappers/clang-lto-link-osx diff --git a/deterministic-build-wrappers/clang-lto-link-osx b/deterministic-build-wrappers/clang-lto-link-osx new file mode 100755 index 0000000..ae566d1 --- /dev/null +++ b/deterministic-build-wrappers/clang-lto-link-osx @@ -0,0 +1,15 @@ +#!/bin/sh +# We want to use rustc's -C linker-plugin-lto, but it passes several arguments +# that are not understood by OSX clang/ld64.lld. Specifically, it passes +# -plugin-opt* arguments to set optimization levels, which are not supported. +# Thus, we intercept the call here, strip the unsupported arguments, and pass +# -flto and -O3. +args=("$@") +for ((i=0; i<"${#args[@]}"; ++i)); do + case ${args[i]} in + -Wl,-plugin-opt*) + args[i]="" + ;; + esac +done +$LDK_CLANG_PATH -flto -O3 -Wl,-O3 "${args[@]}" diff --git a/genbindings.sh b/genbindings.sh index f572ccc..8d4d726 100755 --- a/genbindings.sh +++ b/genbindings.sh @@ -351,7 +351,7 @@ if [ "$HOST_PLATFORM" = "host: x86_64-apple-darwin" ]; then echo "Apple clang isn't compatible with upstream clang, install upstream clang" CLANG_LLVM_V="0" else - CLANG_LLVM_V=$(clang --version | head -n1 | awk '{ print substr($4, 0, 2); }') + CLANG_LLVM_V=$(clang --version | head -n1 | awk '{ print substr($3, 0, 2); }') if [ -x "$(which ld64.lld)" ]; then LLD_LLVM_V="$(ld64.lld --version | awk '{ print substr($2, 0, 2); }')" fi @@ -438,13 +438,13 @@ echo "C++ Bin size and runtime with only RL (LTO) optimized:" ls -lha a.out time ./a.out > /dev/null -if [ "$HOST_PLATFORM" != "host: x86_64-apple-darwin" -a "$CLANGPP" != "" ]; then +if [ "$CLANGPP" != "" ]; then # If we can use cross-language LTO, use it for building C dependencies (i.e. libsecp256k1) as well export CC="$CLANG" # The cc-rs crate tries to force -fdata-sections and -ffunction-sections on, which # breaks -fembed-bitcode, so we turn off cc-rs' default flags and specify exactly # what we want here. - export CFLAGS_$ENV_TARGET="$BASE_CFLAGS -fPIC -fembed-bitcode -march=sandybridge" + export CFLAGS_$ENV_TARGET="$BASE_CFLAGS -fPIC -fembed-bitcode -march=sandybridge -mcpu=sandybridge -mtune=sandybridge" export CRATE_CC_NO_DEFAULTS=true fi @@ -478,25 +478,35 @@ for IDX in ${!EXTRA_TARGETS[@]}; do RUSTFLAGS="$BASE_RUSTFLAGS -C linker=${EXTRA_CCS[$IDX]}" CARGO_PROFILE_RELEASE_LTO=true cargo rustc -v --release --target "${EXTRA_TARGETS[$IDX]}" -- -C lto done -if [ "$CFLAGS_aarch64_apple_darwin" != "" ]; then - RUSTFLAGS="$BASE_RUSTFLAGS -C target-cpu=apple-a14" CARGO_PROFILE_RELEASE_LTO=true cargo rustc -v --release --target aarch64-apple-darwin -- -C lto -fi - -if [ "$HOST_PLATFORM" != "host: x86_64-apple-darwin" -a "$CLANGPP" != "" -a "$LLD" != "" ]; then +if [ "$CLANGPP" != "" -a "$LLD" != "" ]; then # Finally, test cross-language LTO. Note that this will fail if rustc and clang++ # build against different versions of LLVM (eg when rustc is installed via rustup # or Ubuntu packages). This should work fine on Distros which do more involved # packaging than simply shipping the rustup binaries (eg Debian should Just Work # here). - export CFLAGS_$ENV_TARGET="$BASE_CFLAGS -O3 -fPIC -fembed-bitcode -march=sandybridge" + LINK_ARG_FLAGS="-C link-arg=-fuse-ld=$LLD" + if [ "$HOST_PLATFORM" = "host: x86_64-apple-darwin" ]; then + export LDK_CLANG_PATH=$(which $CLANG) + export CLANG="$(pwd)/../deterministic-build-wrappers/clang-lto-link-osx" + for ARG in "CFLAGS_aarch64_apple_darwin"; do + MANUAL_LINK_CFLAGS="$MANUAL_LINK_CFLAGS -C link-arg=$ARG" + done + export CFLAGS_aarch64_apple_darwin="$CFLAGS_aarch64_apple_darwin -O3 -fPIC -fembed-bitcode" + LINK_ARG_FLAGS="$LINK_ARG_FLAGS -C link-arg="-isysroot$(xcrun --show-sdk-path)" -C link-arg=-mmacosx-version-min=10.9" + RUSTFLAGS="$BASE_RUSTFLAGS -C target-cpu=apple-a14" CARGO_PROFILE_RELEASE_LTO=true cargo rustc -v --release --target aarch64-apple-darwin -- -C linker-plugin-lto -C lto -C linker=$CLANG $LINK_ARG_FLAGS -C link-arg=-mcpu=apple-a14 + fi + export CFLAGS_$ENV_TARGET="$BASE_CFLAGS -O3 -fPIC -fembed-bitcode -march=sandybridge -mcpu=sandybridge -mtune=sandybridge" # Rust doesn't recognize CFLAGS changes, so we need to clean build artifacts cargo clean --release - CARGO_PROFILE_RELEASE_LTO=true cargo rustc -v --release -- -C linker-plugin-lto -C lto -C linker=$CLANG -C link-arg=-fuse-ld=$LLD + CARGO_PROFILE_RELEASE_LTO=true cargo rustc -v --release -- -C linker-plugin-lto -C lto -C linker=$CLANG $LINK_ARG_FLAGS -C link-arg=-march=sandybridge -C link-arg=-mcpu=sandybridge -C link-arg=-mtune=sandybridge $CLANGPP $LOCAL_CFLAGS -flto -fuse-ld=lld -O2 demo.cpp target/release/libldk.a -ldl strip ./a.out echo "C++ Bin size and runtime with cross-language LTO:" ls -lha a.out time ./a.out > /dev/null else - echo "WARNING: Building with cross-language LTO is not avilable on OSX or without clang-$RUSTC_LLVM_V" + if [ "$CFLAGS_aarch64_apple_darwin" != "" ]; then + RUSTFLAGS="$BASE_RUSTFLAGS -C target-cpu=apple-a14" CARGO_PROFILE_RELEASE_LTO=true cargo rustc -v --release --target aarch64-apple-darwin -- -C lto + fi + echo "WARNING: Building with cross-language LTO is not avilable without clang-$RUSTC_LLVM_V" fi -- 2.30.2