try using LLVM 18 on macOS (#12727)

Co-authored-by: Jarred-Sumner <Jarred-Sumner@users.noreply.github.com>
2026-02-02 15:08:46 +00:00 · 2024-07-22 20:44:29 -07:00
parent a6b5543bd8
commit 6e9b592c56
8 changed files with 104 additions and 68 deletions
--- a/.github/workflows/build-darwin.yml
+++ b/.github/workflows/build-darwin.yml
@@ -27,11 +27,12 @@ on:
        type: boolean

 env:
-  LLVM_VERSION: 16
+  LLVM_VERSION: 18
  BUN_VERSION: 1.1.8
  LC_CTYPE: "en_US.UTF-8"
  LC_ALL: "en_US.UTF-8"
-  BUN_ENABLE_LTO: "1"
+  # LTO is disabled because we cannot use lld on macOS currently
+  BUN_ENABLE_LTO: "0"

 jobs:
  build-submodules:
@@ -54,16 +55,7 @@ jobs:
            cat $(echo scripts/build*.sh scripts/all-dependencies.sh | tr " " "\n" | sort)
          }
          echo "hash=$(print_versions | shasum)" >> $GITHUB_OUTPUT
-      - if: ${{ !inputs.no-cache }}
-        name: Restore Cache
-        id: cache
-        uses: actions/cache/restore@v4
-        with:
-          path: ${{ runner.temp }}/bun-deps
-          key: bun-${{ inputs.tag }}-deps-${{ steps.hash.outputs.hash }}
-      # TODO: Figure out how to cache homebrew dependencies
-      - if: ${{ inputs.no-cache || !steps.cache.outputs.cache-hit }}
-        name: Install Dependencies
+      - name: Install Dependencies
        env:
          HOMEBREW_NO_INSTALLED_DEPENDENTS_CHECK: 1
          HOMEBREW_NO_AUTO_UPDATE: 1
@@ -87,24 +79,16 @@ jobs:
          echo "$(brew --prefix coreutils)/libexec/gnubin" >> $GITHUB_PATH
          echo "$(brew --prefix llvm@$LLVM_VERSION)/bin" >> $GITHUB_PATH
          brew link --overwrite llvm@$LLVM_VERSION
-      - if: ${{ inputs.no-cache || !steps.cache.outputs.cache-hit }}
-        name: Clone Submodules
+      - name: Clone Submodules
        run: |
          ./scripts/update-submodules.sh
      - name: Build Submodules
-        if: ${{ inputs.no-cache || !steps.cache.outputs.cache-hit }}
        env:
          CPU_TARGET: ${{ inputs.cpu }}
          BUN_DEPS_OUT_DIR: ${{ runner.temp }}/bun-deps
        run: |
          mkdir -p $BUN_DEPS_OUT_DIR
          ./scripts/all-dependencies.sh
-      - name: Save Cache
-        if: ${{ inputs.no-cache || !steps.cache.outputs.cache-hit }}
-        uses: actions/cache/save@v4
-        with:
-          path: ${{ runner.temp }}/bun-deps
-          key: ${{ steps.cache.outputs.cache-primary-key }}
      - name: Upload bun-${{ inputs.tag }}-deps
        uses: actions/upload-artifact@v4
        with:
@@ -148,14 +132,6 @@ jobs:
        uses: ./.github/actions/setup-bun
        with:
          bun-version: ${{ env.BUN_VERSION }}
-      - if: ${{ !inputs.no-cache }}
-        name: Restore Cache
-        uses: actions/cache@v4
-        with:
-          path: ${{ runner.temp }}/ccache
-          key: bun-${{ inputs.tag }}-cpp-${{ hashFiles('Dockerfile', 'Makefile', 'CMakeLists.txt', 'build.zig', 'scripts/**', 'src/**', 'packages/bun-usockets/src/**', 'packages/bun-uws/src/**') }}
-          restore-keys: |
-            bun-${{ inputs.tag }}-cpp-
      - name: Compile
        env:
          CPU_TARGET: ${{ inputs.cpu }}
@@ -245,18 +221,9 @@ jobs:
        with:
          name: bun-${{ inputs.tag }}-zig
          path: ${{ runner.temp }}/release
-      - if: ${{ !inputs.no-cache }}
-        name: Restore Cache
-        uses: actions/cache@v4
-        with:
-          path: ${{ runner.temp }}/ccache
-          key: bun-${{ inputs.tag }}-cpp-${{ hashFiles('Dockerfile', 'Makefile', 'CMakeLists.txt', 'build.zig', 'scripts/**', 'src/**', 'packages/bun-usockets/src/**', 'packages/bun-uws/src/**') }}
-          restore-keys: |
-            bun-${{ inputs.tag }}-cpp-
      - name: Link
        env:
          CPU_TARGET: ${{ inputs.cpu }}
-          CCACHE_DIR: ${{ runner.temp }}/ccache
        run: |
          SRC_DIR=$PWD
          mkdir ${{ runner.temp }}/link-build
--- a/.gitignore
+++ b/.gitignore
@@ -145,3 +145,4 @@ zig-cache
 zig-out
 test/node.js/upstream
 .zig-cache
+scripts/env.local
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -4,7 +4,7 @@ cmake_policy(SET CMP0067 NEW)

 set(CMAKE_POLICY_DEFAULT_CMP0069 NEW)
 set(Bun_VERSION "1.1.21")
-set(WEBKIT_TAG 2be773eeea48c03a4fa92c170934eb2220666809)
+set(WEBKIT_TAG 49907bff8781719bc2ded068b0c934f6d0074d1e)

 set(BUN_WORKDIR "${CMAKE_CURRENT_BINARY_DIR}")
 message(STATUS "Configuring Bun ${Bun_VERSION} in ${BUN_WORKDIR}")
@@ -116,7 +116,7 @@ endif()
 # we do some extra work afterwards to double-check, and we will rerun BUN_FIND_LLVM if the compiler did not match.
 #
 # If the user passes -DLLVM_PREFIX, most of this logic is skipped, but we still warn if invalid.
-if(WIN32)
+if(WIN32 OR APPLE)
    set(LLVM_VERSION 18)
 else()
    set(LLVM_VERSION 16)
@@ -154,11 +154,12 @@ macro(BUN_FIND_LLVM)
        PATHS ENV PATH ${PLATFORM_LLVM_SEARCH_PATHS}
        DOC "Path to LLVM ${LLVM_VERSION}'s llvm-strip binary"
    )
+
    find_program(
        STRIP
        NAMES strip
        PATHS ENV PATH ${PLATFORM_LLVM_SEARCH_PATHS}
-        DOC "Path to LLVM ${LLVM_VERSION}'s llvm-strip binary"
+        DOC "Path to strip binary"
    )
    find_program(
        DSYMUTIL
@@ -330,6 +331,11 @@ option(USE_STATIC_LIBATOMIC "Statically link libatomic, requires the presence of

 option(USE_LTO "Enable Link-Time Optimization" ${DEFAULT_LTO})

+if(APPLE AND USE_LTO)
+    set(USE_LTO OFF)
+    message(WARNING "Link-Time Optimization is not supported on macOS because it requires -fuse-ld=lld and lld causes many segfaults on macOS (likely related to stack size)")
+endif()
+
 if(WIN32 AND USE_LTO)
    set(CMAKE_LINKER_TYPE LLD)
    set(CMAKE_INTERPROCEDURAL_OPTIMIZATION OFF)
--- a/scripts/build-zlib.sh
+++ b/scripts/build-zlib.sh
@@ -4,10 +4,9 @@ source $(dirname -- "${BASH_SOURCE[0]}")/env.sh

 mkdir -p $BUN_DEPS_OUT_DIR
 cd $BUN_DEPS_DIR/zlib
-export CFLAGS="-O3"
-if [[ $(uname -s) == 'Darwin' ]]; then
-  export CFLAGS="$CFLAGS -mmacosx-version-min=${CMAKE_OSX_DEPLOYMENT_TARGET}"
-fi
-CFLAGS="${CFLAGS}" ./configure --static
-make -j${CPUS} libz.a
+rm -rf build
+mkdir build
+cd build
+cmake $CMAKE_FLAGS -G Ninja -DCMAKE_BUILD_TYPE=Release ..
+ninja
 cp ./libz.a $BUN_DEPS_OUT_DIR/libz.a
--- a/scripts/env.sh
+++ b/scripts/env.sh
@@ -7,6 +7,12 @@ if [[ "${CI:-}" == "1" || "${CI:-}" == "true" ]]; then
  fi
 fi

+if [[ $(uname -s) == 'Darwin' ]]; then
+  export LLVM_VERSION=18
+else
+  export LLVM_VERSION=16
+fi
+
 # this is the environment script for building bun's dependencies
 # it sets c compiler and flags
 export SCRIPT_DIR=$(cd -- "$(dirname -- "${BASH_SOURCE[0]}")" &>/dev/null && pwd)
@@ -18,26 +24,42 @@ export BUN_DEPS_OUT_DIR=${BUN_DEPS_OUT_DIR:-$BUN_BASE_DIR/build/bun-deps}
 export LC_CTYPE="en_US.UTF-8"
 export LC_ALL="en_US.UTF-8"

+if [[ "$CI" != "1" && "$CI" != "true" ]]; then
+  if [ -f $SCRIPT_DIR/env.local ]; then
+    echo "Sourcing $SCRIPT_DIR/env.local"
+    source $SCRIPT_DIR/env.local
+  fi
+elif [[ $(uname -s) == 'Darwin' ]]; then
+  export CXX="$(brew --prefix llvm)@$LLVM_VERSION/bin/clang++"
+  export CC="$(brew --prefix llvm)@$LLVM_VERSION/bin/clang"
+  export AR="$(brew --prefix llvm)@$LLVM_VERSION/bin/llvm-ar"
+  export RANLIB="$(brew --prefix llvm)@$LLVM_VERSION/bin/llvm-ranlib"
+  export LIBTOOL="$(brew --prefix llvm)@$LLVM_VERSION/bin/llvm-libtool-darwin"
+  export PATH="$(brew --prefix llvm)@$LLVM_VERSION/bin:$PATH"
+  ln -sf $LIBTOOL "$(brew --prefix llvm)@$LLVM_VERSION/bin/libtool" || true
+fi
+
 # this compiler detection could be better
-export CC=${CC:-$(which clang-16 || which clang || which cc)}
-export CXX=${CXX:-$(which clang++-16 || which clang++ || which c++)}
+export CC=${CC:-$(which clang-$LLVM_VERSION || which clang || which cc)}
+export CXX=${CXX:-$(which clang++-$LLVM_VERSION || which clang++ || which c++)}
 export AR=${AR:-$(which llvm-ar || which ar)}
 export CPUS=${CPUS:-$(nproc || sysctl -n hw.ncpu || echo 1)}
-export RANLIB=${RANLIB:-$(which llvm-ranlib-16 || which llvm-ranlib || which ranlib)}
+export RANLIB=${RANLIB:-$(which llvm-ranlib-$LLVM_VERSION || which llvm-ranlib || which ranlib)}

 # on Linux, force using lld as the linker
 if [[ $(uname -s) == 'Linux' ]]; then
-  export LD=${LD:-$(which ld.lld-16 || which ld.lld || which ld)}
+  export LD=${LD:-$(which ld.lld-$LLVM_VERSION || which ld.lld || which ld)}
  export LDFLAGS="${LDFLAGS} -fuse-ld=lld "
 fi

 export CMAKE_CXX_COMPILER=${CXX}
 export CMAKE_C_COMPILER=${CC}

-export CFLAGS='-O3 -fno-exceptions -fvisibility=hidden -fvisibility-inlines-hidden -mno-omit-leaf-frame-pointer -fno-omit-frame-pointer -fno-asynchronous-unwind-tables -fno-unwind-tables -faddrsig  '
-export CXXFLAGS='-O3 -fno-exceptions -fno-rtti -fvisibility=hidden -fvisibility-inlines-hidden -mno-omit-leaf-frame-pointer -fno-omit-frame-pointer -fno-asynchronous-unwind-tables -fno-unwind-tables -faddrsig -fno-c++-static-destructors '
+export CFLAGS='-O3 -fno-exceptions -fvisibility=hidden -fvisibility-inlines-hidden -mno-omit-leaf-frame-pointer -fno-omit-frame-pointer -fno-asynchronous-unwind-tables -fno-unwind-tables  '
+export CXXFLAGS='-O3 -fno-exceptions -fno-rtti -fvisibility=hidden -fvisibility-inlines-hidden -mno-omit-leaf-frame-pointer -fno-omit-frame-pointer -fno-asynchronous-unwind-tables -fno-unwind-tables -fno-c++-static-destructors '

 # Add flags for LTO
+# We cannot enable LTO on macOS for dependencies because it requires -fuse-ld=lld and lld causes many segfaults on macOS (likely related to stack size)
 if [ "$BUN_ENABLE_LTO" == "1" ]; then
  export CFLAGS="$CFLAGS -flto=full "
  export CXXFLAGS="$CXXFLAGS -flto=full -fwhole-program-vtables -fforce-emit-vtables "
@@ -45,16 +67,23 @@ if [ "$BUN_ENABLE_LTO" == "1" ]; then
 fi

 if [[ $(uname -s) == 'Linux' ]]; then
-  export CFLAGS="$CFLAGS -ffunction-sections -fdata-sections"
-  export CXXFLAGS="$CXXFLAGS -ffunction-sections -fdata-sections"
+  export CFLAGS="$CFLAGS -ffunction-sections -fdata-sections -faddrsig "
+  export CXXFLAGS="$CXXFLAGS -ffunction-sections -fdata-sections -faddrsig "
  export LDFLAGS="${LDFLAGS} -Wl,-z,norelro"
 fi

+# Clang 18 on macOS needs to have -fno-define-target-os-macros to fix a zlib build issue
+# https://gitlab.kitware.com/cmake/cmake/-/issues/25755
+if [[ $(uname -s) == 'Darwin' && $LLVM_VERSION == '18' ]]; then
+  export CFLAGS="$CFLAGS -fno-define-target-os-macros "
+  export CXXFLAGS="$CXXFLAGS -fno-define-target-os-macros "
+fi
+
 # libarchive needs position-independent executables to compile successfully
 if [ -n "$FORCE_PIC" ]; then
  export CFLAGS="$CFLAGS -fPIC "
  export CXXFLAGS="$CXXFLAGS -fPIC "
-else
+elif [[ $(uname -s) == 'Linux' ]]; then
  export CFLAGS="$CFLAGS -fno-pie -fno-pic "
  export CXXFLAGS="$CXXFLAGS -fno-pie -fno-pic "
 fi
--- a/scripts/setup.sh
+++ b/scripts/setup.sh
@@ -15,12 +15,35 @@ fail() {
  printf "${C_RED}setup error${C_RESET}: %s\n" "$@"
 }

-LLVM_VERSION=16
+if [[ $(uname -s) == 'Darwin' ]]; then
+  export LLVM_VERSION=18

-# this compiler detection could be better
-# it is copy pasted from ./env.sh
-CC=${CC:-$(which clang-16 || which clang || which cc)}
-CXX=${CXX:-$(which clang++-16 || which clang++ || which c++)}
+  # Use from brew --prefix if available
+  if has_exec brew; then
+    export PKG_CONFIG_PATH=$(brew --prefix)/lib/pkgconfig:$PKG_CONFIG_PATH
+
+    # if llvm@18/bin/clang exists, use it
+    if [ -x "$(brew --prefix)/opt/llvm@$LLVM_VERSION/bin/clang" ]; then
+      export PATH=$(brew --prefix)/opt/llvm@$LLVM_VERSION/bin:$PATH
+      export CC=$(brew --prefix)/opt/llvm@$LLVM_VERSION/bin/clang
+      export CXX=$(brew --prefix)/opt/llvm@$LLVM_VERSION/bin/clang++
+      export AR=$(brew --prefix)/opt/llvm@$LLVM_VERSION/bin/llvm-ar
+    else
+      export CC=$(which clang-$LLVM_VERSION || which clang || which cc)
+      export CXX=$(which clang++-$LLVM_VERSION || which clang++ || which c++)
+      export AR=$(which llvm-ar-$LLVM_VERSION || which llvm-ar || which ar)
+    fi
+  fi
+
+  test -n "$CC" || fail "missing LLVM $LLVM_VERSION (could not find clang)"
+  test -n "$CXX" || fail "missing LLVM $LLVM_VERSION (could not find clang++)"
+else
+  export LLVM_VERSION=16
+
+  export CC=$(which clang-$LLVM_VERSION || which clang || which cc)
+  export CXX=$(which clang++-$LLVM_VERSION || which clang++ || which c++)
+  export AR=$(which llvm-ar-$LLVM_VERSION || which llvm-ar || which ar)
+fi

 test -n "$CC" || fail "missing LLVM $LLVM_VERSION (could not find clang)"
 test -n "$CXX" || fail "missing LLVM $LLVM_VERSION (could not find clang++)"
@@ -36,9 +59,9 @@ has_exec "bun" || fail "you need an existing copy of 'bun' in your path to build
 has_exec "cmake" || fail "'cmake' is missing"
 has_exec "ninja" || fail "'ninja' is missing"
 $(
-  has_exec "rustc" \
-  && (test $(cargo --version | awk '{print $2}' | cut -d. -f2) -gt 57) \
-  && has_exec "cargo"
+  has_exec "rustc" &&
+    (test $(cargo --version | awk '{print $2}' | cut -d. -f2) -gt 57) &&
+    has_exec "cargo"
 ) || fail "Rust and Cargo version must be installed (minimum version 1.57)"
 has_exec "go" || fail "'go' is missing"

@@ -59,6 +82,15 @@ printf "C Compiler for dependencies: ${CC}\n"
 printf "C++ Compiler for dependencies: ${CXX}\n"

 cd "$(dirname "${BASH_SOURCE[0]}")"
+
+rm -rf env.local
+echo "# Environment variables as of last setup.sh run at $(date)" >env.local
+echo "export CC=\"${CC}\"" >>env.local
+echo "export CXX\"=${CXX}\"" >>env.local
+echo "export AR=\"${AR}\"" >>env.local
+echo "export PATH=\"${PATH}\"" >>env.local
+echo "Saved environment variables to $(pwd)/env.local"
+
 bash ./update-submodules.sh
 bash ./all-dependencies.sh

@@ -67,7 +99,9 @@ cd ../
 # Install bun dependencies
 bun i
 # Install test dependencies
-cd test; bun i; cd ..
+cd test
+bun i
+cd ..

 # TODO(@paperdave): do not use the Makefile please
 has_exec "make" || fail "'make' is missing"
@@ -81,7 +115,7 @@ cmake -B build -S . \
  -DCMAKE_BUILD_TYPE=Debug \
  -DCMAKE_C_COMPILER="$CC" \
  -DCMAKE_CXX_COMPILER="$CXX" \
-  -UZIG_COMPILER "$*" \
+  -UZIG_COMPILER "$*"

 ninja -C build

--- a/src/bun.js/bindings/bindings.cpp
+++ b/src/bun.js/bindings/bindings.cpp
@@ -5560,7 +5560,7 @@ extern "C" EncodedJSValue JSC__JSValue__dateInstanceFromNullTerminatedString(JSC
 // this is largely copied from dateProtoFuncToISOString
 extern "C" int JSC__JSValue__toISOString(JSC::JSGlobalObject* globalObject, EncodedJSValue dateValue, char* buf)
 {
-    char buffer[28];
+    char buffer[29];
    JSC::DateInstance* thisDateObj = JSC::jsDynamicCast<JSC::DateInstance*>(JSC::JSValue::decode(dateValue));
    if (!thisDateObj)
        return -1;
--- a/src/generated_versions_list.zig
+++ b/src/generated_versions_list.zig
@@ -4,7 +4,7 @@ pub const boringssl = "29a2cd359458c9384694b75456026e4b57e3e567";
 pub const libarchive = "898dc8319355b7e985f68a9819f182aaed61b53a";
 pub const mimalloc = "4c283af60cdae205df5a872530c77e2a6a307d43";
 pub const picohttpparser = "066d2b1e9ab820703db0837a7255d92d30f0c9f5";
-pub const webkit = "2be773eeea48c03a4fa92c170934eb2220666809";
+pub const webkit = "49907bff8781719bc2ded068b0c934f6d0074d1e";
 pub const zig = @import("std").fmt.comptimePrint("{}", .{@import("builtin").zig_version});
 pub const zlib = "886098f3f339617b4243b286f5ed364b9989e245";
 pub const tinycc = "ab631362d839333660a265d3084d8ff060b96753";