Bug 1562953 - update cctools-port; r=mshal

We need a fix from `cctools-port` master for cross-language LTO builds
to work properly on the Mac.  Rather than cherry-picking yet another
commit, which would have to deal with a updated `ld64` upstream, we've
opted to go ahead and update directly to upstream.

This choice brings about some significant build changes, as TAPI support
has moved to a different library that is not easily buildable directly.

Differential Revision: https://phabricator.services.mozilla.com/D36636

--HG--
extra : moz-landing-system : lando

taskcluster/ci/toolchain/cctools-port.yml

@@ -19,3 +19,4 @@ linux64-cctools-port:
         toolchain-artifact: public/build/cctools.tar.xz
     toolchains:
         - linux64-clang-8
+        - linux64-binutils

taskcluster/scripts/misc/build-cctools-port.sh

@@ -13,36 +13,91 @@ UPLOAD_DIR=$HOME/artifacts
 
 # Repository info
 : CROSSTOOL_PORT_REPOSITORY    ${CROSSTOOL_PORT_REPOSITORY:=https://github.com/tpoechtrager/cctools-port}
-: CROSSTOOL_PORT_REV           ${CROSSTOOL_PORT_REV:=8e9c3f2506b51cf56725eaa60b6e90e240e249ca}
+: CROSSTOOL_PORT_REV           ${CROSSTOOL_PORT_REV:=3f979bbcd7ee29d79fb93f829edf3d1d16441147}
+: LIBTAPI_REPOSITORY           ${LIBTAPI_REPOSITORY:=https://github.com/tpoechtrager/apple-libtapi}
+: LIBTAPI_REV                  ${LIBTAPI_REV:=3efb201881e7a76a21e0554906cf306432539cef}
 
-# Set some crosstools-port directories
+# Set some crosstools-port and libtapi directories
 CROSSTOOLS_SOURCE_DIR=$WORKSPACE/crosstools-port
 CROSSTOOLS_CCTOOLS_DIR=$CROSSTOOLS_SOURCE_DIR/cctools
 CROSSTOOLS_BUILD_DIR=$WORKSPACE/cctools
+LIBTAPI_SOURCE_DIR=$WORKSPACE/apple-libtapi
+LIBTAPI_BUILD_DIR=$WORKSPACE/libtapi-build
 CLANG_DIR=$WORKSPACE/build/src/clang
 
 # Create our directories
-mkdir -p $CROSSTOOLS_BUILD_DIR
+mkdir -p $CROSSTOOLS_BUILD_DIR $LIBTAPI_BUILD_DIR
 
-git clone --no-checkout $CROSSTOOL_PORT_REPOSITORY $CROSSTOOLS_SOURCE_DIR
+# Check for checkouts first to make interactive usage on taskcluster nicer.
+if [ ! -d $CROSSTOOLS_SOURCE_DIR ]; then
+    git clone --no-checkout $CROSSTOOL_PORT_REPOSITORY $CROSSTOOLS_SOURCE_DIR
+fi
 cd $CROSSTOOLS_SOURCE_DIR
 git checkout $CROSSTOOL_PORT_REV
-# Cherry pick two fixes for LTO.
-git cherry-pick -n 82381f5038a340025ae145745ae5b325cd1b749a
-git cherry-pick -n 328c7371008a854af30823adcd4ec1e763054a1d
-echo "Building from commit hash `git rev-parse $CROSSTOOL_PORT_REV`..."
+echo "Building cctools from commit hash `git rev-parse $CROSSTOOL_PORT_REV`..."
+
+if [ ! -d $LIBTAPI_SOURCE_DIR ]; then
+    git clone --no-checkout $LIBTAPI_REPOSITORY $LIBTAPI_SOURCE_DIR
+fi
+cd $LIBTAPI_SOURCE_DIR
+git checkout $LIBTAPI_REV
+echo "Building libtapi from commit hash `git rev-parse $LIBTAPI_REV`..."
 
 # Fetch clang from tooltool
 cd $WORKSPACE/build/src
 . taskcluster/scripts/misc/tooltool-download.sh
 
-# Configure crosstools-port
-cd $CROSSTOOLS_CCTOOLS_DIR
+export PATH="$WORKSPACE/build/src/binutils/bin:$PATH"
+
+# Common setup for libtapi and cctools
 export CC=$CLANG_DIR/bin/clang
 export CXX=$CLANG_DIR/bin/clang++
-export LDFLAGS="-lpthread -Wl,-rpath-link,$CLANG_DIR/lib"
+# TODO: bug 1357317 to avoid the LD_LIBRARY_PATH.
+# We also need this LD_LIBRARY_PATH at build time, since tapi builds bits of
+# clang build tools, and then executes those tools.
+export LD_LIBRARY_PATH=$CLANG_DIR/lib
+
+# Build libtapi; the included build.sh is not sufficient for our purposes.
+cd $LIBTAPI_BUILD_DIR
+
+# Values taken from build.sh
+TAPI_REPOSITORY=tapi-1000.10.8
+TAPI_VERSION=10.0.0
+
+INCLUDE_FIX="-I $LIBTAPI_SOURCE_DIR/src/llvm/projects/clang/include -I $PWD/projects/clang/include"
+
+cmake $LIBTAPI_SOURCE_DIR/src/llvm \
+      -GNinja \
+      -DCMAKE_CXX_FLAGS="$INCLUDE_FIX" \
+      -DLLVM_INCLUDE_TESTS=OFF \
+      -DCMAKE_BUILD_TYPE=RELEASE \
+      -DCMAKE_INSTALL_PREFIX=$CROSSTOOLS_BUILD_DIR \
+      -DLLVM_TARGETS_TO_BUILD="X86;ARM;AArch64" \
+      -DTAPI_REPOSITORY_STRING=$TAPI_REPOSITORY \
+      -DTAPI_FULL_VERSION=$TAPI_VERSION
+
+ninja clangBasic
+ninja libtapi install-libtapi install-tapi-headers
+
+# Setup LDFLAGS late so run-at-build-time tools in the basic clang build don't
+# pick up the possibly-incompatible libstdc++ from clang.
+# Also set it up such that loading libtapi doesn't require a LD_LIBRARY_PATH.
+# (this requires two dollars and extra backslashing because it's used verbatim
+# via a Makefile)
+export LDFLAGS="-lpthread -Wl,-rpath-link,$CLANG_DIR/lib -Wl,-rpath,\\\$\$ORIGIN/../lib"
+
+# Configure crosstools-port
+cd $CROSSTOOLS_CCTOOLS_DIR
+# Force re-libtoolization to overwrite files with the new libtool bits.
+perl -pi -e 's/(LIBTOOLIZE -c)/\1 -f/' autogen.sh
 ./autogen.sh
-./configure --prefix=$CROSSTOOLS_BUILD_DIR --target=x86_64-apple-darwin --with-llvm-config=$CLANG_DIR/bin/llvm-config
+./configure \
+    --prefix=$CROSSTOOLS_BUILD_DIR \
+    --target=x86_64-apple-darwin \
+    --with-llvm-config=$CLANG_DIR/bin/llvm-config \
+    --enable-lto-support \
+    --enable-tapi-support \
+    --with-libtapi=$CROSSTOOLS_BUILD_DIR
 
 # Build cctools
 make -j `nproc --all` install