Add support for cross-compiling for ppc64le platform

buildscripts/kokoro/linux_artifacts.sh

@@ -49,3 +49,7 @@ cp -r "$LOCAL_MVN_TEMP"/* "$MVN_ARTIFACT_DIR"/
 # for aarch64 platform
 sudo apt-get install -y g++-aarch64-linux-gnu
 SKIP_TESTS=true ARCH=aarch_64 "$GRPC_JAVA_DIR"/buildscripts/kokoro/unix.sh
+
+# for ppc64le platform
+sudo apt-get install -y g++-powerpc64le-linux-gnu
+SKIP_TESTS=true ARCH=ppcle_64 "$GRPC_JAVA_DIR"/buildscripts/kokoro/unix.sh

buildscripts/kokoro/unix.sh

@@ -9,6 +9,8 @@
 #  ARCH=x86_32 ./buildscripts/kokoro/unix.sh
 # For aarch64 arch:
 #  ARCH=aarch_64 ./buildscripts/kokoro/unix.sh
+# For ppc64le arch:
+#  ARCH=ppcle_64 ./buildscripts/kokoro/unix.sh
 
 # This script assumes `set -e`. Removing it may lead to undefined behavior.
 set -exu -o pipefail
@@ -86,7 +88,7 @@ fi
 LOCAL_MVN_TEMP=$(mktemp -d)
 # Note that this disables parallel=true from GRADLE_FLAGS
 if [[ -z "${ALL_ARTIFACTS:-}" ]]; then
-  if [[ $ARCH == "aarch_64" ]]; then
+  if [[ "$ARCH" = "aarch_64" || "$ARCH" = "ppcle_64" ]]; then
     GRADLE_FLAGS+=" -x grpc-compiler:generateTestProto -x grpc-compiler:generateTestLiteProto"
     GRADLE_FLAGS+=" -x grpc-compiler:testGolden -x grpc-compiler:testLiteGolden"
     GRADLE_FLAGS+=" -x grpc-compiler:testDeprecatedGolden -x grpc-compiler:testDeprecatedLiteGolden"

buildscripts/kokoro/upload_artifacts.sh

@@ -34,6 +34,9 @@ LOCAL_OTHER_ARTIFACTS="$KOKORO_GFILE_DIR"/github/grpc-java/artifacts/
 # for linux aarch64 platform
 [[ "$(find "$LOCAL_MVN_ARTIFACTS" -type f -iname 'protoc-gen-grpc-java-*-linux-aarch_64.exe' | wc -l)" != '0' ]]
 
+# for linux ppc64le platform
+[[ "$(find "$LOCAL_MVN_ARTIFACTS" -type f -iname 'protoc-gen-grpc-java-*-linux-ppcle_64.exe' | wc -l)" != '0' ]]
+
 # from macos job:
 [[ "$(find "$LOCAL_MVN_ARTIFACTS" -type f -iname 'protoc-gen-grpc-java-*-osx-x86_64.exe' | wc -l)" != '0' ]]
 # copy all x86 artifacts to aarch until native artifacts are built

buildscripts/make_dependencies.sh

@@ -36,6 +36,8 @@ else
       --prefix="$INSTALL_DIR"
   elif [[ "$ARCH" == aarch* ]]; then
     ./configure --disable-shared --host=aarch64-linux-gnu --prefix="$INSTALL_DIR"
+  elif [[ "$ARCH" == ppc* ]]; then
+    ./configure --disable-shared --host=powerpc64le-linux-gnu --prefix="$INSTALL_DIR"
   fi
   # the same source dir is used for 32 and 64 bit builds, so we need to clean stale data first
   make clean

compiler/build.gradle

@@ -50,7 +50,10 @@ model {
             }
         }
         gcc(Gcc) {
-            target("ppcle_64")
+            target("ppcle_64") {
+                cppCompiler.executable = 'powerpc64le-linux-gnu-g++'
+                linker.executable = 'powerpc64le-linux-gnu-g++'
+            }
             target("aarch_64") {
                 cppCompiler.executable = 'aarch64-linux-gnu-g++'
                 linker.executable = 'aarch64-linux-gnu-g++'

compiler/check-artifact.sh

@@ -61,6 +61,10 @@ checkArch ()
         assertEq "$format" "elf64-x86-64" $LINENO
       elif [[ "$ARCH" == aarch_64 ]]; then
         assertEq "$format" "elf64-little" $LINENO
+      elif [[ "$ARCH" == ppcle_64 ]]; then
+        format="$(powerpc64le-linux-gnu-objdump -f "$1" | grep -o "file format .*$" | grep -o "[^ ]*$")"
+        echo Format=$format
+        assertEq "$format" "elf64-powerpcle" $LINENO
       else
         fail "Unsupported arch: $ARCH"
       fi
@@ -108,6 +112,9 @@ checkDependencies ()
     elif [[ "$ARCH" == aarch_64 ]]; then
       dump_cmd='aarch64-linux-gnu-objdump -x '"$1"' |grep "NEEDED"'
       white_list="linux-vdso\.so\.1\|libpthread\.so\.0\|libm\.so\.6\|libc\.so\.6\|ld-linux-aarch64\.so\.1"
+    elif [[ "$ARCH" == ppcle_64 ]]; then
+      dump_cmd='powerpc64le-linux-gnu-objdump -x '"$1"' |grep "NEEDED"'
+      white_list="linux-vdso64\.so\.1\|libpthread\.so\.0\|libm\.so\.6\|libc\.so\.6\|ld64\.so\.2"
     fi
   elif [[ "$OS" == osx ]]; then
     dump_cmd='otool -L '"$1"' | fgrep dylib'