Ensure we can compile boringssl before trying: old compiler compatibility

Allow compiling with openssl

Makefile

@@ -426,6 +426,7 @@ endif
 
 OPENSSL_ALPN_CHECK_CMD = $(CC) $(CPPFLAGS) $(CFLAGS) -o $(TMPOUT) test/build/openssl-alpn.c $(addprefix -l, $(OPENSSL_LIBS)) $(LDFLAGS)
 OPENSSL_NPN_CHECK_CMD = $(CC) $(CPPFLAGS) $(CFLAGS) -o $(TMPOUT) test/build/openssl-npn.c $(addprefix -l, $(OPENSSL_LIBS)) $(LDFLAGS)
+BORINGSSL_COMPILE_CHECK_CMD = $(CC) $(CPPFLAGS) -Ithird_party/boringssl/include -fvisibility=hidden -DOPENSSL_NO_ASM -D_GNU_SOURCE -DWIN32_LEAN_AND_MEAN -D_HAS_EXCEPTIONS=0 -DNOMINMAX $(CFLAGS) -Wno-sign-conversion -Wno-conversion -Wno-unused-value -Wno-unknown-pragmas -Wno-implicit-function-declaration -Wno-unused-variable -Wno-sign-compare -o $(TMPOUT) test/build/boringssl.c $(LDFLAGS)
 ZLIB_CHECK_CMD = $(CC) $(CPPFLAGS) $(CFLAGS) -o $(TMPOUT) test/build/zlib.c -lz $(LDFLAGS)
 PROTOBUF_CHECK_CMD = $(CXX) $(CPPFLAGS) $(CXXFLAGS) -o $(TMPOUT) test/build/protobuf.cc -lprotobuf $(LDFLAGS)
 
@@ -510,10 +511,13 @@ HAS_ZOOKEEPER = $(shell $(ZOOKEEPER_CHECK_CMD) 2> /dev/null && echo true || echo
 # Note that for testing purposes, one can do:
 #   make HAS_EMBEDDED_OPENSSL_ALPN=false
 # to emulate the fact we do not have OpenSSL in the third_party folder.
-ifeq ($(wildcard third_party/boringssl/include/openssl/ssl.h),)
+ifneq ($(wildcard third_party/openssl-1.0.2f/libssl.a),)
+HAS_EMBEDDED_OPENSSL_ALPN = third_party/openssl-1.0.2f
+else ifeq ($(wildcard third_party/boringssl/include/openssl/ssl.h),)
 HAS_EMBEDDED_OPENSSL_ALPN = false
 else
-HAS_EMBEDDED_OPENSSL_ALPN = true
+CAN_COMPILE_EMBEDDED_OPENSSL ?= $(shell $(BORINGSSL_COMPILE_CHECK_CMD) 2> /dev/null && echo true || echo false)
+HAS_EMBEDDED_OPENSSL_ALPN = $(CAN_COMPILE_EMBEDDED_OPENSSL)
 endif
 
 ifeq ($(wildcard third_party/zlib/zlib.h),)
@@ -572,8 +576,8 @@ ifeq ($(HAS_SYSTEM_OPENSSL_ALPN),true)
 EMBED_OPENSSL ?= false
 NO_SECURE ?= false
 else # HAS_SYSTEM_OPENSSL_ALPN=false
-ifeq ($(HAS_EMBEDDED_OPENSSL_ALPN),true)
+ifneq ($(HAS_EMBEDDED_OPENSSL_ALPN),false)
-EMBED_OPENSSL ?= true
+EMBED_OPENSSL ?= $(HAS_EMBEDDED_OPENSSL_ALPN)
 NO_SECURE ?= false
 else # HAS_EMBEDDED_OPENSSL_ALPN=false
 ifeq ($(HAS_SYSTEM_OPENSSL_NPN),true)
@@ -594,6 +598,12 @@ OPENSSL_MERGE_LIBS += $(LIBDIR)/$(CONFIG)/libboringssl.a
 OPENSSL_MERGE_OBJS += $(LIBBORINGSSL_OBJS)
 # need to prefix these to ensure overriding system libraries
 CPPFLAGS := -Ithird_party/boringssl/include $(CPPFLAGS)
+else ifneq ($(EMBED_OPENSSL),false)
+OPENSSL_DEP += $(EMBED_OPENSSL)/libssl.a $(EMBED_OPENSSL)/libcrypto.a
+OPENSSL_MERGE_LIBS += $(EMBED_OPENSSL)/libssl.a $(EMBED_OPENSSL)/libcrypto.a
+OPENSSL_MERGE_OBJS += $(wildcard $(EMBED_OPENSSL)/grpc_obj/*.o)
+# need to prefix these to ensure overriding system libraries
+CPPFLAGS := -I$(EMBED_OPENSSL)/include $(CPPFLAGS)
 else # EMBED_OPENSSL=false
 ifeq ($(HAS_PKG_CONFIG),true)
 OPENSSL_PKG_CONFIG = true
@@ -768,8 +778,9 @@ openssl_dep_message:
 	@echo
 	@echo "DEPENDENCY ERROR"
 	@echo
-	@echo "The target you are trying to run requires OpenSSL."
+	@echo "The target you are trying to run requires an OpenSSL implementation."
-	@echo "Your system doesn't have it, and neither does the third_party directory."
+	@echo "Your system doesn't have one, and either the third_party directory"
+	@echo "doesn't have it, or your compiler can't build BoringSSL."
 	@echo
 	@echo "Please consult INSTALL to get more information."
 	@echo
@@ -13021,3 +13032,7 @@ test/cpp/util/test_credentials_provider.cc: $(OPENSSL_DEP)
 endif
 
 .PHONY: all strip tools dep_error openssl_dep_error openssl_dep_message git_update stop buildtests buildtests_c buildtests_cxx test test_c test_cxx install install_c install_cxx install-headers install-headers_c install-headers_cxx install-shared install-shared_c install-shared_cxx install-static install-static_c install-static_cxx strip strip-shared strip-static strip_c strip-shared_c strip-static_c strip_cxx strip-shared_cxx strip-static_cxx dep_c dep_cxx bins_dep_c bins_dep_cxx clean
+
+.PHONY: printvars
+printvars:
+	@$(foreach V,$(sort $(.VARIABLES)),                 	  $(if $(filter-out environment% default automatic, 	  $(origin $V)),$(warning $V=$($V) ($(value $V)))))

build.yaml

@@ -2787,6 +2787,10 @@ node_modules:
   - src/node/ext/server.cc
   - src/node/ext/server_credentials.cc
   - src/node/ext/timeval.cc
+openssl_fallback:
+  base_uri: http://openssl.org/source/
+  extraction_dir: openssl-1.0.2f
+  tarball: openssl-1.0.2f.tar.gz
 python_dependencies:
   deps:
   - grpc

templates/Makefile.template

@@ -352,6 +352,7 @@
 
   OPENSSL_ALPN_CHECK_CMD = $(CC) $(CPPFLAGS) $(CFLAGS) -o $(TMPOUT) test/build/openssl-alpn.c $(addprefix -l, $(OPENSSL_LIBS)) $(LDFLAGS)
   OPENSSL_NPN_CHECK_CMD = $(CC) $(CPPFLAGS) $(CFLAGS) -o $(TMPOUT) test/build/openssl-npn.c $(addprefix -l, $(OPENSSL_LIBS)) $(LDFLAGS)
+  BORINGSSL_COMPILE_CHECK_CMD = $(CC) $(CPPFLAGS) ${defaults.boringssl.CPPFLAGS} $(CFLAGS) ${defaults.boringssl.CFLAGS} -o $(TMPOUT) test/build/boringssl.c $(LDFLAGS)
   ZLIB_CHECK_CMD = $(CC) $(CPPFLAGS) $(CFLAGS) -o $(TMPOUT) test/build/zlib.c -lz $(LDFLAGS)
   PROTOBUF_CHECK_CMD = $(CXX) $(CPPFLAGS) $(CXXFLAGS) -o $(TMPOUT) test/build/protobuf.cc -lprotobuf $(LDFLAGS)
 
@@ -436,10 +437,13 @@
   # Note that for testing purposes, one can do:
   #   make HAS_EMBEDDED_OPENSSL_ALPN=false
   # to emulate the fact we do not have OpenSSL in the third_party folder.
-  ifeq ($(wildcard third_party/boringssl/include/openssl/ssl.h),)
+  ifneq ($(wildcard third_party/${openssl_fallback.extraction_dir}/libssl.a),)
+  HAS_EMBEDDED_OPENSSL_ALPN = third_party/${openssl_fallback.extraction_dir}
+  else ifeq ($(wildcard third_party/boringssl/include/openssl/ssl.h),)
   HAS_EMBEDDED_OPENSSL_ALPN = false
   else
-  HAS_EMBEDDED_OPENSSL_ALPN = true
+  CAN_COMPILE_EMBEDDED_OPENSSL ?= $(shell $(BORINGSSL_COMPILE_CHECK_CMD) 2> /dev/null && echo true || echo false)
+  HAS_EMBEDDED_OPENSSL_ALPN = $(CAN_COMPILE_EMBEDDED_OPENSSL)
   endif
 
   ifeq ($(wildcard third_party/zlib/zlib.h),)
@@ -498,8 +502,8 @@
   EMBED_OPENSSL ?= false
   NO_SECURE ?= false
   else # HAS_SYSTEM_OPENSSL_ALPN=false
-  ifeq ($(HAS_EMBEDDED_OPENSSL_ALPN),true)
+  ifneq ($(HAS_EMBEDDED_OPENSSL_ALPN),false)
-  EMBED_OPENSSL ?= true
+  EMBED_OPENSSL ?= $(HAS_EMBEDDED_OPENSSL_ALPN)
   NO_SECURE ?= false
   else # HAS_EMBEDDED_OPENSSL_ALPN=false
   ifeq ($(HAS_SYSTEM_OPENSSL_NPN),true)
@@ -520,6 +524,12 @@
   OPENSSL_MERGE_OBJS += $(LIBBORINGSSL_OBJS)
   # need to prefix these to ensure overriding system libraries
   CPPFLAGS := -Ithird_party/boringssl/include $(CPPFLAGS)
+  else ifneq ($(EMBED_OPENSSL),false)
+  OPENSSL_DEP += $(EMBED_OPENSSL)/libssl.a $(EMBED_OPENSSL)/libcrypto.a
+  OPENSSL_MERGE_LIBS += $(EMBED_OPENSSL)/libssl.a $(EMBED_OPENSSL)/libcrypto.a
+  OPENSSL_MERGE_OBJS += $(wildcard $(EMBED_OPENSSL)/grpc_obj/*.o)
+  # need to prefix these to ensure overriding system libraries
+  CPPFLAGS := -I$(EMBED_OPENSSL)/include $(CPPFLAGS)
   else # EMBED_OPENSSL=false
   ifeq ($(HAS_PKG_CONFIG),true)
   OPENSSL_PKG_CONFIG = true
@@ -706,8 +716,9 @@
   	@echo
   	@echo "DEPENDENCY ERROR"
   	@echo
-  	@echo "The target you are trying to run requires OpenSSL."
+  	@echo "The target you are trying to run requires an OpenSSL implementation."
-  	@echo "Your system doesn't have it, and neither does the third_party directory."
+  	@echo "Your system doesn't have one, and either the third_party directory"
+  	@echo "doesn't have it, or your compiler can't build BoringSSL."
   	@echo
   	@echo "Please consult INSTALL to get more information."
   	@echo
@@ -1846,3 +1857,9 @@
   strip_cxx strip-shared_cxx strip-static_cxx \
   dep_c dep_cxx bins_dep_c bins_dep_cxx \
   clean
+
+  .PHONY: printvars
+  printvars:
+  	@$(foreach V,$(sort $(.VARIABLES)),                 \
+  	  $(if $(filter-out environment% default automatic, \
+  	  $(origin $V)),$(warning $V=$($V) ($(value $V)))))

templates/tools/dockerfile/test/cxx_squeeze_x64/Dockerfile.template

@@ -1,6 +1,6 @@
 %YAML 1.2
 --- |
-  # Copyright 2015-2016, Google Inc.
+  # Copyright 2016, Google Inc.
   # All rights reserved.
   #
   # Redistribution and use in source and binary forms, with or without
@@ -39,7 +39,9 @@
   RUN apt-get update && apt-get -y install python-pip && apt-get clean
   RUN pip install argparse
 
+  RUN wget ${openssl_fallback.base_uri + openssl_fallback.tarball}
+  ADD post-git-setup.sh /
+
   <%include file="../../run_tests_addons.include" args="skip_zookeeper=True"/>
   # Define the default command.
   CMD ["bash"]
-  

templates/tools/dockerfile/test/cxx_squeeze_x64/post-git-setup.sh.template

@@ -0,0 +1,37 @@
+%YAML 1.2
+--- |
+  #!/bin/bash
+  # Copyright 2016, Google Inc.
+  # All rights reserved.
+  #
+  # Redistribution and use in source and binary forms, with or without
+  # modification, are permitted provided that the following conditions are
+  # met:
+  #
+  #     * Redistributions of source code must retain the above copyright
+  # notice, this list of conditions and the following disclaimer.
+  #     * Redistributions in binary form must reproduce the above
+  # copyright notice, this list of conditions and the following disclaimer
+  # in the documentation and/or other materials provided with the
+  # distribution.
+  #     * Neither the name of Google Inc. nor the names of its
+  # contributors may be used to endorse or promote products derived from
+  # this software without specific prior written permission.
+  #
+  # THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+  # "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+  # LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+  # A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+  # OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+  # SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+  # LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+  # DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+  # THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+  # (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+  # OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+  set -ex
+
+  cd /var/local/git/grpc
+  cp /${openssl_fallback.tarball} third_party
+  ./tools/openssl/use_openssl.sh

templates/tools/openssl/use_openssl.sh.template

@@ -0,0 +1,63 @@
+%YAML 1.2
+--- |
+  #!/bin/bash
+
+  # Copyright 2015-2016, Google Inc.
+  # All rights reserved.
+  #
+  # Redistribution and use in source and binary forms, with or without
+  # modification, are permitted provided that the following conditions are
+  # met:
+  #
+  #     * Redistributions of source code must retain the above copyright
+  # notice, this list of conditions and the following disclaimer.
+  #     * Redistributions in binary form must reproduce the above
+  # copyright notice, this list of conditions and the following disclaimer
+  # in the documentation and/or other materials provided with the
+  # distribution.
+  #     * Neither the name of Google Inc. nor the names of its
+  # contributors may be used to endorse or promote products derived from
+  # this software without specific prior written permission.
+  #
+  # THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+  # "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+  # LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+  # A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+  # OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+  # SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+  # LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+  # DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+  # THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+  # (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+  # OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+  set -ex
+
+  cd $(dirname $0)/../..
+  set root=`pwd`
+  CC=${"${CC:-cc}"}
+
+  # allow openssl to be pre-downloaded
+  if [ ! -e third_party/${openssl_fallback.tarball} ]
+  then
+    echo "Downloading ${openssl_fallback.base_uri + openssl_fallback.tarball} to third_party/${openssl_fallback.tarball}"
+    wget ${openssl_fallback.base_uri + openssl_fallback.tarball} -O third_party/${openssl_fallback.tarball}
+  fi
+
+  # clean openssl directory
+  rm -rf third_party/${openssl_fallback.extraction_dir}
+
+  # extract archive
+  cd third_party
+  tar xfz ${openssl_fallback.tarball}
+
+  # build openssl
+  cd ${openssl_fallback.extraction_dir}
+  CC="$CC -fPIC -fvisibility=hidden" ./config no-asm
+  make
+
+  # generate the 'grpc_obj' directory needed by the makefile
+  mkdir grpc_obj
+  cd grpc_obj
+  ar x ../libcrypto.a
+  ar x ../libssl.a

test/build/boringssl.c

@@ -0,0 +1,50 @@
+/*
+ *
+ * Copyright 2016, Google Inc.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are
+ * met:
+ *
+ *     * Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ *     * Redistributions in binary form must reproduce the above
+ * copyright notice, this list of conditions and the following disclaimer
+ * in the documentation and/or other materials provided with the
+ * distribution.
+ *     * Neither the name of Google Inc. nor the names of its
+ * contributors may be used to endorse or promote products derived from
+ * this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ */
+
+// Check that boringssl is going to compile
+
+#include <unistd.h>
+
+// boringssl uses anonymous unions
+struct foo {
+  union {
+    int a;
+    int b;
+  };
+};
+
+int main(void) {
+  const char *close = "this should not shadow";
+  printf("%s\n", close);
+  return 0;
+}

tools/dockerfile/test/cxx_squeeze_x64/Dockerfile

@@ -1,4 +1,4 @@
-# Copyright 2015-2016, Google Inc.
+# Copyright 2016, Google Inc.
 # All rights reserved.
 #
 # Redistribution and use in source and binary forms, with or without
@@ -69,6 +69,9 @@ RUN apt-get update && apt-get -y install libgtest-dev libc++-dev clang && apt-ge
 RUN apt-get update && apt-get -y install python-pip && apt-get clean
 RUN pip install argparse
 
+RUN wget http://openssl.org/source/openssl-1.0.2f.tar.gz
+ADD post-git-setup.sh /
+
 # Prepare ccache
 RUN ln -s /usr/bin/ccache /usr/local/bin/gcc
 RUN ln -s /usr/bin/ccache /usr/local/bin/g++

tools/dockerfile/test/cxx_squeeze_x64/post-git-setup.sh

@@ -0,0 +1,35 @@
+#!/bin/bash
+# Copyright 2016, Google Inc.
+# All rights reserved.
+#
+# Redistribution and use in source and binary forms, with or without
+# modification, are permitted provided that the following conditions are
+# met:
+#
+#     * Redistributions of source code must retain the above copyright
+# notice, this list of conditions and the following disclaimer.
+#     * Redistributions in binary form must reproduce the above
+# copyright notice, this list of conditions and the following disclaimer
+# in the documentation and/or other materials provided with the
+# distribution.
+#     * Neither the name of Google Inc. nor the names of its
+# contributors may be used to endorse or promote products derived from
+# this software without specific prior written permission.
+#
+# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+# OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+set -ex
+
+cd /var/local/git/grpc
+cp /openssl-1.0.2f.tar.gz third_party
+./tools/openssl/use_openssl.sh

tools/jenkins/docker_run.sh

@@ -42,6 +42,8 @@ else
   cp -r "$EXTERNAL_GIT_ROOT/$RELATIVE_COPY_PATH"/* "/var/local/git/grpc/$RELATIVE_COPY_PATH"
 fi
 
+[ -e /post-git-setup.sh ] && /post-git-setup.sh
+
 if [ -x "$(command -v rvm)" ]
 then
   rvm use ruby-2.1

tools/jenkins/docker_run_tests.sh

@@ -43,6 +43,8 @@ chown $(whoami) $XDG_CACHE_HOME
 mkdir -p /var/local/git
 git clone --recursive /var/local/jenkins/grpc /var/local/git/grpc
 
+[ -e /post-git-setup.sh ] && /post-git-setup.sh
+
 mkdir -p reports
 
 exit_code=0

tools/openssl/use_openssl.sh

@@ -0,0 +1,61 @@
+#!/bin/bash
+
+# Copyright 2015-2016, Google Inc.
+# All rights reserved.
+#
+# Redistribution and use in source and binary forms, with or without
+# modification, are permitted provided that the following conditions are
+# met:
+#
+#     * Redistributions of source code must retain the above copyright
+# notice, this list of conditions and the following disclaimer.
+#     * Redistributions in binary form must reproduce the above
+# copyright notice, this list of conditions and the following disclaimer
+# in the documentation and/or other materials provided with the
+# distribution.
+#     * Neither the name of Google Inc. nor the names of its
+# contributors may be used to endorse or promote products derived from
+# this software without specific prior written permission.
+#
+# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+# OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+set -ex
+
+cd $(dirname $0)/../..
+set root=`pwd`
+CC=${CC:-cc}
+
+# allow openssl to be pre-downloaded
+if [ ! -e third_party/openssl-1.0.2f.tar.gz ]
+then
+  echo "Downloading http://openssl.org/source/openssl-1.0.2f.tar.gz to third_party/openssl-1.0.2f.tar.gz"
+  wget http://openssl.org/source/openssl-1.0.2f.tar.gz -O third_party/openssl-1.0.2f.tar.gz
+fi
+
+# clean openssl directory
+rm -rf third_party/openssl-1.0.2f
+
+# extract archive
+cd third_party
+tar xfz openssl-1.0.2f.tar.gz
+
+# build openssl
+cd openssl-1.0.2f
+CC="$CC -fPIC -fvisibility=hidden" ./config no-asm
+make
+
+# generate the 'grpc_obj' directory needed by the makefile
+mkdir grpc_obj
+cd grpc_obj
+ar x ../libcrypto.a
+ar x ../libssl.a