From 49f2493e14cd68ecc0e08ad2d9fc75739e419a3b Mon Sep 17 00:00:00 2001
From: Gil <mcg@google.com>
Date: Wed, 11 Jul 2018 19:32:24 -0700
Subject: Convert the gRPC external build to use an HTTP download (#1520)

* Add a download-only boringssl ExternalProject

Match boringssl version to grpc submodule version

* Split grpc into separate download and build tasks

This allows other external targets to download into the gRPC source tree
before grpc is actually built.

* Convert grpc to an http download
---
 cmake/external/grpc.cmake | 45 ++++++++++++++++++++++++++++++---------------
 1 file changed, 30 insertions(+), 15 deletions(-)

(limited to 'cmake/external/grpc.cmake')

diff --git a/cmake/external/grpc.cmake b/cmake/external/grpc.cmake
index d35eb15..310d238 100644
--- a/cmake/external/grpc.cmake
+++ b/cmake/external/grpc.cmake
@@ -13,7 +13,6 @@
 # limitations under the License.
 
 include(ExternalProject)
-include(ExternalProjectFlags)
 include(external/c-ares)
 include(external/protobuf)
 include(external/zlib)
@@ -29,15 +28,11 @@ if(GRPC_ROOT)
   return()
 endif()
 
-set(
-  GIT_SUBMODULES
-  third_party/boringssl
-)
-
 set(
   CMAKE_ARGS
   -DCMAKE_BUILD_TYPE:STRING=${CMAKE_BUILD_TYPE}
   -DBUILD_SHARED_LIBS:BOOL=OFF
+  -DgRPC_INSTALL:BOOL=OFF
   -DgRPC_BUILD_TESTS:BOOL=OFF
 
   # TODO(rsgowman): We're currently building nanopb twice; once via grpc, and
@@ -105,23 +100,43 @@ if(ZLIB_FOUND)
 endif()
 
 
-ExternalProject_GitSource(
-  GRPC_GIT
-  GIT_REPOSITORY "https://github.com/grpc/grpc.git"
-  GIT_TAG "v1.8.3"
-  GIT_SUBMODULES ${GIT_SUBMODULES}
-)
-
 ExternalProject_Add(
-  grpc
+  grpc-download
   DEPENDS
     c-ares
     protobuf
     zlib
 
-  ${GRPC_GIT}
+  DOWNLOAD_DIR ${FIREBASE_DOWNLOAD_DIR}
+  DOWNLOAD_NAME grpc-1.8.3.tar.gz
+  URL https://github.com/grpc/grpc/archive/v1.8.3.tar.gz
+  URL_HASH SHA256=c14bceddc6475a09927a815811a8161cdfa7acb445262835da6bc24da9842c92
+
+  PREFIX ${PROJECT_BINARY_DIR}
+  SOURCE_DIR ${PROJECT_BINARY_DIR}/src/grpc
+
+  CONFIGURE_COMMAND ""
+  BUILD_COMMAND ""
+  TEST_COMMAND ""
+  INSTALL_COMMAND ""
+)
+
+# gRPC depends upon these projects, so from an IWYU point of view should
+# include these files. Unfortunately gRPC's build requires these to be
+# subdirectories in its own source tree and CMake's ExternalProject download
+# step clears the source tree so these must be declared to depend upon the grpc
+# target. ExternalProject dependencies must already exist when declared so
+# these must come after the ExternalProject_Add block above.
+include(external/boringssl)
+
+ExternalProject_Add(
+  grpc
+  DEPENDS
+    boringssl
+    grpc-download
 
   PREFIX ${PROJECT_BINARY_DIR}
+  SOURCE_DIR ${PROJECT_BINARY_DIR}/src/grpc
 
   CMAKE_ARGS
     ${CMAKE_ARGS}
-- 
cgit v1.2.3