From fb9f24eaee4c57d09ec0dca32abff840b39f7c7e Mon Sep 17 00:00:00 2001
From: Gil <mcg@google.com>
Date: Fri, 13 Jul 2018 11:09:44 -0700
Subject: Convert googletest and nanopb CMake builds to add_subdirectory
 (#1522)

* Add a download-only boringssl ExternalProject

Match boringssl version to grpc submodule version

Note: not yet in use

* 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

* Build googletest with add_subdirectory

Also:
  * Revert library-name modifications in the abseil-cpp build
  * Move abseil-cpp add_subdirectory build into place

* Build nanopb with add_subdirectory

* Force nanopb first to work around ODR violations

This is a temporary work-around for b/111328563.
---
 cmake/utils.cmake | 12 ++++++++++++
 1 file changed, 12 insertions(+)

(limited to 'cmake/utils.cmake')

diff --git a/cmake/utils.cmake b/cmake/utils.cmake
index 1c3cbd6..7d32624 100644
--- a/cmake/utils.cmake
+++ b/cmake/utils.cmake
@@ -89,3 +89,15 @@ function(add_objc_flags target)
     )
   endif()
 endfunction()
+
+# add_alias(alias_target actual_target)
+#
+# Adds a library alias target `alias_target` if it does not already exist,
+# aliasing to the given `actual_target` target. This allows library dependencies
+# to be specified uniformly in terms of the targets found in various
+# find_package modules even if the library is being built internally.
+function(add_alias ALIAS_TARGET ACTUAL_TARGET)
+  if(NOT TARGET ${ALIAS_TARGET})
+    add_library(${ALIAS_TARGET} ALIAS ${ACTUAL_TARGET})
+  endif()
+endfunction()
-- 
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