Merge pull request #19620 from Tony1023/cocoapods-build

Reworked cocoapods installation

gRPC-Core.podspec

@@ -1387,8 +1387,7 @@ Pod::Spec.new do |s|
 
   # TODO (mxyan): Instead of this hack, add include path "third_party" to C core's include path?
   s.prepare_command = <<-END_OF_COMMAND
-    find src/core/ -type f ! -path '*.grpc_back' -print0 | xargs -0 -L1 sed -E -i'.grpc_back' 's;#include "(pb(_.*)?\\.h)";#include <nanopb/\\1>;g'
-    find src/core/ -type f -path '*.grpc_back' -print0 | xargs -0 rm
-    find src/core/ -type f \\( -path '*.h' -or -path '*.cc' \\) -print0 | xargs -0 -L1 sed -E -i'.grpc_back' 's;#include <openssl/;#include <openssl_grpc/;g'
+    find src/core/ -type f -print0 | xargs -0 -L1 sed -E -i '' 's;#include "(pb(_.*)?\\.h)";#if COCOAPODS\\\n  #include <nanopb/\\1>\\\n#else\\\n  #include "\\1"\\\n#endif;g'
+    find src/core/ -type f \\( -path '*.h' -or -path '*.cc' \\) -print0 | xargs -0 -L1 sed -E -i '' 's;#include <openssl/(.*)>;#if COCOAPODS\\\n  #include <openssl_grpc/\\1>\\\n#else\\\n  #include <openssl/\\1>\\\n#endif;g'
   END_OF_COMMAND
 end

templates/gRPC-Core.podspec.template

@@ -212,8 +212,7 @@
 
     # TODO (mxyan): Instead of this hack, add include path "third_party" to C core's include path?
     s.prepare_command = <<-END_OF_COMMAND
-      find src/core/ -type f ! -path '*.grpc_back' -print0 | xargs -0 -L1 sed -E -i'.grpc_back' 's;#include "(pb(_.*)?\\.h)";#include <nanopb/\\1>;g'
-      find src/core/ -type f -path '*.grpc_back' -print0 | xargs -0 rm
-      find src/core/ -type f \\( -path '*.h' -or -path '*.cc' \\) -print0 | xargs -0 -L1 sed -E -i'.grpc_back' 's;#include <openssl/;#include <openssl_grpc/;g'
+      find src/core/ -type f -print0 | xargs -0 -L1 sed -E -i '' 's;#include "(pb(_.*)?\\.h)";#if COCOAPODS\\\n  #include <nanopb/\\1>\\\n#else\\\n  #include "\\1"\\\n#endif;g'
+      find src/core/ -type f \\( -path '*.h' -or -path '*.cc' \\) -print0 | xargs -0 -L1 sed -E -i '' 's;#include <openssl/(.*)>;#if COCOAPODS\\\n  #include <openssl_grpc/\\1>\\\n#else\\\n  #include <openssl/\\1>\\\n#endif;g'
     END_OF_COMMAND
   end