vcpkg fixes

vcpkg manigest:
- Add vcpkg-cmake as dependency of this project
- Don't support bcrypt as vcpkg feature.  Nobody using vcpkg wants bcrypt,
  so this is just a trap.

Local/test overlay port:
- Fix how we are setting SOURCE_PATH
- Add symlink to out vcpkg.json manifest, since a port needs one

Chat example built using vcpkg:
- Add GNS_LINK_STATIC option to vcpkg_example_chat project so I can test
  an app linking against static or dynamic lib.

examples/vcpkg_example_chat/CMakeLists.txt

@@ -14,5 +14,11 @@ add_executable(
 	example_chat
 	../example_chat.cpp)
 
-# This example links GameNetworkingSockets as a shared lib.
-target_link_libraries(example_chat GameNetworkingSockets::shared)
+# Link against shared or static depending on how vcpkg built the library.
+# Pass -DGNS_LINK_STATIC=ON to link statically (e.g. with x64-windows-static triplet).
+option(GNS_LINK_STATIC "Link GameNetworkingSockets statically" OFF)
+if(GNS_LINK_STATIC)
+	target_link_libraries(example_chat GameNetworkingSockets::static)
+else()
+	target_link_libraries(example_chat GameNetworkingSockets::shared)
+endif()

vcpkg.json

@@ -5,7 +5,12 @@
 	"description": "A basic transport layer for games.",
 	"homepage": "https://github.com/ValveSoftware/GameNetworkingSockets",
 	"builtin-baseline": "522253caf47268c1724f486a035e927a42a90092",
-	"dependencies": [ "protobuf", "openssl" ],
+	"dependencies": [
+		"protobuf",
+		"openssl",
+		{ "name": "vcpkg-cmake", "host": true },
+		{ "name": "vcpkg-cmake-config", "host": true }
+	],
 	"default-features": [ "openssl" ],
 	"features": {
 		"openssl": {

vcpkg_ports/gamenetworkingsockets/portfile.cmake

@@ -1,4 +1,6 @@
-set(SOURCE_PATH ".")
+# For local testing only -- points at the repo root instead of downloading a release.
+# The official vcpkg portfile replaces this line with vcpkg_from_github(...).
+get_filename_component(SOURCE_PATH "${CMAKE_CURRENT_LIST_DIR}/../.." ABSOLUTE)
 
 # Select crypto backend based on the selected crypto "feature"
 # WE ARE NOT SUPPOSED TO BE DOING THIS.
@@ -6,9 +8,12 @@ set(SOURCE_PATH ".")
 if ("libsodium" IN_LIST FEATURES)
     set(CRYPTO_BACKEND "libsodium")
 endif()
-if ("bcrypt" IN_LIST FEATURES)
-    set(CRYPTO_BACKEND "BCrypt")
-endif()
+# BCrypt is not supported as a vcpkg feature because it is only used for Xbox,
+# which does not use vcpkg.  If you want to use this for some reason, you'll
+# need to configure and build yourself.
+#if ("bcrypt" IN_LIST FEATURES)
+#    set(CRYPTO_BACKEND "BCrypt")
+#endif()
 if ( ( "${CRYPTO_BACKEND}" STREQUAL "" ) OR ( "openssl" IN_LIST FEATURES ) )
     set(CRYPTO_BACKEND "OpenSSL")
 endif()

vcpkg_ports/gamenetworkingsockets/vcpkg.json

@@ -0,0 +1 @@
+../../vcpkg.json