[Build] Add some libraries to the autolink list.

For static linking, we need to list all the dependencies of libcurl
or libxml2 that we're using.  This differs from dynamic linking,
because in the latter case that information is in the shared objects,
which is not true in the statically linked case.

rdar://123381867

Author: al45tair

CMakeLists.txt

@@ -46,6 +46,7 @@ set(CMAKE_RUNTIME_OUTPUT_DIRECTORY ${CMAKE_BINARY_DIR}/bin)
 set(CMAKE_Swift_MODULE_DIRECTORY ${CMAKE_BINARY_DIR}/swift)
 
 option(BUILD_SHARED_LIBS "build shared libraries" ON)
+option(BUILD_FULLY_STATIC "build fully static" NO)
 option(HAS_LIBDISPATCH_API "has libdispatch API" ON)
 option(BUILD_NETWORKING "build FoundationNetworking module" ON)
 option(BUILD_TOOLS "build tools" ON)

Sources/FoundationNetworking/CMakeLists.txt

@@ -72,6 +72,14 @@ if(NOT BUILD_SHARED_LIBS)
     PRIVATE
       "SHELL:-Xfrontend -public-autolink-library -Xfrontend curl")
 
+  if(BUILD_FULLY_STATIC)
+    target_compile_options(FoundationNetworking
+      PRIVATE
+        "SHELL:-Xfrontend -public-autolink-library -Xfrontend crypto"
+        "SHELL:-Xfrontend -public-autolink-library -Xfrontend ssl"
+        "SHELL:-Xfrontend -public-autolink-library -Xfrontend z")
+  endif()
+
   # Merge private dependencies into single static objects archive
   set_property(TARGET FoundationNetworking PROPERTY STATIC_LIBRARY_OPTIONS
     $<TARGET_OBJECTS:CFURLSessionInterface>)

Sources/FoundationXML/CMakeLists.txt

@@ -23,6 +23,12 @@ if(NOT BUILD_SHARED_LIBS)
     PRIVATE
       "SHELL:-Xfrontend -public-autolink-library -Xfrontend xml2")
 
+  if(BUILD_FULLY_STATIC)
+    target_compile_options(FoundationXML
+      PRIVATE
+        "SHELL:-Xfrontend -public-autolink-library -Xfrontend z")
+  endif()
+
   # Merge private dependencies into single static objects archive
   set_property(TARGET FoundationXML PROPERTY STATIC_LIBRARY_OPTIONS
     $<TARGET_OBJECTS:CFXMLInterface>)