[thrift] Add FindProxygen cmake module

Proxygen uses autoconf at the moment (soon to switch to cmake)

thrift/cmake/FindProxygen.cmake

@@ -0,0 +1,85 @@
+# This will go away as soon as Proxygen switches over to cmake.
+#
+# Hints:
+#   Set PROXYGEN_ROOT_DIR to the installation prefix of proxygen
+#
+# Results:
+#   Sets proxygen_FOUND and defines the proxygen::proxygen TARGET
+
+include(FindPackageHandleStandardArgs)
+set(CMAKE_FIND_LIBRARY_SUFFIXES .a)
+
+find_path(
+    PROXYGEN_INCLUDE_DIR
+    NAMES
+        proxygen/lib/http/HTTPMessage.h
+    HINTS
+        ${PROXYGEN_ROOT_DIR}
+)
+
+find_library(
+    PROXYGEN_LIBRARY
+    NAMES
+        proxygenlib
+    HINTS
+        ${PROXYGEN_ROOT_DIR}
+)
+
+find_library(
+    PROXYGEN_LIBRARY_HTTPSERVER
+    NAMES
+        proxygenhttpserver
+    HINTS
+        ${PROXYGEN_ROOT_DIR}
+)
+
+find_package_handle_standard_args(proxygen
+    REQUIRED_VARS
+        PROXYGEN_INCLUDE_DIR
+        PROXYGEN_LIBRARY
+        PROXYGEN_LIBRARY_HTTPSERVER
+    FAIL_MESSAGE
+        "Could not find proxygen. Try setting the proxygen installation prefix with PROXYGEN_ROOT_DIR"
+)
+if(proxygen_FOUND)
+    if(NOT TARGET proxygen::lib)
+        add_library(proxygen::lib STATIC IMPORTED)
+        set_target_properties(proxygen::lib PROPERTIES
+            IMPORTED_LINK_INTERFACE_LANGUAGES "CXX"
+            IMPORTED_LOCATION "${PROXYGEN_LIBRARY}"
+        )
+        set_property(
+            TARGET proxygen::lib
+            APPEND
+            PROPERTY INTERFACE_LINK_LIBRARIES
+                Folly::folly
+                wangle::wangle
+                fizz::fizz
+        )
+    endif()
+
+    if (NOT TARGET proxygen::httpserver)
+        add_library(proxygen::httpserver STATIC IMPORTED)
+        set_target_properties(proxygen::httpserver PROPERTIES
+            IMPORTED_LINK_INTERFACE_LANGUAGES "CXX"
+            IMPORTED_LOCATION "${PROXYGEN_LIBRARY_HTTPSERVER}"
+            INTERFACE_LINK_LIBRARIES proxygen::lib
+        )
+    endif()
+
+    if (NOT TARGET proxygen::proxygen)
+        add_library(proxygen::proxygen INTERFACE IMPORTED)
+        set_property(TARGET proxygen::proxygen APPEND PROPERTY INTERFACE_LINK_LIBRARIES proxygen::httpserver proxygen::lib)
+        get_target_property(things proxygen::proxygen INTERFACE_LINK_LIBRARIES)
+        message(wut "${things}")
+        set_target_properties(
+            proxygen::proxygen
+            PROPERTIES
+             INTERFACE_INCLUDE_DIRECTORIES
+                ${PROXYGEN_INCLUDE_DIR}
+        )
+    endif()
+
+    message("Found proxygen")
+endif()
+