vcpkg/ports/s2geometry/CMakeLists.txt.patch

diff --git a/CMakeLists.txt b/CMakeLists.txt
index f080b4b..ba80cbc 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -26,16 +26,7 @@ set(CMAKE_CXX_EXTENSIONS OFF)
 
 list(APPEND CMAKE_MODULE_PATH "${CMAKE_SOURCE_DIR}/third_party/cmake")
 
-option(WITH_GFLAGS "Use gflags to change command line flags." OFF)
-add_feature_info(GFLAGS WITH_GFLAGS
-                 "allows changing command line flags.")
-
-# glog option can only be turned on if gflags is on.
-cmake_dependent_option(WITH_GLOG "Use glog for logging." ON
-                       "WITH_GFLAGS" OFF)
-add_feature_info(GLOG WITH_GLOG "provides logging configurability.")
-
-option(BUILD_SHARED_LIBS "Build shared libraries instead of static." ON)
+option(BUILD_SHARED_LIBS "Build shared libraries instead of static." OFF)
 add_feature_info(SHARED_LIBS BUILD_SHARED_LIBS
                  "builds shared libraries instead of static.")
 
@@ -46,26 +37,19 @@ add_feature_info(PYTHON WITH_PYTHON "provides python interface to S2")
 
 feature_summary(WHAT ALL)
 
-if (WITH_GLOG)
-    find_package(Glog REQUIRED)
-    # FindGFlags.cmake and FindGlog.cmake do not seem to implement REQUIRED;
-    # check manually.
-    if (NOT ${GLOG_FOUND})
-        message(FATAL_ERROR "Glog requested but not found")
-    endif()
-    add_definitions(-DS2_USE_GLOG)
-else()
-    # Don't output anything for LOG(INFO).
-    add_definitions(-DABSL_MIN_LOG_LEVEL=1)
+find_package(glog CONFIG REQUIRED)
+# FindGFlags.cmake and FindGlog.cmake do not seem to implement REQUIRED;
+# check manually.
+if (NOT ${GLOG_FOUND})
+    message(FATAL_ERROR "Glog requested but not found")
 endif()
+add_definitions(-DS2_USE_GLOG)
 
-if (WITH_GFLAGS)
-    find_package(GFlags REQUIRED)
-    if (NOT ${GFLAGS_FOUND})
-        message(FATAL_ERROR "GFlags requested but not found")
-    endif()
-    add_definitions(-DS2_USE_GFLAGS)
+find_package(gflags CONFIG REQUIRED)
+if (NOT ${GFLAGS_FOUND})
+    message(FATAL_ERROR "GFlags requested but not found")
 endif()
+add_definitions(-DS2_USE_GFLAGS)
 
 find_package(absl REQUIRED)
 find_package(OpenSSL REQUIRED)
@@ -101,7 +85,7 @@ endif()
 # something like:
 # OPENSSL_ROOT_DIR=/usr/local/opt/openssl cmake ..
 include_directories(
-    ${GFLAGS_INCLUDE_DIRS} ${GLOG_INCLUDE_DIRS} ${OPENSSL_INCLUDE_DIR})
+    gflags::gflags glog::glog OpenSSL::SSL OpenSSL::Crypto)
 
 if (WITH_PYTHON)
     include_directories(${Python3_INCLUDE_DIRS})
@@ -253,7 +237,10 @@ endif()
 # list(APPEND CMAKE_MODULE_PATH "<path_to_s2geometry_dir>/third_party/cmake")
 # add_subdirectory(<path_to_s2geometry_dir> s2geometry)
 # target_link_libraries(<target_name> s2)
-target_include_directories(s2 PUBLIC ${CMAKE_CURRENT_SOURCE_DIR}/src)
+target_include_directories(s2 PUBLIC 
+  $<BUILD_INTERFACE:${CMAKE_CURRENT_SOURCE_DIR}/src>
+  $<INSTALL_INTERFACE:include>
+)
 
 # Add version information to the target
 set_target_properties(s2 PROPERTIES
@@ -427,6 +414,12 @@ install(TARGETS ${S2_TARGETS}
         RUNTIME DESTINATION "${CMAKE_INSTALL_BINDIR}"
         ARCHIVE DESTINATION "${CMAKE_INSTALL_LIBDIR}"
         LIBRARY DESTINATION "${CMAKE_INSTALL_LIBDIR}")
+install(TARGETS s2 EXPORT unofficial-s2Targets)
+install(EXPORT unofficial-s2Targets
+  NAMESPACE unofficial-s2
+  FILE unofficial-s2Targets.cmake
+  DESTINATION share/unofficial-s2/
+)
 
 message("GTEST_ROOT: ${GTEST_ROOT}")
 if (GTEST_ROOT)
@@ -569,3 +562,13 @@ endif()
 if (${SWIG_FOUND} AND ${Python3_FOUND})
   add_subdirectory("src/python" python)
 endif()
+
+include(CMakePackageConfigHelpers)
+# generate the config file that is includes the exports
+configure_package_config_file(${CMAKE_CURRENT_SOURCE_DIR}/Config.cmake.in
+  "${CMAKE_CURRENT_BINARY_DIR}/unofficial-s2Config.cmake"
+  INSTALL_DESTINATION "share/unofficial-s2/"
+  NO_SET_AND_CHECK_MACRO
+  NO_CHECK_REQUIRED_COMPONENTS_MACRO
+)
+install(FILES ${CMAKE_CURRENT_BINARY_DIR}/unofficial-s2Config.cmake DESTINATION "share/unofficial-s2/")