Detect and use libidn and libidn2 if present.

CMakeLists.txt

@@ -318,6 +318,18 @@ else ()
   message(WARNING "Neither pthreads nor Windows threading available.")
 endif ()
 
+# Libidn
+find_package(Libidn)
+if (Libidn_FOUND)
+  set(HAVE_LIBIDN 1)
+endif()
+
+# Libidn2
+find_package(Libidn2 "2.0.0")
+if (Libidn2_FOUND)
+  set(HAVE_LIBIDN2 1)
+endif()
+
 # Stuff that might be in a BSD library
 check_symbol_exists(strlcpy string.h HAVE_DECL_STRLCPY)
 check_symbol_exists(arc4random stdlib.h HAVE_DECL_ARC4RANDOM)
@@ -499,6 +511,8 @@ target_include_directories(getdns_objects
   src/yxml
 
   ${CMAKE_CURRENT_BINARY_DIR}
+  ${LIBIDN_INCLUDE_DIR}
+  ${LIBIDN2_INCLUDE_DIR}
   ${OPENSSL_INCLUDE_DIR}
   )
 if (NOT HAVE_SSL_DANE_ENABLE)
@@ -526,6 +540,12 @@ if (ENABLE_STATIC)
     Threads::Threads
     ${getdns_system_libs}
     )
+  if (Libidn_FOUND)
+    target_link_libraries(getdns INTERFACE Libidn::Libidn)
+  endif ()
+  if (Libidn2_FOUND)
+    target_link_libraries(getdns INTERFACE Libidn2::Libidn2)
+  endif ()
   set_target_properties(getdns PROPERTIES OUTPUT_NAME getdns${static_lib_suffix})
 endif ()
 
@@ -542,6 +562,12 @@ if (ENABLE_SHARED)
     Threads::Threads
     ${getdns_system_libs}
     )
+  if (Libidn_FOUND)
+    target_link_libraries(getdns INTERFACE Libidn::Libidn)
+  endif ()
+  if (Libidn2_FOUND)
+    target_link_libraries(getdns INTERFACE Libidn2::Libidn2)
+  endif ()
   set_target_properties(getdns_shared PROPERTIES OUTPUT_NAME getdns)
 
   if (NOT ENABLE_STATIC)

cmake/include/cmakeconfig.h.in

@@ -165,6 +165,9 @@
 #cmakedefine HAVE_UNBOUND_EVENT_API	1
 #cmakedefine HAVE_UB_CTX_SET_STUB	1
 
+#cmakedefine HAVE_LIBIDN		1
+#cmakedefine HAVE_LIBIDN2		1
+
 #cmakedefine DEFAULT_EVENTLOOP          "@DEFAULT_EVENTLOOP@"
 #cmakedefine USE_POLL_DEFAULT_EVENTLOOP 1
 

cmake/modules/FindLibidn.cmake

@@ -0,0 +1,61 @@
+#[=======================================================================[.rst:
+FindLibidn
+----------
+
+Find the Libidn library
+
+Imported targets
+^^^^^^^^^^^^^^^^
+
+This module defines the following :prop_tgt:`IMPORTED` targets:
+
+``Libidn::Libidn``
+  The Libidn library, if found.
+
+Result variables
+^^^^^^^^^^^^^^^^
+
+This module will set the following variables in your project:
+
+``Libidn_FOUND``
+  If false, do not try to use Libidn.
+``LIBIDN_INCLUDE_DIR``
+  where to find check.h, etc.
+``LIBIDN_LIBRARIES``
+  the libraries needed to use Libidn.
+
+#]=======================================================================]
+
+find_path(LIBIDN_INCLUDE_DIR idna.h
+  HINTS
+  "${LIBIDN_DIR}"
+  "${LIBIDN_DIR}/include"
+)
+
+find_library(LIBIDN_LIBRARY NAMES idn
+  HINTS
+  "${LIBIDN_DIR}"
+  "${LIBIDN_DIR}/lib"
+)
+
+set(LIBIDN_LIBRARIES "")
+
+if (LIBIDN_INCLUDE_DIR AND LIBIDN_LIBRARY)
+  if (NOT TARGET Libidn::Libidn)
+    add_library(Libidn::Libidn UNKNOWN IMPORTED)
+    set_target_properties(Libidn::Libidn PROPERTIES
+      INTERFACE_INCLUDE_DIRECTORIES "${LIBIDN_INCLUDE_DIR}"
+      IMPORTED_LINK_INTERFACE_LANGUAGES "C"
+      IMPORTED_LOCATION "${LIBIDN_LIBRARY}"
+      )
+  endif()
+endif()
+
+list(APPEND LIBIDN_LIBRARIES "${LIBIDN_LIBRARY}")
+
+include(FindPackageHandleStandardArgs)
+find_package_handle_standard_args(Libidn
+  REQUIRED_VARS LIBIDN_LIBRARIES LIBIDN_INCLUDE_DIR
+  )
+
+mark_as_advanced(LIBIDN_INCLUDE_DIR LIBIDN_LIBRARIES LIBIDN_LIBRARY)

cmake/modules/FindLibidn2.cmake

@@ -0,0 +1,69 @@
+#[=======================================================================[.rst:
+FindLibidn2
+-----------
+
+Find the Libidn2 library
+
+Imported targets
+^^^^^^^^^^^^^^^^
+
+This module defines the following :prop_tgt:`IMPORTED` targets:
+
+``Libidn2::Libidn2``
+  The Libidn2 library, if found.
+
+Result variables
+^^^^^^^^^^^^^^^^
+
+This module will set the following variables in your project:
+
+``Libidn2_FOUND``
+  If false, do not try to use Libidn2.
+``LIBIDN2_INCLUDE_DIR``
+  where to find check.h, etc.
+``LIBIDN2_LIBRARIES``
+  the libraries needed to use Libidn2.
+``LIBIDN2_VERSION``
+  the version of the Libidn2 library found
+
+#]=======================================================================]
+
+find_path(LIBIDN2_INCLUDE_DIR idn2.h
+  HINTS
+  "${LIBIDN2_DIR}"
+  "${LIBIDN2_DIR}/include"
+)
+
+find_library(LIBIDN2_LIBRARY NAMES idn2
+  HINTS
+  "${LIBIDN2_DIR}"
+  "${LIBIDN2_DIR}/lib"
+)
+
+set(LIBIDN2_LIBRARIES "")
+
+if (LIBIDN2_INCLUDE_DIR AND LIBIDN2_LIBRARY)
+  if (NOT TARGET Libidn2::Libidn2)
+    add_library(Libidn2::Libidn2 UNKNOWN IMPORTED)
+    set_target_properties(Libidn2::Libidn2 PROPERTIES
+      INTERFACE_INCLUDE_DIRECTORIES "${LIBIDN2_INCLUDE_DIR}"
+      IMPORTED_LINK_INTERFACE_LANGUAGES "C"
+      IMPORTED_LOCATION "${LIBIDN2_LIBRARY}"
+      )
+  endif ()
+
+  if (NOT LIBIDN2_VERSION AND LIBIDN2_INCLUDE_DIR AND EXISTS "${LIBIDN2_INCLUDE_DIR}/unbound.h")
+    file(STRINGS "${LIBIDN2_INCLUDE_DIR}/idn2.h" LIBIDN2_H REGEX "^#define IDN2_VERSION ")
+    string(REGEX REPLACE "^.*IDN2_VERSION \"([0-9.]+)\".*$" "\\1" LIBIDN2_VERSION "${LIBIDN2_H}")
+  endif ()
+endif()
+
+list(APPEND LIBIDN2_LIBRARIES "${LIBIDN2_LIBRARY}")
+
+include(FindPackageHandleStandardArgs)
+find_package_handle_standard_args(Libidn2
+  REQUIRED_VARS LIBIDN2_LIBRARIES LIBIDN2_INCLUDE_DIR
+  VERSION_VAR LIBIDN2_VERSION
+  )
+
+mark_as_advanced(LIBIDN2_INCLUDE_DIR LIBIDN2_LIBRARIES LIBIDN2_LIBRARY)