FindIntl: Add imported target

Fixes: #21271
Signed-off-by: Sibi Siddharthan <sibisiddharthan.github@gmail.com>

1 files changed, 36 insertions, 8 deletions

diff --git a/Modules/FindIntl.cmake b/Modules/FindIntl.cmake
index 1a09a60972..d29f554eae 100644
--- a/Modules/FindIntl.cmake
+++ b/Modules/FindIntl.cmake
@@ -15,11 +15,16 @@ installation in several variables.  General variables::
   Intl_FOUND - true if the libintl headers and libraries were found
   Intl_INCLUDE_DIRS - the directory containing the libintl headers
   Intl_LIBRARIES - libintl libraries to be linked
+  Intl::Intl - imported target for Intl
 
 The following cache variables may also be set::
 
   Intl_INCLUDE_DIR - the directory containing the libintl headers
   Intl_LIBRARY - the libintl library (if any)
+  Intl_HAVE_GETTEXT_BUILTIN - check if gettext is in the C library
+  Intl_HAVE_DCGETTEXT_BUILTIN - check if dcgettext is in the C library
+  Intl_IS_BUILTIN - whether intl is a part of the C library determined
+      from the result of Intl_HAVE_GETTEXT_BUILTIN and Intl_HAVE_DCGETTEXT_BUILTIN
 
 .. note::
   On some platforms, such as Linux with GNU libc, the gettext
@@ -35,6 +40,22 @@ The following cache variables may also be set::
 
 # Written by Roger Leigh <rleigh@codelibre.net>
 
+include(${CMAKE_CURRENT_LIST_DIR}/CMakePushCheckState.cmake)
+include(${CMAKE_CURRENT_LIST_DIR}/CheckSymbolExists.cmake)
+
+# Check if we have libintl is a part of libc
+cmake_push_check_state(RESET)
+set(CMAKE_REQUIRED_QUIET TRUE)
+check_symbol_exists(gettext libintl.h Intl_HAVE_GETTEXT_BUILTIN)
+check_symbol_exists(dcgettext libintl.h Intl_HAVE_DCGETTEXT_BUILTIN) # redundant check
+cmake_pop_check_state()
+
+if(Intl_HAVE_GETTEXT_BUILTIN AND Intl_HAVE_DCGETTEXT_BUILTIN)
+  set(Intl_IS_BUILTIN TRUE)
+else()
+  set(Intl_IS_BUILTIN FALSE)
+endif()
+
 # Find include directory
 find_path(Intl_INCLUDE_DIR
           NAMES "libintl.h"
@@ -42,21 +63,28 @@ find_path(Intl_INCLUDE_DIR
 mark_as_advanced(Intl_INCLUDE_DIR)
 
 # Find all Intl libraries
-find_library(Intl_LIBRARY "intl" NAMES_PER_DIR
-  DOC "libintl libraries (if not in the C library)")
-mark_as_advanced(Intl_LIBRARY)
+set(Intl_REQUIRED_VARS)
+if(NOT Intl_IS_BUILTIN)
+  find_library(Intl_LIBRARY "intl" "libintl" NAMES_PER_DIR
+    DOC "libintl libraries (if not in the C library)")
+  mark_as_advanced(Intl_LIBRARY)
+  list(APPEND Intl_REQUIRED_VARS Intl_LIBRARY)
+endif()
 
 include(${CMAKE_CURRENT_LIST_DIR}/FindPackageHandleStandardArgs.cmake)
 FIND_PACKAGE_HANDLE_STANDARD_ARGS(Intl
                                   FOUND_VAR Intl_FOUND
-                                  REQUIRED_VARS Intl_INCLUDE_DIR
+                                  REQUIRED_VARS Intl_INCLUDE_DIR ${Intl_REQUIRED_VARS}
                                   FAIL_MESSAGE "Failed to find Gettext libintl")
+unset(Intl_REQUIRED_VARS)
 
 if(Intl_FOUND)
   set(Intl_INCLUDE_DIRS "${Intl_INCLUDE_DIR}")
-  if(Intl_LIBRARY)
-    set(Intl_LIBRARIES "${Intl_LIBRARY}")
-  else()
-    unset(Intl_LIBRARIES)
+  set(Intl_LIBRARIES "${Intl_LIBRARY}")
+  if(NOT TARGET Intl::Intl)
+    add_library(Intl::Intl INTERFACE IMPORTED)
+    set_target_properties(Intl::Intl PROPERTIES
+      INTERFACE_INCLUDE_DIRECTORIES "${Intl_INCLUDE_DIRS}"
+      INTERFACE_LINK_LIBRARIES "${Intl_LIBRARIES}")
   endif()
 endif()