FindTIFF: add component CXX to include the C++ wrapper libtiffxx

Fixes: #20860

2 files changed, 27 insertions, 2 deletions

diff --git a/Tests/FindTIFF/Test/CMakeLists.txt b/Tests/FindTIFF/Test/CMakeLists.txt
index 85453ed..e235db3 100644
--- a/Tests/FindTIFF/Test/CMakeLists.txt
+++ b/Tests/FindTIFF/Test/CMakeLists.txt
@@ -1,14 +1,23 @@
 cmake_minimum_required(VERSION 3.1)
-project(TestFindTIFF C)
+project(TestFindTIFF)
 include(CTest)
 
-find_package(TIFF REQUIRED)
+find_package(TIFF REQUIRED COMPONENTS CXX)
 
 add_executable(test_tiff_tgt main.c)
 target_link_libraries(test_tiff_tgt TIFF::TIFF)
 add_test(NAME test_tiff_tgt COMMAND test_tiff_tgt)
 
+add_executable(test_tiffxx_tgt main.cxx)
+target_link_libraries(test_tiffxx_tgt TIFF::CXX)
+add_test(NAME test_tiffxx_tgt COMMAND test_tiffxx_tgt)
+
 add_executable(test_tiff_var main.c)
 target_include_directories(test_tiff_var PRIVATE ${TIFF_INCLUDE_DIRS})
 target_link_libraries(test_tiff_var PRIVATE ${TIFF_LIBRARIES})
 add_test(NAME test_tiff_var COMMAND test_tiff_var)
+
+add_executable(test_tiffxx_var main.cxx)
+target_include_directories(test_tiffxx_var PRIVATE ${TIFF_INCLUDE_DIRS})
+target_link_libraries(test_tiffxx_var PRIVATE ${TIFF_LIBRARIES})
+add_test(NAME test_tiffxx_var COMMAND test_tiffxx_var)
diff --git a/Tests/FindTIFF/Test/main.cxx b/Tests/FindTIFF/Test/main.cxx
new file mode 100644
index 0000000..f80a31f
--- /dev/null
+++ b/Tests/FindTIFF/Test/main.cxx
@@ -0,0 +1,16 @@
+#include <fstream>
+
+#include <assert.h>
+#include <tiffio.hxx>
+
+int main()
+{
+  /* Without any TIFF file to open, test that the call fails as
+     expected.  This tests that linking worked. */
+  TIFF* tiff = TIFFOpen("invalid.tiff", "r");
+  assert(!tiff);
+
+  std::ifstream s;
+  TIFF* tiffxx = TIFFStreamOpen("invalid.tiff", &s);
+  return 0;
+}