Tests/FindGDAL: add a test for FindGDAL

Tests/CMakeLists.txt

@@ -1384,6 +1384,10 @@ ${CMake_BINARY_DIR}/bin/cmake -DDIR=dev -P ${CMake_SOURCE_DIR}/Utilities/Release
     add_subdirectory(FindFreetype)
   endif()
 
+  if(CMake_TEST_FindGDAL)
+    add_subdirectory(FindGDAL)
+  endif()
+
   if(CMake_TEST_FindGSL)
     add_subdirectory(FindGSL)
   endif()

Tests/FindGDAL/CMakeLists.txt

@@ -0,0 +1,10 @@
+add_test(NAME FindGDAL.Test COMMAND
+  ${CMAKE_CTEST_COMMAND} -C $<CONFIGURATION>
+  --build-and-test
+  "${CMake_SOURCE_DIR}/Tests/FindGDAL/Test"
+  "${CMake_BINARY_DIR}/Tests/FindGDAL/Test"
+  ${build_generator_args}
+  --build-project TestFindGDAL
+  --build-options ${build_options}
+  --test-command ${CMAKE_CTEST_COMMAND} -V -C $<CONFIGURATION>
+  )

Tests/FindGDAL/Test/CMakeLists.txt

@@ -0,0 +1,18 @@
+cmake_minimum_required(VERSION 3.10)
+project(TestFindGDAL C)
+include(CTest)
+
+find_package(GDAL REQUIRED)
+
+# FindGDAL doesn't export a version number.
+#add_definitions(-DCMAKE_EXPECTED_GDAL_VERSION="${GDAL_VERSION}")
+add_definitions(-DCMAKE_EXPECTED_GDAL_VERSION="unknown")
+
+add_executable(test_tgt main.c)
+target_link_libraries(test_tgt GDAL::GDAL)
+add_test(NAME test_tgt COMMAND test_tgt)
+
+add_executable(test_var main.c)
+target_include_directories(test_var PRIVATE ${GDAL_INCLUDE_DIRS})
+target_link_libraries(test_var PRIVATE ${GDAL_LIBRARIES})
+add_test(NAME test_var COMMAND test_var)

Tests/FindGDAL/Test/main.c

@@ -0,0 +1,12 @@
+#include <gdal.h>
+#include <stdio.h>
+// #include <string.h>
+
+int main()
+{
+  printf("Found GDAL version %s, expected version %s\n", GDAL_RELEASE_NAME,
+         CMAKE_EXPECTED_GDAL_VERSION);
+  GDALAllRegister();
+  // return strcmp(GDAL_RELEASE_NAME, CMAKE_EXPECTED_GDAL_VERSION);
+  return 0;
+}