Change CMake's nvbench::main exported target to correspond to static library

Previously, it corresponded to main.cu.o object file. Now it corresponds to
static library libnvbench_main.a which is archive file with main.cu.o object
in it.

This closes #349

nvbench/CMakeLists.txt

@@ -128,21 +128,24 @@ target_compile_features(nvbench PUBLIC cuda_std_17 PRIVATE cxx_std_17)
 add_dependencies(nvbench.all nvbench)
 
 # nvbench.main (nvbench::main)
-add_library(nvbench.main OBJECT main.cu)
+add_library(nvbench.main STATIC main.cu)
 nvbench_config_target(nvbench.main)
 # Internal NVBench builds should not suppress warnings from NVBench headers.
 target_compile_definitions(nvbench.main PRIVATE NVBENCH_NO_IMPLICIT_SYSTEM_HEADER)
 # Propagate `nvbench` to consumers but keep NVBench's own build warning-visible.
-target_link_libraries(nvbench.main INTERFACE nvbench)
+target_link_libraries(nvbench.main PUBLIC nvbench)
 # Ensure CUDA/CUPTI/NVML include dirs are visible for nvbench.main's build.
 target_link_libraries(nvbench.main PRIVATE ${ctk_libraries})
-# Add NVBench's headers privately so the object library itself sees warnings.
+# Add NVBench's headers privately so the main library itself sees warnings.
 target_include_directories(nvbench.main
   PRIVATE
     "$<BUILD_INTERFACE:${NVBench_SOURCE_DIR}>"
     "$<BUILD_INTERFACE:${NVBench_BINARY_DIR}>"
 )
-set_target_properties(nvbench.main PROPERTIES EXPORT_NAME main)
+set_target_properties(nvbench.main PROPERTIES
+  EXPORT_NAME main
+  OUTPUT_NAME nvbench_main
+)
 add_dependencies(nvbench.all nvbench.main)
 
 # Support add_subdirectory:

nvbench/main.cu

@@ -16,7 +16,7 @@
  *  limitations under the License.
  */
 
-// Provided as a CMake OBJECT library named nvbench::main so users don't have
+// Provided as a CMake static library named nvbench::main so users don't have
 // to add `NVBENCH_MAIN` to every benchmark executable.
 
 #include <nvbench/main.cuh>