CMake builds: use a POST_BUILD command to install binaries for tests

This avoids abusing "make install" to install them in the correct locations
for running tests, which causes problems for CPack installers which rely on
the list of install()ed files.

infrastructure/cmake/CMakeLists.txt

@@ -194,6 +194,9 @@ endforeach()
 set(testmain_template_cpp
 	"${base_dir}/infrastructure/buildenv-testmain-template.cpp"
 )
+set(release_or_debug_dir
+	"${base_dir}/$<$<CONFIG:Debug>:debug>$<$<CONFIG:Release>:release>$<$<CONFIG:RelWithDebInfo>:release>"
+)
 
 if(WIN32)
 	set(time_test_command_prefix "")
@@ -242,18 +245,16 @@ foreach(module_dep ${module_deps})
 			set_target_properties(${module_name} PROPERTIES OUTPUT_NAME
 				"${bin_name}")
 
-			# Try using install(PROGRAMS) to avoid confusing the CPack NSIS
-			# generator with our absolute-path installations:
-			install(PROGRAMS "$<TARGET_FILE:${module_name}>"
-				CONFIGURATIONS Debug
-				DESTINATION "${base_dir}/debug/${module_dir}")
-			install(PROGRAMS "$<TARGET_FILE:${module_name}>"
-				CONFIGURATIONS Release;RelWithDebInfo
-				DESTINATION "${base_dir}/release/${module_dir}")
-
-			# This target is just for use by CPack generators, which ignore the
-			# absolute-path installations above, and for "make install" to actually
-			# install Box Backup on your system:
+			# Use a custom post-build command instead of install(...) to install
+			# binaries ready for running tests, because we don't want "make install" to
+			# do this too, and absolute-path installations break the CPack generators.
+			add_custom_command(TARGET ${module_name} POST_BUILD
+				COMMAND ${CMAKE_COMMAND} -E copy
+				"$<TARGET_FILE:${module_name}>"
+				"${release_or_debug_dir}/${module_dir}"
+				VERBATIM)
+
+			# For "make install" and CPack generators:
 			install(TARGETS ${module_name} RUNTIME
 				CONFIGURATIONS Debug;Release
 				DESTINATION "."
@@ -270,12 +271,15 @@ foreach(module_dep ${module_deps})
 			set(module_files ${module_files} "${testmain_template_cpp}")
 			add_executable(${module_name} ${module_files})
 
-			install(PROGRAMS "$<TARGET_FILE:${module_name}>"
-				CONFIGURATIONS Debug
-				DESTINATION "${base_dir}/debug/${module_dir}")
-			install(PROGRAMS "$<TARGET_FILE:${module_name}>"
-				CONFIGURATIONS Release;RelWithDebInfo
-				DESTINATION "${base_dir}/release/${module_dir}")
+			# Use a custom post-build command instead of install(...) to install
+			# binaries ready for running tests, because we don't want "make install" to
+			# do this too, and absolute-path installations break the CPack generators.
+			add_custom_command(TARGET ${module_name} POST_BUILD
+				COMMAND ${CMAKE_COMMAND} -E copy
+				"$<TARGET_FILE:${module_name}>"
+				"${release_or_debug_dir}/${module_dir}"
+				VERBATIM)
+
 			if(${APPVEYOR_MODE})
 				set(appveyor_runtest_pl_switch -a)
 			else()