fixed compilation with CMake < 3.13

Author: firewave

test/signal/CMakeLists.txt

@@ -1,20 +1,24 @@
-add_executable(test-signalhandler
-        test-signalhandler.cpp
-        ${PROJECT_SOURCE_DIR}/cli/signalhandler.cpp
-        ${PROJECT_SOURCE_DIR}/cli/stacktrace.cpp)
-target_include_directories(test-signalhandler PRIVATE ${PROJECT_SOURCE_DIR}/cli ${PROJECT_SOURCE_DIR}/lib)
-# names for static functions are omitted from trace
-target_compile_options_safe(test-signalhandler -Wno-missing-declarations)
-target_compile_options_safe(test-signalhandler -Wno-missing-prototypes)
-# required for backtrace() to produce function names
-target_link_options(test-signalhandler PRIVATE -rdynamic)
+if (CMAKE_VERSION VERSION_EQUAL "3.13" OR CMAKE_VERSION VERSION_GREATER "3.13")
+    # target_link_options requires CMake 3.13
 
-add_executable(test-stacktrace
-        test-stacktrace.cpp
-        ${PROJECT_SOURCE_DIR}/cli/stacktrace.cpp)
-target_include_directories(test-stacktrace PRIVATE ${PROJECT_SOURCE_DIR}/cli ${PROJECT_SOURCE_DIR}/lib)
-# names for static functions are omitted from trace
-target_compile_options_safe(test-stacktrace -Wno-missing-declarations)
-target_compile_options_safe(test-stacktrace -Wno-missing-prototypes)
-# required for backtrace() to produce function names
-target_link_options(test-stacktrace PRIVATE -rdynamic)
+    add_executable(test-signalhandler
+            test-signalhandler.cpp
+            ${PROJECT_SOURCE_DIR}/cli/signalhandler.cpp
+            ${PROJECT_SOURCE_DIR}/cli/stacktrace.cpp)
+    target_include_directories(test-signalhandler PRIVATE ${PROJECT_SOURCE_DIR}/cli ${PROJECT_SOURCE_DIR}/lib)
+    # names for static functions are omitted from trace
+    target_compile_options_safe(test-signalhandler -Wno-missing-declarations)
+    target_compile_options_safe(test-signalhandler -Wno-missing-prototypes)
+    # required for backtrace() to produce function names
+    target_link_options(test-signalhandler PRIVATE -rdynamic)
+
+    add_executable(test-stacktrace
+            test-stacktrace.cpp
+            ${PROJECT_SOURCE_DIR}/cli/stacktrace.cpp)
+    target_include_directories(test-stacktrace PRIVATE ${PROJECT_SOURCE_DIR}/cli ${PROJECT_SOURCE_DIR}/lib)
+    # names for static functions are omitted from trace
+    target_compile_options_safe(test-stacktrace -Wno-missing-declarations)
+    target_compile_options_safe(test-stacktrace -Wno-missing-prototypes)
+    # required for backtrace() to produce function names
+    target_link_options(test-stacktrace PRIVATE -rdynamic)
+endif()