build: allow adding a program prefix for ds2

This new option emulates `--program-prefix` from autotools. This is
intended to help with installation of cross-compiled binaries for ds2.

Author: compnerd

CMakeLists.txt

@@ -14,6 +14,8 @@ cmake_policy(SET CMP0054 NEW)
 project(DebugServer2
   LANGUAGES C CXX)
 
+set(DS2_PROGRAM_PREFIX "" CACHE STRING "Prefix to apply to the ds2 binary")
+
 set(CMAKE_CXX_STANDARD 17)
 set(CMAKE_CXX_EXTENSIONS NO)
 set(CMAKE_CXX_STANDARD_REQUIRED YES)
@@ -351,6 +353,9 @@ target_include_directories(ds2 PUBLIC
   Headers
   ${CMAKE_CURRENT_BINARY_DIR}/Headers)
 
+set_target_properties(ds2 PROPERTIES
+  OUTPUT_NAME "${DS2_PROGRAM_PREFIX}ds2")
+
 execute_process(COMMAND git rev-parse --short HEAD
                 WORKING_DIRECTORY "${CMAKE_CURRENT_SOURCE_DIR}"
                 OUTPUT_VARIABLE DS2_GIT_HASH