diff --git a/CMakeLists.tpl b/CMakeLists.tpl
index a6d01be..3967c1d 100644
--- a/CMakeLists.tpl
+++ b/CMakeLists.tpl
@@ -6,6 +6,20 @@ add_compile_definitions(F_CPU=16000000)
 
 %build_flags%
 
+# Capture the effective build-time flags for the -v/--version output.
+string(TOUPPER "${CMAKE_BUILD_TYPE}" _sim_build_type)
+if(_sim_build_type STREQUAL "")
+    set(SIM_BUILD_TYPE "None")
+else()
+    set(SIM_BUILD_TYPE "${CMAKE_BUILD_TYPE}")
+endif()
+string(STRIP "${CMAKE_C_FLAGS} ${CMAKE_C_FLAGS_${_sim_build_type}}" SIM_C_FLAGS)
+configure_file(
+    ${CMAKE_CURRENT_LIST_DIR}/../src/build_info.h.in
+    ${CMAKE_CURRENT_BINARY_DIR}/build_info.h
+    @ONLY
+)
+
 include(../src/grbl/CMakeLists.txt)
 
 if (WIN32)
@@ -53,13 +67,16 @@ add_executable(grblHAL_sim
     ${platform_SRC}
 )
 
-target_link_libraries(grblHAL_sim PRIVATE 
+target_link_libraries(grblHAL_sim PRIVATE
     m
     grbl
     ${platform_LIB}
 )
 
-add_executable(grblHAL_validator 
+# Generated build_info.h lands in the build dir.
+target_include_directories(grblHAL_sim PRIVATE ${CMAKE_CURRENT_BINARY_DIR})
+
+add_executable(grblHAL_validator
     ../src/eeprom.c
     ../src/grbl_eeprom_extensions.c
     ../src/validator.c 
diff --git a/CMakeLists.txt b/CMakeLists.txt
index d1c19e9..f54e2e4 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -4,6 +4,20 @@ project(grblHAL-sim C)
 add_compile_definitions(F_CPU=16000000)
 #add_compile_definitions(SQUARING_ENABLED=1)
 
+# Capture the effective build-time flags for the -v/--version output.
+string(TOUPPER "${CMAKE_BUILD_TYPE}" _sim_build_type)
+if(_sim_build_type STREQUAL "")
+    set(SIM_BUILD_TYPE "None")
+else()
+    set(SIM_BUILD_TYPE "${CMAKE_BUILD_TYPE}")
+endif()
+string(STRIP "${CMAKE_C_FLAGS} ${CMAKE_C_FLAGS_${_sim_build_type}}" SIM_C_FLAGS)
+configure_file(
+    ${CMAKE_CURRENT_LIST_DIR}/src/build_info.h.in
+    ${CMAKE_CURRENT_BINARY_DIR}/build_info.h
+    @ONLY
+)
+
 include(src/grbl/CMakeLists.txt)
 
 if (WIN32)
@@ -51,13 +65,16 @@ add_executable(grblHAL_sim
     ${platform_SRC}
 )
 
-target_link_libraries(grblHAL_sim PRIVATE 
+target_link_libraries(grblHAL_sim PRIVATE
     m
     grbl
     ${platform_LIB}
 )
 
-add_executable(grblHAL_validator 
+# Generated build_info.h lands in the build dir.
+target_include_directories(grblHAL_sim PRIVATE ${CMAKE_CURRENT_BINARY_DIR})
+
+add_executable(grblHAL_validator
     src/eeprom.c
     src/grbl_eeprom_extensions.c
     src/validator.c 
diff --git a/src/build_info.h.in b/src/build_info.h.in
new file mode 100644
index 0000000..0b8303e
--- /dev/null
+++ b/src/build_info.h.in
@@ -0,0 +1,10 @@
+/* Generated by CMake from build_info.h.in - do not edit directly. */
+#ifndef _BUILD_INFO_H_
+#define _BUILD_INFO_H_
+
+#define SIM_BUILD_TYPE  "@SIM_BUILD_TYPE@"
+#define SIM_C_FLAGS     "@SIM_C_FLAGS@"
+#define SIM_COMPILER    "@CMAKE_C_COMPILER_ID@ @CMAKE_C_COMPILER_VERSION@"
+#define SIM_TARGET      "@CMAKE_SYSTEM_NAME@ @CMAKE_SYSTEM_PROCESSOR@"
+
+#endif
diff --git a/src/main.c b/src/main.c
index 38224ee..196512d 100644
--- a/src/main.c
+++ b/src/main.c
@@ -40,6 +40,7 @@
 #include "simulator.h"
 #include "eeprom.h"
 #include "grbl_interface.h"
+#include "build_info.h"
 
 #include "grbl/grbllib.h"
 
@@ -70,6 +71,7 @@ void print_usage(const char* badarg)
       "    -p <port>          : port to open raw telnet communication.\n"
       "    -c<comment_char>   : character to print before each line from grbl.  default = '#'\n"
       "    -n                 : no comments before grbl response lines.\n"
+      "    -v                 : print version and build information.\n"
       "    -h                 : this help.\n"
       "\n"
       "  <time_step> and <block_file> can be specifed with option flags or positional parameters\n"
@@ -79,6 +81,21 @@ void print_usage(const char* badarg)
       progname);
 }
 
+void print_version(void)
+{
+    printf("grblHAL simulator\n"
+      "  Build type : %s\n"
+      "  Compiler   : %s\n"
+      "  Target     : %s\n"
+      "  C flags    : %s\n"
+      "  Built      : %s %s\n",
+      SIM_BUILD_TYPE,
+      SIM_COMPILER,
+      SIM_TARGET,
+      SIM_C_FLAGS[0] ? SIM_C_FLAGS : "(none)",
+      __DATE__, __TIME__);
+}
+
 //wrapper for thread interface
 PLAT_THREAD_FUNC(grbl_main_thread, exit)
 {
@@ -199,6 +216,11 @@ int main(int argc, char *argv[])
         argv++; argc--;
         if (argv[0][0] == '-') {
 
+            if (!strcmp(argv[0], "--version")) {
+                print_version();
+                return EXIT_SUCCESS;
+            }
+
             switch(argv[0][1]){
 
                 case 'c':  //set Comment char 
@@ -259,6 +281,10 @@ int main(int argc, char *argv[])
                     args.port = atoi(*argv);
                     break;
 
+                case 'v':
+                    print_version();
+                    return EXIT_SUCCESS;
+
                 case 'h':
                     print_usage(NULL);
                     return EXIT_SUCCESS;