build: allow semver versioning for edgesec

Allow releasing a pre-release version for edgesec,
as well as a build identifier.

This will be show when running `edgesec -v`, e.g.

`0.1.0-alpha.0+sha.abcdef12`

CMakeLists.txt

@@ -7,6 +7,20 @@ project(EDGESEC
   DESCRIPTION "Secure router - reference implementation"
   LANGUAGES C CXX
 )
+# CMake proposal for semver https://gitlab.kitware.com/cmake/cmake/-/issues/23649
+# set(PROJECT_VERSION_PRERELEASE alpha.0)
+
+set(
+  PROJECT_VERSION
+  "${PROJECT_VERSION_MAJOR}.${PROJECT_VERSION_MINOR}.${PROJECT_VERSION_PATCH}"
+)
+if (NOT "${PROJECT_VERSION_PRERELEASE}" STREQUAL "")
+  string(APPEND PROJECT_VERSION "-${PROJECT_VERSION_PRERELEASE}")
+endif()
+#
+if (NOT "${PROJECT_VERSION_BUILD_IDENTIFIER}" STREQUAL "")
+  string(APPEND PROJECT_VERSION "+${PROJECT_VERSION_BUILD_IDENTIFIER}")
+endif()
 
 list(APPEND CMAKE_MODULE_PATH "${CMAKE_CURRENT_SOURCE_DIR}/CMakeModules")
 list(APPEND CMAKE_MODULE_PATH "${CMAKE_CURRENT_SOURCE_DIR}/lib")
@@ -214,4 +228,4 @@ if (NOT BUILD_ONLY_DOCS)
 endif ()
 
 add_custom_target(archive COMMAND
-    ${CMAKE_COMMAND} -E tar "cvz" "${_project_lower}-${_sys}-${EDGESEC_VERSION_MAJOR}.${EDGESEC_VERSION_MINOR}.${EDGESEC_VERSION_PATCH}.tar.gz" --format=gnutar "${CMAKE_INSTALL_PREFIX}")
+    ${CMAKE_COMMAND} -E tar "cvz" "${_project_lower}-${_sys}-${PROJECT_VERSION}.tar.gz" --format=gnutar "${CMAKE_INSTALL_PREFIX}")

src/edgesec.c

@@ -73,11 +73,7 @@ void sighup_handler(int sig, void *ctx) {
 }
 
 void show_app_version(void) {
-  char buf[32];
-
-  snprintf(buf, ARRAY_SIZE(buf), "%d.%d.%d", EDGESEC_VERSION_MAJOR,
-           EDGESEC_VERSION_MINOR, EDGESEC_VERSION_PATCH);
-  fprintf(stdout, "edgesec app version %s\n", buf);
+  fprintf(stdout, "edgesec app version %s\n", EDGESEC_VERSION);
 }
 
 void show_app_help(char *app_name) {

src/recap.c

@@ -73,8 +73,7 @@ struct pcap_stream_context {
 };
 
 void show_app_version(void) {
-  fprintf(stdout, "recap app version %d.%d.%d\n", EDGESEC_VERSION_MAJOR,
-          EDGESEC_VERSION_MINOR, EDGESEC_VERSION_PATCH);
+  fprintf(stdout, "recap app version %s\n", EDGESEC_VERSION);
 }
 
 void show_app_help(char *app_name) {

version.h.in

@@ -1,3 +1,6 @@
+#define EDGESEC_VERSION "@PROJECT_VERSION@"
 #define EDGESEC_VERSION_MAJOR @PROJECT_VERSION_MAJOR@
 #define EDGESEC_VERSION_MINOR @PROJECT_VERSION_MINOR@
 #define EDGESEC_VERSION_PATCH @PROJECT_VERSION_PATCH@
+#define EDGESEC_VERSION_PRERELEASE "@PROJECT_VERSION_PRERELEASE@"
+#define EDGESEC_VERSION_BUILD_IDENTIFIER "@PROJECT_VERSION_BUILD_IDENTIFIER@"