Store the version in version.cpp and group the library under src/core

libdpm-core.so's version was reaching the source as a compile-line
definition, with a fallback in two translation units that would have let
the library build and report 0.0.0 if the build ever stopped supplying
it. The version is a literal in src/core/version.cpp, the file named for
it, alongside dpm_core_version() which returns it and the parser for the
X.Y.Z strings modules report.

The library's sources and its version script move to src/core, leaving
src/cli, src/bundled-modules, and the documentation source beside it.

CMakeLists.txt

@@ -8,9 +8,9 @@ set(CMAKE_CXX_STANDARD_REQUIRED ON)
 # libdpm-core.so — the library (C ABI)
 # ---------------------------------------------------------------------
 add_library(dpm-core SHARED
-        src/context.cpp
-        src/modules.cpp
-        src/version.cpp
+        src/core/context.cpp
+        src/core/modules.cpp
+        src/core/version.cpp
 )
 
 target_include_directories(dpm-core PUBLIC
@@ -18,10 +18,6 @@ target_include_directories(dpm-core PUBLIC
         $<INSTALL_INTERFACE:include>
 )
 
-target_compile_definitions(dpm-core PRIVATE
-        DPM_CORE_VERSION_STR="${PROJECT_VERSION}"
-)
-
 # The public C API is the library's entire exported surface; internals
 # stay hidden. The version script pins the export list and versions the
 # symbols.
@@ -30,10 +26,10 @@ target_compile_options(dpm-core PRIVATE
         -fvisibility-inlines-hidden
 )
 target_link_options(dpm-core PRIVATE
-        -Wl,--version-script=${CMAKE_CURRENT_SOURCE_DIR}/src/libdpm-core.map
+        -Wl,--version-script=${CMAKE_CURRENT_SOURCE_DIR}/src/core/libdpm-core.map
 )
 set_property(TARGET dpm-core APPEND PROPERTY
-        LINK_DEPENDS ${CMAKE_CURRENT_SOURCE_DIR}/src/libdpm-core.map
+        LINK_DEPENDS ${CMAKE_CURRENT_SOURCE_DIR}/src/core/libdpm-core.map
 )
 
 target_link_libraries(dpm-core PRIVATE ${CMAKE_DL_LIBS})

src/core/context.cpp

@@ -32,10 +32,6 @@
 
 namespace fs = std::filesystem;
 
-#ifndef DPM_CORE_VERSION_STR
-#define DPM_CORE_VERSION_STR "0.0.0"
-#endif
-
 namespace {
 
 const char* DEFAULT_CONFIG_DIR  = "/etc/dpm/conf.d/";
@@ -252,11 +248,6 @@ void dpm_close(dpm_ctx* ctx)
     delete ctx;
 }
 
-const char* dpm_core_version(void)
-{
-    return DPM_CORE_VERSION_STR;
-}
-
 const char* dpm_config_get(dpm_ctx* ctx, const char* module,
                            const char* section, const char* key)
 {

src/core/modules.cpp

@@ -39,10 +39,6 @@
 
 namespace fs = std::filesystem;
 
-#ifndef DPM_CORE_VERSION_STR
-#define DPM_CORE_VERSION_STR "0.0.0"
-#endif
-
 /* dlclose wrapper referenced from context.cpp so handle release stays
    in one translation unit with the loader. */
 void dpm_internal_unload(void* handle)

src/core/version.cpp

@@ -1,6 +1,6 @@
 /**
  * @file version.cpp
- * @brief X.Y.Z version parsing
+ * @brief libdpm-core.so's version, and X.Y.Z version parsing
  *
  * @copyright Copyright (c) 2026 SILO GROUP LLC
  * @author Chris Punches <chris.punches@silogroup.org>
@@ -22,9 +22,19 @@
  */
 #include "internal/version.hpp"
 
+#include <dpm/core.h>
+
 #include <cctype>
 #include <cstdlib>
 
+/** libdpm-core.so's own version. */
+#define DPM_CORE_VERSION_STR "1.0.0"
+
+extern "C" const char* dpm_core_version(void)
+{
+    return DPM_CORE_VERSION_STR;
+}
+
 namespace dpm_core {
 
 bool parse_version(const char* s, long out[3])