ggml : replace compile definitions with version.h.in (#28364)

This commit adds a cmake version configuration file to replace the
current compile definition solution for the version.

The motivation for this change is that I made a mistake and did not take
into consideration that the compile definition means that this will
become a compiler flag for all sources in the target. This means that
when a version update happens that will recompile all sources in the
target even if they have not changed.

Refs: https://github.com/ggml-org/llama.cpp/pull/28278

ggml/CMakeLists.txt

@@ -404,10 +404,6 @@ write_basic_package_version_file(
     VERSION ${GGML_INSTALL_VERSION}
     COMPATIBILITY SameMajorVersion)
 
-target_compile_definitions(ggml-base PRIVATE
-    GGML_VERSION="${GGML_INSTALL_VERSION}"
-    GGML_COMMIT="${GGML_BUILD_COMMIT}"
-)
 message(STATUS "ggml version: ${GGML_INSTALL_VERSION}")
 message(STATUS "ggml commit:  ${GGML_BUILD_COMMIT}")
 

ggml/src/CMakeLists.txt

@@ -213,7 +213,9 @@ set_target_properties(ggml-base PROPERTIES
     SOVERSION ${GGML_VERSION_MAJOR}
 )
 
-target_include_directories(ggml-base PRIVATE .)
+configure_file(ggml-version.h.in ${CMAKE_CURRENT_BINARY_DIR}/ggml-version.h @ONLY)
+
+target_include_directories(ggml-base PRIVATE . ${CMAKE_CURRENT_BINARY_DIR})
 if (GGML_BACKEND_DL)
     target_compile_definitions(ggml-base PUBLIC GGML_BACKEND_DL)
 endif()

ggml/src/ggml-version.h.in

@@ -0,0 +1,4 @@
+#pragma once
+
+#define GGML_VERSION "@GGML_VERSION@"
+#define GGML_COMMIT  "@GGML_BUILD_COMMIT@"

ggml/src/ggml.c

@@ -1,6 +1,7 @@
 #define _CRT_SECURE_NO_DEPRECATE // Disables "unsafe" warnings on Windows
 #define _USE_MATH_DEFINES // For M_PI on MSVC
 
+#include "ggml-version.h"
 #include "ggml-backend.h"
 #include "ggml-impl.h"
 #include "ggml-threading.h"