llama: fix whole source code rebuilt on each new commit (#28278)

src/CMakeLists.txt

@@ -52,12 +52,9 @@ set_target_properties(llama PROPERTIES
     MACHO_CURRENT_VERSION 0 # keep macOS linker from seeing oversized version number
 )
 
-target_compile_definitions(llama PRIVATE
-    LLAMA_VERSION="${LLAMA_VERSION}"
-    LLAMA_COMMIT="${LLAMA_BUILD_COMMIT}"
-)
+configure_file(llama-version.h.in ${CMAKE_CURRENT_BINARY_DIR}/llama-version.h @ONLY)
 
-target_include_directories(llama PRIVATE .)
+target_include_directories(llama PRIVATE . ${CMAKE_CURRENT_BINARY_DIR})
 target_include_directories(llama PUBLIC ../include)
 target_compile_features   (llama PRIVATE cxx_std_17) # don't bump
 

src/llama-version.h.in

@@ -0,0 +1,4 @@
+#pragma once
+
+#define LLAMA_VERSION "@LLAMA_VERSION@"
+#define LLAMA_COMMIT  "@LLAMA_BUILD_COMMIT@"

src/llama.cpp

@@ -1,6 +1,7 @@
 #include "llama.h"
 
 #include "llama-impl.h"
+#include "llama-version.h"
 
 #include "llama-chat.h"
 #include "llama-context.h"