build : fix embedded Metal library generation (#2045)

CMakeLists.txt

@@ -174,19 +174,28 @@ if (APPLE)
             set(WHISPER_EXTRA_FLAGS ${WHISPER_EXTRA_FLAGS} -DGGML_METAL_EMBED_LIBRARY)
 
             set(METALLIB_SOURCE "${CMAKE_SOURCE_DIR}/ggml-metal.metal")
+            set(COMMON_HEADER "${CMAKE_SOURCE_DIR}/ggml-common.h")
 
             file(MAKE_DIRECTORY "${CMAKE_BINARY_DIR}/autogenerated")
             set(EMBED_METALLIB_ASSEMBLY "${CMAKE_BINARY_DIR}/autogenerated/ggml-embed-metallib.s")
+            set(EMBED_METALLIB_SOURCE "${CMAKE_BINARY_DIR}/autogenerated/ggml-metal-combined.metal")
+
+            add_custom_command(
+                OUTPUT ${EMBED_METALLIB_SOURCE}
+                COMMAND sed -e "/^#include \\\"ggml-common.h\\\"/r ${COMMON_HEADER}" -e "/^#include \\\"ggml-common.h\\\"/d" ${METALLIB_SOURCE} > ${EMBED_METALLIB_SOURCE}
+                DEPENDS ${METALLIB_SOURCE} ${COMMON_HEADER}
+                COMMENT "Generating combined Metal library for embedding"
+            )
 
             add_custom_command(
                 OUTPUT ${EMBED_METALLIB_ASSEMBLY}
                 COMMAND echo ".section __DATA,__ggml_metallib" > ${EMBED_METALLIB_ASSEMBLY}
                 COMMAND echo ".globl _ggml_metallib_start" >> ${EMBED_METALLIB_ASSEMBLY}
                 COMMAND echo "_ggml_metallib_start:" >> ${EMBED_METALLIB_ASSEMBLY}
-                COMMAND echo ".incbin \\\"${METALLIB_SOURCE}\\\"" >> ${EMBED_METALLIB_ASSEMBLY}
+                COMMAND echo ".incbin \\\"${EMBED_METALLIB_SOURCE}\\\"" >> ${EMBED_METALLIB_ASSEMBLY}
                 COMMAND echo ".globl _ggml_metallib_end" >> ${EMBED_METALLIB_ASSEMBLY}
                 COMMAND echo "_ggml_metallib_end:" >> ${EMBED_METALLIB_ASSEMBLY}
-                DEPENDS ${METALLIB_SOURCE}
+                DEPENDS ${EMBED_METALLIB_SOURCE}
                 COMMENT "Generate assembly for embedded Metal library"
             )
 

Makefile

@@ -408,17 +408,19 @@ WHISPER_OBJ += ggml-metal.o
 ifdef WHISPER_METAL_EMBED_LIBRARY
 CFLAGS += -DGGML_METAL_EMBED_LIBRARY
 
-ggml-metal-embed.o: ggml-metal.metal
+ggml-metal-embed.o: ggml-metal.metal ggml-common.h
 	@echo "Embedding Metal library"
 	$(eval TEMP_ASSEMBLY=$(shell mktemp))
+	$(eval TEMP_METALLIB=$(shell mktemp))
+	@sed "/^#include \"ggml-common.h\"/{r ggml-common.h"$$'\n'"d;}" ggml-metal.metal > $(TEMP_METALLIB)
 	@echo ".section __DATA, __ggml_metallib" > $(TEMP_ASSEMBLY)
 	@echo ".globl _ggml_metallib_start" >> $(TEMP_ASSEMBLY)
 	@echo "_ggml_metallib_start:" >> $(TEMP_ASSEMBLY)
-	@echo ".incbin \"$<\"" >> $(TEMP_ASSEMBLY)
+	@echo ".incbin \"$(TEMP_METALLIB)\"" >> $(TEMP_ASSEMBLY)
 	@echo ".globl _ggml_metallib_end" >> $(TEMP_ASSEMBLY)
 	@echo "_ggml_metallib_end:" >> $(TEMP_ASSEMBLY)
 	@$(AS) $(TEMP_ASSEMBLY) -o $@
-	@rm -f ${TEMP_ASSEMBLY}
+	@rm -f $(TEMP_ASSEMBLY) $(TEMP_METALLIB)
 
 WHISPER_OBJ += ggml-metal-embed.o
 endif