Added GCC options for removing unused functions/dead code. I don't have to split out all the functions from their files!

2007-10-15 12:26:47 +00:00
parent 947756fa0d
commit cbefb47a05
4 changed files with 17 additions and 9 deletions
@@ -24,8 +24,8 @@ BACNET_LIB_TARGET = $(BACNET_LIB_DIR)/lib$(BACNET_LIB_NAME).a
 # Compiler Setup
 INCLUDES = -I$(BACNET_INCLUDE) -I$(BACNET_PORT)
 LIBRARIES=-lc,-lgcc,-lm,-L=$(BACNET_LIB_DIR),-l$(BACNET_LIB_NAME)
-CFLAGS = -Wall -g $(INCLUDES) $(DEFINES)
-LFLAGS = -Wl,-Map=$(TARGET).map,$(LIBRARIES)
+CFLAGS = -Wall -g $(INCLUDES) $(DEFINES) -fdata-sections -ffunction-sections
+LFLAGS = -Wl,-Map=$(TARGET).map,$(LIBRARIES),--gc-sections,-static

 SRCS = main.c

@@ -1,5 +1,5 @@
 /* ****************************************************************************************************** */
-/*   demo_at91sam7_blink_flash.cmd			LINKER  SCRIPT                                                */
+/*                                          LINKER  SCRIPT                                                */
 /*                                                                                                        */
 /*                                                                                                        */
 /*   The Linker Script defines how the code and data emitted by the GNU C compiler and assembler are  	  */
@@ -8,10 +8,10 @@
 /*   Any symbols defined in the Linker Script are automatically global and available to the rest of the   */
 /*   program.                                                                                             */
 /*                                                                                                        */
-/*   To force the linker to use this LINKER SCRIPT, just add the -T demo_at91sam7_blink_flash.cmd         */
+/*   To force the linker to use this LINKER SCRIPT, just add the -T AT91SAM7S256.LD                       */
 /*   directive to the linker flags in the makefile. For example,                                          */
 /*                                                                                                        */
-/*   			LFLAGS  =  -Map main.map -nostartfiles -T demo_at91sam7_blink_flash.cmd                   */
+/*   			LFLAGS  =  -Map main.map -nostartfiles -T AT91SAM7S256.LD                                 */
 /*                                                                                                        */
 /*                                                                                                        */
 /*   The order that the object files are listed in the makefile determines what .text section is          */
@@ -128,7 +128,7 @@ SECTIONS
 	
 	.text :								/* collect all sections that should go into FLASH after startup  */ 
 	{
-		*(.text)						/* all .text sections (code)  */
+		*(.text*)						/* all .text sections (code)  */
 		*(.rodata)						/* all .rodata sections (constants, strings, etc.)  */
 		*(.rodata*)						/* all .rodata* sections (constants, strings, etc.)  */
 		*(.glue_7)						/* all .glue_7 sections  (no idea what these are) */
@@ -139,14 +139,14 @@ SECTIONS
 	.data :								/* collect all initialized .data sections that go into RAM  */ 
 	{
 		_data = .;						/* create a global symbol marking the start of the .data section  */
-		*(.data)						/* all .data sections  */
+		*(.data*)						/* all .data sections  */
 		_edata = .;						/* define a global symbol marking the end of the .data section  */
 	} >ram AT >flash          			/* put all the above into RAM (but load the LMA initializer copy into FLASH)  */

 	.bss :								/* collect all uninitialized .bss sections that go into RAM  */
 	{
 		_bss_start = .;					/* define a global symbol marking the start of the .bss section */
-		*(.bss)							/* all .bss sections  */
+		*(.bss*)							/* all .bss sections  */
 	} >ram								/* put all the above in RAM (it will be cleared in the startup code */

 	. = ALIGN(4);						/* advance location counter to the next 32-bit boundary */
@@ -27,12 +27,16 @@ INCLUDES += -I$(BACNET_INCLUDE)
 #OPTIMIZATION = -O0
 OPTIMIZATION = -Os
 CFLAGS = -fno-common $(INCLUDES) $(BACNET_FLAGS) -Wall -g
+# dead code removal
+CFLAGS += -fdata-sections -ffunction-sections
 LIBRARY = lib$(TARGET).a
 #  -Wa,<options> Pass comma-separated <options> on to the assembler
 AFLAGS = -Wa,-ahls,-mapcs-32,-adhlns=$(<:.s=.lst)
 #  -Wl,<options> Pass comma-separated <options> on to the linker
 LIBRARIES=-lc,-lgcc,-lm,-L=.,-l$(TARGET)
 LDFLAGS = -nostartfiles -Wl,-nostdlib,-Map=$(TARGET).map,$(LIBRARIES),-T$(LDSCRIPT)
+# dead code removal
+LDFLAGS += -Wl,--gc-sections,-static
 CPFLAGS = --output-target=binary
 ODFLAGS	= -x --syms

@@ -97,7 +97,9 @@ BFLAGS += -DMAX_TSM_TRANSACTIONS=0
 #BFLAGS += -DCRC_USE_TABLE
 BFLAGS += -DTEST_MSTP
 CFLAGS = $(COMMON)
-CFLAGS += -Wall -gdwarf-2 $(BFLAGS) $(OPTIMIZATION) -fsigned-char
+# dead code removal
+CFLAGS += -ffunction-sections -fdata-sections
+CFLAGS += -Wall -gdwarf-2 $(BFLAGS) $(OPTIMIZATION) -fsigned-char 
 CFLAGS += -MD -MP -MT $(*F).o -MF dep/$(@F).d

 ## Assembly specific flags
@@ -107,6 +109,8 @@ ASMFLAGS += -x assembler-with-cpp -Wa,-gdwarf2

 ## Linker flags
 LDFLAGS = $(COMMON)
+#dead code removal
+LDFLAGS += -Wl,--gc-sections,-static 
 LDFLAGS += -Wl,-Map=$(TARGET).map,-L=.,-l$(TARGET)
 #LDFLAGS += -Wl,-Map=$(TARGET).map