Use --gc-sections during link

All common functions are being built into all binary images,
whether or not they are actually used. This change enables the
use of -ffunction-sections, -fdata-sections and --gc-sections
in the compiler and linker to remove unused code and data from
the images.

Change-Id: Ia9f78c01054ac4fa15d145af38b88a0d6fb7d409

Makefile

@@ -150,8 +150,10 @@ ASFLAGS			+= 	-nostdinc -ffreestanding -Wa,--fatal-warnings	\
 CFLAGS			:= 	-nostdinc -pedantic -ffreestanding -Wall	\
 				-Werror -mgeneral-regs-only -std=c99 -c -Os	\
 				-DDEBUG=${DEBUG} ${INCLUDES} ${CFLAGS}
+CFLAGS			+=	-ffunction-sections -fdata-sections
 
 LDFLAGS			+=	--fatal-warnings -O1
+LDFLAGS			+=	--gc-sections
 
 
 vpath %.ld.S bl1:bl2:bl31

bl1/bl1.ld.S

@@ -43,8 +43,8 @@ SECTIONS
 {
     ro : {
         __RO_START__ = .;
-        *bl1_entrypoint.o(.text)
-        *(.text)
+        *bl1_entrypoint.o(.text*)
+        *(.text*)
         *(.rodata*)
         *(.vectors)
         __RO_END__ = .;
@@ -57,7 +57,7 @@ SECTIONS
     . = NEXT(16);        /* Align LMA */
     .data : ALIGN(16) {  /* Align VMA */
         __DATA_RAM_START__ = .;
-        *(.data)
+        *(.data*)
         __DATA_RAM_END__ = .;
     } >RAM AT>ROM
 
@@ -73,7 +73,7 @@ SECTIONS
      */
     .bss : ALIGN(16) {
         __BSS_START__ = .;
-        *(.bss)
+        *(.bss*)
         *(COMMON)
         __BSS_END__ = .;
     } >RAM

bl2/bl2.ld.S

@@ -47,8 +47,8 @@ SECTIONS
 
     ro . : {
         __RO_START__ = .;
-        *bl2_entrypoint.o(.text)
-        *(.text)
+        *bl2_entrypoint.o(.text*)
+        *(.text*)
         *(.rodata*)
         *(.vectors)
         __RO_END_UNALIGNED__ = .;
@@ -63,7 +63,7 @@ SECTIONS
 
     .data . : {
         __DATA_START__ = .;
-        *(.data)
+        *(.data*)
         __DATA_END__ = .;
     } >RAM
 
@@ -79,7 +79,7 @@ SECTIONS
      */
     .bss : ALIGN(16) {
         __BSS_START__ = .;
-        *(SORT_BY_ALIGNMENT(.bss))
+        *(SORT_BY_ALIGNMENT(.bss*))
         *(COMMON)
         __BSS_END__ = .;
     } >RAM

bl31/bl31.ld.S

@@ -48,14 +48,14 @@ SECTIONS
 
     ro . : {
         __RO_START__ = .;
-        *bl31_entrypoint.o(.text)
-        *(.text)
+        *bl31_entrypoint.o(.text*)
+        *(.text*)
         *(.rodata*)
 
-        /* Ensure 8-byte alignment for descriptors */
+        /* Ensure 8-byte alignment for descriptors and ensure inclusion */
         . = ALIGN(8);
         __RT_SVC_DESCS_START__ = .;
-        *(rt_svc_descs)
+        KEEP(*(rt_svc_descs))
         __RT_SVC_DESCS_END__ = .;
 
         *(.vectors)
@@ -71,7 +71,7 @@ SECTIONS
 
     .data . : {
         __DATA_START__ = .;
-        *(.data)
+        *(.data*)
         __DATA_END__ = .;
     } >RAM
 
@@ -87,7 +87,7 @@ SECTIONS
      */
     .bss : ALIGN(16) {
         __BSS_START__ = .;
-        *(.bss)
+        *(.bss*)
         *(COMMON)
         __BSS_END__ = .;
     } >RAM

bl32/tsp/tsp.ld.S

@@ -48,8 +48,8 @@ SECTIONS
 
     ro . : {
         __RO_START__ = .;
-        *tsp_entrypoint.o(.text)
-        *(.text)
+        *tsp_entrypoint.o(.text*)
+        *(.text*)
         *(.rodata*)
         *(.vectors)
         __RO_END_UNALIGNED__ = .;
@@ -64,7 +64,7 @@ SECTIONS
 
     .data . : {
         __DATA_START__ = .;
-        *(.data)
+        *(.data*)
         __DATA_END__ = .;
     } >RAM
 
@@ -80,7 +80,7 @@ SECTIONS
      */
     .bss : ALIGN(16) {
         __BSS_START__ = .;
-        *(SORT_BY_ALIGNMENT(.bss))
+        *(SORT_BY_ALIGNMENT(.bss*))
         *(COMMON)
         __BSS_END__ = .;
     } >RAM