MIPS: Introduce --gc-sections for MIPS

All architectures but MIPS are using --gc-sections on final linking.
This patch introduces that feature for MIPS to reduce the memory and
flash footprint.

Signed-off-by: Daniel Schwierzeck <daniel.schwierzeck@googlemail.com>
Cc: Wolfgang Denk <wd@denx.de>
Cc: Stefan Roese <sr@denx.de>
Cc: Thomas Lange <thomas@corelatus.se>
Cc: Vlad Lungu <vlad.lungu@windriver.com>
Signed-off-by: Shinya Kuribayashi <skuribay@pobox.com>

arch/mips/config.mk

@@ -50,3 +50,5 @@ PLATFORM_CPPFLAGS += -DCONFIG_MIPS -D__MIPS__
 PLATFORM_CPPFLAGS		+= -G 0 -mabicalls -fpic
 PLATFORM_CPPFLAGS		+= -msoft-float
 PLATFORM_LDFLAGS		+= -G 0 -static -n -nostdlib
+PLATFORM_RELFLAGS		+= -ffunction-sections -fdata-sections
+LDFLAGS_FINAL			+= --gc-sections

board/dbau1x00/u-boot.lds

@@ -34,14 +34,14 @@ SECTIONS
 	. = ALIGN(4);
 	.text       :
 	{
-	  *(.text)
+	  *(.text*)
 	}
 
 	. = ALIGN(4);
 	.rodata  : { *(SORT_BY_ALIGNMENT(SORT_BY_NAME(.rodata*))) }
 
 	. = ALIGN(4);
-	.data  : { *(.data) }
+	.data  : { *(.data*) }
 
 	. = .;
 	_gp = ALIGN(16) + 0x7ff0;
@@ -52,7 +52,7 @@ SECTIONS
 	  __got_end = .;
 	}
 
-	.sdata  : { *(.sdata) }
+	.sdata  : { *(.sdata*) }
 
 	.u_boot_cmd : {
 	  __u_boot_cmd_start = .;
@@ -64,7 +64,7 @@ SECTIONS
 	num_got_entries = (__got_end - __got_start) >> 2;
 
 	. = ALIGN(4);
-	.sbss (NOLOAD)  : { *(.sbss) }
-	.bss (NOLOAD)  : { *(.bss) . = ALIGN(4); }
+	.sbss (NOLOAD)  : { *(.sbss*) }
+	.bss (NOLOAD)  : { *(.bss*) . = ALIGN(4); }
 	uboot_end = .;
 }

board/gth2/u-boot.lds

@@ -34,14 +34,14 @@ SECTIONS
 	. = ALIGN(4);
 	.text       :
 	{
-	  *(.text)
+	  *(.text*)
 	}
 
 	. = ALIGN(4);
 	.rodata  : { *(SORT_BY_ALIGNMENT(SORT_BY_NAME(.rodata*))) }
 
 	. = ALIGN(4);
-	.data  : { *(.data) }
+	.data  : { *(.data*) }
 
 	. = .;
 	_gp = ALIGN(16) + 0x7ff0;
@@ -52,7 +52,7 @@ SECTIONS
 	  __got_end = .;
 	}
 
-	.sdata  : { *(.sdata) }
+	.sdata  : { *(.sdata*) }
 
 	.u_boot_cmd : {
 	  __u_boot_cmd_start = .;
@@ -64,7 +64,7 @@ SECTIONS
 	num_got_entries = (__got_end - __got_start) >> 2;
 
 	. = ALIGN(4);
-	.sbss (NOLOAD)  : { *(.sbss) }
-	.bss (NOLOAD)  : { *(.bss) . = ALIGN(4); }
+	.sbss (NOLOAD)  : { *(.sbss*) }
+	.bss (NOLOAD)  : { *(.bss*) . = ALIGN(4); }
 	uboot_end = .;
 }

board/incaip/u-boot.lds

@@ -34,14 +34,14 @@ SECTIONS
 	. = ALIGN(4);
 	.text       :
 	{
-	  *(.text)
+	  *(.text*)
 	}
 
 	. = ALIGN(4);
 	.rodata  : { *(SORT_BY_ALIGNMENT(SORT_BY_NAME(.rodata*))) }
 
 	. = ALIGN(4);
-	.data  : { *(.data) }
+	.data  : { *(.data*) }
 
 	. = .;
 	_gp = ALIGN(16) + 0x7ff0;
@@ -52,7 +52,7 @@ SECTIONS
 	  __got_end = .;
 	}
 
-	.sdata  : { *(.sdata) }
+	.sdata  : { *(.sdata*) }
 
 	.u_boot_cmd : {
 	  __u_boot_cmd_start = .;
@@ -64,7 +64,7 @@ SECTIONS
 	num_got_entries = (__got_end - __got_start) >> 2;
 
 	. = ALIGN(4);
-	.sbss (NOLOAD)  : { *(.sbss) }
-	.bss (NOLOAD)  : { *(.bss) . = ALIGN(4); }
+	.sbss (NOLOAD)  : { *(.sbss*) }
+	.bss (NOLOAD)  : { *(.bss*) . = ALIGN(4); }
 	uboot_end = .;
 }

board/micronas/vct/u-boot.lds

@@ -31,14 +31,14 @@ SECTIONS
 	. = ALIGN(4);
 	.text       :
 	{
-	  *(.text)
+	  *(.text*)
 	}
 
 	. = ALIGN(4);
 	.rodata  : { *(SORT_BY_ALIGNMENT(SORT_BY_NAME(.rodata*))) }
 
 	. = ALIGN(4);
-	.data  : { *(.data) }
+	.data  : { *(.data*) }
 
 	. = .;
 	_gp = ALIGN(16) + 0x7ff0;
@@ -50,7 +50,7 @@ SECTIONS
 	}
 
 	. = ALIGN(4);
-	.sdata  : { *(.sdata) }
+	.sdata  : { *(.sdata*) }
 
 	. = ALIGN(4);
 	.u_boot_cmd : {
@@ -64,8 +64,8 @@ SECTIONS
 	num_got_entries = (__got_end - __got_start) >> 2;
 
 	. = ALIGN(4);
-	.sbss (NOLOAD)  : { *(.sbss) }
+	.sbss (NOLOAD)  : { *(.sbss*) }
 	. = ALIGN(4);
-	.bss (NOLOAD)  : { *(.bss) }
+	.bss (NOLOAD)  : { *(.bss*) }
 	uboot_end = .;
 }

board/pb1x00/u-boot.lds

@@ -34,14 +34,14 @@ SECTIONS
 	. = ALIGN(4);
 	.text       :
 	{
-	  *(.text)
+	  *(.text*)
 	}
 
 	. = ALIGN(4);
 	.rodata  : { *(SORT_BY_ALIGNMENT(SORT_BY_NAME(.rodata*))) }
 
 	. = ALIGN(4);
-	.data  : { *(.data) }
+	.data  : { *(.data*) }
 
 	. = .;
 	_gp = ALIGN(16) + 0x7ff0;
@@ -52,7 +52,7 @@ SECTIONS
 	  __got_end = .;
 	}
 
-	.sdata  : { *(.sdata) }
+	.sdata  : { *(.sdata*) }
 
 	.u_boot_cmd : {
 	  __u_boot_cmd_start = .;
@@ -64,7 +64,7 @@ SECTIONS
 	num_got_entries = (__got_end - __got_start) >> 2;
 
 	. = ALIGN(4);
-	.sbss (NOLOAD)  : { *(.sbss) }
-	.bss (NOLOAD)  : { *(.bss) . = ALIGN(4); }
+	.sbss (NOLOAD)  : { *(.sbss*) }
+	.bss (NOLOAD)  : { *(.bss*) . = ALIGN(4); }
 	uboot_end = .;
 }

board/qemu-mips/u-boot.lds

@@ -34,14 +34,14 @@ SECTIONS
 	. = ALIGN(4);
 	.text       :
 	{
-	  *(.text)
+	  *(.text*)
 	}
 
 	. = ALIGN(4);
 	.rodata  : { *(SORT_BY_ALIGNMENT(SORT_BY_NAME(.rodata*))) }
 
 	. = ALIGN(4);
-	.data  : { *(.data) }
+	.data  : { *(.data*) }
 
 	. = .;
 	_gp = ALIGN(16) +0x7ff0;
@@ -53,7 +53,7 @@ SECTIONS
 	}
 
 	. = ALIGN(4);
-	.sdata  : { *(.sdata) }
+	.sdata  : { *(.sdata*) }
 
 	. = .;
 	.u_boot_cmd : {
@@ -66,7 +66,7 @@ SECTIONS
 	num_got_entries = (__got_end - __got_start) >> 2;
 
 	. = ALIGN(4);
-	.sbss  : { *(.sbss) }
-	.bss  : { *(.bss) . = ALIGN(4); }
+	.sbss  : { *(.sbss*) }
+	.bss  : { *(.bss*) . = ALIGN(4); }
 	uboot_end = .;
 }

board/tb0229/u-boot.lds

@@ -34,14 +34,14 @@ SECTIONS
 	. = ALIGN(4);
 	.text       :
 	{
-	  *(.text)
+	  *(.text*)
 	}
 
 	. = ALIGN(4);
 	.rodata  : { *(SORT_BY_ALIGNMENT(SORT_BY_NAME(.rodata*))) }
 
 	. = ALIGN(4);
-	.data  : { *(.data) }
+	.data  : { *(.data*) }
 
 	. = .;
 	_gp = ALIGN(16) + 0x7ff0;
@@ -52,7 +52,7 @@ SECTIONS
 	  __got_end = .;
 	}
 
-	.sdata  : { *(.sdata) }
+	.sdata  : { *(.sdata*) }
 
 	.u_boot_cmd : {
 	  __u_boot_cmd_start = .;
@@ -64,7 +64,7 @@ SECTIONS
 	num_got_entries = (__got_end - __got_start) >> 2;
 
 	. = ALIGN(4);
-	.sbss (NOLOAD)  : { *(.sbss) }
-	.bss (NOLOAD)  : { *(.bss) . = ALIGN(4); }
+	.sbss (NOLOAD)  : { *(.sbss*) }
+	.bss (NOLOAD)  : { *(.bss*) . = ALIGN(4); }
 	uboot_end = .;
 }

examples/standalone/mips.lds

@@ -30,14 +30,14 @@ SECTIONS
 {
 	.text       :
 	{
-	  *(.text)
+	  *(.text*)
 	}
 
 	. = ALIGN(4);
 	.rodata  : { *(SORT_BY_ALIGNMENT(SORT_BY_NAME(.rodata*))) }
 
 	. = ALIGN(4);
-	.data  : { *(.data) }
+	.data  : { *(.data*) }
 
 	. = .;
 	_gp = ALIGN(16) + 0x7ff0;
@@ -48,12 +48,12 @@ SECTIONS
 	  __got_end = .;
 	}
 
-	.sdata  : { *(.sdata) }
+	.sdata  : { *(.sdata*) }
 
 	. = ALIGN(4);
 	__bss_start = .;
-	.sbss (NOLOAD) : { *(.sbss) }
-	.bss (NOLOAD)  : { *(.bss) . = ALIGN(4); }
+	.sbss (NOLOAD) : { *(.sbss*) }
+	.bss (NOLOAD)  : { *(.bss*) . = ALIGN(4); }
 
 	_end = .;
 }