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msba2: Use --gc-sections when linking.

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- Add `-Wl,--gc-sections` to LDFLAGS
 - Add `-fdata-sections` and `-ffunction-sections` to CFLAGS
 - Update lpc2387 linker script to keep the isr vector and init
   sections when garbage collecting.
 - Keep .ctors and .dtors sections (similar to what binutils default
   linker script does when building for Linux targets)

Signed-off-by: Joakim Gebart <joakim.gebart@eistec.se>
This commit is contained in:
Joakim Gebart 2014-12-17 11:32:00 +01:00
parent 2ec5f9daf6
commit 390b8394d6
2 changed files with 34 additions and 35 deletions
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4
boards/msba2-common/Makefile.include
View File

@ -7,7 +7,7 @@ export PREFIX = arm-none-eabi-
export CC = $(PREFIX)gcc
export CXX = $(PREFIX)g++
export AR = $(PREFIX)ar
export CFLAGS += -O2 -Wall -Wstrict-prototypes -mcpu=arm7tdmi-s -gdwarf-2
export CFLAGS += -O2 -Wall -Wstrict-prototypes -mcpu=arm7tdmi-s -gdwarf-2 -fdata-sections -ffunction-sections
export ASFLAGS = -gdwarf-2 -mcpu=arm7tdmi-s
export AS = $(PREFIX)as
export LINK = $(PREFIX)gcc
@ -15,7 +15,7 @@ export SIZE = $(PREFIX)size
export OBJCOPY = $(PREFIX)objcopy
FLASHER = lpc2k_pgm
TERMPROG ?= $(RIOTBASE)/dist/tools/pyterm/pyterm
LINKFLAGS += -gdwarf-2 -mcpu=arm7tdmi-s -static -lgcc -nostartfiles -T$(RIOTBASE)/cpu/$(CPU)/linkerscript.x
LINKFLAGS += -gdwarf-2 -mcpu=arm7tdmi-s -static -lgcc -nostartfiles -T$(RIOTBASE)/cpu/$(CPU)/linkerscript.x -Wl,--gc-sections
# unwanted (CXXUWFLAGS) and extra (CXXEXFLAGS) flags for c++
export CXXUWFLAGS +=

65
cpu/lpc2387/linkerscript.x
View File

@ -30,60 +30,59 @@ SECTIONS
{
.text : /* collect all sections that should go into FLASH after startup */
{
*(.vectors) /* Exception Vectors and branch table >= 64 bytes */
KEEP(*(.vectors)) /* Exception Vectors and branch table >= 64 bytes */
. = ALIGN(64);
*(.init)
*(.init0) /* Start here after reset. */
*(.init1)
*(.init2) /* Copy data loop */
*(.init3)
*(.init4) /* Clear bss */
*(.init5)
*(.init6) /* C++ constructors. */
*(.init7)
*(.init8)
*(.init9) /* Call main(). */
KEEP(*(.init))
KEEP(*(.init0)) /* Start here after reset. */
KEEP(*(.init1))
KEEP(*(.init2)) /* Copy data loop */
KEEP(*(.init3))
KEEP(*(.init4)) /* Clear bss */
KEEP(*(.init5))
KEEP(*(.init6)) /* C++ constructors. */
KEEP(*(.init7))
KEEP(*(.init8))
KEEP(*(.init9)) /* Call main(). */
*(.text) /* all .text sections (code) */
*(.text.*)
*(.gnu.linkonce.t.*)
. = ALIGN(4);
__commands_start = .;
*(.commands) /* command table */
KEEP(*(.commands)) /* command table */
__commands_end = .;
. = ALIGN(4);
__cfgspec_start = .;
*(.cfgspec) /* configuration spec table */
KEEP(*(.cfgspec)) /* configuration spec table */
__cfgspec_end = .;
. = ALIGN(4);
__ctors_start = .;
PROVIDE (_os_ctor_start = .);
*(.ctors);
KEEP (*(.init_array))
PROVIDE (_os_ctor_end = .);
PROVIDE(_os_ctor_start = .);
KEEP(*(.ctors));
KEEP(*(.init_array))
PROVIDE(_os_ctor_end = .);
__ctors_end = .;
*(.dtors);
KEEP(*(.dtors));
LONG (0);
*(.rodata .rodata.*) /* all .rodata sections (constants, strings, etc.) */
*(.gnu.linkonce.r.*)
*(.glue_7) /* all .glue_7 sections (no idea what these are) */
*(.glue_7t) /* all .glue_7t sections (no idea what these are) */
*(.glue_7) /* all .glue_7 sections, see https://gcc.gnu.org/ml/gcc-help/2009-03/msg00306.html */
*(.glue_7t) /* all .glue_7t sections */
*(.fini9)
*(.fini8)
*(.fini7)
*(.fini6) /* C++ destructors. */
*(.fini5)
*(.fini4)
*(.fini3)
*(.fini2)
*(.fini1)
*(.fini0) /* Infinite loop after program termination. */
*(.fini)
KEEP(*(.fini9))
KEEP(*(.fini8))
KEEP(*(.fini7))
KEEP(*(.fini6)) /* C++ destructors. */
KEEP(*(.fini5))
KEEP(*(.fini4))
KEEP(*(.fini3))
KEEP(*(.fini2))
KEEP(*(.fini1))
KEEP(*(.fini0)) /* Infinite loop after program termination. */
KEEP(*(.fini))
*(.gcc_except_table)