fixed the fixed the gcc compiling error in ubuntu host OS

git-svn-id: https://rt-thread.googlecode.com/svn/trunk@2511 bbd45198-f89e-11dd-88c7-29a3b14d5316

bsp/efm32/efm32gg_rom.ld

+/***************************************************************************//**
+ * @file 		efm32_rom_gg.ld
+ * @brief 	Linker script for EFM32 giant gecko
+ * 	COPYRIGHT (C) 2012, RT-Thread Development Team
+ * @author 	onelife
+ * @version 1.0
+ *******************************************************************************
+ * @section License
+ * The license and distribution terms for this file may be found in the file
+ * LICENSE in this distribution or at http://www.rt-thread.org/license/LICENSE
+ *******************************************************************************
+ * @section Change Logs
+ * Date			Author		Notes
+ * 2011-12-08	onelife		Initial creation for EFM3 giant gecko support
+ * 2012-05-15	onelife		Modified to compatible with CMSIS v3
+ ******************************************************************************/
+MEMORY
+{
+    FLASH (rx) : ORIGIN = 0x00000000, LENGTH = 1048576
+    RAM (rwx)  : ORIGIN = 0x20000000, LENGTH = 131072
+}
+_system_stack_size = 0x200;
+
+/* Linker script to place sections and symbol values. Should be used together
+ * with other linker script that defines memory regions FLASH and RAM.
+ * It references following symbols, which must be defined in code:
+ *   Reset_Handler : Entry of reset handler
+ *
+ * It defines following symbols, which code can use without definition:
+ *   __exidx_start
+ *   __exidx_end
+ *   __etext
+ *   __data_start__
+ *   __preinit_array_start
+ *   __preinit_array_end
+ *   __init_array_start
+ *   __init_array_end
+ *   __fini_array_start
+ *   __fini_array_end
+ *   __data_end__
+ *   __bss_start__
+ *   __bss_end__
+ *   __end__
+ *   end
+ *   __HeapLimit
+ *   __StackLimit
+ *   __StackTop
+ *   __stack
+ */
+ENTRY(Reset_Handler)
+
+SECTIONS
+{
+	.text :
+	{
+		KEEP(*(.isr_vector))
+		*(.text*)
+
+		KEEP(*(.init))
+		KEEP(*(.fini))
+
+		/* .ctors */
+		*crtbegin.o(.ctors)
+		*crtbegin?.o(.ctors)
+		*(EXCLUDE_FILE(*crtend?.o *crtend.o) .ctors)
+		*(SORT(.ctors.*))
+		*(.ctors)
+
+		/* .dtors */
+ 		*crtbegin.o(.dtors)
+ 		*crtbegin?.o(.dtors)
+ 		*(EXCLUDE_FILE(*crtend?.o *crtend.o) .dtors)
+ 		*(SORT(.dtors.*))
+ 		*(.dtors)
+
+		*(.rodata*)
+
+		KEEP(*(.eh_frame*))
+
+		/* section information for finsh shell */
+		. = ALIGN(4);
+		__fsymtab_start = .;
+		KEEP(*(FSymTab))
+		__fsymtab_end = .;
+		. = ALIGN(4);
+		__vsymtab_start = .;
+		KEEP(*(VSymTab))
+		__vsymtab_end = .;
+	} > FLASH = 0
+
+	.ARM.extab :
+	{
+		*(.ARM.extab* .gnu.linkonce.armextab.*)
+	} > FLASH
+
+	__exidx_start = .;
+	.ARM.exidx :
+	{
+		*(.ARM.exidx* .gnu.linkonce.armexidx.*)
+	} > FLASH
+	__exidx_end = .;
+
+	__etext = .;
+
+	.data : AT (__etext)
+	{
+		__data_start__ = .;
+		*(vtable)
+		*(.data*)
+		*(.ram)
+
+		. = ALIGN(4);
+		/* preinit data */
+		PROVIDE_HIDDEN (__preinit_array_start = .);
+		KEEP(*(.preinit_array))
+		PROVIDE_HIDDEN (__preinit_array_end = .);
+
+		. = ALIGN(4);
+		/* init data */
+		PROVIDE_HIDDEN (__init_array_start = .);
+		KEEP(*(SORT(.init_array.*)))
+		KEEP(*(.init_array))
+		PROVIDE_HIDDEN (__init_array_end = .);
+
+
+		. = ALIGN(4);
+		/* finit data */
+		PROVIDE_HIDDEN (__fini_array_start = .);
+		KEEP(*(SORT(.fini_array.*)))
+		KEEP(*(.fini_array))
+		PROVIDE_HIDDEN (__fini_array_end = .);
+
+		. = ALIGN(4);
+		/* All data end */
+		__data_end__ = .;
+
+	} > RAM
+
+	.bss :
+	{
+		__bss_start__ = .;
+		*(.bss*)
+		*(COMMON)
+		__bss_end__ = .;
+	} > RAM
+
+	.heap :
+	{
+		__end__ = .;
+		end = __end__;
+		_end = __end__;
+		*(.heap*)
+		__HeapLimit = .;
+	} > RAM
+
+	/* .stack_dummy section doesn't contains any symbols. It is only
+	 * used for linker to calculate size of stack sections, and assign
+	 * values to stack symbols later */
+	.stack_dummy :
+	{
+		*(.stack)
+	} > RAM
+
+	/* Set stack top to end of RAM, and stack limit move down by
+	 * size of stack_dummy section */
+	__StackTop = ORIGIN(RAM) + LENGTH(RAM);
+	__StackLimit = __StackTop - SIZEOF(.stack_dummy);
+	PROVIDE(__stack = __StackTop);
+
+	/* Check if data + heap + stack exceeds RAM limit */
+	ASSERT(__StackLimit >= __HeapLimit, "region RAM overflowed with stack")
+}