Index: tools/rockboxdev.sh
===================================================================
--- tools/rockboxdev.sh	(revision 31177)
+++ tools/rockboxdev.sh	(working copy)
@@ -276,8 +276,8 @@
     echo ""
     case $arch in
         [Ss])
-            build "binutils" "sh-elf" "2.16.1" "" "--disable-werror"
-            build "gcc" "sh-elf" "4.0.3" "gcc-4.0.3-rockbox-1.diff"
+            build "binutils" "sh-elf" "2.21.1" "" "--disable-werror"
+            build "gcc" "sh-elf" "4.6.2" "gcc-4.6.2-rockbox-preliminary-1.diff"
             ;;
 
         [Ii])
Index: tools/configure
===================================================================
--- tools/configure	(revision 31177)
+++ tools/configure	(working copy)
@@ -3553,6 +3553,11 @@
       echo "WARNING: You use an unpatched gcc compiler: $gccver"
       echo "WARNING: http://www.rockbox.org/twiki/bin/view/Main/CrossCompiler"
     fi
+    
+    if test "$gccnum" -ge "406"; then
+      echo "Enabling link-time optimization"
+      GCCOPTS="$GCCOPTS -flto"
+    fi
   fi
 fi
 
Index: apps/plugin.h
===================================================================
--- apps/plugin.h	(revision 31177)
+++ apps/plugin.h	(working copy)
@@ -963,9 +963,9 @@
 extern unsigned char plugin_start_addr[];
 extern unsigned char plugin_end_addr[];
 #define PLUGIN_HEADER \
-        const struct plugin_api *rb DATA_ATTR; \
+        const struct plugin_api *rb DATA_ATTR __attribute__ ((used)); \
         const struct plugin_header __header \
-        __attribute__ ((section (".header")))= { \
+        __attribute__ ((section (".header"), used))= { \
         { PLUGIN_MAGIC, TARGET_ID, PLUGIN_API_VERSION, \
         plugin_start_addr, plugin_end_addr }, plugin__start, &rb };
 #else /* PLATFORM_HOSTED */
Index: apps/plugins/lib/gcc-support.c
===================================================================
--- apps/plugins/lib/gcc-support.c	(revision 31177)
+++ apps/plugins/lib/gcc-support.c	(working copy)
@@ -29,22 +29,22 @@
 }
 #endif
 
-void *memcpy(void *dest, const void *src, size_t n)
+void  __attribute__((used)) *memcpy(void *dest, const void *src, size_t n)
 {
     return rb->memcpy(dest, src, n);
 }
 
-void *memset(void *dest, int c, size_t n)
+void  __attribute__((used)) *memset(void *dest, int c, size_t n)
 {
     return rb->memset(dest, c, n);
 }
 
-void *memmove(void *dest, const void *src, size_t n)
+void  __attribute__((used)) *memmove(void *dest, const void *src, size_t n)
 {
     return rb->memmove(dest, src, n);
 }
 
-int memcmp(const void *s1, const void *s2, size_t n)
+int  __attribute__((used)) memcmp(const void *s1, const void *s2, size_t n)
 {
     return rb->memcmp(s1, s2, n);
 }
Index: firmware/target/sh/archos/timer-archos.c
===================================================================
--- firmware/target/sh/archos/timer-archos.c	(revision 31177)
+++ firmware/target/sh/archos/timer-archos.c	(working copy)
@@ -23,7 +23,7 @@
 #include "system.h"
 #include "timer.h"
 
-void IMIA4(void) __attribute__((interrupt_handler));
+void IMIA4(void) __attribute__((interrupt_handler, used));
 void IMIA4(void)
 {
     if (pfn_timer != NULL)
Index: firmware/target/sh/archos/audio-archos.c
===================================================================
--- firmware/target/sh/archos/audio-archos.c	(revision 31177)
+++ firmware/target/sh/archos/audio-archos.c	(working copy)
@@ -153,7 +153,7 @@
     }
 }
 
-void DEI3(void) __attribute__((interrupt_handler));
+void DEI3(void) __attribute__((interrupt_handler, used));
 void DEI3(void)
 {
     unsigned char* start;
@@ -177,7 +177,7 @@
     CHCR3 &= ~0x0002; /* Clear DMA interrupt */
 }
 
-void IMIA1(void) __attribute__((interrupt_handler));
+void IMIA1(void) __attribute__((interrupt_handler, used));
 void IMIA1(void) /* Timer 1 interrupt */
 {
     if(playing)
@@ -189,14 +189,14 @@
 #endif
 }
 
-void IRQ6(void) __attribute__((interrupt_handler));
+void IRQ6(void) __attribute__((interrupt_handler, used));
 void IRQ6(void) /* PB14: MAS stop demand IRQ */
 {
     SCR0 &= ~0x80;
 }
 
 #if (CONFIG_CODEC == MAS3587F) || (CONFIG_CODEC == MAS3539F)
-void IRQ3(void) __attribute__((interrupt_handler));
+void IRQ3(void) __attribute__((interrupt_handler, used));
 void IRQ3(void) /* PA15: MAS demand IRQ */
 {
     /* Begin with setting the IRQ to edge sensitive */
Index: firmware/target/sh/adc-sh.c
===================================================================
--- firmware/target/sh/adc-sh.c	(revision 31177)
+++ firmware/target/sh/adc-sh.c	(working copy)
@@ -59,7 +59,7 @@
     ADCSR = ADCSR_ADST | ADCSR_ADIE | ADCSR_SCAN | 3;
 }
 
-void ADITI(void) __attribute__((interrupt_handler));
+void ADITI(void) __attribute__((interrupt_handler, used));
 void ADITI(void)
 {
     if(ADCSR & ADCSR_ADF)
Index: firmware/target/sh/thread-sh.c
===================================================================
--- firmware/target/sh/thread-sh.c	(revision 31177)
+++ firmware/target/sh/thread-sh.c	(working copy)
@@ -30,6 +30,7 @@
 {
     /* r8 = context */
     asm volatile (
+        ".global _start_thread \n"
     "_start_thread:            \n" /* Start here - no naked attribute */
         "mov.l  @(4, r8), r0   \n" /* Fetch thread function pointer */
         "mov.l  @(28, r8), r15 \n" /* Set initial sp */
Index: firmware/target/sh/kernel-sh.c
===================================================================
--- firmware/target/sh/kernel-sh.c	(revision 31177)
+++ firmware/target/sh/kernel-sh.c	(working copy)
@@ -55,7 +55,7 @@
     TSTR |= 0x01; /* Start timer 1 */
 }
 
-void IMIA0(void) __attribute__ ((interrupt_handler));
+void IMIA0(void) __attribute__ ((interrupt_handler, used));
 void IMIA0(void)
 {
     /* Run through the list of tick tasks */
Index: firmware/target/sh/system-sh.c
===================================================================
--- firmware/target/sh/system-sh.c	(revision 31177)
+++ firmware/target/sh/system-sh.c	(working copy)
@@ -180,6 +180,7 @@
  * Must go into the same section as the UIE() handler */
 
     "\t.text\n"
+    ".global\t_UIE4\n"
     "_UIE4:\tbsr\t_UIE\n\tmov.l\t@r15+,r4\n"
     "_UIE5:\tbsr\t_UIE\n\tmov.l\t@r15+,r4\n"
     "_UIE6:\tbsr\t_UIE\n\tmov.l\t@r15+,r4\n"
@@ -286,13 +287,18 @@
     "_UIE107:\tbsr\t_UIE\n\tmov.l\t@r15+,r4\n"
     "_UIE108:\tbsr\t_UIE\n\tmov.l\t@r15+,r4\n"
     "_UIE109:\tbsr\t_UIE\n\tmov.l\t@r15+,r4\n"
+    "_UIE:\tmov.l\t__UIE_k,r0\n"
+    "jmp\t@r0\n"
+    "nop\n"
+    ".align\t4\n"
+    "__UIE_k:\t.long\t__UIE\n"
 
 );
 
 extern void UIE4(void); /* needed for calculating the UIE number */
 
-void UIE (unsigned int pc) __attribute__((section(".text")));
-void UIE (unsigned int pc) /* Unexpected Interrupt or Exception */
+void _UIE (unsigned int pc) __attribute__((section(".text"), used));
+void _UIE (unsigned int pc) /* Unexpected Interrupt or Exception */
 {
     unsigned int n;