SH gcc 4.6.3 with link-time optimization, for Archos targets

This is work from FS#12431 synced to current HEAD and slightly
tweaked (gcc 4.6.2 -> 4.6.3, binutils 2.21.1 -> 2.22)

Change-Id: I76af91e80ac2a9c16a776c7f0a33cc51603bbf9b

apps/plugin.h

@@ -974,9 +974,9 @@ struct plugin_header {
 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 USED_ATTR; \
         const struct plugin_header __header \
-        __attribute__ ((section (".header")))= { \
+        __attribute__ ((section (".header"))) USED_ATTR = { \
         { PLUGIN_MAGIC, TARGET_ID, PLUGIN_API_VERSION, \
         plugin_start_addr, plugin_end_addr }, plugin__start, &rb };
 #else /* PLATFORM_HOSTED */

apps/plugins/lib/gcc-support.c

@@ -29,22 +29,22 @@ void __attribute__((naked)) __div0(void)
 }
 #endif
 
-void *memcpy(void *dest, const void *src, size_t n)
+void USED_ATTR *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 USED_ATTR *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 USED_ATTR *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 USED_ATTR memcmp(const void *s1, const void *s2, size_t n)
 {
     return rb->memcmp(s1, s2, n);
 }

firmware/asm/sh/thread.c

@@ -30,6 +30,7 @@ static void USED_ATTR __start_thread(void)
 {
     /* 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 */

firmware/target/sh/adc-sh.c

@@ -59,7 +59,7 @@ static void adc_tick(void)
     ADCSR = ADCSR_ADST | ADCSR_ADIE | ADCSR_SCAN | 3;
 }
 
-void ADITI(void) __attribute__((interrupt_handler));
+void ADITI(void) __attribute__((interrupt_handler)) USED_ATTR;
 void ADITI(void)
 {
     if(ADCSR & ADCSR_ADF)

firmware/target/sh/archos/audio-archos.c

@@ -153,7 +153,7 @@ static void play_tick(void)
     }
 }
 
-void DEI3(void) __attribute__((interrupt_handler));
+void DEI3(void) __attribute__((interrupt_handler)) USED_ATTR;
 void DEI3(void)
 {
     const void* start;
@@ -177,7 +177,7 @@ void DEI3(void)
     CHCR3 &= ~0x0002; /* Clear DMA interrupt */
 }
 
-void IMIA1(void) __attribute__((interrupt_handler));
+void IMIA1(void) __attribute__((interrupt_handler)) USED_ATTR;
 void IMIA1(void) /* Timer 1 interrupt */
 {
     if(playing)
@@ -189,14 +189,14 @@ void IMIA1(void) /* Timer 1 interrupt */
 #endif
 }
 
-void IRQ6(void) __attribute__((interrupt_handler));
+void IRQ6(void) __attribute__((interrupt_handler)) USED_ATTR;
 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_ATTR;
 void IRQ3(void) /* PA15: MAS demand IRQ */
 {
     /* Begin with setting the IRQ to edge sensitive */

firmware/target/sh/archos/timer-archos.c

@@ -23,7 +23,7 @@
 #include "system.h"
 #include "timer.h"
 
-void IMIA4(void) __attribute__((interrupt_handler));
+void IMIA4(void) __attribute__((interrupt_handler)) USED_ATTR;
 void IMIA4(void)
 {
     if (pfn_timer != NULL)

firmware/target/sh/kernel-sh.c

@@ -55,7 +55,7 @@ void tick_start(unsigned int interval_in_ms)
     TSTR |= 0x01; /* Start timer 1 */
 }
 
-void IMIA0(void) __attribute__ ((interrupt_handler));
+void IMIA0(void) __attribute__ ((interrupt_handler)) USED_ATTR;
 void IMIA0(void)
 {
     /* Run through the list of tick tasks */

firmware/target/sh/system-sh.c

@@ -180,6 +180,7 @@ asm (
  * 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 +287,17 @@ asm (
     "_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_ATTR;
+void _UIE (unsigned int pc) /* Unexpected Interrupt or Exception */
 {
     unsigned int n;
 

tools/configure

@@ -3707,6 +3707,12 @@ if test "$CC" = "sh-elf-gcc"; then
       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
 

tools/rockboxdev.sh

@@ -361,8 +361,8 @@ do
             # default rule for Objective C. Disable the builtin make rules. See
             # http://sourceware.org/ml/binutils/2005-12/msg00259.html
             export MAKEFLAGS="-r $MAKEFLAGS"
-            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" "2.22" "" "--disable-werror"
+            build "gcc" "sh-elf" "4.6.3" "" "" "gmp mpfr mpc"
             ;;
 
         [Ii])