Introduce USED_ATTR wrapper for __attribute__((used)).

git-svn-id: svn://svn.rockbox.org/rockbox/trunk@31188 a1c6a512-1295-4272-9138-f99709370657

firmware/include/gcc_extensions.h

@@ -57,4 +57,13 @@
 #define FORCE_INLINE inline
 #endif
 
+
+/* Version information from http://ohse.de/uwe/articles/gcc-attributes.html */
+#if defined(__GNUC__) && (__GNUC__ >= 4 || \
+                    (__GNUC__ >= 3 && __GNUC_MINOR__ >= 1))
+#define USED_ATTR __attribute__((used))
+#else
+#define USED_ATTR
+#endif
+
 #endif /* _GCC_EXTENSIONS_H_ */

firmware/target/arm/imx31/dvfs_dptc-imx31.c

@@ -29,6 +29,7 @@
 #include "avic-imx31.h"
 #include "dvfs_dptc-imx31.h"
 #include "dvfs_dptc_tables-target.h"
+#include "gcc_extensions.h"
 
 /* Most of the code in here is based upon the Linux BSP provided by Freescale
  * Copyright 2004-2008 Freescale Semiconductor, Inc. All Rights Reserved. */
@@ -181,7 +182,7 @@ static void set_current_dvfs_level(unsigned int level)
 }
 
 /* DVFS Interrupt handler */
-static void __attribute__((used)) dvfs_int(void)
+static void USED_ATTR dvfs_int(void)
 {
     unsigned long pmcr0 = CCM_PMCR0;
     unsigned long fsvai = pmcr0 & CCM_PMCR0_FSVAI;

firmware/target/arm/s3c2440/system-s3c2440.c

@@ -23,6 +23,7 @@
 #include "panic.h"
 #include "mmu-arm.h"
 #include "cpu.h"
+#include "gcc_extensions.h"
 
 #define default_interrupt(name) \
   extern __attribute__((weak,alias("UIRQ"))) void name (void)
@@ -60,7 +61,7 @@ default_interrupt(SPI1);
 default_interrupt(RTC);
 default_interrupt(ADC);
 
-static void (* const irqvector[32])(void) __attribute__((__used__)) =
+static void (* const irqvector[32])(void) USED_ATTR =
 {
     EINT0, EINT1, EINT2, EINT3,
     EINT4_7, EINT8_23, CAM, nBATT_FLT, TICK, WDT_AC97,

firmware/target/arm/thread-arm.c

@@ -21,11 +21,13 @@
  *
  ****************************************************************************/
 
+#include "gcc_extensions.h"
+
 /*---------------------------------------------------------------------------
  * Start the thread running and terminate it if it returns
  *---------------------------------------------------------------------------
  */
-static void __attribute__((naked,used)) start_thread(void)
+static void __attribute__((naked)) USED_ATTR start_thread(void)
 {
     /* r0 = context */
     asm volatile (

firmware/target/arm/thread-pp.c

@@ -21,6 +21,8 @@
  *
  ****************************************************************************/
 
+#include "gcc_extensions.h"
+
 #if defined(MAX_PHYS_SECTOR_SIZE) && MEMORYSIZE == 64
 /* Support a special workaround object for large-sector disks */
 #define IF_NO_SKIP_YIELD(...) __VA_ARGS__
@@ -546,7 +548,7 @@ void core_wake(unsigned int othercore)
 #endif /* CPU_PPxxxx */
 
 /* Keep constant pool in range of inline ASM */
-static void __attribute__((naked, used)) dump_ltorg(void)
+static void __attribute__((naked)) USED_ATTR dump_ltorg(void)
 {
     asm volatile (".ltorg");
 }

firmware/target/coldfire/system-coldfire.c

@@ -171,7 +171,7 @@ default_interrupt (ADC);  /* A/D converter */
 #endif
 
 static void system_display_exception_info(unsigned long format,
-                                          unsigned long pc) __attribute__ ((noreturn, used));
+    unsigned long pc) __attribute__ ((noreturn)) USED_ATTR;
 static void system_display_exception_info(unsigned long format,
                                           unsigned long pc)
 {

firmware/target/coldfire/thread-coldfire.c

@@ -21,12 +21,14 @@
  *
  ****************************************************************************/
 
+#include "gcc_extensions.h"
+
 /*---------------------------------------------------------------------------
  * Start the thread running and terminate it if it returns
  *---------------------------------------------------------------------------
  */
 void start_thread(void); /* Provide C access to ASM label */
-static void __attribute__((used)) __start_thread(void)
+static void USED_ATTR __start_thread(void)
 {
     /* a0=macsr, a1=context */
     asm volatile (

firmware/target/hosted/thread-arm.c

@@ -23,11 +23,13 @@
  ****************************************************************************/
 
 #include <system.h>
+#include "gcc_extensions.h"
+
 /*---------------------------------------------------------------------------
  * Start the thread running and terminate it if it returns
  *---------------------------------------------------------------------------
  */
-static void __attribute__((naked,used)) start_thread(void)
+static void __attribute__((naked)) USED_ATTR start_thread(void)
 {
     /* r0 = context */
     asm volatile (

firmware/target/mips/thread-mips32.c

@@ -21,13 +21,15 @@
  *
  ****************************************************************************/
 
+#include "gcc_extensions.h"
+
 /*---------------------------------------------------------------------------
  * Start the thread running and terminate it if it returns
  *---------------------------------------------------------------------------
  */
 
 void start_thread(void); /* Provide C access to ASM label */
-static void __attribute__((used)) _start_thread(void)
+static void USED_ATTR _start_thread(void)
 {
     /* t1 = context */
     asm volatile (

firmware/target/sh/thread-sh.c

@@ -21,12 +21,14 @@
  *
  ****************************************************************************/
 
+#include "gcc_extensions.h"
+
 /*---------------------------------------------------------------------------
  * Start the thread running and terminate it if it returns
  *---------------------------------------------------------------------------
  */
 void start_thread(void); /* Provide C access to ASM label */
-static void __attribute__((used)) __start_thread(void)
+static void USED_ATTR __start_thread(void)
 {
     /* r8 = context */
     asm volatile (

firmware/thread.c

@@ -30,6 +30,8 @@
 #ifdef RB_PROFILE
 #include <profile.h>
 #endif
+#include "gcc_extensions.h"
+
 /****************************************************************************
  *                              ATTENTION!!                                 *
  *    See notes below on implementing processor-specific portions!          *
@@ -163,7 +165,7 @@ static inline void load_context(const void* addr)
 
 #if NUM_CORES > 1
 static void thread_final_exit_do(struct thread_entry *current)
-    __attribute__((noinline, noreturn, used));
+    __attribute__((noinline, noreturn)) USED_ATTR;
 #else
 static inline void thread_final_exit(struct thread_entry *current)
     __attribute__((always_inline, noreturn));