Remove register keyword from public header files

The following code

  void f(void)
  {
    register int i;
  }

gives a warning with GCC and -std=c++17

  test.cc: In function ‘void f()’:
  test.cc:3:15: warning: ISO C++1z does not allow ‘register’ storage class
  specifier [-Wregister]
    register int i;
		       ^

and clang with -std=c++14

  test.cc:3:3: warning: 'register' storage class specifier is deprecated
  and incompatible with C++1z [-Wdeprecated-register]
    register int i;
    ^~~~~~~~~
  1 warning generated.

Remove the use of the register keyword at least in the public header
files for C++ compatibility.

Close #3397.

3 files changed, 24 insertions, 24 deletions

diff --git a/cpukit/score/cpu/i386/include/rtems/score/cpu.h b/cpukit/score/cpu/i386/include/rtems/score/cpu.h
index 777439c6e0..42958c00f0 100644
--- a/cpukit/score/cpu/i386/include/rtems/score/cpu.h
+++ b/cpukit/score/cpu/i386/include/rtems/score/cpu.h
@@ -522,8 +522,8 @@ extern void _CPU_Fatal_halt(uint32_t source, uint32_t error)
 
 #define _CPU_Bitfield_Find_first_bit( _value, _output ) \
   { \
-    register uint16_t __value_in_register = ( _value ); \
-    uint16_t          __output = 0; \
+    uint16_t __value_in_register = ( _value ); \
+    uint16_t __output = 0; \
     __asm__ volatile ( "bsfw    %0,%1 " \
                     : "=r" ( __value_in_register ), "=r" ( __output ) \
                     : "0"  ( __value_in_register ), "1"  ( __output ) \
diff --git a/cpukit/score/cpu/i386/include/rtems/score/i386.h b/cpukit/score/cpu/i386/include/rtems/score/i386.h
index 2555d13b8b..4b94e6feeb 100644
--- a/cpukit/score/cpu/i386/include/rtems/score/i386.h
+++ b/cpukit/score/cpu/i386/include/rtems/score/i386.h
@@ -136,7 +136,7 @@ static inline uint16_t i386_swap_u16(
  */
 static inline unsigned int i386_get_cr0(void)
 {
-  register unsigned int segment = 0;
+  unsigned int segment = 0;
 
   __asm__ volatile ( "movl %%cr0,%0" : "=r" (segment) : "0" (segment) );
 
@@ -150,7 +150,7 @@ static inline void i386_set_cr0(unsigned int segment)
 
 static inline unsigned int i386_get_cr2(void)
 {
-  register unsigned int segment = 0;
+  unsigned int segment = 0;
 
   __asm__ volatile ( "movl %%cr2,%0" : "=r" (segment) : "0" (segment) );
 
@@ -159,7 +159,7 @@ static inline unsigned int i386_get_cr2(void)
 
 static inline unsigned int i386_get_cr3(void)
 {
-  register unsigned int segment = 0;
+  unsigned int segment = 0;
 
   __asm__ volatile ( "movl %%cr3,%0" : "=r" (segment) : "0" (segment) );
 
@@ -243,7 +243,7 @@ int i386_Physical_to_real(
 
 static __inline__ unsigned short i386_get_cs(void)
 {
-  register unsigned short segment = 0;
+  unsigned short segment = 0;
 
   __asm__ volatile ( "movw %%cs,%0" : "=r" (segment) : "0" (segment) );
 
@@ -252,7 +252,7 @@ static __inline__ unsigned short i386_get_cs(void)
 
 static __inline__ unsigned short i386_get_ds(void)
 {
-  register unsigned short segment = 0;
+  unsigned short segment = 0;
 
   __asm__ volatile ( "movw %%ds,%0" : "=r" (segment) : "0" (segment) );
 
@@ -261,7 +261,7 @@ static __inline__ unsigned short i386_get_ds(void)
 
 static __inline__ unsigned short i386_get_es(void)
 {
-  register unsigned short segment = 0;
+  unsigned short segment = 0;
 
   __asm__ volatile ( "movw %%es,%0" : "=r" (segment) : "0" (segment) );
 
@@ -270,7 +270,7 @@ static __inline__ unsigned short i386_get_es(void)
 
 static __inline__ unsigned short i386_get_ss(void)
 {
-  register unsigned short segment = 0;
+  unsigned short segment = 0;
 
   __asm__ volatile ( "movw %%ss,%0" : "=r" (segment) : "0" (segment) );
 
@@ -279,7 +279,7 @@ static __inline__ unsigned short i386_get_ss(void)
 
 static __inline__ unsigned short i386_get_fs(void)
 {
-  register unsigned short segment = 0;
+  unsigned short segment = 0;
 
   __asm__ volatile ( "movw %%fs,%0" : "=r" (segment) : "0" (segment) );
 
@@ -288,7 +288,7 @@ static __inline__ unsigned short i386_get_fs(void)
 
 static __inline__ unsigned short i386_get_gs(void)
 {
-  register unsigned short segment = 0;
+  unsigned short segment = 0;
 
   __asm__ volatile ( "movw %%gs,%0" : "=r" (segment) : "0" (segment) );
 
@@ -300,29 +300,29 @@ static __inline__ unsigned short i386_get_gs(void)
  */
 
 #define i386_outport_byte( _port, _value ) \
-do { register unsigned short __port  = _port; \
-     register unsigned char  __value = _value; \
+do { unsigned short __port  = _port; \
+     unsigned char  __value = _value; \
      \
      __asm__ volatile ( "outb %0,%1" : : "a" (__value), "d" (__port) ); \
    } while (0)
 
 #define i386_outport_word( _port, _value ) \
-do { register unsigned short __port  = _port; \
-     register unsigned short __value = _value; \
+do { unsigned short __port  = _port; \
+     unsigned short __value = _value; \
      \
      __asm__ volatile ( "outw %0,%1" : : "a" (__value), "d" (__port) ); \
    } while (0)
 
 #define i386_outport_long( _port, _value ) \
-do { register unsigned short __port  = _port; \
-     register unsigned int  __value = _value; \
+do { unsigned short __port  = _port; \
+     unsigned int  __value = _value; \
      \
      __asm__ volatile ( "outl %0,%1" : : "a" (__value), "d" (__port) ); \
    } while (0)
 
 #define i386_inport_byte( _port, _value ) \
-do { register unsigned short __port  = _port; \
-     register unsigned char  __value = 0; \
+do { unsigned short __port  = _port; \
+     unsigned char  __value = 0; \
      \
      __asm__ volatile ( "inb %1,%0" : "=a" (__value) \
                                 : "d"  (__port) \
@@ -331,8 +331,8 @@ do { register unsigned short __port  = _port; \
    } while (0)
 
 #define i386_inport_word( _port, _value ) \
-do { register unsigned short __port  = _port; \
-     register unsigned short __value = 0; \
+do { unsigned short __port  = _port; \
+     unsigned short __value = 0; \
      \
      __asm__ volatile ( "inw %1,%0" : "=a" (__value) \
                                 : "d"  (__port) \
@@ -341,8 +341,8 @@ do { register unsigned short __port  = _port; \
    } while (0)
 
 #define i386_inport_long( _port, _value ) \
-do { register unsigned short __port  = _port; \
-     register unsigned int  __value = 0; \
+do { unsigned short __port  = _port; \
+     unsigned int  __value = 0; \
      \
      __asm__ volatile ( "inl %1,%0" : "=a" (__value) \
                                 : "d"  (__port) \
diff --git a/cpukit/score/cpu/i386/include/rtems/score/interrupts.h b/cpukit/score/cpu/i386/include/rtems/score/interrupts.h
index 6067254509..b682772617 100644
--- a/cpukit/score/cpu/i386/include/rtems/score/interrupts.h
+++ b/cpukit/score/cpu/i386/include/rtems/score/interrupts.h
@@ -62,7 +62,7 @@ typedef int  (*rtems_raw_irq_is_enabled)	(const struct __rtems_raw_irq_connect_d
 
 #define i386_get_interrupt_level( _level ) \
   do { \
-    register uint32_t   _eflags; \
+    uint32_t   _eflags; \
     \
     __asm__ volatile ( "pushf ; \
                     pop %0" \