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.

1 files changed, 2 insertions, 2 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 ) \