diff --git a/gcc/ada/libgnat/system-vxworks7-aarch64-rtp-smp.ads b/gcc/ada/libgnat/system-vxworks7-aarch64-rtp-smp.ads
--- a/gcc/ada/libgnat/system-vxworks7-aarch64-rtp-smp.ads
+++ b/gcc/ada/libgnat/system-vxworks7-aarch64-rtp-smp.ads
@@ -71,8 +71,8 @@ package System is
    Null_Address : constant Address;
 
    Storage_Unit : constant := 8;
-   Word_Size    : constant := 64;
-   Memory_Size  : constant := 2 ** 64;
+   Word_Size    : constant := Standard'Word_Size;
+   Memory_Size  : constant := 2 ** Word_Size;
 
    --  Address comparison
 


diff --git a/gcc/ada/libgnat/system-vxworks7-arm-rtp-smp.ads b/gcc/ada/libgnat/system-vxworks7-arm-rtp-smp.ads
--- a/gcc/ada/libgnat/system-vxworks7-arm-rtp-smp.ads
+++ b/gcc/ada/libgnat/system-vxworks7-arm-rtp-smp.ads
@@ -71,8 +71,8 @@ package System is
    Null_Address : constant Address;
 
    Storage_Unit : constant := 8;
-   Word_Size    : constant := 32;
-   Memory_Size  : constant := 2 ** 32;
+   Word_Size    : constant := Standard'Word_Size;
+   Memory_Size  : constant := 2 ** Word_Size;
 
    --  Address comparison
 


diff --git a/gcc/ada/libgnat/system-vxworks7-e500-rtp-smp.ads b/gcc/ada/libgnat/system-vxworks7-e500-rtp-smp.ads
--- a/gcc/ada/libgnat/system-vxworks7-e500-rtp-smp.ads
+++ b/gcc/ada/libgnat/system-vxworks7-e500-rtp-smp.ads
@@ -71,8 +71,8 @@ package System is
    Null_Address : constant Address;
 
    Storage_Unit : constant := 8;
-   Word_Size    : constant := 32;
-   Memory_Size  : constant := 2 ** 32;
+   Word_Size    : constant := Standard'Word_Size;
+   Memory_Size  : constant := 2 ** Word_Size;
 
    --  Address comparison
 


diff --git a/gcc/ada/libgnat/system-vxworks7-e500-rtp.ads b/gcc/ada/libgnat/system-vxworks7-e500-rtp.ads
--- a/gcc/ada/libgnat/system-vxworks7-e500-rtp.ads
+++ b/gcc/ada/libgnat/system-vxworks7-e500-rtp.ads
@@ -71,8 +71,8 @@ package System is
    Null_Address : constant Address;
 
    Storage_Unit : constant := 8;
-   Word_Size    : constant := 32;
-   Memory_Size  : constant := 2 ** 32;
+   Word_Size    : constant := Standard'Word_Size;
+   Memory_Size  : constant := 2 ** Word_Size;
 
    --  Address comparison
 


diff --git a/gcc/ada/libgnat/system-vxworks7-ppc-rtp-smp.ads b/gcc/ada/libgnat/system-vxworks7-ppc-rtp-smp.ads
--- a/gcc/ada/libgnat/system-vxworks7-ppc-rtp-smp.ads
+++ b/gcc/ada/libgnat/system-vxworks7-ppc-rtp-smp.ads
@@ -71,8 +71,8 @@ package System is
    Null_Address : constant Address;
 
    Storage_Unit : constant := 8;
-   Word_Size    : constant := 32;
-   Memory_Size  : constant := 2 ** 32;
+   Word_Size    : constant := Standard'Word_Size;
+   Memory_Size  : constant := 2 ** Word_Size;
 
    --  Address comparison
 


diff --git a/gcc/ada/libgnat/system-vxworks7-ppc-rtp.ads b/gcc/ada/libgnat/system-vxworks7-ppc-rtp.ads
--- a/gcc/ada/libgnat/system-vxworks7-ppc-rtp.ads
+++ b/gcc/ada/libgnat/system-vxworks7-ppc-rtp.ads
@@ -71,8 +71,8 @@ package System is
    Null_Address : constant Address;
 
    Storage_Unit : constant := 8;
-   Word_Size    : constant := 32;
-   Memory_Size  : constant := 2 ** 32;
+   Word_Size    : constant := Standard'Word_Size;
+   Memory_Size  : constant := 2 ** Word_Size;
 
    --  Address comparison
 


diff --git a/gcc/ada/libgnat/system-vxworks7-ppc64-rtp-smp.ads b/gcc/ada/libgnat/system-vxworks7-ppc64-rtp-smp.ads
--- a/gcc/ada/libgnat/system-vxworks7-ppc64-rtp-smp.ads
+++ b/gcc/ada/libgnat/system-vxworks7-ppc64-rtp-smp.ads
@@ -71,8 +71,8 @@ package System is
    Null_Address : constant Address;
 
    Storage_Unit : constant := 8;
-   Word_Size    : constant := 64;
-   Memory_Size  : constant := 2 ** 64;
+   Word_Size    : constant := Standard'Word_Size;
+   Memory_Size  : constant := 2 ** Word_Size;
 
    --  Address comparison
 


diff --git a/gcc/ada/libgnat/system-vxworks7-x86-rtp-smp.ads b/gcc/ada/libgnat/system-vxworks7-x86-rtp-smp.ads
--- a/gcc/ada/libgnat/system-vxworks7-x86-rtp-smp.ads
+++ b/gcc/ada/libgnat/system-vxworks7-x86-rtp-smp.ads
@@ -69,8 +69,8 @@ package System is
    Null_Address : constant Address;
 
    Storage_Unit : constant := 8;
-   Word_Size    : constant := 32;
-   Memory_Size  : constant := 2 ** 32;
+   Word_Size    : constant := Standard'Word_Size;
+   Memory_Size  : constant := 2 ** Word_Size;
 
    --  Address comparison
 


diff --git a/gcc/ada/libgnat/system-vxworks7-x86-rtp.ads b/gcc/ada/libgnat/system-vxworks7-x86-rtp.ads
--- a/gcc/ada/libgnat/system-vxworks7-x86-rtp.ads
+++ b/gcc/ada/libgnat/system-vxworks7-x86-rtp.ads
@@ -69,8 +69,8 @@ package System is
    Null_Address : constant Address;
 
    Storage_Unit : constant := 8;
-   Word_Size    : constant := 32;
-   Memory_Size  : constant := 2 ** 32;
+   Word_Size    : constant := Standard'Word_Size;
+   Memory_Size  : constant := 2 ** Word_Size;
 
    --  Address comparison