[Ada] Do not generate elaboration code for alignment aspect

gcc/ada/

	* einfo.ads (Delayed Freezing and Elaboration): Adjust description.
	* freeze.adb (Freeze_Object_Declaration): Likewise.
	* sem_ch3.adb (Delayed_Aspect_Present): Likewise.  Do not return
	true for Alignment.
	* sem_ch13.adb (Analyze_Aspect_Specifications): Do not always delay
	for Alignment.  Moreover, for Alignment and various Size aspects,
	do not delay if the expression is an attribute whose prefix is the
	Standard package.

4 files changed, 21 insertions, 9 deletions

diff --git a/gcc/ada/einfo.ads b/gcc/ada/einfo.ads
index f3a042a..bea4db0 100644
--- a/gcc/ada/einfo.ads
+++ b/gcc/ada/einfo.ads
@@ -281,8 +281,7 @@ package Einfo is
 --  For object declarations, the flag is set when an address clause for the
 --  object is encountered. Legality checks on the address expression only take
 --  place at the freeze point of the object. In Ada 2012, the flag is also set
---  when an address or an alignment aspect for the object is encountered (note
---  the discrepancy with the non-aspect case).
+--  when an address aspect for the object is encountered.
 
 --  Most types have an explicit freeze node, because they cannot be elaborated
 --  until all representation and operational items that apply to them have been
diff --git a/gcc/ada/freeze.adb b/gcc/ada/freeze.adb
index 74d15b5..ff54188 100644
--- a/gcc/ada/freeze.adb
+++ b/gcc/ada/freeze.adb
@@ -3431,7 +3431,7 @@ package body Freeze is
          Check_Address_Clause (E);
 
          --  Similar processing is needed for aspects that may affect object
-         --  layout, like Alignment, if there is an initialization expression.
+         --  layout, like Address, if there is an initialization expression.
          --  We don't do this if there is a pragma Linker_Section, because it
          --  would prevent the back end from statically initializing the
          --  object; we don't want elaboration code in that case.
diff --git a/gcc/ada/sem_ch13.adb b/gcc/ada/sem_ch13.adb
index 7445536..5937ce2 100644
--- a/gcc/ada/sem_ch13.adb
+++ b/gcc/ada/sem_ch13.adb
@@ -2861,17 +2861,30 @@ package body Sem_Ch13 is
                   if A_Id in Boolean_Aspects and then No (Expr) then
                      Delay_Required := False;
 
-                  --  For non-Boolean aspects, don't delay if integer literal,
-                  --  unless the aspect is Alignment, which affects the
-                  --  freezing of an initialized object.
+                  --  For non-Boolean aspects, don't delay if integer literal
 
                   elsif A_Id not in Boolean_Aspects
-                    and then A_Id /= Aspect_Alignment
                     and then Present (Expr)
                     and then Nkind (Expr) = N_Integer_Literal
                   then
                      Delay_Required := False;
 
+                  --  For Alignment and various Size aspects, don't delay for
+                  --  an attribute reference whose prefix is Standard, for
+                  --  example Standard'Maximum_Alignment or Standard'Word_Size.
+
+                  elsif (A_Id = Aspect_Alignment
+                          or else A_Id = Aspect_Component_Size
+                          or else A_Id = Aspect_Object_Size
+                          or else A_Id = Aspect_Size
+                          or else A_Id = Aspect_Value_Size)
+                    and then Present (Expr)
+                    and then Nkind (Expr) = N_Attribute_Reference
+                    and then Nkind (Prefix (Expr)) = N_Identifier
+                    and then Chars (Prefix (Expr)) = Name_Standard
+                  then
+                     Delay_Required := False;
+
                   --  All other cases are delayed
 
                   else
diff --git a/gcc/ada/sem_ch3.adb b/gcc/ada/sem_ch3.adb
index 435c69f..f0a588f 100644
--- a/gcc/ada/sem_ch3.adb
+++ b/gcc/ada/sem_ch3.adb
@@ -3668,7 +3668,7 @@ package body Sem_Ch3 is
       --  has aspects that require delayed analysis, the resolution of the
       --  aggregate must be deferred to the freeze point of the object. This
       --  special processing was created for address clauses, but it must
-      --  also apply to Alignment. This must be done before the aspect
+      --  also apply to address aspects. This must be done before the aspect
       --  specifications are analyzed because we must handle the aggregate
       --  before the analysis of the object declaration is complete.
 
@@ -3896,7 +3896,7 @@ package body Sem_Ch3 is
             while Present (A) loop
                A_Id := Get_Aspect_Id (Chars (Identifier (A)));
 
-               if A_Id = Aspect_Alignment or else A_Id = Aspect_Address then
+               if A_Id = Aspect_Address then
 
                   --  Set flag on object entity, for later processing at
                   --  the freeze point.