diff options
Diffstat (limited to 'gcc')
| -rw-r--r-- | gcc/ada/gnat_rm.texi | 4 | ||||
| -rw-r--r-- | gcc/ada/sem_attr.adb | 7 |
2 files changed, 11 insertions, 0 deletions
diff --git a/gcc/ada/gnat_rm.texi b/gcc/ada/gnat_rm.texi index 0d2d0ff28b5..69baaa202c2 100644 --- a/gcc/ada/gnat_rm.texi +++ b/gcc/ada/gnat_rm.texi @@ -5803,6 +5803,10 @@ package body Old_Pkg is end Old_Pkg; @end smallexample +@noindent +Note that it is allowed to apply 'Old to a constant entity, but this will +result in a warning, since the old and new values will always be the same. + @node Passed_By_Reference @unnumberedsec Passed_By_Reference @cindex Parameters, when passed by reference diff --git a/gcc/ada/sem_attr.adb b/gcc/ada/sem_attr.adb index 0cb2ace755e..14f9102d369 100644 --- a/gcc/ada/sem_attr.adb +++ b/gcc/ada/sem_attr.adb @@ -3501,6 +3501,13 @@ package body Sem_Attr is Error_Attr ("attribute % cannot apply to limited objects", P); end if; + if Is_Entity_Name (P) + and then Is_Constant_Object (Entity (P)) + then + Error_Msg_N + ("?attribute Old applied to constant has no effect", P); + end if; + -- Check that the expression does not refer to local entities Check_Local : declare |