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[Ada] Improved handling of circular compilation dependencies

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2019-12-12  Steve Baird  <baird@adacore.com>

gcc/ada/

	* sem_ch10.adb (Install_With_Clause): Check for the case of a
	circular dependency involving a predefined (or GNAT-defined)
	unit and handle that case by generating an appropropriate error
	message.

From-SVN: r279299
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Steve Baird 2019-12-12 10:03:26 +00:00 committed by Pierre-Marie de Rodat
parent 4cdd4a33f4
commit fbb076f4da
2 changed files with 21 additions and 0 deletions
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7
gcc/ada/ChangeLog
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@ -1,3 +1,10 @@
2019-12-12 Steve Baird <baird@adacore.com>
* sem_ch10.adb (Install_With_Clause): Check for the case of a
circular dependency involving a predefined (or GNAT-defined)
unit and handle that case by generating an appropropriate error
message.
2019-12-12 Gary Dismukes <dismukes@adacore.com>
* sem_ch4.adb, sem_res.adb: Minor reformatting.

14
gcc/ada/sem_ch10.adb
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@ -5336,6 +5336,20 @@ package body Sem_Ch10 is
Error_Msg_N
("instantiation depends on itself", Name (With_Clause));
elsif not Analyzed (Uname)
and then Is_Internal_Unit (Current_Sem_Unit)
and then not Is_Visible_Lib_Unit (Uname)
and then No (Scope (Uname))
then
if Is_Predefined_Unit (Current_Sem_Unit) then
Error_Msg_N
("predefined unit depends on itself", Name (With_Clause));
else
Error_Msg_N
("GNAT-defined unit depends on itself", Name (With_Clause));
end if;
return;
elsif not Is_Visible_Lib_Unit (Uname) then
-- Abandon processing in case of previous errors