[Ada] Fix assertion failure on pragma Compile_Time_Error in generic unit

There is no point in validating 'Alignment or 'Size of an entity
declared in a generic unit after the back-end has been run, since such
an entity is not passed to the back-end, and this can even lead to an
assertion failure.

2018-11-14  Eric Botcazou  <ebotcazou@adacore.com>

gcc/ada/

	* sem_prag.adb (Process_Compile_Time_Warning_Or_Error): Don't
	register a compile-time warning or error for 'Alignment or 'Size
	of an entity declared in a generic unit.

gcc/testsuite/

	* gnat.dg/compile_time_error1.adb,
	gnat.dg/compile_time_error1.ads,
	gnat.dg/compile_time_error1_pkg.ads: New testcase.

From-SVN: r266127

6 files changed, 44 insertions, 0 deletions

diff --git a/gcc/ada/ChangeLog b/gcc/ada/ChangeLog
index d4dcd8c41d6..82329ac9a23 100644
--- a/gcc/ada/ChangeLog
+++ b/gcc/ada/ChangeLog
@@ -1,3 +1,9 @@
+2018-11-14  Eric Botcazou  <ebotcazou@adacore.com>
+
+	* sem_prag.adb (Process_Compile_Time_Warning_Or_Error): Don't
+	register a compile-time warning or error for 'Alignment or 'Size
+	of an entity declared in a generic unit.
+
 2018-11-14  Justin Squirek  <squirek@adacore.com>
 
 	* sem_ch8.adb (Use_One_Package): Add test for out-of-scope
diff --git a/gcc/ada/sem_prag.adb b/gcc/ada/sem_prag.adb
index a96d148ecbb..cda8629de68 100644
--- a/gcc/ada/sem_prag.adb
+++ b/gcc/ada/sem_prag.adb
@@ -7545,6 +7545,7 @@ package body Sem_Prag is
          begin
             if Nkind (N) = N_Attribute_Reference
               and then Is_Entity_Name (Prefix (N))
+              and then not Is_Generic_Unit (Scope (Entity (Prefix (N))))
             then
                declare
                   Attr_Id : constant Attribute_Id :=
diff --git a/gcc/testsuite/ChangeLog b/gcc/testsuite/ChangeLog
index c4d7657d7d1..00ad237ac25 100644
--- a/gcc/testsuite/ChangeLog
+++ b/gcc/testsuite/ChangeLog
@@ -1,3 +1,9 @@
+2018-11-14  Eric Botcazou  <ebotcazou@adacore.com>
+
+	* gnat.dg/compile_time_error1.adb,
+	gnat.dg/compile_time_error1.ads,
+	gnat.dg/compile_time_error1_pkg.ads: New testcase.
+
 2018-11-14  Justin Squirek  <squirek@adacore.com>
 
 	* gnat.dg/generic_pkg.adb: New testcase.
diff --git a/gcc/testsuite/gnat.dg/compile_time_error1.adb b/gcc/testsuite/gnat.dg/compile_time_error1.adb
new file mode 100644
index 00000000000..db55f587a2f
--- /dev/null
+++ b/gcc/testsuite/gnat.dg/compile_time_error1.adb
@@ -0,0 +1,7 @@
+--  { dg-do compile }
+
+package body Compile_Time_Error1 is
+
+  procedure Dummy is null;
+
+end Compile_Time_Error1;
diff --git a/gcc/testsuite/gnat.dg/compile_time_error1.ads b/gcc/testsuite/gnat.dg/compile_time_error1.ads
new file mode 100644
index 00000000000..f4f83338b2f
--- /dev/null
+++ b/gcc/testsuite/gnat.dg/compile_time_error1.ads
@@ -0,0 +1,13 @@
+with Compile_Time_Error1_Pkg;
+
+package Compile_Time_Error1 is
+
+  type Rec is record
+    I : Integer;
+  end record;
+
+  package Inst is new Compile_Time_Error1_Pkg (Rec);
+
+  procedure Dummy;
+
+end Compile_Time_Error1;
diff --git a/gcc/testsuite/gnat.dg/compile_time_error1_pkg.ads b/gcc/testsuite/gnat.dg/compile_time_error1_pkg.ads
new file mode 100644
index 00000000000..92238577246
--- /dev/null
+++ b/gcc/testsuite/gnat.dg/compile_time_error1_pkg.ads
@@ -0,0 +1,11 @@
+generic
+
+  type T is private;
+
+package Compile_Time_Error1_Pkg is
+
+  pragma Compile_Time_Error (T'Size not in 8 | 16 | 32, "type too large");
+
+  Data : T;
+
+end Compile_Time_Error1_Pkg;