From: Eric Botcazou <ebotcazou@adacore.com>
Date: Thu, 14 Dec 2017 17:03:16 +0000 (+0000)
Subject: decl.c (gnat_to_gnu_field): Do not set the alignment of the enclosing record type... 
X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=9df60a5d915668f6b25fae0b76996e6bfd79e38c;p=gcc.git

decl.c (gnat_to_gnu_field): Do not set the alignment of the enclosing record type if it is not already set.

	* gcc-interface/decl.c (gnat_to_gnu_field): Do not set the alignment
	of the enclosing record type if it is not already set.

From-SVN: r255645
---

diff --git a/gcc/ada/ChangeLog b/gcc/ada/ChangeLog
index 3ac3bfba6e5..c87f4a22692 100644
--- a/gcc/ada/ChangeLog
+++ b/gcc/ada/ChangeLog
@@ -1,3 +1,8 @@
+2017-12-14  Eric Botcazou  <ebotcazou@adacore.com>
+
+	* gcc-interface/decl.c (gnat_to_gnu_field): Do not set the alignment
+	of the enclosing record type if it is not already set.
+
 2017-12-14  Eric Botcazou  <ebotcazou@adacore.com>
 
 	* gcc-interface/gigi.h (pad_type_has_rm_size): Declare.
diff --git a/gcc/ada/gcc-interface/decl.c b/gcc/ada/gcc-interface/decl.c
index f2da070ab0f..b014e687f6d 100644
--- a/gcc/ada/gcc-interface/decl.c
+++ b/gcc/ada/gcc-interface/decl.c
@@ -6890,7 +6890,8 @@ gnat_to_gnu_field (Entity_Id gnat_field, tree gnu_record_type, int packed,
 	{
 	  const unsigned int type_align = TYPE_ALIGN (gnu_field_type);
 
-	  if (TYPE_ALIGN (gnu_record_type) < type_align)
+	  if (TYPE_ALIGN (gnu_record_type)
+	      && TYPE_ALIGN (gnu_record_type) < type_align)
 	    SET_TYPE_ALIGN (gnu_record_type, type_align);
 
 	  /* If the position is not a multiple of the alignment of the type,
diff --git a/gcc/testsuite/ChangeLog b/gcc/testsuite/ChangeLog
index 4fac0015fd2..f87fb481899 100644
--- a/gcc/testsuite/ChangeLog
+++ b/gcc/testsuite/ChangeLog
@@ -1,3 +1,7 @@
+2017-12-14  Eric Botcazou  <ebotcazou@adacore.com>
+
+	* gnat.dg/alignment13.adb: New test.
+
 2017-12-14  Jakub Jelinek  <jakub@redhat.com>
 
 	PR lto/81406
diff --git a/gcc/testsuite/gnat.dg/alignment13.adb b/gcc/testsuite/gnat.dg/alignment13.adb
new file mode 100644
index 00000000000..dd0b25425f0
--- /dev/null
+++ b/gcc/testsuite/gnat.dg/alignment13.adb
@@ -0,0 +1,21 @@
+-- { dg-do run }
+-- { dg-options "-gnatws" }
+
+procedure Alignment13 is
+
+  type Rec is record
+    I1 : aliased Short_Integer;
+    I2 : Integer;
+  end record;
+
+  for Rec use record
+    I1 at 0 range 0 .. 15;
+  end record;
+
+  R : Rec;
+
+begin
+  if R.I2'Bit_Position /= 32 then
+    raise Program_Error;
+  end if;
+end;