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Define MAX_OFILE_ALIGNMENT for Tru64 UNIX

Message ID yddvcyr3gyz.fsf@manam.CeBiTec.Uni-Bielefeld.DE
State New
Headers show

Commit Message

Rainer Orth April 6, 2011, 8:46 a.m. UTC 
The recent failure of 

FAIL: gcc.dg/torture/pr47975.c  -O0  (test for excess errors)

/vol/gcc/src/hg/trunk/local/gcc/testsuite/gcc.dg/torture/pr47975.c:4:40: warning: alignment of 'x' is greater than maximum object file alignment.  Using 16 [enabled by default]

prompted me to finally look at the alignment requirements of Alpha
ECOFF.  Currently, MAX_OFILE_ALIGNMENT isn't defined, so it defaults to
BIGGEST_ALIGNMENT, i.e. 16 bytes.  But the Tru64 UNIX Object File and
Symbol Table Format Specification document a maximum alignment of 64 kB:

http://h30097.www3.hp.com/docs/base_doc/DOCUMENTATION/V51B_HTML/SUPPDOCS/OBJSPEC/NV20XXXX.HTM#nav2-29

The following patch implements this and fixes not only the testcase
above, but a considerable number of others.

Bootstrapped without regression on alpha-dec-osf5.1b, installed on
mainline.  Will backport to the 4.5 and 4.6 branches.

	Rainer


2011-03-29  Rainer Orth  <ro@CeBiTec.Uni-Bielefeld.DE>

	* config/alpha/osf5.h (MAX_OFILE_ALIGNMENT): Define.
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Patch

diff --git a/gcc/config/alpha/osf5.h b/gcc/config/alpha/osf5.h
--- a/gcc/config/alpha/osf5.h
+++ b/gcc/config/alpha/osf5.h
@@ -1,7 +1,7 @@ 
 /* Definitions of target machine for GNU compiler, for DEC Alpha on
    Tru64 UNIX V5.1.
    Copyright (C) 1992, 1993, 1994, 1995, 1996, 1997, 1998, 2000, 2001,
-   2002, 2003, 2004, 2005, 2006, 2007, 2009, 2010
+   2002, 2003, 2004, 2005, 2006, 2007, 2009, 2010, 2011
    Free Software Foundation, Inc.
    Contributed by Richard Kenner (kenner@vlsi1.ultra.nyu.edu)
 
@@ -223,6 +223,10 @@  __enable_execute_stack (void *addr)					
 #define LD_INIT_SWITCH "-init"
 #define LD_FINI_SWITCH "-fini"
 
+/* From Tru64 UNIX Object File and Symbol Table Format Specification,
+   2.3.5 Alignment, p.19.  */
+#define MAX_OFILE_ALIGNMENT (64 * 1024 * BITS_PER_UNIT)
+
 /* Select a format to encode pointers in exception handling data.  CODE
    is 0 for data, 1 for code labels, 2 for function pointers.  GLOBAL is
    true if the symbol may be affected by dynamic relocations.