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119 lines
4.8 KiB
Diff
119 lines
4.8 KiB
Diff
From http://sources.redhat.com/ml/binutils/2004-08/msg00190.html
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Date: Tue, 17 Aug 2004 12:04:29 +0200
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From: Jakub Jelinek <jakub at redhat dot com>
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To: binutils at sources dot redhat dot com
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Subject: [PATCH] Fix `defined in discarded section' errors when building ia64 gcc
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Message-ID: <20040817100429.GL30497@sunsite.ms.mff.cuni.cz>
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Reply-To: Jakub Jelinek <jakub at redhat dot com>
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References: <20040817090201.GK30497@sunsite.ms.mff.cuni.cz>
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In-Reply-To: <20040817090201 dot GK30497 at sunsite dot ms dot mff dot cuni dot cz>
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On Tue, Aug 17, 2004 at 11:02:01AM +0200, Jakub Jelinek wrote:
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> Current gcc 3.4.x (at least gcc-3_4-rhl-branch) doesn't build with CVS
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> binutils (nor 2.15.91.0.2).
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> The problem is that libstdc++.so linking fails with:
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> `.gnu.linkonce.t._ZNSdD2Ev' referenced in section `.gnu.linkonce.ia64unw._ZNSdD2Ev' of .libs/sstream-inst.o: defined in discarded section `.gnu.linkonce.t._ZNSdD2Ev' of .libs/sstream-inst.o
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> The problem is that both io-inst.s and sstream-inst.s have
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> .gnu.linkonce.t._ZNSdD2Ev definition, but because io-inst.cc
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> also instantiates some templates sstream-inst.cc doesn't instantiate,
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> the inliner can do a better job in io-inst.cc.
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> The result is that _ZNSdD2Ev in io-inst.cc is a leaf routine, while
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> it is not in sstream-inst.cc (in assembly,
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> _ZNSdD2Ev in io-inst.s starts with .prologue and no .save directives,
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> while _ZNSdD2Ev] in sstream-inst.s has .prologue 12, 35 and some
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> .save directives.
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> IA-64 ABI allows leaf routines to have no unwind section at all,
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> which means .gnu.linkonce.ia64unw._ZNSdD2Ev is not created in
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> io-inst.o at all and as .gnu.linkonce.t._ZNSdD2Ev comes first
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> and wins, .gnu.linkonce.ia64unw._ZNSdD2Ev in sstream.o suddenly
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> references a discarded section.
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>
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> Not sure what should be done here, but certainly the compiler
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> isn't at fault here, it is a binutils problem.
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> One fix could be to create empty .gnu.linkonce.ia64unw.* section
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> in assembler, another special case ia64 unwind sections in the linker.
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Here is a patch for the first possibility.
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It certainly makes libstdc++.so to link and even the unwind info looks
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good on brief skimming.
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2004-08-17 Jakub Jelinek <jakub@redhat.com>
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* config/tc-ia64.c (start_unwind_section): Add linkonce_empty
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argument, don't do anything if current section is not
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.gnu.linkonce.t.* and linkonce_empty is set.
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(generate_unwind_image, dot_endp): Adjust callers, call
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start_unwind_section (*, 1) if nothing will be put into the
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section.
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--- binutils/gas/config/tc-ia64.c.jj 2004-07-30 11:42:24.000000000 +0200
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+++ binutils/gas/config/tc-ia64.c 2004-08-17 13:45:04.288173205 +0200
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@@ -1,5 +1,6 @@
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/* tc-ia64.c -- Assembler for the HP/Intel IA-64 architecture.
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- Copyright 1998, 1999, 2000, 2001, 2002, 2003 Free Software Foundation, Inc.
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+ Copyright 1998, 1999, 2000, 2001, 2002, 2003, 2004
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+ Free Software Foundation, Inc.
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Contributed by David Mosberger-Tang <davidm@hpl.hp.com>
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This file is part of GAS, the GNU Assembler.
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@@ -3297,7 +3298,7 @@ static char *special_linkonce_name[] =
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};
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static void
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-start_unwind_section (const segT text_seg, int sec_index)
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+start_unwind_section (const segT text_seg, int sec_index, int linkonce_empty)
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{
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/*
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Use a slightly ugly scheme to derive the unwind section names from
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@@ -3359,6 +3360,8 @@ start_unwind_section (const segT text_se
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prefix = special_linkonce_name [sec_index - SPECIAL_SECTION_UNWIND];
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suffix += sizeof (".gnu.linkonce.t.") - 1;
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}
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+ else if (linkonce_empty)
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+ return;
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prefix_len = strlen (prefix);
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suffix_len = strlen (suffix);
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@@ -3444,7 +3447,7 @@ generate_unwind_image (const segT text_s
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expressionS exp;
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bfd_reloc_code_real_type reloc;
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- start_unwind_section (text_seg, SPECIAL_SECTION_UNWIND_INFO);
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+ start_unwind_section (text_seg, SPECIAL_SECTION_UNWIND_INFO, 0);
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/* Make sure the section has 4 byte alignment for ILP32 and
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8 byte alignment for LP64. */
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@@ -3485,6 +3488,8 @@ generate_unwind_image (const segT text_s
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unwind.personality_routine = 0;
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}
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}
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+ else
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+ start_unwind_section (text_seg, SPECIAL_SECTION_UNWIND_INFO, 1);
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free_saved_prologue_counts ();
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unwind.list = unwind.tail = unwind.current_entry = NULL;
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@@ -4164,7 +4169,7 @@ dot_endp (dummy)
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subseg_set (md.last_text_seg, 0);
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unwind.proc_end = expr_build_dot ();
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- start_unwind_section (saved_seg, SPECIAL_SECTION_UNWIND);
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+ start_unwind_section (saved_seg, SPECIAL_SECTION_UNWIND, 0);
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/* Make sure that section has 4 byte alignment for ILP32 and
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8 byte alignment for LP64. */
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@@ -4204,6 +4209,9 @@ dot_endp (dummy)
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bytes_per_address);
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}
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+ else
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+ start_unwind_section (saved_seg, SPECIAL_SECTION_UNWIND, 1);
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+
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subseg_set (saved_seg, saved_subseg);
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/* Parse names of main and alternate entry points and set symbol sizes. */
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Jakub
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