I compiled a C++ file with g++ and the compile hung and took up 100% of the CPU
when assembling the file.
The problem seems to have to do with an ".align" directive. If I comment the
".align" (which was generated by the compiler) out, it no longer hangs.
Additionally, if I manually add three ".byte 0" to pad before the alignment
directive, gas also no longer hangs.
I will try to post the entire ".s" file if I can. I can also email it to you on
request. The .s file is 4175620 bytes in size and the offending align directive
happens at about line 175141.
Here is a snippet of the end of the file with some comments that I have added.
This seems to be the ending part of a "gcc_except_table" section.
--------------- START SNIPPET ---------------
.uleb128 .LEHB10374-.LFB3498
.uleb128 .LEHE10374-.LEHB10374
.uleb128 .L14870-.LFB3498
.uleb128 0x0
.uleb128 .LEHB10375-.LFB3498
.uleb128 .LEHE10375-.LEHB10375
.uleb128 0x0
.uleb128 0x0
.LLSDACSE3498:
.byte 0x0
.byte 0x0
.byte 0x1
.byte 0x7d
.byte 0x1
.byte 0x7d
###############################################################################
# CM: The problem occurs here. Anything not commented was produced by g++.
#
# Assemble with "as -V -Qy --64 -o x.o x.s" and "as" hangs.
#
# TEST #1:
# I manually added the next three lines manually to check if alignment
# was the problem. Uncomment out the next three lines and "as" does not hang!
# .byte 0x0
# .byte 0x0
# .byte 0x0
#
# TEST #2:
# If you comment out the following align (make sure to comment out
# the three manually added .byte in TEST #1) that was generated
# by the compiler, "as" does not hang, too!
.align 4
.long DW.ref._ZTI11FmFleetings-.
.LLSDATT3498:
#
# Seems like a problem with alignment. The rest of this file has been
# chopped off as it is not relavent.
#
# System Information:
#
# Linux:
# cat /etc/redhat-release
# Red Hat Enterprise Linux Server release 5 (Tikanga)
#
# g++ --version
# g++ (GCC) 4.1.1 20070105 (Red Hat 4.1.1-52)
# Copyright (C) 2006 Free Software Foundation, Inc.
# This is free software; see the source for copying conditions. There is NO
# warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
#
# Version of "as":
# GNU assembler version 2.17.50.0.6-2.el5 (x86_64-redhat-linux) using BFD
version 2.17.50.0.6-2.el5 20061020
#
# uname -a
# Linux kendo 2.6.18-8.el5 #1 SMP Fri Jan 26 14:15:14 EST 2007 x86_64 x86_64
x86_64 GNU/Linux
#
# ldd `which as`
# libbfd-2.17.50.0.6-2.el5.so => /usr/lib64/libbfd-2.17.50.0.6-2.el5.so
(0x00000030dae00000)
# libc.so.6 => /lib64/libc.so.6 (0x00000030daa00000)
# /lib64/ld-linux-x86-64.so.2 (0x00000030da600000)
#
--------------- END SNIPPET ---------------
--
Summary: gas hangs when assembling g++ generated code
Product: binutils
Version: 2.17
Status: NEW
Severity: normal
Priority: P2
Component: gas
AssignedTo: unassigned at sources dot redhat dot com
ReportedBy: cayminfo-ec at yahoo dot com
CC: bug-binutils at gnu dot org
GCC build triplet: x86_64-redhat-linux
GCC host triplet: x86_64-redhat-linux
GCC target triplet: x86_64-redhat-linux
http://sourceware.org/bugzilla/show_bug.cgi?id=6935
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