Message-Id: <199909090422.MAA24404@eastgate.cyberway.com.sg>
From: "Rob Kramer" <robk AT cyberway DOT com DOT sg>
To: djgpp AT delorie DOT com
Date: Thu, 9 Sep 1999 12:20:58 +0800
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Subject: GCC 2.95 global string crashes on 386..
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Reply-To: djgpp AT delorie DOT com

Hi all,

For some reason using a global STL 'string' crashes my program if run on a 
386 machine. Take the following testcase:

-----------
#include <iostream>
#include <string>

string foo = "bar";

void main()
{
  cout << "test: " << foo << endl;
}
-----------

Compiled with 'gpp -o test.exe test.cc'  (gcc 2.95, bnu 291), this crashes:


-----------
Exiting due to signal SIGILL
Invalid Opcode at eip=00002052
eax=ffffffff ebx=00021e4c ecx=00021e4c edx=00021e54 esi=00021cdc 
edi=00000003
ebp=000af9dc esp=000af9c4 program=test.exe
cs: sel=00e7  base=10060000  limit=000bffff
ds: sel=00ef  base=10060000  limit=000bffff
es: sel=00ef  base=10060000  limit=000bffff
fs: sel=00cf  base=000391a0  limit=0000ffff
gs: sel=00ff  base=00000000  limit=0010ffff
ss: sel=00ef  base=10060000  limit=000bffff
App stack: [000afb50..0002fb50]  Exceptn stack: [0002fa2c..0002daec]

Call frame traceback EIPs:
  0x00002052 basic_string<char, string_char_traits<char>, 
__default_alloc_template<false, 0> >::Rep::release(void)+18, line 87 of 
test.cc
  0x00001e69 basic_string<char, string_char_traits<char>, 
__default_alloc_template<false, 0> >::repup(basic_string<char, 
string_char_traits<char>, __default_alloc_template<false, 0> >::Rep *)+37, 
line 147 of test.cc
  0x00001b40 basic_string<char, string_char_traits<char>, 
__default_alloc_template<false, 0> >::replace(unsigned long, unsigned long, 
char const *, unsigned long)+348, line 168 of test.cc
  0x00002185 basic_string<char, string_char_traits<char>, 
__default_alloc_template<false, 0> >::assign(char const *, unsigned 
long)+33, line 214 of test.cc
  0x0000209b basic_string<char, string_char_traits<char>, 
__default_alloc_template<false, 0> >::assign(char const *)+39, line 216 of 
test.cc
  0x00001ef6 basic_string<char, string_char_traits<char>, 
__default_alloc_template<false, 0> >::basic_string(char const *)+42, line 
177 of test.cc
  0x00001bff ___static_initialization_and_destruction_0+39, line 7 of test.cc
  0x00002235 global constructors keyed to foo+21, line 3 of test.cc
  0x0001aa35 ___main+53
  0x00015c75 ___crt1_startup+141
-----------

The test works fine on 486++. Static member-strings won't work either. I 
tried to figure out what the SIGILL-invalid opcode was all about, but my fsdb 
keeps crashing on my old 386 if I get near the offending part (haven't got full 
DJGPP install there). 

This worked on 2.8.1, could someone try to compile this, and see if it works?

Thanks!

	Rob Kramer
	robk AT cyberway DOT com DOT sg