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port-arm/39153: gcc can't generate code for arm thumb instruction set

>Number:         39153
>Category:       port-arm
>Synopsis:       gcc can't generate code for arm thumb instruction set
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    port-arm-maintainer
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Wed Jul 16 07:00:00 +0000 2008
>Originator:     Ilya Dogolazky
>Release:        4.99.66
Teleca Finland Oy
NetBSD  4.99.66 NetBSD 4.99.66 (TISDP2420) #109: Mon Jul 14 20:34:51 EEST 2008  
I'm trying to compile a simple C++ program for Thumb instruction set with the 
flag -fPIC (the compiler version is 4.1.3 20080202). An internal compiler error 
in thumb_find_work_register, at config/arm/arm.c:3348 occurs.
1. Create a file named error.cpp as follows:
#include <string>
class A
  char x1;
  std::string x2, x3;
  A(char, const std::string &, const std::string &);
A::A(char xx1, const std::string &xx2, const std::string &xx3) : x1(xx1), 
x2(xx2), x3(xx3)
{ }

2. Compile it with the command
g++ -fPIC -mthumb -mthumb-interwork -c ./error.cpp

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