[Bug c++/47971] New: [4.6 Regression] ICE: in tsubst_copy, at cp/pt.c:11725 on valid code

[zsojka at seznam dot cz]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=47971

           Summary: [4.6 Regression] ICE: in tsubst_copy, at cp/pt.c:11725
                    on valid code
           Product: gcc
           Version: 4.6.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
        AssignedTo: unassigned@gcc.gnu.org
        ReportedBy: zsojka@seznam.cz


Created attachment 23530
  --> http://gcc.gnu.org/bugzilla/attachment.cgi?id=23530
reduced testcase

$ gcc testcase.C
testcase.C: In constructor 'S< <template-parameter-1-1> >::S() [with
<template-parameter-1-1> = double]':
testcase.C:7:11:   instantiated from here
testcase.C:4:10: internal compiler error: in tsubst_copy, at cp/pt.c:11725
Please submit a full bug report,
with preprocessed source if appropriate.
See <http://gcc.gnu.org/bugs.html> for instructions.

(gdb) bt
#0  fancy_abort (file=0x120a958 "/mnt/svn/gcc-trunk/gcc/cp/pt.c", line=11725,
function=0x120fcbd "tsubst_copy")
    at /mnt/svn/gcc-trunk/gcc/diagnostic.c:892
#1  0x000000000055cb25 in tsubst_copy (t=<value optimized out>,
args=0x7ffff5bee050, complain=3, in_decl=0x7ffff5bec450)
    at /mnt/svn/gcc-trunk/gcc/cp/pt.c:11725
#2  0x000000000055ff61 in tsubst_copy_and_build (t=0x7ffff5bdc690,
args=0x7ffff5bee050, complain=3, in_decl=0x7ffff5bec450, function_p=0 '\000', 
    integral_constant_expression_p=<value optimized out>) at
/mnt/svn/gcc-trunk/gcc/cp/pt.c:13382
#3  0x000000000055fbab in tsubst_copy_and_build (t=0x7ffff5bc8840,
args=0x7ffff5bee050, complain=3, in_decl=0x7ffff5bec450, 
    function_p=<value optimized out>, integral_constant_expression_p=0 '\000')
at /mnt/svn/gcc-trunk/gcc/cp/pt.c:12980
#4  0x00000000005608a2 in tsubst_copy_and_build (t=0x7ffff5bc8880,
args=0x7ffff5bee050, complain=3, in_decl=0x7ffff5bec450, function_p=0 '\000', 
    integral_constant_expression_p=<value optimized out>) at
/mnt/svn/gcc-trunk/gcc/cp/pt.c:12862
#5  0x0000000000554e39 in tsubst_expr (t=0x7ffff5bc8880, args=0x7ffff5bee050,
complain=3, in_decl=0x7ffff5bec450, 
    integral_constant_expression_p=0 '\000') at
/mnt/svn/gcc-trunk/gcc/cp/pt.c:12422
#6  0x0000000000555bc9 in tsubst_expr (t=0x7ffff7ecea80, args=0x7ffff5bee050,
complain=3, in_decl=0x7ffff5bec450, 
    integral_constant_expression_p=0 '\000') at
/mnt/svn/gcc-trunk/gcc/cp/pt.c:11998
#7  0x0000000000554ee9 in tsubst_expr (t=0x7ffff5bc8800, args=0x7ffff5bee050,
complain=3, in_decl=0x7ffff5bec450, 
    integral_constant_expression_p=0 '\000') at
/mnt/svn/gcc-trunk/gcc/cp/pt.c:12163
#8  0x0000000000555505 in tsubst_expr (t=<value optimized out>,
args=0x7ffff5bee050, complain=3, in_decl=0x7ffff5bec450, 
    integral_constant_expression_p=0 '\000') at
/mnt/svn/gcc-trunk/gcc/cp/pt.c:11984
#9  0x0000000000554ee9 in tsubst_expr (t=0x7ffff5bc87c0, args=0x7ffff5bee050,
complain=3, in_decl=0x7ffff5bec450, 
    integral_constant_expression_p=0 '\000') at
/mnt/svn/gcc-trunk/gcc/cp/pt.c:12163
#10 0x0000000000581fe2 in instantiate_decl (d=0x7ffff5bdf500, defer_ok=<value
optimized out>, expl_inst_class_mem_p=0 '\000')
    at /mnt/svn/gcc-trunk/gcc/cp/pt.c:17421
#11 0x0000000000589444 in instantiate_pending_templates (retries=<value
optimized out>) at /mnt/svn/gcc-trunk/gcc/cp/pt.c:17518
#12 0x00000000005b7942 in cp_write_global_declarations () at
/mnt/svn/gcc-trunk/gcc/cp/decl2.c:3684
#13 0x0000000000a2c998 in compile_file (argc=13, argv=0x7fffffffdbc8) at
/mnt/svn/gcc-trunk/gcc/toplev.c:591


Tested revisions:
r170622 - crash
4.5 r170013 - OK
4.4 r170013 - OK