[Bug libstdc++/61041] New: Cannot create std::tr1::variate_generator from variate_generator::engine(); engine_value_type error

[Bug libstdc++/61041] New: Cannot create std::tr1::variate_generator from variate_generator::engine(); engine_value_type error

[hstong at ca dot ibm.com]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=61041

            Bug ID: 61041
           Summary: Cannot create std::tr1::variate_generator from
                    variate_generator::engine(); engine_value_type error
           Product: gcc
           Version: 4.8.2
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: libstdc++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: hstong at ca dot ibm.com

http://gcc.gnu.org/onlinedocs/libstdc++/manual/status.html#status.iso.tr1 shows
that support for ISO/IEC DTR 19768 subclause 5.1.3 is available in libstdc++.

It seems that engine_value_type in libstdc++ is not defined such that it
matches 5.1.3 paragraph 2 (assuming the DTR is close enough to the TR):
The template argument for the parameter Engine shall be of the form U, U&, or
U*, where U denotes a class that satisfies all the requirements of a uniform
random number generator. The member engine_value_type shall name U.

The following small client for <tr1/random> generates error messages showing
that the engine_value_type typedef is some specialization of
std::tr1::__detail::_Adaptor and not the corresponding "U" for U& =
::EngineType.

### SOURCE:> cat engine_value_type.cc
#include <tr1/random>

typedef std::tr1::linear_congruential<unsigned, 1, 0, 2048> &EngineType;
typedef std::tr1::uniform_int<unsigned> DistType;

std::tr1::variate_generator<EngineType, DistType>
getWithNewDist(std::tr1::variate_generator<EngineType, DistType> &orig,
               const DistType &newDist) {
   return std::tr1::variate_generator<EngineType, DistType>(orig.engine(),
newDist);
}


### COMPILER INVOCATION AND OUTPUT:> g++ engine_value_type.cc
engine_value_type.cc: In function
‘std::tr1::variate_generator<std::tr1::linear_congruential<unsigned int, 1u,
0u, 2048u>&, std::tr1::uniform_int<unsigned int> >
getWithNewDist(std::tr1::variate_generator<std::tr1::linear_congruential<unsigned
int, 1u, 0u, 2048u>&, std::tr1::uniform_int<unsigned int> >&, const
DistType&)’:
engine_value_type.cc:8:83: error: no matching function for call to
‘std::tr1::variate_generator<std::tr1::linear_congruential<unsigned int, 1u,
0u, 2048u>&, std::tr1::uniform_int<unsigned int>
>::variate_generator(std::tr1::variate_generator<std::tr1::linear_congruential<unsigned
int, 1u, 0u, 2048u>&, std::tr1::uniform_int<unsigned int>
>::engine_value_type&, const DistType&)’
    return std::tr1::variate_generator<EngineType, DistType>(orig.engine(),
newDist);
                                                                               
   ^
engine_value_type.cc:8:83: note: candidates are:
In file included from
/usr/lib/gcc/x86_64-pc-cygwin/4.8.2/include/c++/tr1/random:47:0,
                 from engine_value_type.cc:1:
/usr/lib/gcc/x86_64-pc-cygwin/4.8.2/include/c++/tr1/random.h:252:7: note:
std::tr1::variate_generator<_Engine,
_Dist>::variate_generator(std::tr1::variate_generator<_Engine,
_Dist>::engine_type, std::tr1::variate_generator<_Engine,
_Dist>::distribution_type) [with _Engine =
std::tr1::linear_congruential<unsigned int, 1u, 0u, 2048u>&; _Dist =
std::tr1::uniform_int<unsigned int>; std::tr1::variate_generator<_Engine,
_Dist>::engine_type = std::tr1::linear_congruential<unsigned int, 1u, 0u,
2048u>&; std::tr1::variate_generator<_Engine, _Dist>::distribution_type =
std::tr1::uniform_int<unsigned int>]
       variate_generator(engine_type __eng, distribution_type __dist)
       ^
/usr/lib/gcc/x86_64-pc-cygwin/4.8.2/include/c++/tr1/random.h:252:7: note:   no
known conversion for argument 1 from
‘std::tr1::variate_generator<std::tr1::linear_congruential<unsigned int, 1u,
0u, 2048u>&, std::tr1::uniform_int<unsigned int> >::engine_value_type {aka
std::tr1::__detail::_Adaptor<std::tr1::linear_congruential<unsigned int, 1u,
0u, 2048u>&, std::tr1::uniform_int<unsigned int> >}’ to
‘std::tr1::variate_generator<std::tr1::linear_congruential<unsigned int, 1u,
0u, 2048u>&, std::tr1::uniform_int<unsigned int> >::engine_type {aka
std::tr1::linear_congruential<unsigned int, 1u, 0u, 2048u>&}’
/usr/lib/gcc/x86_64-pc-cygwin/4.8.2/include/c++/tr1/random.h:228:11: note:
std::tr1::variate_generator<std::tr1::linear_congruential<unsigned int, 1u, 0u,
2048u>&, std::tr1::uniform_int<unsigned int> >::variate_generator(const
std::tr1::variate_generator<std::tr1::linear_congruential<unsigned int, 1u, 0u,
2048u>&, std::tr1::uniform_int<unsigned int> >&)
     class variate_generator
           ^
/usr/lib/gcc/x86_64-pc-cygwin/4.8.2/include/c++/tr1/random.h:228:11: note:  
candidate expects 1 argument, 2 provided


### VERSION INFO:> g++ --version
g++ (GCC) 4.8.2
Copyright (C) 2013 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.
>From gcc-bugs-return-450418-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Sat May 03 01:00:35 2014
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From: "su at cs dot ucdavis.edu" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug tree-optimization/61042] New: ICE on valid code at -O3 on x86_64-linux-gnu
Date: Sat, 03 May 2014 01:00:00 -0000
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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=61042

            Bug ID: 61042
           Summary: ICE on valid code at -O3 on x86_64-linux-gnu
           Product: gcc
           Version: 4.10.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: tree-optimization
          Assignee: unassigned at gcc dot gnu.org
          Reporter: su at cs dot ucdavis.edu

The following code causes an ICE when compiled with the current gcc trunk at
-O3 on x86_64-linux-gnu in both 32-bit and 64-bit modes. 

It is a regression from 4.9.x. 

$ gcc-trunk -v
Using built-in specs.
COLLECT_GCC=gcc-trunk
COLLECT_LTO_WRAPPER=/usr/local/gcc-trunk/libexec/gcc/x86_64-unknown-linux-gnu/4.10.0/lto-wrapper
Target: x86_64-unknown-linux-gnu
Configured with: ../gcc-trunk/configure --prefix=/usr/local/gcc-trunk
--enable-languages=c,c++ --disable-werror --enable-multilib
Thread model: posix
gcc version 4.10.0 20140502 (experimental) [trunk revision 210000] (GCC) 
$ 
$ gcc-trunk -O2 -c small.c
$ gcc-4.9 -O3 -c small.c
$ 
$ gcc-trunk -O3 -c small.c
small.c: In function ‘foo’:
small.c:4:1: internal compiler error: Segmentation fault
 foo ()
 ^
0x95c21f crash_signal
        ../../gcc-trunk/gcc/toplev.c:337
0x9b07d5 bb_predicate
        ../../gcc-trunk/gcc/tree-if-conv.c:149
0x9b07d5 is_predicated
        ../../gcc-trunk/gcc/tree-if-conv.c:275
0x9b07d5 is_cond_scalar_reduction
        ../../gcc-trunk/gcc/tree-if-conv.c:1442
0x9b07d5 predicate_scalar_phi
        ../../gcc-trunk/gcc/tree-if-conv.c:1583
0x9b07d5 predicate_all_scalar_phis
        ../../gcc-trunk/gcc/tree-if-conv.c:1637
0x9b07d5 combine_blocks
        ../../gcc-trunk/gcc/tree-if-conv.c:1954
0x9b178e tree_if_conversion
        ../../gcc-trunk/gcc/tree-if-conv.c:2108
0x9b178e execute
        ../../gcc-trunk/gcc/tree-if-conv.c:2187
Please submit a full bug report,
with preprocessed source if appropriate.
Please include the complete backtrace with any bug report.
See <http://gcc.gnu.org/bugs.html> for instructions.
$ 


--------------------------


int a, b, c[1], d, f;

void
foo ()
{
  for (; b; b++)
    c[0] = c[f] && (d = a);
}
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From: "sgk at troutmask dot apl.washington.edu" <gcc-bugzilla@gcc.gnu.org>
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http://gcc.gnu.org/bugzilla/show_bug.cgi?ida002

--- Comment #8 from Steve Kargl <sgk at troutmask dot apl.washington.edu> ---
On Fri, May 02, 2014 at 02:24:40PM +0000, dominiq at lps dot ens.fr wrote:
>
> What is the best way to avoid the misleading "This check can be disabled with
> the option -fno-range-check" for integers? Use "This check can be disabled for
> floating point values with the option -fno-range-check"? or pass an extra
> argument to gfc_arith_error?
>
> While I am at it, should I do the same thing for "Arithmetic overflow" and
> friends? Should not "This check can be disabled with the option
> -fno-range-check" ends with a dot?

Traditional error messages did not end with punctuation.  When
error messages started to be more than a sentence, we needed
to punctuate the first sentence(s), and the last sentence was
left unpunctuated.

Instead of "This check ... ".  Simply use "See -fno-range-check".
Then gfortran.info can add a lengthy description about what
-fno-range-check does.

[Bug libstdc++/61041] Cannot create std::tr1::variate_generator from variate_generator::engine(); engine_value_type error

[redi at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=61041

Jonathan Wakely <redi at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |RESOLVED
         Resolution|---                         |WONTFIX

--- Comment #1 from Jonathan Wakely <redi at gcc dot gnu.org> ---
TR1 is moribund