[Bug c++/59937] New: [constexpr] bogus diagnostic "used in its own initializer"

[Bug c++/59937] New: [constexpr] bogus diagnostic "used in its own initializer"

[richard-gccbugzilla at metafoo dot co.uk]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=59937

            Bug ID: 59937
           Summary: [constexpr] bogus diagnostic "used in its own
                    initializer"
           Product: gcc
           Version: 4.9.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: richard-gccbugzilla at metafoo dot co.uk

GCC rejects this:

constexpr const char * const &r = "";
constexpr const char * const &s = r;

with this bogus diagnostic:

test.cpp:2:35: error: the value of ‘r’ is not usable in a constant expression
 constexpr const char * const &s = r;
                                   ^
test.cpp:1:31: note: ‘r’ used in its own initializer
 constexpr const char * const &r = "";
                               ^
>From gcc-bugs-return-441502-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Fri Jan 24 23:54:08 2014
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Subject: [Bug c++/59938] New: [C++11] Bogus "... is not a constant expression"
Date: Fri, 24 Jan 2014 23:54:00 -0000
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http://gcc.gnu.org/bugzilla/show_bug.cgi?idY938

            Bug ID: 59938
           Summary: [C++11] Bogus "... is not a constant expression"
           Product: gcc
           Version: unknown
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: ppluzhnikov at google dot com

Test:

struct Data { const char* const& name; };
constexpr Data d = { "" };


Using g++ (GCC) 4.9.0 20140122 (experimental):

g++ -c -std=c++11 t.cc
t.cc:2:25: error: 'const Data{(* & _ZGRL1d0)}' is not a constant expression
 constexpr Data d = { "" };
                         ^

[Bug c++/59937] [constexpr] bogus diagnostic "used in its own initializer"

[redi at gcc dot gnu.org]

[-- Warning: decoded text below may be mangled, UTF-8 assumed --]
[-- Attachment #1: Type: text/plain; charset="UTF-8", Size: 15427 bytes --]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=59937

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

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Keywords|                            |rejects-valid
             Status|UNCONFIRMED                 |NEW
   Last reconfirmed|                            |2014-07-02
     Ever confirmed|0                           |1

--- Comment #1 from Jonathan Wakely <redi at gcc dot gnu.org> ---
Maybe related:

template<typename T> constexpr bool truth(const T&) { return true; }

template<typename T>
void test()
{
  int i[1];
  constexpr bool untrue = !truth(i);
  static_assert(!untrue, "");
}

ce.cc: In function ‘void test()’:
ce.cc:8:3: error: non-constant condition for static assertion
   static_assert(!untrue, "");
   ^
ce.cc:8:3: error: the value of ‘untrue’ is not usable in a constant expression
ce.cc:7:18: note: ‘untrue’ used in its own initializer
   constexpr bool untrue = !truth(i);
                  ^
>From gcc-bugs-return-455480-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Jul 02 09:39:10 2014
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Subject: [Bug c++/61668] New: Division returns an error in some cases
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=61668

            Bug ID: 61668
           Summary: Division returns an error in some cases
           Product: gcc
           Version: unknown
            Status: UNCONFIRMED
          Severity: critical
          Priority: P3
         Component: c++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: ketelbinkje at gmail dot com

Created attachment 33043
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=33043&action=edit
A screen shot of the moment the error was detected

The issue:
The program wants to divide 59 by 100. The expected result is 0.59. The program
returns 0.58999999999999997. The next division r = dSeconds / (1000 * pow(10,
ceil(log10(x)))) returns the correct result.

Hardware:
HP 4600
Platform: Linux Mint 17 Cinnamon 64-bit
Cinamon version 2.2.13
Linux kernel 3.13.0-24-generic
Intel Xeon CPU 5140
Memory 7,8 GiB

Compiler and IDE:
g++ compiler version 4.8.2.
Code Blocks 13.12


The build log:

-------------- Clean: Debug in GCD (compiler: GNU GCC Compiler)---------------

Cleaned "GCD - Debug"

-------------- Build: Debug in GCD (compiler: GNU GCC Compiler)---------------

g++ -Wundef -Wunreachable-code -Weffc++ -std=c++11 -Wextra -Wall -g
-fexceptions -Wundef -Wunreachable-code -Wmissing-declarations -Wswitch-enum
-Wswitch-default -Weffc++ -std=c++11 -g  -c
/home/fradiavolo/Projects/GCD/c_circlenavigation.cpp -o
obj/Debug/c_circlenavigation.o
In file included from /home/fradiavolo/Projects/GCD/c_circlenavigation.h:4:0,
                 from /home/fradiavolo/Projects/GCD/c_circlenavigation.cpp:1:
/home/fradiavolo/Projects/GCD/geotools.h:57:54: warning: type qualifiers
ignored on function return type [-Wignored-qualifiers]
         const double m_Degrees_2_Radians(const double);
                                                      ^
/home/fradiavolo/Projects/GCD/geotools.h:58:54: warning: type qualifiers
ignored on function return type [-Wignored-qualifiers]
         const double m_Radians_2_Degrees(const double);
                                                      ^
In file included from /home/fradiavolo/Projects/GCD/c_circlenavigation.h:4:0,
                 from /home/fradiavolo/Projects/GCD/c_circlenavigation.cpp:1:
/home/fradiavolo/Projects/GCD/geotools.h:61:165: warning: type qualifiers
ignored on function return type [-Wignored-qualifiers]
         const bool m_Correct_GeoCoordinate(const string sCoordinate = "",
const CoordinateType::CoordinateProperty t =
CoordinateType::CoordinateProperty::Undefined);
                                                                               
                                                                               
     ^
/home/fradiavolo/Projects/GCD/geotools.h:64:169: warning: type qualifiers
ignored on function return type [-Wignored-qualifiers]
         const double m_ConvertCordinate_2_Double(const string sGeoCoordinate,
const CoordinateType::CoordinateProperty t =
CoordinateType::CoordinateProperty::Undefined);
                                                                               
                                                                               
         ^
/home/fradiavolo/Projects/GCD/geotools.h:67:34: warning: type qualifiers
ignored on function return type [-Wignored-qualifiers]
         const bool m_ErrFlag(void) {return ErrFlag; };
                                  ^
g++ -Wundef -Wunreachable-code -Weffc++ -std=c++11 -Wextra -Wall -g
-fexceptions -Wundef -Wunreachable-code -Wmissing-declarations -Wswitch-enum
-Wswitch-default -Weffc++ -std=c++11 -g  -c
/home/fradiavolo/Projects/GCD/geotools.cpp -o obj/Debug/geotools.o
In file included from /home/fradiavolo/Projects/GCD/geotools.cpp:1:0:
/home/fradiavolo/Projects/GCD/geotools.h:57:54: warning: type qualifiers
ignored on function return type [-Wignored-qualifiers]
         const double m_Degrees_2_Radians(const double);
                                                      ^
/home/fradiavolo/Projects/GCD/geotools.h:58:54: warning: type qualifiers
ignored on function return type [-Wignored-qualifiers]
         const double m_Radians_2_Degrees(const double);
                                                      ^
In file included from /home/fradiavolo/Projects/GCD/geotools.cpp:1:0:
/home/fradiavolo/Projects/GCD/geotools.h:61:165: warning: type qualifiers
ignored on function return type [-Wignored-qualifiers]
         const bool m_Correct_GeoCoordinate(const string sCoordinate = "",
const CoordinateType::CoordinateProperty t =
CoordinateType::CoordinateProperty::Undefined);
                                                                               
                                                                               
     ^
/home/fradiavolo/Projects/GCD/geotools.h:64:169: warning: type qualifiers
ignored on function return type [-Wignored-qualifiers]
         const double m_ConvertCordinate_2_Double(const string sGeoCoordinate,
const CoordinateType::CoordinateProperty t =
CoordinateType::CoordinateProperty::Undefined);
                                                                               
                                                                               
         ^
/home/fradiavolo/Projects/GCD/geotools.h:67:34: warning: type qualifiers
ignored on function return type [-Wignored-qualifiers]
         const bool m_ErrFlag(void) {return ErrFlag; };
                                  ^
/home/fradiavolo/Projects/GCD/geotools.cpp: In constructor
‘C_GeoTools::C_GeoTools()’:
/home/fradiavolo/Projects/GCD/geotools.cpp:11:1: warning: ‘C_GeoTools::ErrFlag’
should be initialized in the member initialization list [-Weffc++]
 C_GeoTools::C_GeoTools()
 ^
/home/fradiavolo/Projects/GCD/geotools.cpp:11:1: warning: ‘C_GeoTools::ErrMsg’
should be initialized in the member initialization list [-Weffc++]
/home/fradiavolo/Projects/GCD/geotools.cpp: At global scope:
/home/fradiavolo/Projects/GCD/geotools.cpp:34:67: warning: type qualifiers
ignored on function return type [-Wignored-qualifiers]
 const double C_GeoTools::m_Degrees_2_Radians(const double dDegrees)
                                                                   ^
/home/fradiavolo/Projects/GCD/geotools.cpp:48:67: warning: type qualifiers
ignored on function return type [-Wignored-qualifiers]
 const double C_GeoTools::m_Radians_2_Degrees(const double dRadians)
                                                                   ^
/home/fradiavolo/Projects/GCD/geotools.cpp:60:116: warning: type qualifiers
ignored on function return type [-Wignored-qualifiers]
 const bool C_GeoTools::m_Correct_GeoCoordinate(const string sCoordinate, const
CoordinateType::CoordinateProperty T)
                                                                               
                                    ^
/home/fradiavolo/Projects/GCD/geotools.cpp:121:125: warning: type qualifiers
ignored on function return type [-Wignored-qualifiers]
 const double C_GeoTools::m_ConvertCordinate_2_Double(const string
sGeoCoordinate, const CoordinateType::CoordinateProperty T)
                                                                               
                                             ^
/home/fradiavolo/Projects/GCD/geotools.cpp: In member function ‘const double
C_GeoTools::m_ConvertCordinate_2_Double(std::string,
C_GeoTools::CoordinateType::CoordinateProperty)’:
/home/fradiavolo/Projects/GCD/geotools.cpp:144:16: warning: variable ‘p’ set
but not used [-Wunused-but-set-variable]
         double p = 0.0;
                ^
/home/fradiavolo/Projects/GCD/geotools.cpp:145:16: warning: variable ‘q’ set
but not used [-Wunused-but-set-variable]
         double q = 0.0;
                ^
/home/fradiavolo/Projects/GCD/geotools.cpp:146:16: warning: variable ‘r’ set
but not used [-Wunused-but-set-variable]
         double r = 0.0;
                ^
g++ -Wundef -Wunreachable-code -Weffc++ -std=c++11 -Wextra -Wall -g
-fexceptions -Wundef -Wunreachable-code -Wmissing-declarations -Wswitch-enum
-Wswitch-default -Weffc++ -std=c++11 -g  -c
/home/fradiavolo/Projects/GCD/main.cpp -o obj/Debug/main.o
In file included from /home/fradiavolo/Projects/GCD/c_circlenavigation.h:4:0,
                 from /home/fradiavolo/Projects/GCD/main.cpp:1:
/home/fradiavolo/Projects/GCD/geotools.h:57:54: warning: type qualifiers
ignored on function return type [-Wignored-qualifiers]
         const double m_Degrees_2_Radians(const double);
                                                      ^
/home/fradiavolo/Projects/GCD/geotools.h:58:54: warning: type qualifiers
ignored on function return type [-Wignored-qualifiers]
         const double m_Radians_2_Degrees(const double);
                                                      ^
In file included from /home/fradiavolo/Projects/GCD/c_circlenavigation.h:4:0,
                 from /home/fradiavolo/Projects/GCD/main.cpp:1:
/home/fradiavolo/Projects/GCD/geotools.h:61:165: warning: type qualifiers
ignored on function return type [-Wignored-qualifiers]
         const bool m_Correct_GeoCoordinate(const string sCoordinate = "",
const CoordinateType::CoordinateProperty t =
CoordinateType::CoordinateProperty::Undefined);
                                                                               
                                                                               
     ^
/home/fradiavolo/Projects/GCD/geotools.h:64:169: warning: type qualifiers
ignored on function return type [-Wignored-qualifiers]
         const double m_ConvertCordinate_2_Double(const string sGeoCoordinate,
const CoordinateType::CoordinateProperty t =
CoordinateType::CoordinateProperty::Undefined);
                                                                               
                                                                               
         ^
/home/fradiavolo/Projects/GCD/geotools.h:67:34: warning: type qualifiers
ignored on function return type [-Wignored-qualifiers]
         const bool m_ErrFlag(void) {return ErrFlag; };
                                  ^
g++  -o bin/Debug/GCD obj/Debug/c_circlenavigation.o obj/Debug/geotools.o
obj/Debug/main.o   
Output file is bin/Debug/GCD with size 143,72 KB
Process terminated with status 0 (0 minute(s), 1 second(s))
0 error(s), 24 warning(s) (0 minute(s), 1 second(s))
>From gcc-bugs-return-455481-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Jul 02 09:40:32 2014
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From: "ketelbinkje at gmail dot com" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug c++/61668] Division returns an error in some cases
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https://gcc.gnu.org/bugzilla/show_bug.cgi?ida668

--- Comment #1 from Peter Ketel <ketelbinkje at gmail dot com> ---
Created attachment 33044
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id3044&actioníit
The next division returns the correct result

[Bug c++/59937] [constexpr] bogus diagnostic "used in its own initializer"

[jota.uve at hotmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=59937

Javier V. Gómez <jota.uve at hotmail dot com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |jota.uve at hotmail dot com

--- Comment #2 from Javier V. Gómez <jota.uve at hotmail dot com> ---
I found another case that worked in G++ 4.8.3 but fails in 4.9:

---------
main.cpp: 
---------
int main ()
{
    constexpr int n = 2;
    A<n> a;
    B b;
    b.foo();
}

---------
a.hpp: 
---------
template <size_t n> class A
{
    static constexpr size_t getN() {return n;}
};

---------
b.hpp: 
---------
class B 
{
    void foo ()
    {
        //has access to a A<n> object
        constexpr int n = a.getN();
        A<n> a2;
    }
};


Compiler output:
B.hpp: error: the value of ‘n’ is not usable in a constant expression
             A<n> a2;
               ^
B.hpp: note: ‘ndims’ used in its own initializer
             constexpr int n = a.getN();
                           ^
>From gcc-bugs-return-473185-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Jan 14 12:27:07 2015
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Subject: [Bug rtl-optimization/57518] [4.8 Regression] Redundant insn generated in LRA
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https://gcc.gnu.org/bugzilla/show_bug.cgi?idW518

Ramana Radhakrishnan <ramana at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |ramana at gcc dot gnu.org

--- Comment #12 from Ramana Radhakrishnan <ramana at gcc dot gnu.org> ---
(In reply to Jakub Jelinek from comment #11)
> GCC 4.8.4 has been released.

If this won't be backported to 4.8 why keep this open ?

Ramana

[Bug c++/59937] [constexpr] bogus diagnostic "used in its own initializer"

[redi at gcc dot gnu.org]

[-- Warning: decoded text below may be mangled, UTF-8 assumed --]
[-- Attachment #1: Type: text/plain; charset="UTF-8", Size: 6116 bytes --]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=59937

--- Comment #3 from Jonathan Wakely <redi at gcc dot gnu.org> ---
(In reply to Javier V. Gómez from comment #2)
> I found another case that worked in G++ 4.8.3 but fails in 4.9:

This example is complete nonsense. Why is it split across three files? Why
doesn't main.cpp include anything? Why is everything private? Why is 'a'
undeclared in B::foo()? Why does the diagnostic talk about 'ndims' which isn't
declared anywhere?

It's useless as a test or an example of the error.
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Subject: [Bug c++/59937] [constexpr] bogus diagnostic "used in its own initializer"
Date: Wed, 14 Jan 2015 12:52:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=59937

--- Comment #4 from Javier V. Gómez <jota.uve at hotmail dot com> ---
(In reply to Jonathan Wakely from comment #3)
> (In reply to Javier V. Gómez from comment #2)
> > I found another case that worked in G++ 4.8.3 but fails in 4.9:
> 
> This example is complete nonsense. Why is it split across three files? Why
> doesn't main.cpp include anything? Why is everything private? Why is 'a'
> undeclared in B::foo()? Why does the diagnostic talk about 'ndims' which
> isn't declared anywhere?
> 
> It's useless as a test or an example of the error.

I tried to simplify as much as possible the issue, since I detected the error
in a big piece of code. I didn't pretend to create a compilable example. ndims
is what I called n (copy and paste...).

The important point of my example is that constexpr int n = a.getN(); fails
when A::getN() just returns a template parameter value previously set by a
constexpr anywhere else.
>From gcc-bugs-return-473193-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Jan 14 12:53:49 2015
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Subject: [Bug rtl-optimization/902] x86 optimization bug with sibling call and -fomit-frame-pointer
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id2

--- Comment #12 from Yvan Roux <yroux at gcc dot gnu.org> ---
Author: yroux
Date: Wed Jan 14 12:53:04 2015
New Revision: 219597

URL: https://gcc.gnu.org/viewcvs?rev!9597&root=gcc&view=rev
Log:
2015-01-14  Yvan Roux  <yvan.roux@linaro.org>

    Fix Linaro PR #902

    Partial Backport from trunk r211798.
    2014-06-18  Radovan Obradovic  <robradovic@mips.com>
            Tom de Vries  <tom@codesourcery.com>

    * config/arm/arm.c (arm_emit_call_insn): Add IP and CC clobbers to
    CALL_INSN_FUNCTION_USAGE.

    Backport from trunk r209800.
    2014-04-25  Tom de Vries  <tom@codesourcery.com>

    * expr.c (clobber_reg_mode): New function.
    * expr.h (clobber_reg): New function.


Modified:
    branches/linaro/gcc-4_9-branch/gcc/ChangeLog.linaro
    branches/linaro/gcc-4_9-branch/gcc/config/arm/arm.c
    branches/linaro/gcc-4_9-branch/gcc/expr.c
    branches/linaro/gcc-4_9-branch/gcc/expr.h

[Bug c++/59937] [constexpr] bogus diagnostic "used in its own initializer"

[paolo.carlini at oracle dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=59937

--- Comment #5 from Paolo Carlini <paolo.carlini at oracle dot com> ---
This is fixed for 5.0. I'm adding the testcases and closing the bug.

[Bug c++/59937] [constexpr] bogus diagnostic "used in its own initializer"

[paolo at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=59937

--- Comment #6 from paolo at gcc dot gnu.org <paolo at gcc dot gnu.org> ---
Author: paolo
Date: Tue Jan 20 13:39:10 2015
New Revision: 219894

URL: https://gcc.gnu.org/viewcvs?rev=219894&root=gcc&view=rev
Log:
2015-01-20  Paolo Carlini  <paolo.carlini@oracle.com>

    PR c++/59937
    * g++.dg/cpp0x/constexpr-59937-1.C: New.
    * g++.dg/cpp0x/constexpr-59937-2.C: Likewise.

Added:
    trunk/gcc/testsuite/g++.dg/cpp0x/constexpr-59937-1.C
    trunk/gcc/testsuite/g++.dg/cpp0x/constexpr-59937-2.C
Modified:
    trunk/gcc/testsuite/ChangeLog

[Bug c++/59937] [constexpr] bogus diagnostic "used in its own initializer"

[paolo.carlini at oracle dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=59937

Paolo Carlini <paolo.carlini at oracle dot com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
         Resolution|---                         |FIXED
   Target Milestone|---                         |5.0

--- Comment #7 from Paolo Carlini <paolo.carlini at oracle dot com> ---
Done.