[Bug c++/47347] New: "pragma GCC diagnostic ignored" has no effect sometimes

[Bug c++/47347] New: "pragma GCC diagnostic ignored" has no effect sometimes

[gcc at dpinol dot com]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=47347

           Summary: "pragma GCC diagnostic ignored" has no effect
                    sometimes
           Product: gcc
           Version: 4.5.1
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
        AssignedTo: unassigned@gcc.gnu.org
        ReportedBy: gcc@dpinol.com


The code below produces warning "warning: unused parameter ‘a’
[-Wunused-parameter]" were it shouldn't, since this diagnostic should be
ignored.
If we remove the final line, the warning does not appear, but I understand that
a pragma should not affect previous lines.

#pragma GCC diagnostic ignored "-Wunused-parameter"

#include <vector>

template <class ContainerAllocator>
struct KeyValue
{
public:
  virtual ~KeyValue()
  {
  }

  virtual void serialize(int a) const
  {
  }
};

void f()
{
  std::vector< KeyValue<int >  >  values;
}
#pragma GCC diagnostic warning "-Wunused-parameter"

[Bug c++/47347] "pragma GCC diagnostic ignored" has no effect sometimes

[redi at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=47347

--- Comment #1 from Jonathan Wakely <redi at gcc dot gnu.org> 2011-01-18 17:32:39 UTC ---
reduced:

#pragma GCC diagnostic ignored "-Wunused-parameter"

template <class>
struct KeyValue
{
  virtual void serialize(int a) const
  {
  }
};

void f()
{
  KeyValue<int>  values;
}
#pragma GCC diagnostic warning "-Wunused-parameter"


The template instantiation is at the end of the file, after the warning has
been re-enabled.

There's no warning with 4.6.0

[Bug c++/47347] "pragma GCC diagnostic ignored" has no effect for templates

[manu at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=47347

Manuel López-Ibáñez <manu at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |RESOLVED
                 CC|                            |manu at gcc dot gnu.org
      Known to work|                            |4.6.0
         Resolution|---                         |FIXED
            Summary|"pragma GCC diagnostic      |"pragma GCC diagnostic
                   |ignored" has no effect      |ignored" has no effect for
                   |sometimes                   |templates

--- Comment #2 from Manuel López-Ibáñez <manu at gcc dot gnu.org> ---
It works for me in GCC 4.9.

I think this was fixed when we introduce the push/pop pragmas. Now we store the
ranges forever, so it doesn't matter when the warning is given, only that the
location of the warning is the correct one.
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From: "glisse at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug inline-asm/59155] New: ICE: in reg_overlap_mentioned_p, at rtlanal.c:1473
Date: Sat, 16 Nov 2013 20:10:00 -0000
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http://gcc.gnu.org/bugzilla/show_bug.cgi?idY155

            Bug ID: 59155
           Summary: ICE: in reg_overlap_mentioned_p, at rtlanal.c:1473
           Product: gcc
           Version: 4.9.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: inline-asm
          Assignee: unassigned at gcc dot gnu.org
          Reporter: glisse at gcc dot gnu.org
            Target: x86_64-unknown-linux-gnu

double f(double x){
  asm volatile("":"+X"(x));
  return x;
}
double g(double x,double y){
  return f(f(x)+f(y));
}

compiled with -O2:

a.c: In function 'g':
a.c:7:1: internal compiler error: in reg_overlap_mentioned_p, at rtlanal.c:1473
 }
 ^
0x967015 reg_overlap_mentioned_p(rtx_def const*, rtx_def const*)
    /data/repos/gcc/pristine/gcc/rtlanal.c:1473
0x7cde02 match_asm_constraints_1
    /data/repos/gcc/pristine/gcc/function.c:7164
0x7cdfda rest_of_match_asm_constraints
    /data/repos/gcc/pristine/gcc/function.c:7207
0x7cdfda execute
    /data/repos/gcc/pristine/gcc/function.c:7239
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