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[Bug c++/39936] New: -Wuninitialized false positive with unhelpful diagnostic
- From: "fang at csl dot cornell dot edu" <gcc-bugzilla at gcc dot gnu dot org>
- To: gcc-bugs at gcc dot gnu dot org
- Date: 28 Apr 2009 02:23:53 -0000
- Subject: [Bug c++/39936] New: -Wuninitialized false positive with unhelpful diagnostic
- Reply-to: gcc-bugzilla at gcc dot gnu dot org
g++-4.4 gives odd error about <anonymous> being uninitialized around a vector
resize().
// test case: tc_uninit.cc
#include <vector>
struct A {
double time;
size_t id;
A() { } // uninitialized
};
struct B {
typedef std::vector<A> array_type;
array_type array;
void
foo(void);
};
void
B::foo(void) {
array.resize(1);
}
% g++-4 -pipe -ansi -pedantic-errors -Wold-style-cast -Woverloaded-virtual -W
-Wextra -Wall -Wundef -Wshadow -Wno-unused-parameter -Wpointer-arith
-Wcast-qual -Wcast-align -Wconversion -Werror -std=c++0x -Wno-error=conversion
-g -O3 -Wno-long-long -c tc_uninit.cc -o tc_uninit.o
cc1plus: warnings being treated as errors
tc_uninit.cc: In member function 'void B::foo()':
tc_uninit.cc:21: error: '<anonymous>' is used uninitialized in this function
{standard input}:unknown:Undefined local symbol L__Znwm$stub
{standard input}:unknown:Undefined local symbol L__ZdlPv$stub
{standard input}:unknown:Undefined local symbol
L__ZSt20__throw_length_errorPKc$stub
Observations: while trying to reduce, when either member of A is removed, the
diagnostic ceases and successfully compiles.
Aside, is there a good way to suppress those unhelpful stdin diagnostics?
build/host: powerpc-apple-darwin8
--
Summary: -Wuninitialized false positive with unhelpful diagnostic
Product: gcc
Version: 4.4.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
AssignedTo: unassigned at gcc dot gnu dot org
ReportedBy: fang at csl dot cornell dot edu
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=39936