[cfe-users] Help! Can not disable -Wsign-conversion!

[David Blaikie]

On Sat, Sep 7, 2013 at 8:57 AM, Fan Yu <tianjiao08 at gmail.com> wrote:

> Hi, I got a problem when using clang++ 3.2 at my C++ project.
>
> I use CXXFLAGS like :
>
> -- CXX_FLAGS = -g -D_FILE_OFFSET_BITS=64 -Wall -Wextra -Werror
> -Wno-error=sign-conversion -Wconversion -Wno-sign-conversion
> -Wno-unused-parameter -Wold-style-cast -Woverloaded-virtual -Wpointer-arith
> -Wshadow -Wwrite-strings -march=native -Wno-null-conversion
> -Wno-tautological-compare -Wno-unused-function -std=c++0x -O0
>

Are you sure those flags are actually getting passed to your compile
command?


>
> I use -Wno-sign-conversion to disable the warning, but I still got the
> error, How can I disable it, anyone can help me? thank you
> /home/ubuntu/claire/claire-common/claire/common/eventloop/poller/EPollPoller.cc:112:13:
> error: implicit conversion changes signedness: 'int' to 'unsigned int'
>       [-Werror,-Wsign-conversion]
>         if (channel->events() & ~(got))
>             ^~~~~~~~~~~~~~~~~ ~
> /home/ubuntu/claire/claire-common/claire/common/eventloop/poller/EPollPoller.cc:132:41:
> error: implicit conversion changes signedness: 'uint32_t' (aka 'unsigned
> int') to 'int'
>       [-Werror,-Wsign-conversion]
>         channel->set_revents(events_[i].events);
>         ~~~~~~~              ~~~~~~~~~~~^~~~~~
> /home/ubuntu/claire/claire-common/claire/common/eventloop/poller/EPollPoller.cc:138:27:
> error: implicit conversion changes signedness: 'int' to 'size_type' (aka
> 'unsigned long')
>       [-Werror,-Wsign-conversion]
>         events_.resize(cnt*2);
>         ~~~~~~~        ~~~^~
> /home/ubuntu/claire/claire-common/claire/common/eventloop/poller/EPollPoller.cc:143:73:
> error: implicit conversion changes signedness: 'const int' to 'size_type'
>       (aka 'unsigned long') [-Werror,-Wsign-conversion]
>         if (static_cast<size_t>((*it)) < channels_.size() &&
> !channels_[*it].channel->IsNoneEvent())
>                                                               ~~~~~~~~~ ^~~
> /home/ubuntu/claire/claire-common/claire/common/eventloop/poller/EPollPoller.cc:145:42:
> error: implicit conversion changes signedness: 'const int' to 'size_type'
>       (aka 'unsigned long') [-Werror,-Wsign-conversion]
>             actives->push_back(channels_[*it].channel);
>                                ~~~~~~~~~ ^~~
>
>
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