https://gcc.gnu.org/bugzilla/show_bug.cgi?id=106128
Bug ID: 106128
Summary: Bogus Warning on static_cast double to bool with
-Wfloat-equal
Product: gcc
Version: 13.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: mckelvey at maskull dot com
Target Milestone: ---
static_cast should not warn on its internals.
int main()
{
double xx(0.0);
// Warning
bool y = static_cast<bool>(xx);
// No warning
bool z = static_cast<bool>(0.0);
return 0;
}
g++ -Wfloat-equal -c test.cc
test.cc: In function ‘int main()’:
test.cc:6:36: warning: comparing floating-point with ‘==’ or ‘!=’ is unsafe
[-Wfloat-equal]
6 | bool y = static_cast<bool>(xx);
| ^~
$ /usr/local/bin/g++ -v
Using built-in specs.
COLLECT_GCC=/usr/local/bin/g++
COLLECT_LTO_WRAPPER=/usr/local/libexec/gcc/x86_64-pc-cygwin/13.0.0/lto-wrapper.exe
Target: x86_64-pc-cygwin
Configured with: ./configure --enable-languages=c,c++ --enable-threads=posix
Thread model: posix
Supported LTO compression algorithms: zlib zstd
gcc version 13.0.0 20220626 (experimental) (GCC)
$ uname
CYGWIN_NT-10.0-19044
Fails on gcc-11-20220624, gcc-12-20220625, gcc-13-20220626
