Build failure on the Reef release

[Yong Yuan <yycslab@xxxxxxxxx>]

Hi, 

I'm trying to build a DEBUG version of Ceph's reef-release branch on a virtual Ubuntu-LTS 22.04 running on Lima by following the README on Ceph's github repo. The build failed and the last CMake error was ""g++-11: error: unrecognized command-line option '-Wimplicit-const-int-float-conversion'". Could anyone please help me figure out I can do to track down and fix the compilation error? Below are more details. 

The system configuration is as follows: 

> uname -a
Linux lima-ceph-dev 5.15.0-86-generic #96-Ubuntu SMP Wed Sep 20 08:23:49 UTC 2023 x86_64 x86_64 x86_64 GNU/Linux

> lsb_release -a
No LSB modules are available.
Distributor ID: Ubuntu
Description: Ubuntu 22.04.3 LTS
Release: 22.04
Codename: jammy

I followed the instructions on the README in Ceph's github repo: https://github.com/ceph/ceph, and the command ./do_cmake.sh failed at step [137/2150] that builds frontend dashboard with the error message "ninja: build stopped: subcommand failed." The last error logged in the file CMakeError.log has to do with "g++-11: error: unrecognized command-line option '-Wimplicit-const-int-float-conversion'". 

Below the last error message on the CMakeError.log: 

Performing C++ SOURCE FILE Test COMPILER_SUPPORTS_WARN_IMPLICIT_CONST_INT_FLOAT_CONVERSION failed with the following output:
Change Dir: /home/dyuan.linux/ceph/build/CMakeFiles/CMakeTmp

Run Build Command(s):/usr/bin/ninja cmTC_bab6d && [1/2] Building CXX object CMakeFiles/cmTC_bab6d.dir/src.cxx.o
FAILED: CMakeFiles/cmTC_bab6d.dir/src.cxx.o
/usr/bin/g++-11 -DCOMPILER_SUPPORTS_WARN_IMPLICIT_CONST_INT_FLOAT_CONVERSION  -fPIE   -Wimplicit-const-int-float-conversion -std=c++20 -o CMakeFiles/cmTC_bab6d.dir/src.cxx.o -c /home/dyuan.linux/ceph/build/CMakeFiles/CMakeTmp/src.cxx
g++-11: error: unrecognized command-line option '-Wimplicit-const-int-float-conversion'
ninja: build stopped: subcommand failed.

I also tried to build ceph on the docker quay.io/centos/centos and got the same g++ failure. 

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