deprecated warning with C++14 and external fmt lib

[ClausKlein]

bash-5.0$ make
mkdir -p ../.build-spdlog-Debug
cd ../.build-spdlog-Debug && cmake -G Ninja -Wdeprecated -Wdev \
      -DUSE_LCOV=OFF -DCMAKE_BUILD_TYPE=Debug \
      -DCMAKE_PREFIX_PATH="/tmp/staging/spdlog//usr/local;/usr/local;/opt/local;/usr" \
      -DCMAKE_STAGING_PREFIX=/usr/local \
      -DSPDLOG_BUILD_EXAMPLE_HO=off -DCMAKE_CXX_COMPILER_LAUNCHER=ccache \
      -DCMAKE_EXPORT_COMPILE_COMMANDS=ON -DCMAKE_C_COMPILER=/opt/local/bin/gcc -DCMAKE_CXX_COMPILER=/opt/local/bin/g++ /Users/clausklein/Workspace/cpp/spdlog
-- clang-tidy found: /Users/clausklein/scripts/run-clang-tidy.py
-- cmake source dir: /Users/clausklein/Workspace/cpp/spdlog
-- check target added
-- The CXX compiler identification is GNU 10.0.0
-- Checking whether CXX compiler has -isysroot
-- Checking whether CXX compiler has -isysroot - yes
-- Checking whether CXX compiler supports OSX deployment target flag
-- Checking whether CXX compiler supports OSX deployment target flag - yes
-- Check for working CXX compiler: /opt/local/bin/g++
-- Check for working CXX compiler: /opt/local/bin/g++ -- works
-- Detecting CXX compiler ABI info
-- Detecting CXX compiler ABI info - done
-- Detecting CXX compile features
-- Detecting CXX compile features - done
-- Build spdlog: 1.5.0
-- Looking for C++ include pthread.h
-- Looking for C++ include pthread.h - found
-- Performing Test CMAKE_HAVE_LIBC_PTHREAD
-- Performing Test CMAKE_HAVE_LIBC_PTHREAD - Success
-- Found Threads: TRUE  
-- Build type: Debug
-- Generating examples
-- Generating tests
-- Found PkgConfig: /usr/local/bin/pkg-config (found version "0.29.2") 
-- Checking for module 'libsystemd'
--   No package 'libsystemd' found
-- Generating install
-- Configuring done
-- Generating done
CMake Warning:
  Manually-specified variables were not used by the project:

    USE_LCOV


-- Build files have been written to: /Users/clausklein/Workspace/cpp/.build-spdlog-Debug
touch .configure-Debug
ln -sf /Users/clausklein/Workspace/cpp/spdlog/../.build-spdlog-Debug/compile_commands.json .
cmake --build ../.build-spdlog-Debug
[1/26] Building CXX object CMakeFiles/spdlog.dir/src/color_sinks.cpp.o
In file included from /Users/clausklein/Workspace/cpp/spdlog/src/color_sinks.cpp:24:
/Users/clausklein/Workspace/cpp/spdlog/include/spdlog/sinks/ansicolor_sink-inl.h: In member function 'void spdlog::sinks::ansicolor_sink<ConsoleMutex>::print_ccode_(const string_view_t&)':
/Users/clausklein/Workspace/cpp/spdlog/include/spdlog/sinks/ansicolor_sink-inl.h:114:53: warning: 'using char_type = char' is deprecated [-Wdeprecated-declarations]
  114 |     fwrite(color_code.data(), sizeof(string_view_t::char_type), color_code.size(), target_file_);
      |                                                     ^~~~~~~~~
In file included from /Users/clausklein/Workspace/cpp/spdlog/include/spdlog/fmt/fmt.h:25,
                 from /Users/clausklein/Workspace/cpp/spdlog/include/spdlog/common.h:38,
                 from /Users/clausklein/Workspace/cpp/spdlog/include/spdlog/logger.h:17,
                 from /Users/clausklein/Workspace/cpp/spdlog/include/spdlog/async_logger.h:17,
                 from /Users/clausklein/Workspace/cpp/spdlog/include/spdlog/async.h:17,
                 from /Users/clausklein/Workspace/cpp/spdlog/src/color_sinks.cpp:11:
/usr/local/include/fmt/core.h:316:9: note: declared here
  316 |   using char_type FMT_DEPRECATED_ALIAS = Char;
      |         ^~~~~~~~~
[25/26] Building CXX object tests/CMakeFiles/spdlog-utests.dir/main.cpp.o
FAILED: tests/CMakeFiles/spdlog-utests.dir/main.cpp.o 
ccache /opt/local/bin/g++  -DFMT_LOCALE -DSPDLOG_COMPILED_LIB -DSPDLOG_FMT_EXTERNAL -I/Users/clausklein/Workspace/cpp/spdlog/include -isystem /usr/local/include -g   -Wall -Wextra -Wconversion -pedantic -Wfatal-errors -std=c++14 -MD -MT tests/CMakeFiles/spdlog-utests.dir/main.cpp.o -MF tests/CMakeFiles/spdlog-utests.dir/main.cpp.o.d -o tests/CMakeFiles/spdlog-utests.dir/main.cpp.o -c /Users/clausklein/Workspace/cpp/spdlog/tests/main.cpp
In file included from /Users/clausklein/Workspace/cpp/spdlog/tests/main.cpp:2:
/Users/clausklein/Workspace/cpp/spdlog/tests/catch.hpp: In constructor 'Catch::AssertionHandler::AssertionHandler(const Catch::StringRef&, const Catch::SourceLineInfo&, Catch::StringRef, Catch::ResultDisposition::Flags)':
/Users/clausklein/Workspace/cpp/spdlog/tests/catch.hpp:6516:5: error: incorrect sharing of tree nodes
 6516 |     AssertionHandler::AssertionHandler
      |     ^~~~~~~~~~~~~~~~
compilation terminated due to -Wfatal-errors.
ninja: build stopped: subcommand failed.
make: *** [GNUmakefile:72: all] Fehler 1
bash-5.0$ 

cc (MacPorts gcc10 10-20200105_1) 10.0.0 20200105 (experimental)
Copyright (C) 2020 Free Software Foundation, Inc.
This is free software; see the source for copying conditions.  There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.

bash-5.0$ 

build.log

[gabime]

Fixed. Thanks