./muduo/net/EventLoopThreadPool.cc:42:14: error: variable length arrays in C++ are a Clang extension

[uran0sH]

FAILED: muduo/net/CMakeFiles/muduo_net.dir/EventLoopThreadPool.cc.o
/home/hwy/llvm-project-18.1.8.src/build/bin/clang++  -I/home/hwy/.xmake/packages/b/boost/1.88.0/afc9e2caad7e4470944d468695c70205/include -I../ -g -DCHECK_PTHREAD_RETURN_VALUE -D_FILE_OFFSET_BITS=64 -Wall -Wextra -Werror -Wconversion -Wno-unused-parameter -Woverloaded-virtual -Wpointer-arith -Wshadow -Wwrite-strings -march=native -std=c++11 -Wno-null-dereference -Wno-sign-conversion -Wno-unused-local-typedef -Wthread-safety -O2 -DNDEBUG -fPIC -MD -MT muduo/net/CMakeFiles/muduo_net.dir/EventLoopThreadPool.cc.o -MF muduo/net/CMakeFiles/muduo_net.dir/EventLoopThreadPool.cc.o.d -o muduo/net/CMakeFiles/muduo_net.dir/EventLoopThreadPool.cc.o -c ../muduo/net/EventLoopThreadPool.cc
../muduo/net/EventLoopThreadPool.cc:42:14: error: variable length arrays in C++ are a Clang extension [-Werror,-Wvla-cxx-extension]
   42 |     char buf[name_.size() + 32];
      |              ^~~~~~~~~~~~~~~~~
../muduo/net/EventLoopThreadPool.cc:42:14: note: implicit use of 'this' pointer is only allowed within the evaluation of a call to a 'constexpr' member function
1 error generated.
[15/46] Building CXX object muduo/base/CMakeFiles/muduo_base.dir/TimeZone.cc.o
FAILED: muduo/base/CMakeFiles/muduo_base.dir/TimeZone.cc.o
/home/hwy/llvm-project-18.1.8.src/build/bin/clang++  -I/home/hwy/.xmake/packages/b/boost/1.88.0/afc9e2caad7e4470944d468695c70205/include -I../ -g -DCHECK_PTHREAD_RETURN_VALUE -D_FILE_OFFSET_BITS=64 -Wall -Wextra -Werror -Wconversion -Wno-unused-parameter -Woverloaded-virtual -Wpointer-arith -Wshadow -Wwrite-strings -march=native -std=c++11 -Wno-null-dereference -Wno-sign-conversion -Wno-unused-local-typedef -Wthread-safety -O2 -DNDEBUG -fPIC -MD -MT muduo/base/CMakeFiles/muduo_base.dir/TimeZone.cc.o -MF muduo/base/CMakeFiles/muduo_base.dir/TimeZone.cc.o.d -o muduo/base/CMakeFiles/muduo_base.dir/TimeZone.cc.o -c ../muduo/base/TimeZone.cc
../muduo/base/TimeZone.cc:113:14: error: variable length arrays in C++ are a Clang extension [-Werror,-Wvla-cxx-extension]
  113 |     char buf[n];
      |              ^
../muduo/base/TimeZone.cc:113:14: note: function parameter 'n' with unknown value cannot be used in a constant expression
../muduo/base/TimeZone.cc:111:24: note: declared here
  111 |   string readBytes(int n)
      |                        ^
1 error generated.

Linux distro and version? x86 or ARM? 32-bit or 64-bit?

x86 64-bi6

Branch (cpp98/cpp11/cpp17) and version of muduo?

cpp20 muduo 2022.11.01

Version of cmake, gcc and boost? (If not from distro.)

clang 18.1.8

[QUANJUNSW]

Perhaps just use the std::vector<char>, then pass the pointer by member function data().