V20.8.0 throw some errors when install on centos, how to handle it?

[hytTony]

I did like these step:

1. git clone https://github.com/uNetworking/uWebSockets.git
2. cd uWebSockets
3. git clone https://github.com/uNetworking/uSockets.git
4. make

Then show these messages below (warning, error, note):

[root@VM-0-6-centos uWebSockets]# make
make -C uSockets;
for FILE in Broadcast HelloWorld ServerName EchoServer BroadcastingEchoServer UpgradeSync UpgradeAsync; do g++ -flto -O3 -lpthread -Wpedantic -Wall -Wextra -Wsign-conversion -Wconversion -std=c++2a -Isrc -IuSockets/src examples/$FILE.cpp -o $FILE uSockets/.o -lz & done;
for FILE in HelloWorldThreaded EchoServerThreaded; do g++ -pthread -flto -O3 -lpthread -Wpedantic -Wall -Wextra -Wsign-conversion -Wconversion -std=c++2a -Isrc -IuSockets/src examples/$FILE.cpp -o $FILE uSockets/.o -lz & done;
wait
make[1]: Entering directory '/root/tools/C++/uWebSockets/uSockets'
rm -f .o
cc -DLIBUS_NO_SSL -std=c11 -Isrc -flto -O3 -c src/.c src/eventing/.c src/crypto/.c
ar rvs uSockets.a .o
r - bsd.o
r - context.o
r - epoll_kqueue.o
r - gcd.o
r - libuv.o
r - loop.o
r - openssl.o
r - socket.o
r - wolfssl.o
ar: bsd.o: plugin needed to handle lto object
ar: context.o: plugin needed to handle lto object
ar: epoll_kqueue.o: plugin needed to handle lto object
ar: gcd.o: plugin needed to handle lto object
ar: libuv.o: plugin needed to handle lto object
ar: loop.o: plugin needed to handle lto object
ar: openssl.o: plugin needed to handle lto object
ar: socket.o: plugin needed to handle lto object
ar: wolfssl.o: plugin needed to handle lto object
make[1]: Leaving directory '/root/tools/C++/uWebSockets/uSockets'
In file included from src/HttpResponse.h:31,
from src/App.h:41,
from examples/EchoServer.cpp:2:
src/WebSocket.h: In member function ‘void uWS::WebSocket<, , >::end(int, std::string_view)’:
src/WebSocket.h:178:45: warning: conversion to ‘long unsigned int’ from ‘int’ may change the sign of the result [-Wsign-conversion]
char closePayload[MAX_CLOSE_PAYLOAD + 2];
~~~~~~~~~~~~~~~~~~^~~
In file included from src/HttpResponse.h:31,
from src/App.h:41,
from examples/Broadcast.cpp:2:
src/WebSocket.h: In member function ‘void uWS::WebSocket<, , >::end(int, std::string_view)’:
src/WebSocket.h:178:45: warning: conversion to ‘long unsigned int’ from ‘int’ may change the sign of the result [-Wsign-conversion]
char closePayload[MAX_CLOSE_PAYLOAD + 2];
~~~~~~~~~~~~~~~~~~^~~
In file included from src/HttpResponse.h:31,
from src/App.h:41,
from examples/HelloWorldThreaded.cpp:1:
src/WebSocket.h: In member function ‘void uWS::WebSocket<, , >::end(int, std::string_view)’:
src/WebSocket.h:178:45: warning: conversion to ‘long unsigned int’ from ‘int’ may change the sign of the result [-Wsign-conversion]
char closePayload[MAX_CLOSE_PAYLOAD + 2];
~~~~~~~~~~~~~~~~~~^~~
In file included from src/HttpResponse.h:31,
from src/App.h:41,
from examples/UpgradeSync.cpp:2:
src/WebSocket.h: In member function ‘void uWS::WebSocket<, , >::end(int, std::string_view)’:
src/WebSocket.h:178:45: warning: conversion to ‘long unsigned int’ from ‘int’ may change the sign of the result [-Wsign-conversion]
char closePayload[MAX_CLOSE_PAYLOAD + 2];
~~~~~~~~~~~~~~~~~~^~~
In file included from src/HttpResponse.h:31,
from src/App.h:41,
from examples/EchoServerThreaded.cpp:1:
src/WebSocket.h: In member function ‘void uWS::WebSocket<, , >::end(int, std::string_view)’:
src/WebSocket.h:178:45: warning: conversion to ‘long unsigned int’ from ‘int’ may change the sign of the result [-Wsign-conversion]
char closePayload[MAX_CLOSE_PAYLOAD + 2];
~~~~~~~~~~~~~~~~~~^~~
In file included from src/HttpResponse.h:31,
from src/App.h:41,
from examples/BroadcastingEchoServer.cpp:1:
src/WebSocket.h: In member function ‘void uWS::WebSocket<, , >::end(int, std::string_view)’:
src/WebSocket.h:178:45: warning: conversion to ‘long unsigned int’ from ‘int’ may change the sign of the result [-Wsign-conversion]
char closePayload[MAX_CLOSE_PAYLOAD + 2];
~~~~~~~~~~~~~~~~~~^~~
In file included from src/HttpResponse.h:31,
from src/App.h:41,
from examples/UpgradeAsync.cpp:2:
src/WebSocket.h: In member function ‘void uWS::WebSocket<, , >::end(int, std::string_view)’:
src/WebSocket.h:178:45: warning: conversion to ‘long unsigned int’ from ‘int’ may change the sign of the result [-Wsign-conversion]
char closePayload[MAX_CLOSE_PAYLOAD + 2];
~~~~~~~~~~~~~~~~~~^~~
In file included from src/HttpResponse.h:31,
from src/App.h:41,
from examples/HelloWorld.cpp:1:
src/WebSocket.h: In member function ‘void uWS::WebSocket<, , >::end(int, std::string_view)’:
src/WebSocket.h:178:45: warning: conversion to ‘long unsigned int’ from ‘int’ may change the sign of the result [-Wsign-conversion]
char closePayload[MAX_CLOSE_PAYLOAD + 2];
~~~~~~~~~~~~~~~~~~^~~
examples/EchoServer.cpp: In function ‘int main()’:
examples/EchoServer.cpp:50:6: error: no matching function for call to ‘uWS::TemplatedApp::ws<main()::PerSocketData>(const char [3], )’
}).listen(9001, [](auto listen_socket) {
^
In file included from examples/EchoServer.cpp:2:
src/App.h:220:20: note: candidate: ‘template uWS::TemplatedApp&& uWS::TemplatedApp::ws(std::__cxx11::string, uWS::TemplatedApp::WebSocketBehavior&&) [with UserData = UserData; bool SSL = true]’
TemplatedApp &&ws(std::string pattern, WebSocketBehavior &&behavior) {
^~
src/App.h:220:20: note: template argument deduction/substitution failed:
examples/EchoServer.cpp:50:6: note: cannot convert ‘{((uWS::CompressOptions)((short unsigned int)(146 | 3840))), ((100 * 1024) * 1024), 16, ((100 * 1024) * 1024), false, false, true, nullptr, main()::<lambda(auto:11)>{}, main()::<lambda(auto:12, std::string_view, uWS::OpCode)>{}, main()::<lambda(auto:13*)>{}, main()::<lambda(auto:14*, std::string_view)>{}, main()::<lambda(auto:15*, std::string_view)>{}, main()::<lambda(auto:16*, int, std::string_view)>{}}’ (type ‘’) to type ‘uWS::TemplatedApp::WebSocketBehavior<main()::PerSocketData>&&’
}).listen(9001, [](auto listen_socket) {
^
examples/Broadcast.cpp: In function ‘int main()’:
examples/Broadcast.cpp:54:6: error: no matching function for call to ‘uWS::TemplatedApp::ws<main()::PerSocketData>(const char [3], )’
}).listen(9001, [](auto listen_socket) {
^
In file included from examples/Broadcast.cpp:2:
src/App.h:220:20: note: candidate: ‘template uWS::TemplatedApp&& uWS::TemplatedApp::ws(std::__cxx11::string, uWS::TemplatedApp::WebSocketBehavior&&) [with UserData = UserData; bool SSL = true]’
TemplatedApp &&ws(std::string pattern, WebSocketBehavior &&behavior) {
^~
src/App.h:220:20: note: template argument deduction/substitution failed:
examples/Broadcast.cpp:54:6: note: cannot convert ‘{SHARED_COMPRESSOR, ((16 * 1024) * 1024), 16, ((1 * 1024) * 1024), false, false, true, nullptr, main()::<lambda(auto:11)>{}, main()::<lambda(auto:12, std::string_view, uWS::OpCode)>{}, main()::<lambda(auto:13*)>{}, main()::<lambda(auto:14*, std::string_view)>{}, main()::<lambda(auto:15*, std::string_view)>{}, main()::<lambda(auto:16*, int, std::string_view)>{}}’ (type ‘’) to type ‘uWS::TemplatedApp::WebSocketBehavior<main()::PerSocketData>&&’
}).listen(9001, [](auto listen_socket) {
^
examples/UpgradeSync.cpp: In function ‘int main()’:
examples/UpgradeSync.cpp:72:6: error: no matching function for call to ‘uWS::TemplatedApp::ws<main()::PerSocketData>(const char [3], )’
}).listen(9001, [](auto listen_socket) {
^
In file included from examples/UpgradeSync.cpp:2:
src/App.h:220:20: note: candidate: ‘template uWS::TemplatedApp&& uWS::TemplatedApp::ws(std::__cxx11::string, uWS::TemplatedApp::WebSocketBehavior&&) [with UserData = UserData; bool SSL = true]’
TemplatedApp &&ws(std::string pattern, WebSocketBehavior &&behavior) {
^~
src/App.h:220:20: note: template argument deduction/substitution failed:
examples/UpgradeSync.cpp:72:6: note: cannot convert ‘{SHARED_COMPRESSOR, (16 * 1024), 10, ((1 * 1024) * 1024), main()::<lambda(auto:11, auto:12, auto:13*)>{}, main()::<lambda(auto:14*)>{}, main()::<lambda(auto:15*, std::string_view, uWS::OpCode)>{}, main()::<lambda(auto:16*)>{}, main()::<lambda(auto:17*, std::string_view)>{}, main()::<lambda(auto:18*, std::string_view)>{}, main()::<lambda(auto:19*, int, std::string_view)>{}}’ (type ‘’) to type ‘uWS::TemplatedApp::WebSocketBehavior<main()::PerSocketData>&&’
}).listen(9001, [](auto listen_socket) {
^
examples/EchoServerThreaded.cpp: In lambda function:
examples/EchoServerThreaded.cpp:44:14: error: no matching function for call to ‘uWS::TemplatedApp::ws<main()::PerSocketData>(const char [3], )’
}).listen(9001, [](auto listen_socket) {
^
In file included from examples/EchoServerThreaded.cpp:1:
src/App.h:220:20: note: candidate: ‘template uWS::TemplatedApp&& uWS::TemplatedApp::ws(std::__cxx11::string, uWS::TemplatedApp::WebSocketBehavior&&) [with UserData = UserData; bool SSL = false]’
TemplatedApp &&ws(std::string pattern, WebSocketBehavior &&behavior) {
^~
src/App.h:220:20: note: template argument deduction/substitution failed:
examples/EchoServerThreaded.cpp:44:14: note: cannot convert ‘{SHARED_COMPRESSOR, (16 * 1024), 10, ((1 * 1024) * 1024), nullptr, main()::<lambda(std::thread)>::<lambda()>::<lambda(auto:11)>{}, main()::<lambda(std::thread*)>::<lambda()>::<lambda(auto:12*, std::string_view, uWS::OpCode)>{}, main()::<lambda(std::thread*)>::<lambda()>::<lambda(auto:13*)>{}, main()::<lambda(std::thread*)>::<lambda()>::<lambda(auto:14*, std::string_view)>{}, main()::<lambda(std::thread*)>::<lambda()>::<lambda(auto:15*, std::string_view)>{}, main()::<lambda(std::thread*)>::<lambda()>::<lambda(auto:16*, int, std::string_view)>{}}’ (type ‘’) to type ‘uWS::TemplatedApp::WebSocketBehavior<main()::PerSocketData>&&’
}).listen(9001, [](auto listen_socket) {
^
examples/BroadcastingEchoServer.cpp: In function ‘int main()’:
examples/BroadcastingEchoServer.cpp:64:6: error: no matching function for call to ‘uWS::TemplatedApp::ws<main()::PerSocketData>(const char [3], )’
}).listen(9001, [](auto listen_s) {
^
In file included from examples/BroadcastingEchoServer.cpp:1:
src/App.h:220:20: note: candidate: ‘template uWS::TemplatedApp&& uWS::TemplatedApp::ws(std::__cxx11::string, uWS::TemplatedApp::WebSocketBehavior&&) [with UserData = UserData; bool SSL = true]’
TemplatedApp &&ws(std::string pattern, WebSocketBehavior &&behavior) {
^~
src/App.h:220:20: note: template argument deduction/substitution failed:
examples/BroadcastingEchoServer.cpp:64:6: note: cannot convert ‘{DISABLED, ((16 * 1024) * 1024), 60, ((16 * 1024) * 1024), false, true, false, nullptr, main()::<lambda(auto:11)>{}, main()::<lambda(auto:12, std::string_view, uWS::OpCode)>{app}, main()::<lambda(auto:13*)>{}, main()::<lambda(auto:14*, std::string_view)>{}, main()::<lambda(auto:15*, std::string_view)>{}, main()::<lambda(auto:16*, int, std::string_view)>{}}’ (type ‘’) to type ‘uWS::TemplatedApp::WebSocketBehavior<main()::PerSocketData>&&’
}).listen(9001, [](auto listen_s) {
^
In file included from src/HttpResponse.h:31,
from src/App.h:41,
from examples/ServerName.cpp:1:
src/WebSocket.h: In member function ‘void uWS::WebSocket<, , >::end(int, std::string_view)’:
src/WebSocket.h:178:45: warning: conversion to ‘long unsigned int’ from ‘int’ may change the sign of the result [-Wsign-conversion]
char closePayload[MAX_CLOSE_PAYLOAD + 2];
~~~~~~~~~~~~~~~~~~^~~
examples/UpgradeAsync.cpp: In function ‘int main()’:
examples/UpgradeAsync.cpp:119:6: error: no matching function for call to ‘uWS::TemplatedApp::ws<main()::PerSocketData>(const char [3], )’
}).listen(9001, [](auto listen_socket) {
^
In file included from examples/UpgradeAsync.cpp:2:
src/App.h:220:20: note: candidate: ‘template uWS::TemplatedApp&& uWS::TemplatedApp::ws(std::__cxx11::string, uWS::TemplatedApp::WebSocketBehavior&&) [with UserData = UserData; bool SSL = true]’
TemplatedApp &&ws(std::string pattern, WebSocketBehavior &&behavior) {
^~
src/App.h:220:20: note: template argument deduction/substitution failed:
examples/UpgradeAsync.cpp:119:6: note: cannot convert ‘{SHARED_COMPRESSOR, (16 * 1024), 10, ((1 * 1024) * 1024), main()::<lambda(auto:11, auto:12, auto:13*)>{}, main()::<lambda(auto:14*)>{}, main()::<lambda(auto:15*, std::string_view, uWS::OpCode)>{}, main()::<lambda(auto:16*)>{}, main()::<lambda(auto:17*, std::string_view)>{}, main()::<lambda(auto:18*, std::string_view)>{}, main()::<lambda(auto:19*, int, std::string_view)>{}}’ (type ‘’) to type ‘uWS::TemplatedApp::WebSocketBehavior<main()::PerSocketData>&&’
}).listen(9001, [](auto *listen_socket) {

[hytTony]

solved by modify the examples's code, add some parameters to match the "WebSocketBehavior" struct；and websocket.h "static const int MAX_CLOSE_PAYLOAD = 123" -> "static const long unsigned int MAX_CLOSE_PAYLOAD = 123"