qt network module and openssl x509 error

//project.pro

QT -= gui
QT += core
QT += network
QT += concurrent

CONFIG += c++17 console
CONFIG -= app_bundle

win32:INCLUDEPATH += "C:/Program Files/OpenSSL/include"
win32:LIBS += "C:/Program Files/OpenSSL/lib/*.lib"

Additional projects:

https://github.com/yhirose/cpp-httplib

Operating System:windows 10 x64

openssl version: 1.1.1d, 1.1.1b, 1.1.0 k, 1.1.1 c

//Bug reproduction code
#ifndef CPPHTTPLIB_OPENSSL_SUPPORT
#define CPPHTTPLIB_OPENSSL_SUPPORT
#endif
#include <httplib.h>

//httplib.h Lead to qt bug

#ifdef CPPHTTPLIB_OPENSSL_SUPPORT
#include <openssl/err.h>
#include <openssl/ssl.h>
#include <openssl/x509v3.h>

My guess, qt internally used the openssl x509.h related code, which caused the problem

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2019/9/22 UTC+8 13:14

I found a reference to openssl x509 and proved my guess.

https://github.com/qt/qtbase/blob/5.12/src/network/ssl/qsslsocket_openssl_p.h#L94

https://github.com/qt/qtbase/blob/5.15/src/network/ssl/qsslsocket_openssl_p.h#L97

//openssl x509
#include <openssl/x509.h>
#include <openssl/x509v3.h>
#include <openssl/x509_vfy.h>

I think that disabling ssl and recompiling qt can solve the problem. But I haven't verified yet

---------------------------------------------------------------------------------------------------------------

2019/9/23 UTC+8 11:33

I think of a solution:
1, I recompile the qt module myself
2, I myself encapsulate the conflict function into lib or qt lib, through the binary assembly, resolve conflicts

In addition, I think the fact that most c++ ssl will use the openssl library, so I compile a lib myself is the best.

---------------------------------------------------------------------------------------------------------------

2019/9/23 UTC+8 18:12

I found the solution after testing, in the sub-project lib non-header files (*cpp), add openssl code, can be compiled normally. I will soon share the code to reproduce the bug in github, thank you very much.

---------------------------------------------------------------------------------------------------------------

2019/9/23 UTC+8 18:28

 https://github.com/HeMinzhang/opensslbug/blob/master/src/makeBug/main.cpp

Sorry, this bug is not a qt bug, I am very sorry.

//
#include <openssl/sha.h>
#include <openssl/aes.h>
#include <openssl/evp.h>

Because of the conflict between the above code and the httplib project

[ openssl isssue|https://github.com/openssl/openssl/issues/9981]