Why Qt creator say "use of undeclared identifier 'QSslSocket'", but it exists.

[jsulm]

@senmx OK, then this comes from code model (clang) - it often reports false positive for what ever reason. If you do not want to use it disable the plug-in ClangCodeModel in Help/About Plugins...

[senmx]

@jsulm Thanks. I found that using the old version is normal, I don't know why. My new version of qt is compiled by myself after downloading the opensource code, and there is this header file under it.

[Pablo J. Rogina]

@senmx as a side note, if that's the whole code of your "main.cpp", the #include <QSslSockect> statement seems superfluous given there are no references to such class later in the code.

[senmx]

@Pablo-J-Rogina Thanks.This is all the code, the old version is normal. I just write a test code casually, and raise this question by the way.

[SGaist]

Hi,

Since you build Qt yourself, did you activate the OpenSSL option ?

[senmx]

@SGaist What option activate and how?
This is my compile shell:

#!/bin/bash
#https://doc.qt.io/qt-5/android-building.html

cd /home/sen/soft/qt-everywhere-src-5.15.1

./configure -xplatform android-clang -prefix /usr/local/Qt-5.15.1-android --disable-rpath -nomake tests -nomake examples -android-ndk $ANDROID_NDK_HOME -android-sdk $ANDROID_SDK_HOME -no-warnings-are-errors
make -j12
make install

[SGaist]

You have the complete list of option if you call configure --help.

You should also check the configure summary to see what options/features are enabled.

And finally, if you want to build for Android with OpenSSL, you need an Android build of OpenSSL.

[senmx]

./configure --help
...
-no-openssl .......... Do not use OpenSSL [default on Apple and WinRT]
-openssl-linked ...... Use OpenSSL and link to libssl [no]
-openssl-runtime ..... Use OpenSSL and dynamically load libssl [auto]

I have now turned on this option and recompile

  1 #!/bin/bash
  2 #https://doc.qt.io/qt-5/android-building.html
  3 #https://doc.qt.io/qt-5/ssl.html
  4 
  5 cd /home/sen/soft/qt-everywhere-src-5.15.1
  6 make clean
  7 OPENSSL_LIBS='-L/home/sen/github/c/openssl-1.1.1g -lssl -lcrypto' ./configure -xplatform android-clang -prefix /usr/local/Qt-5.15.1-android --disable-rpath -nomake tests -nomake examples -android-ndk $ANDROID_NDK_HOME -android-sdk $AND    ROID_SDK_HOME -no-warnings-are-errors -openssl-linked
  8 make -j12
  9 make install

on configure:

ERROR: Feature 'openssl-linked' was enabled, but the pre-condition '!features.securetransport && !features.schannel && libs.openssl' failed.

[jsulm]

@senmx Is /home/sen/github/c/openssl-1.1.1g the Android build?
Check the config.log file to see why exactly it failed.

[senmx]

@jsulm config.log:
https://drive.google.com/file/d/1lvrOXPgVWjvnfGV5U7TaMqPEJYh0leLF/view?usp=sharing

[jsulm]

@senmx You did not answer my question.

Did you check the config.log by yourself first?
Because if you check it you see

> main.cpp:2:10: fatal error: 'openssl/ssl.h' file not found
> #include <openssl/ssl.h>

So, it could not find SSL header.

[senmx]

@jsulm
I saw it, but I didn’t understand it. The first thing I saw from top to bottom was:

> main.cpp:7:8: error: Intel CET not available
> # error Intel CET not available
> ^
> 1 error generated.
> make: *** [Makefile:191：main.o] 错误 1
test config.qtbase.tests.intelcet FAILED

Anyway, something is missing, I don’t know what is missing.

Could not find openssl/ssl.h,but:

[sen@x openssl]$ find /usr/include/openssl/ -type f -name "ssl.h"
/usr/include/openssl/ssl.h

I have compiled link library files in this directory:

/home/sen/github/c/openssl-1.1.1g

libssl_1_1.so
libcrypto_1_1.so

[SGaist]

How did you build OpenSSL for Android ?

[senmx]

@SGaist
according to Qt doc:

#!/bin/sh

export HOST=linux-x86_64
export PATH="$ANDROID_NDK_HOME/toolchains/llvm/prebuilt/$HOST/bin":$PATH

cd /home/sen/github/c/openssl-1.1.1g
./Configure shared android-arm -D__ANDROID_API__=21
make -j12 SHLIB_VERSION_NUMBER= SHLIB_EXT=_1_1.so build_libs

[SGaist]

Then why are you mixing your system installation with your custom OpenSSL build.

By the way, your Intel CET is likely due to a line that starts with a #. My guess is that this is a comme but Python style rather than C/C++ style.

[senmx]

@SGaist The config.log above is the log of build qt-opensource, not openssl.Myself OpenSSL build is arm binding.

[SGaist]

Can you provide the complete OpenSSL checks part ?

[senmx]

@SGaist Do you mean "make check"? In order to check whether the two files libssl_1_1_1.so and libcrypto_1_1_1.so can be used? These two files can be correctly linked to the android project and using , should be no problem.

[jsulm]

@senmx said in Why Qt creator say "use of undeclared identifier 'QSslSocket'", but it exists.:

Do you mean "make check"?

No, the SSL check in config.log which is:

loaded result for library config.qtbase_network.libraries.openssl
Trying source 0 (type openssl) of library openssl ...
+ cd /home/sen/soft/qt-everywhere-src-5.15.1/config.tests/openssl && /home/sen/soft/qt-everywhere-src-5.15.1/qtbase/bin/qmake "CONFIG -= qt debug_and_release app_bundle lib_bundle" "CONFIG += shared warn_off console single_arch" -early "CONFIG += cross_compile" 'QMAKE_USE += openssl' 'QMAKE_LIBS_OPENSSL = -L/home/sen/github/c/openssl-1.1.1g -lssl -lcrypto' /home/sen/soft/qt-everywhere-src-5.15.1/config.tests/openssl
+ cd /home/sen/soft/qt-everywhere-src-5.15.1/config.tests/openssl && MAKEFLAGS= /usr/bin/make
> /opt/android-sdk/ndk/21.1.6352462/toolchains/llvm/prebuilt/linux-x86_64/bin/clang++ -c -target aarch64-linux-android21 -fno-limit-debug-info -fPIC -fstack-protector-strong -DANDROID -O2 -fPIC  -I. -I/home/sen/soft/qt-everywhere-src-5.15.1/qtbase/mkspecs/android-clang -o main.o main.cpp
> main.cpp:2:10: fatal error: 'openssl/ssl.h' file not found
> #include <openssl/ssl.h>
>          ^~~~~~~~~~~~~~~
> 1 error generated.

@SGaist

[SGaist]

From the looks of it, you did not provide the correct path to the where the includes are located.