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error Qt requires C++11 support
I am becoming rather frustrated with this problem. There seems to be a history of it, I've tried pretty much all of the recommended solutions, but it persists. I cannot create any new projects, nor compile the Qt Src, examples, etc.
I am running RHEL 7.7 Server, which includes GCC 4.8, which provides c++11 support. I am trying to use Qt 5.14.2. I've run configure as described in the Src/README. Output of configure says I have c++11 support. I added "CONFIG += c++11" to qt.pro in Src. My make output shows "-std=gnu++11". So, I am asking why this problem is happening?
Take a look at https://gcc.gnu.org/projects/cxx-status.html
"GCC 4.8.1 was the first feature-complete implementation of the 2011 C++ standard"
So, not sure GCC 4.8 is really enough.
"nor compile the Qt Src" - what errors do you get? Are they actually related to C++11 support?
@jsulm Thanks for the reply. I am currently trying to go above GCC 5.0 to see if that will fix it. Kind of seems like it has to be something like that. Here is a sample of the compiler error
In file included from ../../include/QtCore/qbasicatomic.h:1:0
#error "Qt requires C++11 support"
#error "Qt requires C++11 support"
Update to this post, I am actually using GCC 4.8.5, which should contain all the c++11 features. Again, this problem is rather bizarre.
JonB last edited by JonB
For the record, from your
qbasicatomic.h:61:4error message you are falling foul in this code:
// If C++11 atomics are supported, use them! // Note that constexpr support is sometimes disabled in QNX builds but its // library has <atomic>. #elif defined(Q_COMPILER_ATOMICS) && (defined(Q_COMPILER_CONSTEXPR) || defined(Q_OS_QNX)) # include <QtCore/qatomic_cxx11.h> ... // No fallback #else # error "Qt requires C++11 support" #endif
so it appears to be your lack of
constexprsupport. Not that I know there's anything you can do about it....
It's RHEL 8.x which supports
However, isn't the following saying you can get that for your RHEL 7 (even if it isn't pre-shipped)?
We are pleased to announce general availability of Red Hat Developer Toolset 8 for Red Hat Enterprise Linux 6 and 7. The key new components for this release are:
Like other tools, these are easily installable via
@JonB Oh my gosh, thank you so much! Yea, it always fails on the atomics compile, regardless of what I do. I wonder if I could maybe fall back to a little earlier version of Qt that doesn't rely on this.
SimonSchroeder last edited by
GCC 4.8.5 was released in 2015, but GCC 5.1 was also already released at that time. The first version of GCC 4.8 even dates back to 2013. I am not sure if it makes sense to back that far for a proper Qt version.
On RedHat you should have a look at
devtoolsin order to install newer versions of GCC. These will provide whole programming environments (including proper libraries, etc.) tailored to the selected version.
JonB last edited by
On RedHat you should have a look at devtools in order to install newer versions of GCC. These will provide whole programming environments (including proper libraries, etc.) tailored to the selected version.
I already provided the OP with the link for gcc 8 under RHEL 6/7.
Hi, I just wanted to say thanks for your replies. I have resolved my issue with this by going back to version 5.12.8. This version gives me everything I need, and also fixes another bug issue we were having with the 5.9.7 distribution. We are up and running, forms compiling now, etc.