QString causing Memory Error
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Hi and welcome to devnet,
On which OS are you getting this issue ?
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@SGaist Hey,
thanks for your quick reply. We are using Windows 10 and Windows 11, both 64 bit.
You are mixing debug and release dlls.
How do you build / link your app? Please use cmake or qmake./edit: What should this line do/ why is it needed:
set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} ${Qt6Widgets_EXECUTABLE_COMPILE_FLAGS}")
The include and add_definitions call is also not needed since you link against the imported QtWidgets target.
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You are mixing debug and release dlls.
How do you build / link your app? Please use cmake or qmake./edit: What should this line do/ why is it needed:
set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} ${Qt6Widgets_EXECUTABLE_COMPILE_FLAGS}")
The include and add_definitions call is also not needed since you link against the imported QtWidgets target.
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@Christian-Ehrlicher For my education, how do you determine this? Bitter experience? Is there something in the original information that I am missing?
@ChrisW67 said in QString causing Memory Error:
Bitter experience? Is there something in the original information that I am missing?
This looks like something this way - the memory is allocated in main.cpp - therefore the e.g. msvc debug allocator is used but deleted within the Qt dll so the release (de)allocator is used which causes such problems. Yes I've seen such problems more than once when mixing debug and release libs.
The op should take a look with e.g. dependency walker or 'dependencies gui' (better) to not mix debug and release libs.
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@ChrisW67 said in QString causing Memory Error:
Bitter experience? Is there something in the original information that I am missing?
This looks like something this way - the memory is allocated in main.cpp - therefore the e.g. msvc debug allocator is used but deleted within the Qt dll so the release (de)allocator is used which causes such problems. Yes I've seen such problems more than once when mixing debug and release libs.
The op should take a look with e.g. dependency walker or 'dependencies gui' (better) to not mix debug and release libs.
How do i check the debug/release versions? I downloaded the dependencies gui and opened my executable in it.
It gave me an output like this:
We are only using the QTBase Repository and compiled it ourselfs, if that information helps.
My mate actually got the code to work by installing qt via the installer, but i wanted to look further into this to see if we are able to fix it. -
How do i check the debug/release versions? I downloaded the dependencies gui and opened my executable in it.
It gave me an output like this:
We are only using the QTBase Repository and compiled it ourselfs, if that information helps.
My mate actually got the code to work by installing qt via the installer, but i wanted to look further into this to see if we are able to fix it.@Pawx Since you're using MinGW which you did not told us, my assumption can not be correct.
What I see is that you're using another MinGW version than the one provided by Qt - make sure to use the MinGW compiler and libs (libstdc++6.dll/libgcc_s_seh-1.dll) provided by Qt. -
@Pawx Since you're using MinGW which you did not told us, my assumption can not be correct.
What I see is that you're using another MinGW version than the one provided by Qt - make sure to use the MinGW compiler and libs (libstdc++6.dll/libgcc_s_seh-1.dll) provided by Qt. -
How do i make sure to use the correct MinGW version? Is this something i can configure in my CMakeList or where can i adjust this?
@Pawx said in QString causing Memory Error:
How do i make sure to use the correct MinGW version?
Use the correct kit settings and set the PATH correct.
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@Pawx said in QString causing Memory Error:
How do i make sure to use the correct MinGW version?
Use the correct kit settings and set the PATH correct.
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Is there a way to configure the kits without qt creator? Currently i dont have QTCreator installed and just compiled the repository and built it. Is QTCreator mandatory/recommended to use?
@Pawx said in QString causing Memory Error:
QTCreator installed and just compiled the repository and built it
So you compiled Qt by yourself?
What MinGW version do you use? -
@Pawx said in QString causing Memory Error:
QTCreator installed and just compiled the repository and built it
So you compiled Qt by yourself?
What MinGW version do you use?Yes, i compiled it myself.
I got my mingw from winlabs, and its version file says:winlibs personal build version gcc-13.2.0-llvm-17.0.6-mingw-w64ucrt-11.0.1-r5 This is the winlibs Intel/AMD 64-bit standalone build of: - GCC 13.2.0 - GDB 14.1 - LLVM/Clang/LLD/LLDB 17.0.6 - MinGW-w64 11.0.1 (linked with ucrt) - GNU Binutils 2.42 - GNU Make 4.4.1 - PExports 0.47 - dos2unix 7.5.2 - Yasm 1.3.0 - NASM 2.16.01 - JWasm 2.12pre - ccache version 4.9 - CMake 3.28.2 - ninja 1.11.1.git.kitware.jobserver-1 - Doxygen 1.10.0 Thread model: posix Runtime library: UCRT (Windows 10 or higher, or when [Update for Universal C Runtime](https://support.microsoft.com/en-us/topic/update-for-universal-c-runtime-in-windows-c0514201-7fe6-95a3-b0a5-287930f3560c) is installed on older Windows versions, not supported on systems older than Windows 7 SP1 and Windows Server 2008 R2 SP1) This build was compiled with GCC 13.2.0 and packaged on 2024-02-03. Please check out http://winlibs.com/ for the latest personal build. -
Yes, i compiled it myself.
I got my mingw from winlabs, and its version file says:winlibs personal build version gcc-13.2.0-llvm-17.0.6-mingw-w64ucrt-11.0.1-r5 This is the winlibs Intel/AMD 64-bit standalone build of: - GCC 13.2.0 - GDB 14.1 - LLVM/Clang/LLD/LLDB 17.0.6 - MinGW-w64 11.0.1 (linked with ucrt) - GNU Binutils 2.42 - GNU Make 4.4.1 - PExports 0.47 - dos2unix 7.5.2 - Yasm 1.3.0 - NASM 2.16.01 - JWasm 2.12pre - ccache version 4.9 - CMake 3.28.2 - ninja 1.11.1.git.kitware.jobserver-1 - Doxygen 1.10.0 Thread model: posix Runtime library: UCRT (Windows 10 or higher, or when [Update for Universal C Runtime](https://support.microsoft.com/en-us/topic/update-for-universal-c-runtime-in-windows-c0514201-7fe6-95a3-b0a5-287930f3560c) is installed on older Windows versions, not supported on systems older than Windows 7 SP1 and Windows Server 2008 R2 SP1) This build was compiled with GCC 13.2.0 and packaged on 2024-02-03. Please check out http://winlibs.com/ for the latest personal build.I would try with the pre-compiled Qt libs + MinGW from Qt first.
