Search code examples
c++gcccmakeqt-creatorfedora

QtCreator with CMake, Incorrectly parsed __cplusplus value in editor

I have a CMake project being used within QtCreator with C++17 enabled.

I can compile and use C++17 features without issues. When printing the value of __cplusplus I get 201703, but when I hover over the macro in the QtCreator editor it shows a value of 1.

Because of this, I do not get any code completion or highlighting for any C++11 (and later) features. This makes it annoying to deal with.

Standard headers such as <memory> have a bunch of checks like:

#if __cplusplus >= 201103L
// unique_ptr and shared_ptr

The editor disables all code under the condition due to the incorrect __cplusplus value.

Environment:

  • Fedora 29
  • CMake 3.12
  • GCC 8.3.1
  • QtCreator 4.7.2 (Qt 5.11.3)

Is this a known issue with QtCreator and CMake projects? Are there work arounds to get the QtCreator editor to parse the code with the correct __cplusplus value provided by CMake/GCC?

Solution

  • It seems that QtCreator 4.7.2 has a bug regarding __cplusplus being defined as 1. Upgrading to 4.9.0 now correctly defines __cplusplus as 201703 (for C++17 Cmake project).