set CMAKE_CXX_STANDARD for CLion syntax help

[simap]

Without this set, CLion complains about many c++ features like std::unordered_map, lambdas, auto, etc.

[ivankravets]

Could you provide a project example how to reproduce that? I tried different combination and don't see any complaints.

Thanks!

[ivankravets]

Try to add to platformio.ini

[env:myenv]
build_flags = -std=c++11

Then, REBUILD_PROJECT_INDEX (target)

[simap]

Sure, this is a minimal program that can reproduce the issue in CLion (version 2016.3)

#include <Arduino.h>
#include <unordered_map>
#include <string>

std::unordered_map <std::string , double> varMap;

void setup() {
    varMap["test"] = 1.0;
}

void loop() {
}

Without set(CMAKE_CXX_STANDARD 11) I get this:

With it, I get no errors:

It compiles fine either way, but the IDE is unaware of the right C++ version.

Even without

[env:myenv]
build_flags = -std=c++11

The CMakeListsPrivate.txt file already contains that build flag:

SET(CMAKE_CXX_FLAGS_DISTRIBUTION "-fno-rtti -fno-exceptions -std=c++11 -Os -mlongcalls -mtext-section-literals -falign-functions=4 -ffunction-sections -fdata-sections -DARDUINO=20300 -DLWIP_OPEN_SRC -DF_CPU=80000000L -D__ets__ -DICACHE_FLASH -DPLATFORMIO=30201 -DESP8266 -DARDUINO_ARCH_ESP8266 -DARDUINO_ESP8266_ESP12 -U__STRICT_ANSI__")

Adding it and regenerating with platformio init --ide clion doesn't seem to fix the IDE issues.

I think what is going on is that CLion is parsing everything itself and doesn't "see" the build flags, but instead relies on the set(CMAKE_CXX_STANDARD 11) line for its own internal parser.

[simap]

Another hint, if I go in to the unordered_map include, the IDE grays out the wrong section of #if __cplusplus < 201103L when set(CMAKE_CXX_STANDARD 11) isn't set.

[simap]

Thanks!

[ivankravets]

Thank you also! 👍