Configure C++ standard in gradle c++ project? - c++

Question

I have a gradle project defined by the following build script (build.gradle):
plugins {
id 'cpp-application'
}
application {
targetMachines.add(machines.linux.x86_64)
targetMachines.add(machines.windows.x86_64)
}
This is my directory structure:
./src
./src/main
./src/main/cpp
./src/main/cpp/descriptor.cpp
./src/main/cpp/reader_writer.cpp
./src/main/cpp/constant_pool.cpp
./src/main/cpp/unjar.cpp
./src/main/cpp/attribute.cpp
./src/main/cpp/main.cpp
./src/main/cpp/java_serde.cpp
./src/main/headers
./src/main/headers/unjar.h
./src/main/headers/attribute.h
./src/main/headers/constant_pool.h
./src/main/headers/descriptor.h
./src/main/headers/java_serde.h
./src/main/headers/reader_writer.h
./build.gradle
Now I want to compile my project, where I am using C++17 features in some source files. I am oblivious as to how I can set the C++ standard version for my gradle build.
How do I tell gradle to compile my code with C++17?

Answer 1

Set the following inside your application configuration clause:
compilerArgs.add '-std=c++17'
If you are targeting multiple platforms, you can set compilerArgs conditionally:
compilerArgs.addAll toolChain.map { toolChain ->
if (toolChain in [ Gcc, Clang ]) {
return ['-std=++17']
} else if (toolChain in VisualCpp) {
return '/std=c++17'
}
return []
}

Answer 2

In your gradle script where you kick off cmake, add cppFlags:
cmake {
cppFlags = "std=c++17"
}

Answer 3

I hope it helps you:
cmake {
cppFlags = "std=c++17"}
} <- at 3rd line