cgo不包含CXXFLAGS

Question

I want to call C code in Golang:

// #cgo CFLAGS: -I/usr/include/c++/8.1.1/bits
// #cgo CXXFLAGS: -std=gnu++11
// #include "c++0x_warning.h"
import "C"

but get error:

In file included from ./main.go:5:
/usr/include/c++/8.1.1/bits/c++0x_warning.h:32:2: error: #error This file requires compiler and library support for the ISO C++ 2011 standard. This support must be enabled with the -std=c++11 or -std=gnu++11 compiler options.

So cgo doesn't use CXXFLAGS. I tried -std=c++11 and it doesn't work too. What I do wrong?

$ go version
go version go1.10.3 linux/amd64

Answer 1

Please refer to the following SO question: Difference between CPPFLAGS and CXXFLAGS in GNU Make to figure out which flags you really need in the context of your program.

If you are calling pure C code (and not C++ code), I don't think you will need CXX_FLAGS:

CPPFLAGS are supposed to be flags for the C PreProcessor; CXXFLAGS are flags for the C++ compiler.

You might also want to check your go env. If you really need this flag, you can try to compile your program using env CGO_CXXFLAGS="-std=c++11" go build <YOUR_CODE>.