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I am doing some protocol stack programming with golang. I put codec thing in C. And build C with a simple CMake configuration as below:

cmake_minimum_required (VERSION 2.8) project (Demo1) aux_source_directory(. DIR_SRCS) add_library(codecLib SHARED ${DIR_SRCS})

and Link the shared library with this kind code

//#cgo CFLAGS:-I./codec/ //#cgo LDFLAGS: ./codec/build -lcodecLib //#include <protocol.h> import "C" import "fmt"

at last, I met following error while building it with command "CGO_ENABLED=1 GOOS=linux GOARCH=amd64 go build",

In file included from /usr/include/stdlib.h:42:0, from _cgo_export.c:2: /usr/include/x86_64-linux-gnu/bits/waitstatus.h:79:15: error: duplicate member ‘__w_retcode’ unsigned int __w_retcode:8; ^ /usr/include/x86_64-linux-gnu/bits/waitstatus.h:80:15: error: duplicate member ‘__w_coredump’ unsigned int __w_coredump:1; ^ /usr/include/x86_64-linux-gnu/bits/waitstatus.h:81:15: error: duplicate member ‘__w_termsig’ unsigned int __w_termsig:7; ^ /usr/include/x86_64-linux-gnu/bits/waitstatus.h:93:15: error: duplicate member ‘__w_stopsig’ unsigned int __w_stopsig:8; /* Stopping signal. */ ^ /usr/include/x86_64-linux-gnu/bits/waitstatus.h:94:15: error: duplicate member ‘__w_stopval’ unsigned int __w_stopval:8; /* W_STOPPED if stopped. */

I didn't find the solution yet. I appreciate for the solution.

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The problem you're having is probably due to GOLang not parsing the pre-processor commands in the GNU C Library properly (or at all). It could also be due to an issue with your importing endian.h, or requiring some other C/GO/CGO import or define.

Here's an excerpt from waitstatus.h (or see the full file on GitHub):

# if __BYTE_ORDER == __LITTLE_ENDIAN unsigned int __w_termsig:7; unsigned int __w_coredump:1; unsigned int __w_retcode:8; unsigned int:16; # endif /* Little endian. */ # if __BYTE_ORDER == __BIG_ENDIAN unsigned int:16; unsigned int __w_retcode:8; unsigned int __w_coredump:1; unsigned int __w_termsig:7; # endif /* Big endian. */

You'll notice that the same variables are announced twice - one for each Endian. GOLang is erroring because of this. You could resolve this by manually editing the file if you know which endian you're compiling for.

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3 Comments

I met same problem. I didn't use stdlib at all. The error is still there. And the preprocess is right. It compare the __BYTE_ORDER to ENDIAN. one variable isn't possible has 2 different value on same time
Thank you ,it helps I found I have a endian.h header file in my project that cause this error.
Glad to hear it @RaphaelYu. Go ahead and accept the answer if it helped :)

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