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cmd/cgo: build typedef fail in clang but ok in gcc #20129

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fastfading opened this issue Apr 26, 2017 · 3 comments

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@fastfading
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commented Apr 26, 2017

Please answer these questions before submitting your issue. Thanks!

What version of Go are you using (go version)?

go 1.8

What operating system and processor architecture are you using (go env)?

mac os 10 & ubuntu 16.04

What did you do?

package main

/*
#include <stdlib.h>
#include <stdio.h>
typedef void GLvoid;
GLvoid Foo() {
   printf("foo");
}
*/
import "C"

func main() {
   C.Foo()
}

CC=clang CGO_ENABLE=1 go build -v void.go -->fail
command-line-arguments

command-line-arguments

./void.go:47:10: error: field has incomplete type 'GLvoid' (aka 'void')

CC=gcc CGO_ENABLE=1 go build -o void -v void.go -->ok
command-line-arguments

What did you expect to see?

all build ok in both gcc and clang

What did you see instead?

clang build fail but gcc ok

@fastfading

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commented Apr 26, 2017

gcc --version
gcc (Ubuntu 6.2.0-5ubuntu12) 6.2.0 20161005
but build fail on mac
gcc --version

Configured with: --prefix=/Applications/Xcode.app/Contents/Developer/usr --with-gxx-include-dir=/usr/include/c++/4.2.1

Apple LLVM version 8.0.0 (clang-800.0.42.1)

Target: x86_64-apple-darwin15.5.0

Thread model: posix

@ALTree ALTree changed the title cgo build typedef fail in clang but ok in gcc cmd/cgo: build typedef fail in clang but ok in gcc Apr 26, 2017
@ianlancetaylor

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commented Apr 27, 2017

For some reason clang seems to be emitting DW_TAG_typedef without actually saying what it is a typedef for.

<1><6a>: Abbrev Number: 6 (DW_TAG_typedef)
    <6b>   DW_AT_name        : (indirect string, offset: 0x8c): GLvoid
    <6f>   DW_AT_decl_file   : 1
    <70>   DW_AT_decl_line   : 2

Perhaps it does that for any typedef of void?

@ianlancetaylor ianlancetaylor added this to the Go1.9 milestone Apr 27, 2017
@gopherbot

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commented Jun 4, 2017

CL https://golang.org/cl/44772 mentions this issue.

@gopherbot gopherbot closed this in 289a871 Jun 27, 2017
@golang golang locked and limited conversation to collaborators Jun 27, 2018
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