Hi Sebastien,
Thanks for the response but this does not work completely. The issue is
demonstrated in a package here:
github.com/satyamsi/cbuilds/a
One file a.go build for linux and has an import "C" - this works fine.
On non-linux, a_non_linux.go gets used. As this file doesnt use anything C
related, I dont have an "import "C"". In addition the c file has what you
suggested. However, the error says I have to use
"cgo". I used the workaround to add an import "C" and that seems to do the
trick to avoid this error.
The problem is that the error is thrown just by checking that one is not
using cgo but directory has c files. I think it should do a little more
than that.
Satyam
On Friday, July 29, 2016 at 12:41:18 AM UTC-7, Sebastien Binet wrote:
>
> Satyam,
>
> On Fri, Jul 29, 2016 at 3:25 AM, <sat...@aporeto.com <javascript:>> wrote:
>
>> Hi Folks,
>>
>> If I need to compile c files in a package conditionally based on the OS
>> that I am running on, seems like +build is the right way to do it. I can
>> have two versions of the file:
>>
>> somefile_linux.go which has // +build linux and also an import "C"
>>
>> and
>>
>> somefile_nonlinux.go which has // +build !linux and no importing of "C"
>>
>> In addition, I have file
>>
>> some_cfile.c
>>
>> However, I hit an issue that there is a hard check in the pkg.go which is
>> throwing an error:
>>
>>
>> // The gc toolchain only permits C source files with cgo.
>> if len(p.CFiles) > 0 && !p.usesCgo() && !p.usesSwig() &&
>> buildContext.Compiler == "gc" {
>> p.Error = &PackageError{
>> ImportStack: stk.copy(),
>> Err: fmt.Sprintf("C source files not allowed when not using cgo
>> or SWIG: %s", strings.Join(p.CFiles, " ")),
>> }
>> return p
>> }
>>
>>
>> Well if the go file being compiled doesnt need any c files, why is "gc"
>> even trying to see the c files ?
>>
>> How do I achieve my intent ?
>>
>
> IIRC, you can use the same build tags syntax in C/C++ files than in your
> Go files.
>
> Just put, e.g.,
> // +build !linux
>
> as the first line of your C/C++ file.
>
> hth,
> -s
>
>
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