Commit 4d1d6185ab added this nsenter_unsupported.go file in order for nsenter to be a valid (but empty, non-functional) Go package on unsupported platforms. However, on such platforms, Go still complains because there exists a .c file in this folder, but the package doesn't use cgo.
Fix that by importing "C" pseudo-package.
Signed-off-by: Dmitri Shuralyov <shurcooL@gmail.com>
The change 699429e60f that allows the
constructor attribute to not be optimized out on gccgo has resulted in a
warning when compiling on the golang compiler.
```
./nsenter.go: In function ‘_cgo_51505a0edd5d_Cfunc_init’:
./nsenter.go:40:49: warning: unused variable ‘a’ [-Wunused-variable]
```
the generated code produced an unused struct like:
```
void
_cgo_d6cfae95ae01_Cfunc_init (void *v)
{
struct
{
char unused;
} __attribute__ ((__packed__, __gcc_struct__)) * a = v;
init ();
}
```
Truly the "fix" would be upstream in cgo. If it knows it is producing an
unused struct, then it should also include __attribute__ ((unused))
Signed-off-by: Vincent Batts <vbatts@hashbangbash.com>
Dmitri Shuralyov
Mrunal Patel
jianbosun
Qiang Huang
Alexander Morozov
Vincent Batts
Michael Crosby