Comment 1:

Labels changed: added priority-soon, cgo, removed priority-triage.

Status changed to Accepted.

Comment 3:

Please tell us the contents of hi.go.  Thanks.

Comment 4:

My current sources are with too many dependencies to share. Will try to construct a
small example.
Following are the conditions under which problem occurs:
1. hi.go uses another library mylib
2. The mylib library in turn links to a my own 32-bit C library
3. GOHOSTARCH is amd64
4. Install mylib with GOARCH=386 and CGO_ENABLED=1
5. If GOARCH is set to 386 (with default CGO_ENABLED value which is 0) -> happens if one
uses another shell or logins in after few days and unsuspectingly just sets GOARCH
Now trying to build hi.go gives errors as above.

Comment 5:

Additional hint - probably related issue:
Installing a cgo package when CGO_ENABLED=0, fails silently 
// mylib.go (in exp/cgoerr/mylib package)
package mylib
/*
#include <stdio.h>
#include <stdlib.h>
void myprint(char* s) {
    printf("%s", s);
}
*/
import "C"
import "unsafe"
func Funca() {
    cs := C.CString("Hello from stdio\n")
    C.myprint(cs)
    C.free(unsafe.Pointer(cs))
}
func Funcb() {
    fmt.Println("...in mylib Funcb()")
}
> cd $GOPATH/src/exp/cgoerr/mylib
> export CGO_ENABLED=0
> go install .               --> no error message inspite of failure
> ls $GOPATH/pkg/linux_386   --> no package is installed

Comment 6:

I see two bugs in your report.
1. Your program hi.go is importing "cglib" but that package has
declared some other name for itself (not cglib), which is why you
see both `imported and not used: "cglib"` and `undefined: cglib`
when you try to use it.
I fixed this yesterday. The first error will now say
    ./hi.go:4: imported and not used: "cglib" as pkgname
where pkgname is whatever cglib has declared itself to be.
2. If you are in a directory with only cgo files but cgo is disabled,
'go install .' fails to print an error (it does nothing).
I will make this bug about #2.

Comment 7:

Labels changed: added go1.2, removed go1.2maybe.

Comment 8:

This issue was closed by revision 611b182.

Status changed to Fixed.