The header file smi.h from libsmi (https://github.com/mikeowens/libsmi)
declares a typedef using "long double"
typedef long double SmiFloat128;
In Go versions prior to 1.11, programs using smi.h compiled without error.
In Go 1.11, cgo calls out "long double" as "unexpected". Here is that
changed behaviour:
bruce@calochilus:/tmp$ go version
go version go1.11 linux/amd64
bruce@calochilus:/tmp$ go build longdouble.go
# command-line-arguments
-: unexpected: 16-byte float type - long double
bruce@calochilus:/tmp$ go1.10/bin/go version
go version go1.10.3 linux/amd64
bruce@calochilus:/tmp$ go1.10/bin/go build longdouble.go
bruce@calochilus:/tmp$ cat longdouble.go
package main
/*
#cgo LDFLAGS: -lsmi
#include <stdlib.h>
#include <smi.h>
*/
import "C"
import (
"fmt"
)
type SmiType struct {
smiType *C.struct_SmiType
}
func main() {
fmt.Println("Hello")
}
bruce@calochilus:/tmp$
So this raises two questions for me:
a) is it a bug that the error message does not include a line number (the
code in cmd/cgo/gcc.go tries to print a line number)
b) what is a 'best practice' approach to handling such an incompatible
C-type?
Regards
Bruce
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