Re: [go-nuts] [cgo ] Export go function to C - illegal character

[nicolas_boiteux via golang-nuts]

i have some news.

With this kind of declaration
extern void __fastcall RVExtension(char *output, int outputSize, const char 
*function){
    goRVExtension(output, outputSize, function);
}; 

// export goRVExtension
func goRVExtension(output *C.char, outputsize C.size_t, input *C.char) {
    temp := fmt.Sprintf("Hello %s!", C.GoString(input))
    // Return a result to Arma
    result := C.CString(temp)
    defer C.free(unsafe.Pointer(result))
    var size = C.strlen(result) + 1
    if size > outputsize {
        size = outputsize
    }
    C.memmove(unsafe.Pointer(output), unsafe.Pointer(result), size)
}


i have this error message during the build

go : # command-line-arguments
Au caractère Ligne:1 : 1
+ go build -o armago.dll -buildmode=c-shared armago.go 2> result.txt
+ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    + CategoryInfo          : NotSpecified: (# 
command-line-arguments:String) [], RemoteException
    + FullyQualifiedErrorId : NativeCommandError
 
C:\Users\code34\AppData\Local\Temp\go-build126339458\b001\_x002.o: In 
function `*@RVExtension@12':*
C:/Users/code34/go/src/github.com/code34/armago_x64/armago.go:8: multiple 
definition of `@RVExtension@12'
C:\Users\code34\AppData\Local\Temp\go-build126339458\b001\_x001.o:/tmp/go-build/armago.go:8:
 
first defined here
C:\Users\code34\AppData\Local\Temp\go-build126339458\b001\_x001.o: In 
function `@RVExtension@12':
/tmp/go-build/armago.go:9: undefined reference to `goRVExtension'
C:\Users\code34\AppData\Local\Temp\go-build126339458\b001\_x002.o: In 
function `@RVExtension@12':
C:/Users/code34/go/src/github.com/code34/armago_x64/armago.go:9: undefined 
reference to `goRVExtension'
collect2.exe: error: ld returned 1 exit status

# command-line-arguments
In file included from _cgo_export.c:4:0:
armago.go: In function 'RVExtension':
armago.go:9:2: warning: implicit declaration of function 'goRVExtension' [-
Wimplicit-function-declaration]
# command-line-arguments
.\armago.go: In function 'RVExtension':
.\armago.go:9:2: warning: implicit declaration of function 'goRVExtension' 
[-Wimplicit-function-declaration]
  goRVExtension(output, outputSize, function);
  ^

as you can see in error message this time the entry point is correctly 
identified as* @RVExtension@12* (but without underscore) , but i don't 
succeed to resolv the bug :(


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