如何在cgo中应用`export LD_LIBRARY_PATH`

Question

我使用以下 main.go 调用 cpp lib 所以

package main

/*
#cgo LDFLAGS: -L/home/roroco/Dropbox/cpp/cpp_lib/draft/go_call_cpp -lprogress
#include "progress_lib.h"

// Callback function to be called from C++
extern void progressCallback(int progress);
*/
import "C"
import (
    "fmt"
    "sync"
)

var wg sync.WaitGroup

//export progressCallback
func progressCallback(progress C.int) {
    fmt.Printf("Progress: %d%%\n", progress)
    if progress == 100 {
        wg.Done()
    }
}

func main() {
    wg.Add(1)
    go func() {
        C.do_work(C.progress_callback(C.progressCallback))
    }()
    wg.Wait()
}

当我第一次导出 LD_LIBRARY_PATH 然后运行代码时，代码运行良好

~/Dropbox/cpp/cpp_lib/draft/go_call_cpp $ export LD_LIBRARY_PATH=/home/roroco/Dropbox/cpp/cpp_lib/draft/go_call_cpp:$LD_LIBRARY_PATH
~/Dropbox/cpp/cpp_lib/draft/go_call_cpp $ go run main.go
Progress: 0%
Progress: 10%

当我直接运行代码时，它会引发错误：

~/Dropbox/cpp/cpp_lib/draft/go_call_cpp $ go run main.go 
/tmp/go-build2581226776/b001/exe/main: error while loading shared libraries: libprogress.so: cannot open shared object file: No such file or directory
exit status 127

我希望不要在cli中导出LD_LIBRARY_PATH，而是将export LD_LIBRARY_PATH放在我的main.go中，我该怎么办？

Answer 1

我使用-Wl，-rpath代替导出LD_LIBRARY_PATH，以下是完整代码

package main

/*

#cgo CFLAGS: -I${SRCDIR}

#cgo LDFLAGS: -L${SRCDIR} -lprogress -Wl,-rpath,${SRCDIR}

#include "progress_lib.h"

// Callback function to be called from C++

extern void progressCallback(int progress);

*/

import "C"

import (

"fmt"

"sync"

)

var wg sync.WaitGroup

//export progressCallback

func progressCallback(progress C.int) {

fmt.Printf("Progress: %d%%\n", progress)

if progress == 100 {

wg.Done()

}

}

func main() {

wg.Add(1)

go func() {

C.do_work(C.progress_callback(C.progressCallback))

}()

wg.Wait()

}