Swift"错误:在自动导入中:无法从AST上下文获取模块'foo':"

Question

通过以下设置(要点):

Package.swift:

import PackageDescription

let package = Package(
    name: "foo",
    dependencies: [
        .Package(url: "https://github.com/rxwei/LLVM_C", majorVersion: 1, minor: 0)
    ]
)

Makefile文件:

all:
    @swift build \
        -Xcc -I`llvm-config --includedir` \
        -Xlinker -L`llvm-config --libdir` \
        -Xlinker -rpath -Xlinker `llvm-config --libdir`

main.swift:

import LLVM_C.Core

func foo(_ a: Int) {
    let b = a * a
    print(b)
}

foo(4)

在make调试器中编译可执行文件并启动可执行文件后,我无法打印任何变量的值:

(lldb) b foo
Breakpoint 1: where = foo`foo.foo (Swift.Int) -> () + 12 at main.swift:4, address = 0x00000001000014dc
(lldb) r
Process 14376 launched: '/Users/emlai/Code/foo/.build/debug/foo' (x86_64)
Process 14376 stopped
* thread #1: tid = 0x226d5, 0x00000001000014dc foo`foo(a=4) -> () + 12 at main.swift:4, queue = 'com.apple.main-thread', stop reason = breakpoint 1.1
    frame #0: 0x00000001000014dc foo`foo(a=4) -> () + 12 at main.swift:4
   1    import LLVM_C.Core
   2    
   3    func foo(_ a: Int) {
-> 4        let b = a * a
   5        print(b)
   6    }
   7    
(lldb) p a
error: in auto-import:
failed to get module 'foo' from AST context:

(lldb) p a
Shared Swift state for foo has developed fatal errors and is being discarded.
REPL definitions and persistent names/types will be lost.
warning: Swift error in module foo.
Debug info from this module will be unavailable in the debugger.

error: in auto-import:
failed to get module 'foo' from AST context

如果我注释掉该import LLVM_C.Core行,一切正常.

这使我无法调试我的项目并取得进展.我怎样才能解决这个问题？

Answer 1

在网络上搜索此问题只会得到“its a lldb bug”。我发现调试的唯一方法是调试测试。但据我所知，您无法使用自己的main.swift脚本来运行测试。这导致multiple definition of 'main'.

因此，只需按照此处的说明进行操作https://swift.org/getting-started/#using-the-package-manager为包含测试的包创建所需的文件层次结构（使用swift package init或手动），编写一些测试，运行swift test，最后，lldb .build/debug/fooPackageTests.xctest（<binary name>PackageTests.xctest是用于运行测试的二进制文件）。我想它在某些方面的编译方式与常见的二进制文件不同。至少这对我来说有效:)

祝调试顺利！:)