源文件需要不同的编译器版本: Truffle

Question

我写了一个简单的智能合约，并尝试用松露迁移它。

$ truffle migrate
Compiling .\contracts\Election.sol...
Compiling .\contracts\Migrations.sol...

    /D/ethereum/electiondemo/contracts/Migrations.sol:1:1: SyntaxError: Source file requires different compiler version (current compiler is 0.5.0+commit.1d4f565a.Emscripten.clang - note that nightly builds are considered to be strictly less than the released version
    pragma solidity ^0.4.24;
    ^----------------------^

Compilation failed. See above.`enter code here`
Truffle v5.0.0 (core: 5.0.0)
Node v8.11.1

坚实的版本是0.5.0。请查找以下智能合约代码：

pragma solidity ^0.5.0;

contract Election {
    // Read/write candidate
    string public candidate;

    // Constructor
    constructor ( ) public {
        candidate = "Candidate 1";
    }
}

Answer 1

得到了解决方案:在truffle.js中。您需要指定实度版本

module.exports = {
   // See <http://truffleframework.com/docs/advanced/configuration>
   // for more about customizing your Truffle configuration!
   networks: {
       development: {
           host: "127.0.0.1",
           port: 7545,
           network_id: "*" // Match any network id
       }
   },
   compilers: {
       solc: {
           **version: "0.4.24"** // ex:  "0.4.20". (Default: Truffle's installed solc)
       }
   }
};

在您的智能合同中提供相同的需求

Answer 2

将以下行添加到truffle-config.js

{
  compilers: {
    solc: {
      version: "0.4.24" // ex:  "0.4.20". (Default: Truffle's installed solc)
    }
  }
}

Answer 3

这就是我在合同上使用的

 pragma solidity >=0.7.0 <0.9.0;

在配置文件中

compilers: {
    solc: {
      // default is 0.5.16
      version: ">=0.7.0 <0.9.0",    // Fetch exact version from solc-bin (default: truffle's version)
    
      }
    }
  },