Questions tagged [compiler]

A compiler is a computer program that translates a higher-level programming language into a lower-level language. For example: Solidity is compiled into EVM opcodes.

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Solidity Compiler - Error: Identifier already declared

Full source code of the file 'Test.sol' : pragma solidity ^0.4.23; contract Mortal{ address owner; string ownerInfo = "Contract Owner name XYZ"; constructor () public { owner =...
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Solidity: Best practices - Which compiler version should I use? Advantages / Disadvantages

Where is the main difference between: pragma solidity ^0.4.24; and pragma solidity 0.4.24; Why would I use one or the other? Advantages / Disadvantages? What effect will it have in the future when ...
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Does the solC compiler work in the geth Javascript console anymore

does the solC compiler work in the javascript console anymore, and if it does how can I install it. I have tried using the compiler methods in the javascript console api however they do not work and ...
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The contract will not compile: Member not found or not visible [closed]

This is my code: pragma solidity ^0.4.23; import "./SafeMath.sol"; import "./MintableToken.sol"; import "./Ownable.sol"; import "./BurnableToken.sol"; /** * @title Crowdsale * @dev Crowdsale is a ...
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How do I find out what compiler version was used to deploy with MyEtherWallet

If I deploy a contract on MyEtherWallet.com how can I find out what compiler version was used, for verifying the code on etherscan, etc.?
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ParseError in solidity code

This is the error i get. ParserError: Expected pragma, import directive or contract/interface/library definition. This is my Solidity contract code. pragma solidity ^0.4.6 contract Inbox { ...
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Solved: How to change Solidity linter [solc] compiler version in Visual Studio Code?

Hi may I know how to change my Solidity linter compiler version in Visual Studio Code(vscode)? OR Visual studio code how to specify solidity compiler version? The only Solidity related extensions I ...
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I've got an error while compiling.Use “constructor(…) { … }” instead

I've followed the lecture on Udemy. But I've got an error here's my 'Inbox/contracts/Inbox.sol' pragma solidity ^0.4.17; contract Inbox { string public message; function Inbox(string ...
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Solidity Help - Undeclared Identifier - onlyOwner WithdrawEther

I'm new to Solidity and attempting to add a withdraw ether function for my contract which enables me to release funds the parent contract account, but the compiler (remix) keeps on giving me an ...
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Where is the compiler in Remix?

I installed remix-ide. It is able to compile contracts. So it somehow calls Solidity compiler. Where is this compiler located in the filesystem and how to use it without remix-ide?
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Remix compiler is not loading and gives “Compiler not yet loaded.” message when attempting to force

This issue is occurring on both chrome and firefox. I have not changed anything from a week ago when it worked fine. The remix compiler works on Edge browser but not the other 2. If anyone has any ...
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What is auxdata in the asm output from solc?

I am using - solc --asm smartcontractname.sol I get at the end of the asm auxdata. I am trying to check different modules to see what is inherited. Does anyone know how auxdata is computed? Here is ...
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What is the keccak256 reference in opcodes from solc? [duplicate]

Opcodes - Opcodes: PUSH1 0x60 PUSH1 0x40 MSTORE CALLVALUE ISZERO PUSH1 0xE JUMPI PUSH1 0x0 DUP1 REVERT JUMPDEST PUSH1 0xA0 DUP1 PUSH2 0x1C PUSH1 0x0 CODECOPY PUSH1 0x0 RETURN STOP PUSH1 0x60 ...
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Solidity: ParserError: Expected pragma, import directive or contract/interface/library definition. uint private age; ^

I am using Atom together with etheratom and I don't get why this simple code won't run: pragma solidity ^0.4.19 contract MyFirstContract { string private name; uint private age; ...
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1answer
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Examples of functions limitations?

I coded different functions and didn't find a standard that define crystal clear how many variables you can use (fields, local or as parameters of modifiers inside this function? Do you know a ...
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Car Rental System Compile Error

I am writing code for a car rental system but i'm getting a few compile error messages that don't understand. The first error is TypeError: Expression has to be an lvalue. The second is ...
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Solidity Compile error: Identifier already declared

I'm trying to run my code but i get this error: Could not compile source code. " Identifier already declared. function addCar(string _make, string _model, unit _pricePerDay, uint _minRentalDay, ...
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1answer
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How to call & use ERC20 airdrop smartcontract

I'm using remix solidity browser compiler. I deployed this code for an AirDrop smart contract: https://pastebin.com/kzYxmEab I used the same address to create/deploy the Airdrop contract as was used ...
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“Mock compiler : Source not found” Error in Remix online IDE

I haven't been able to compile any solidity code because of this error. How do I solve this problem?
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1answer
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Compiling with outdated compiler

In my contracts I've been placing pragma solidity ^0.4.2; Without knowing my compiler is outdated at 0.4.16! Interestingly, all contracts still compile and are able to migrate to testrpc. Still, I ...
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1answer
239 views

Ethereum Wallet cannot complie “msg.sender.send”

I have been using Ethereum Wallet to compile and deploy contracts. Now I got this error when trying to test the code in CryptoKittyCore. It failed to compile with this message Failure condition of '...
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EVM Assembly tags

Studying the Solidity optimizer, I found that the assembly code is divided into tags and the optimizer doesn't work between them: It splits the sequence of instructions into basic blocks at JUMPs ...
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unable to verify the contract on etherscan.io. How to resolve this issue?

I am unable to verify the contract in etherscan.io. I was able to deploy the same solidity code in (Geth, Mist). But the same code I am unable to verify in etherscan.io. What mistake am I doing here? ...
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Can't compile contract - pragma error and Cannot read property 'interface' of undefined

I am trying to compile this simple contract: pragma solidity ^0.4.18; contract Tasks { struct TaskOwner { address TaskOwnerAddress; bytes32 TaskOwnerName; } mapping (address ...
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Remix Warning - No visibility specified, Violate Checks-Effects-Interaction pattern, Function state mutability can be restricted to pure - Can ignore?

Two months ago, I wrote a smart contract with Remix.ethereum.org. Line 1 of my code has: pragma solidity ^0.4.11; It compiled fine with no errors and nor warnings. I tested every function in ...
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558 views

How to execute web3 batch js file

New to solidity programming and I discovered this today at this site: var contract = new web3.eth.Contract(abi, address); var batch = new web3.BatchRequest(); batch.add(web3.eth.getBalance.request('...
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totalSupply() Solidity signature causing conflict error

I'm writing a very basic ERC20 token using solidity in the Mist wallet. For some reason the compiler doesn't like the totalSupply() function name. If I change this name it compiles fine. To be ERC20 ...
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1answer
163 views

In Node.js connected to Geth : solc.compile prefixes an additional ':' before contractName

I'm trying the following script on Node.js while running a node connected to Rinkeby Testnet (from https://github.com/ethereum/wiki/wiki/JavaScript-API#web3ethcontract): const fs = require("fs"); ...
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How to update the Ethereum Wallet Solidity Compiler

I'm using the latest Ethereum Wallet version which is 0.9.0 and I want to update my latest Solidity compiler since it seems that the wallet is using this version 0.4.13+commit.0fb4cb1a.Emscripten....
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118 views

error building solidity compiler with `brew upgrade`. build from source?

This is the error message I got after recently running brew upgrade: The command which solc, still outputs: /usr/local/bin/solc Is this a problem? Maybe I should uninstall and reinstall my ...
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Is there a “gas penalty” for using too many asserts in a contract?

I'm at a very puzzling scenario. While using Remix, I noticed that adding a few asserts has caused a significant increase in execution cost (from ~50K to ~59K). And not only did it increase the ...
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1answer
631 views

Node JS module in Geth is not found

I have installed solC module with command: npm install solc How can I use this module in Geth? When I execute var solc = require("solc") in Geth's console, interpreter throws: Error: Cannot find ...
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753 views

Truffle Compile on Windows “Could not find a suitable configuration file” [duplicate]

I am trying to do a simple Truffle Compile on window 10 using git bash but i keep getting "Could not find a suitable configuration file" I have tried "Truffle Compile" after running truffle init. I ...
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1answer
589 views

Undeclared identifier when compiling with truffle compile

I have this contract and can't figure out where's the problem. Any ideas? (I'm a noob in solidity, just started a few days ago). HelloWorld.sol file: mapping (address => uint) balances; function ...
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239 views

Why was the Solidity compiler removed in geth 1.6.0?

Why was the Solidity compiler removed in geth 1.6.0? What is the procedure to deploy a contract in geth 1.6.0?
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(web3.js) The method eth_compileSolidity does not exist/is not available [duplicate]

I have tried to develop a javascript function with web3.js to compile a solidity contract. In html/javascript code, I have prepared the following. var contract_code = "pragma solidity ^0.4.....[omit ...
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2answers
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Solidity optimizer vs LLVM optimizer

Looking at the evmjit code I noticed that the LLVM optimizer is actually used right before execution of a contract by the virtual machine. I have also noticed that the Solidity compiler has its own ...
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2answers
188 views

web3.eth.compile.solidity enable/disable optimization

Is there any way to enable/disable compiler optimisation when using web3.eth.compile.solidity(...) PS: using solc-js is not considered
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1answer
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solc: exit status 1 when compiling my contract on my private blockchain

I was trying to compile an example contract as told in the official website: here it was successful to setSolc and getCompilers ,but some errors occur when compiling the contract available on that ...
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1answer
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Solidity function that accepts mapping as input

Is it possible for Solidity to accept mappings as input parameter in a function? I've been trying to create a function with a second parameter mapping (string => string) aMapping, pragma solidity ^0....
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2answers
900 views

How does solidity online compiler link libraries?

Suppose I have this code: import "github.com/Arachnid/solidity-stringutils/strings.sol"; contract Contract { using strings for *; // ... } For this solidity online compiler generates this ...
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Remix Solidity compiler is giving error (Expected token Semicolon got 'Returns')

When I debug a similar contract in Remix: function ConstructorFunction(uint _inputOne, uint _inputTwo){ callsAnotherFunction('string') returns (bool success); } I am returned this error: ...

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