Questions tagged [solc]

Questions related to the compiler for Solidity: solc

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18 views

Build with multiple solc versions?

My tokens and basic setup scripts are built in solidity 0.8.0 and I just downloaded GSN with OpenZeppelin because I need a platform which will fund users' few things. Now I can't compile because it ...
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23 views

Error: project ID does not have access to archive state

I am coding a script to deploy smart contracts using python web3, and I came across this error when I ran the script: ValueError: {'message': 'Returned error: project ID does not have access to ...
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1answer
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Adding new custom opcode to solidity

I have a problem with adding new opcode to solidity. I'm using solc (on C++) and geth(ethereum on Go). I want to add new opcode, that takes address payable, uint256, uint256, bytes memory and returns ...
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1answer
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Web3j generate command not running

I am trying to generate a java wrapper class for a solidity contract, I have compiled the file and have the abi and bin file, but when I run the command as follows: web3j solidity generate ...
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0answers
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How do I get solcjs to compile yul

I want to write a smart contract using pure Yul but I have no idea how I'm meant to configure / run solcjs to compile my yul code down to bytecode. Any pointers would be much appreciated.
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1answer
30 views

Do file names need to be UTF-8 for solc to be able to compile them?

I combed through the Using the compiler section in the Solidity documentation, but I couldn't find an answer for my question. Do file names need to be valid UTF-8 for solc to be able to compile them?
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1answer
548 views

Is the SafeMath library obsolete in solidity 0.8.0?

SafeMath was commonly used to revert the transaction on overflow and underflow, instead of allowing the number to wrap around. The solidity 0.8.0 release notes state: Code Generator: All arithmetic ...
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0answers
25 views

TypeError: Library functions must be implemented if declared for solc compiler version ^0.6.0 library implementation

Suppose I have the following code: // SPDX-License-Identifier: MIT pragma solidity >=0.4.21 <0.7.0; library SomeLib { function add(uint256 a, uint256 b) public returns(uint256); } contract ...
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1answer
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Library placeholders does not appear in bytecode of compiled contracts - Solc

I have compiled my contracts with solc module for nodejs. These contracts import and use some libraries. But in the deployed bytecodes of the contracts, there are no placeholders for librairies used ...
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1answer
132 views

Remix: ParserError: Expected pragma. import directive, or contract/library/interface definition

I'm trying to use Remix to interact with a suite of contracts. One of the contracts being used is OpenZeppelin's Ownable contract. I copied from the link above, and pasted it into Remix, with a few ...
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1answer
30 views

Deploying multiple contracts with different solc versions

I have a few contracts that I deploy with my 1_initial_migration.js. However some of them are of different solc version than others. Is there a way to change it programmatically before compiling and ...
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2answers
95 views

Resolve solidity compiler error

I am trying to create a smart contract and I am using ganache, visual studio code and truffle for that purpose. The versions installed in my windows system are: Truffle v5.1.49, Solidity v0.5.16 (solc-...
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1answer
1k views

Compiler solc expected a state variable declaration

I try example from book Mastering Ethereum: contract Faucet { function withdraw(uint withdraw_amount) public { require(withdraw_amount<=10000000000000000); msg.sender.transfer(...
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1answer
28 views

Updating array.length++ to array.push()

There is this piece of code that runs good with solc 0.5.0 updateValueAtNow(totalSupplyHistory, curTotalSupply + _amount); updateValueAtNow(balances[_user], previousBalanceTo + _amount); /// @dev `...
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0answers
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Does the Bytecode and ABI generated for each contract also include it's imports?

If not, how does a contract such as an ERC20 get deployed if each output has its own ABI and Binary file? When compiling with truffle, and looking at A.json (where A imports B and C) it seems that it ...
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1answer
42 views

I have a truffle version problem. and I've done it but it's not working

I've done npm install -g solc@0.4.16 and it reads solc@0.5.16 when doing the truffle version compilers: { solc: { version: "^0.4.26", // A version or constraint - Ex. "^0.5....
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0answers
99 views

solc unable to import scoped packages

I am trying to import these lines on solidity and compile it with solc import '@uniswap/v2-periphery/contracts/interfaces/IUniswapV2Router02.sol'; import '@uniswap/v2-periphery/contracts/interfaces/...
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1answer
39 views

Cannot reproduce Etherscan verified compilation for 0.6.6 contract

I'm trying to reproduce the following contract compilation on Etherscan: https://etherscan.io/address/0x7a250d5630b4cf539739df2c5dacb4c659f2488d#code. Runtime bytecode on-chain I can get the runtime ...
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56 views

Solc-js: error “before each” hook for “deploys a contract”: ReferenceError: accounts is not defined

I have just started building contracts. Kindly help me in resolving this error. Attached image of error. Lottery/contract/Lottery.sol: pragma solidity ^0.4.17; contract Lottery{ address public ...
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1answer
40 views

How do I receive a revert message using go-ethereum

How do I receive a revert message using go-ethereum? receipt, err := bind.WaitMined(context.Background(), client, tx) if err != nil { fmt.Errorf(err) } fmt.Println(receipt.Status) Now I can only ...
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0answers
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Abigen doesn't create free data retrieval call for public state variable

I'm looking at an example contract using go-ethereum. In the book, when a go file is created in Store.sol through abigen, the code that automatically gets the Version() string is generated. However, ...
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4answers
1k views

Solidity Error: Struct containing a (nested) mapping cannot be constructed

My version of solc: "solc": "^0.7.1", When I try to construct a struct that contains mapping, I got this error: "Struct containing a (nested) mapping cannot be constructed&...
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1answer
97 views

truffle solc specific compiler fail

,/C/Users/juhne/ipfs-image-dapp/contracts/Migrations.sol:1:1: ParserError: Source file requires different compiler version (current compiler is 0.5.16+commit.9c3226ce.Emscripten.clang - note that ...
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0answers
257 views

Conflicting solc versions on Truffle-test

I'm developing some smart contracts sing solc 0.7.0. I'm able to successfully compile and deploy the contracts, but when I try to run $truffle test I get the following error: Using network '...
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2answers
257 views

solc-js error: “before each” hook for “deploys a contract”: SyntaxError: Unexpected token u in JSON at position 0

The issue is probably here: const { interface, bytecode } = require('../compile');. interface in the test file is undefined. inbox/contracts/Inbox.sol: pragma solidity ^0.7.0; contract Inbox { ...
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0answers
31 views

How can know which is library's bytecode?

When I compile solidity file that has more then two contracts, Solc gives me some binaries. That binaries include bytecode of library. How can I know which one is library's bytecode if I don't have ...
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0answers
29 views

Why do solc v0.4.17 and v0.4.18 behave differently with the allow-paths primitive?

Here's an example contract: Nobody.sol pragma solidity ^0.4.17; contract Nobody { function die() public { selfdestruct(msg.sender); } } The solc JSON specification to compile the ...
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1answer
21 views

Compilation Eror: One contract accessing the variable of another contract

I am trying to compile two contracts. I am getting 'balance' variable error in "HoneyPotCollect.sol" contract. Is balance not a global contract variable? Somebody please guide me how to ...
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1answer
41 views

Trying to compile running: 'node compile.js', but get error: “assert.js:399 throw err;” [Udemy 'Complete Developers Guide' Course]

This is my hands on contract with this Udemy Course - Ethereum-and-solidity-the-complete-developers-guide This is the contract file, which contains two contracts - Campaign and FactoryCampaign. I ...
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1answer
62 views

Truffle and Buidler are compiling to very different bytecodes despite having same compiler settings

Truffle is giving > 24kB and out of gas errors, but Buidler is not. I have checked the number of characters in the 'deployedBytecode' of the JSON: Buidler 33k characters (so 16.5kB) Truffle 55k ...
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1answer
1k views

…is an abstract contract or an interface and cannot be deployed

I don't have any programming language experience. But i'm interested to learn how to create my own ERC20 token and it was sucessfully deployed without any error using remix ethereum. But, once i'm ...
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2answers
93 views

.json files for contracts are not created

I am really new in ethereum and solidity and I am having hard time to figure out how to get the .json equivalent for contracts. I have the Campaign.sol inside the contractsFolder. The Campaign.sol ...
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1answer
62 views

abi.decode() and unused variables

I am decoding bytes as the following: // Decode Solidity tightly packed arguments (uint8 _, uint128 stakeId, address behalf) = abi.decode(userData, (uint8, uint128, address)); // solhint-...
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1answer
227 views

How can I get the ABI from solc.compile? (^0.6.4)

In pragma solidity ^0.6.4; I wrote a contract and can get the byte code as follow: const solc = require("solc"); const path = require("path"); const fs = require("fs"); const inboxPath = path....
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1answer
62 views

How to pass constructor parameters to solc?

I'm trying to compile a Smart Contract to bytecode using solc. I'm on a Ubuntu VM so I have to rely on a simple-to-install cmd line application. Compilation works fine but it seems like I can't pass ...
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2answers
137 views

How to deploy multiple compiled solidity with web3?

So I have this codes const MultiSigWalletFactory = fs.readFileSync(path.resolve(__dirname, "MultiSigWalletFactory.sol"), "utf8"); const Factory = fs.readFileSync(path.resolve(__dirname, "Factory....
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2answers
21 views

Does solidity create unique outputs every time it compiles same exact code?

Is there any difference if I compile everytime I want to deploy another multisig wallet. Or I can just deploy another multisig wallet using the same compiled data?
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1answer
118 views

converting keccak from old version: pragma solidity 0.4.19; [duplicate]

I am trying to compile following code: pragma solidity 0.5.9; contract test{ //https://github.com/ethereum/solidity/issues/3469 address payable owner; mapping (address => bool) pd; uint public sS;...
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0answers
180 views

Truffle compiler stuck at 0.4.17

Coming from here: How do I specify a different Solidity version in a Truffle contract? I still have the same issue, except that even after trying all of the suggested solutions, and even having the ...
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1answer
95 views

Transaction does not get mined on rinkeby

so I'm trying to deploy my first contract on rinkeby using web3 and truffle/hdwallet-provider. even with different gas prices it doesn't get mined.Please help out. const HDWalletProvider = require("@...
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1answer
247 views

Getting Error while compiling: Stack too deep

Here is my code i have array not 16 variables in a function please help where i am wrong. struct Escrow { bytes16 contractID; uint256 sellingTokenAmt; uint256 feeAmtInSellingToken; ...
2
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1answer
436 views

truffle version and solcjs --version returns different versions

I want to change solc version on my system(downgrade from 0.5.16 to 0.4.17). I tried uninstalling it with npm -g uninstall solc and then installed with npm -g install solc@0.4.17 but it does not ...
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1answer
469 views

Using the correct/best solc version with Truffle and general tooling setup

I haven't worked with Truffle/Solidity for a while and I am trying to get my environment/toolchain configure correctly. I have some questions regarding the compiler config. I was originally not ...
2
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1answer
541 views

solc-v0.6.0: TypeError: Operator - not compatible with types tuple() and int_const 1

I am having this error on solc version 0.6.0. Basically I am returning length of the list and subtract 1 from it, where that value will be assigned to an uint variable. In general this command used ...
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2answers
2k views

Install Old Solc Compiler Versions

I would like to compile older versions of solc contract source code using a solc compiler on my local machine. Is there a website from which to download old solc compilers? Google revealed a GitHub ...
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1answer
60 views

Are there any risks of undefined behavior when calling a function which doesn't return anything using a prototype of it which returns bool?

According to the ERC-20 Token Standard, functions transfer and transferFrom should return a boolean value indicating success or failure: interface IERC20Token { function transfer(address _to, ...
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1answer
389 views

How do I install Go-ethereum and solidity on Debian10

I am using debain on wsl and I want to install ethereum and solidity for blockchain development but I am not able to find an exact way to do it.
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1answer
386 views

what is 'UnimplementedFeatureError: Not yet implemented - FixedPointType' error?

what is 'UnimplementedFeatureError: Not yet implemented - FixedPointType' error in solidity while compiling through truffle ? How to fix it ? Using solidity compiler version - 0.5.9
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1answer
242 views

Why does solc output bytecode that is not in valid hex format?

I compile my solidity file using the following command: solc Encoder.sol --bin --abi --optimize -o <output_dir>/ Then I try to deploy it in Geth: Encoder = eth.contract([<abi file content&...
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1answer
62 views

How to type cast fixed size byte arrays in solc 0.5.x?

In solc 0.4.28 I was able to do: uint foo = 42; bytes28 bar = bytes28(foo); but in 0.5.9 I'm getting the error: TypeError: Explicit type conversion not allowed from "uint256" to "bytes28". ...

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