Questions tagged [solc]
Questions related to the compiler for Solidity: solc
257
questions
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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.
1
vote
1answer
25 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?
6
votes
1answer
181 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 ...
0
votes
0answers
11 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 ...
0
votes
1answer
8 views
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 ...
0
votes
1answer
30 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 ...
0
votes
1answer
17 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 ...
0
votes
2answers
47 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-...
1
vote
1answer
391 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(...
0
votes
1answer
27 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 `...
0
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0answers
10 views
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 ...
0
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1answer
31 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....
1
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0answers
44 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/...
1
vote
1answer
37 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 ...
0
votes
0answers
37 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 ...
0
votes
1answer
30 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 ...
0
votes
0answers
15 views
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, ...
2
votes
3answers
413 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&...
0
votes
1answer
45 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 ...
1
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0answers
159 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 '...
1
vote
2answers
127 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 {
...
0
votes
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 ...
0
votes
0answers
25 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 ...
1
vote
1answer
19 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 ...
-1
votes
1answer
33 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 ...
0
votes
1answer
55 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 ...
0
votes
1answer
671 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 ...
0
votes
2answers
49 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 ...
3
votes
1answer
48 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-...
0
votes
1answer
133 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....
1
vote
1answer
45 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 ...
0
votes
2answers
91 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....
0
votes
2answers
20 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?
1
vote
1answer
90 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;...
1
vote
0answers
129 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 ...
1
vote
1answer
65 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("@...
1
vote
1answer
243 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
votes
1answer
268 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 ...
0
votes
1answer
316 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
votes
1answer
383 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 ...
1
vote
2answers
1k 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 ...
1
vote
1answer
48 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, ...
0
votes
1answer
252 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.
1
vote
1answer
315 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
0
votes
1answer
186 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&...
1
vote
1answer
43 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".
...
1
vote
1answer
24 views
BrowserSolc not defined
I'm trying to use BrowserSolc in my dApp, but it's just not loading, it seems. I've got browser-solc.min.js in the same folder as index.html, with the following near the top of the page:
<script ...
3
votes
1answer
124 views
1
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0answers
58 views
Cannot execute contract in non-intaractive scripts
I want to deploy and to execute ERC-20 contract on geth with non-interactive scripts. But, it seems that non-interactive scripts and console shows different results.
Enviroment
ubuntu 18.04(docker ...
4
votes
1answer
244 views
VS code Expected identifier, got 'LParen'solc
I keep getting this error/warning on my vscode when I emit events and build constructors.
or
After a bit of googling I understand it is something about my compiler, since solc <0.4.18 does not ...
