Questions tagged [compilation]

For questions regarding contracts compilation.

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This declaration shadows an existing declaration(problem with compile)

function isOwner(address _owner) public view returns (bool isOwner) { return owners[_owner]; } function isOwnerChoice(address _owner, address _newOwner) public view returns (bool ...
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1answer
25 views

ParserError: Expected ',' but got ';'

I`m trying compilate this code and getting Parse error pragma solidity ^0.6.0; contract ZooFactory { event NewZoo(uint zooId, string name, uint dna); uint dnaDigits = 24; uint ...
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1answer
42 views

Does reentrancy attack happens as soon as the balance in storage is modified after the withdrawal?

I just saw something like this: function sub( uint a, uint b ) internal pure returns (uint) { require(b <= a, "SUB_UNDERFLOW"); return a - b; } function withdraw(...
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1answer
28 views

Why my contract binary does not set?

My project is in Truffle. I programmed a smart contract and want to deploy it with JavaScript. But the following error occurs: Error: Contract error: contract binary not set. Can't deploy new ...
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1answer
20 views

How to include constructor arguments in bytecode for smart contract deployment in genesis block?

Please excuse if the title is not perfectly accurate but I had a hard time fitting my problem into 1 question. If you have a better title please feel free to suggest it and i will edit it. I want to "...
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1answer
16 views

Compiling cpp-ethereum (aleth) sources as a part of my cpp project

I want to use cpp-ethereum aleth smart contracts sources in my altcoin project. My sources can compile with cmake or autotools system. I tried two ways to compile cpp-ethereum with my sources: Using ...
3
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0answers
174 views

Stack too deep when compiling inline assembly

I'm running into a YulException: Stack too deep when compiling inline assembly: Variable headStart is 1 slot(s) too deep inside the stack. using a smart contract that has this function. I took this ...
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166 views

remix compiler just won't end compiling

I've just started my journy with etherium, so now I am trying to get my first script complied. I tried starting with this project https://github.com/san-lee-ai/simple_auction But I could not get the ...
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81 views

Contract can't import remote repository locally

I made a compiler script that takes all contracts in folder ./contracts/ and produces a .json for each contract, containing an ABI and Bytecode. This worked fine for a while. However, I added some ...
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33 views

TypeError: Function overload clash during conversion to external types for arguments

Why do I get following error "TypeError: Function overload clash during conversion to external types for arguments." when using compiler version ^0.5.0; but when I choose 0.5.2; and later releases ...
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1answer
99 views

Can I deploy smart contract written in an older version of solidity ? If yes how to recognize it in EVM?

If I can compile a smart-contract written in an older version say 0.1.3, can I still deploy it? If I can, is there a way to look at EVM bytecode and tell that this smart contract is written with an ...
5
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1answer
525 views

Status of ABIEncoderV2 now

Do you know the current status of ABIEncoderV2? I want to know the current status of ABIEncoderV2 Live projects using ABIEncoderV2 right now Restriction on the normal encoder Risks of using ...
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1answer
124 views

#pragma compilation Error [duplicate]

pragma solidity ^0.4.0; contract test { event test_value(uint256 indexed value1); uint256 value_test; function test_f() { //value_test processing test_value(value_test)...
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2answers
62 views

Get values from stack when certain Opcode is called

I am currently trying to use genetic algorithms to automatically generate test cases that for ethereum smart contracts similar to https://ieeexplore.ieee.org/abstract/document/7840029>this paper. In ...
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2answers
213 views

Error while compiling Solidity code via py-solc

I am getting the following error while attempting to compile Solidity code via py-solc. Is it due to a new update of py-solc? how can I fix it? >>> from . import views File "/home/manzik/...
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1answer
526 views

How to compile Solidity ^0.5.5 contract with Node.js?

I am terribly new in Solidity and now I try to learn how to compile a contract in Solidity ^0.5.5 (No versions below). I have the contract as follow (UsersContract.sol) pragma solidity ^0.5.5; ...
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1answer
897 views

Invalid implicit conversion from address to address payable requested

first of all really nice to find this forum, I'm starting coding Solidity. Here the problem I get compiling a template of crowdsale smart contract ExampleTokenCrowdsale.sol, from this tutorial. The ...
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17 views

Unexpected behaviour. Huge size increase when adding new SubContract()

I have a contract similar to: contract Contract01 { SubContract _refContract; ... constructor() public { refContract = new SubContract(); } function setSubContractRef(SubContract ...
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1answer
59 views

how to change approveAndCall() function for upgraded compiler version of solidity 0.5.1 from 0.4.6?

Here is the code snipped which is used when I'am working with compiler version 0.4.6 : function approveAndCall(address _spender, uint256 _value, bytes memory _extraData) public returns (bool success) ...
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2answers
461 views

Solidity ,Member“transfer”Not found or not visible after argument dependent lookup in address

pragma solidity ^0.4.11; /** * @title Ownable * @dev The Ownable contract has an owner address, and provides basic authorization control * functions, this simplifies the implementation of "user ...
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2answers
1k views

Unable to run truffle compile

I want to run truffle compile on my AWS Ubuntu 18.4 server. I'm able to compile the same contracts on my local with no compilation errors but when I tried to run truffle compile on AWS ubuntu server ...
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0answers
99 views

My code compiles on remix.ethereum.org but not on etherscan.io please help! [closed]

I get this error " ParserError: Function, variable, struct or modifier declaration expected. function transferFrom(address _from, address _to, uint _value) public returns (bool) ^ " everytime ...
1
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1answer
62 views

How come npmjs website shows that Truffle latest version is 4.1.14, and that it was published 3 days ago?

According to this page, Truffle latest version is 4.1.14, and it was published 3 days ago. However: I have been using this version for months now. I have noticed this "published 3 days ago" several ...
7
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1answer
259 views

When did the Ethereum “free memory pointer” change? (6060… -> 6080…)

I have been digging a bit deeper into the Ethereum bytecode with the specific goal to do contract verification from the source code. I noticed, while doing some tests, that the initial bytes of the ...
2
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1answer
689 views

Remix is compiling the smart contract but not solc command

I am able to successfully compile a smart contract in remix IDE. However when I try to do the same with solc npm command, it shows a JSON error when compiling. Voting.sol pragma solidity ^0.4.25; ...
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1answer
321 views

Solidity: Function with same name but different parameter possible? [duplicate]

Will the contract auto detect wether I am calling the function with or without parameter? pragma solidity 0.4.25; contract A{ function test() public{ //do something } function ...
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1answer
134 views

Discrepancy in Solidity compiler output for Remix and offline (same version, same code)

I'm compiling the following contract locally and on Remix and getting two different bytecode results. Contract pragma solidity ^0.4.25; contract ReadBool { bool public flag; function ...
2
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1answer
62 views

What is this evm code produced by solc in this public array checking, and why?

When solc creates code for arrays when they are declared public. In particular, it contains a check on the length of the array. For example, this: contract OutOfBoundsException { uint256[8] ...
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0answers
65 views

Error on contract constructor - CompilerError: Stack too deep, try removing local variables [duplicate]

I have the following constructor on a contract: constructor( string name, string symbol, uint8 tokenResolution, string defaultUnderlying, uint maturityTimestamp, uint rate, ...
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2answers
459 views

Remix warning - Is constant but potentially should not be.

I am getting the warning on the code shown below. Could you please assist me know to resolve this warning ? warning message - "Is constant but potentially should not be"
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0answers
22 views

Manually configure EVM Assembly Tag

I have read that Ethereum during the compilation splits the code into tags. The solc optimizer doesn’t optimize across tags. If we consider “1+1”, it can be optimized to 0x2 if under the same tag: /...
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38 views

Compiling from remix onto geth console

I found how to deploy a contract onto MEW, but I do not understand, partially due to meta references and missing/assumed knowledge. I'm just looking from help on a walk through. I'm including the ...
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3answers
1k views

Remix always throws the error: exceeds block gas limit

Dear Ethereum developers. I started to learn Solidity this week and am trying to deploy a contract via Remix, but this doesn't really work. Running environment is set as Web3 Provider. (Because the ...
1
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1answer
619 views

Error compiling OpenZeppelin imported contracts

I'm running a truffle project and have imported OpenZeppelin contracts. While running truffle compile I'm facing following error: github.com/OpenZeppelin/openzeppelin-solidity/contracts/crowdsale/...
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1answer
66 views

Sending contract's source code to deployed contract in order to deploy it

I am writing a factory contract in solidity. I want to be able to add some more contracts to be deployed by the factory after it has been deployed. I thought sending the contract's source code to my ...
2
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1answer
96 views

Can't use constructor() when deploying a contract from ethereum wallet

Take the following code: pragma solidity 0.4.24; contract TestCoin { mapping(address => uint256) public balanceOf; uint256 public totalSupply; constructor(uint256 initialSupply) ...
3
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1answer
119 views

v0.4.22 solc compile failing - not predictable behavior

Error: Warning: Defining constructors as functions with the same name as the contract is deprecated. Use "constructor(...) { ... }" instead. function CappedCrowdsale(uint256 _cap) public { ^ (...
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2answers
1k views

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 =...
2
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1answer
265 views

solc producing different contract binary depending on OS

I have a Linux, and another person has a Mac. We have the same solc compiler version, except for the OS extension (I have 0.4.24+commit.e67f0147.Linux.g++, they have 0.4.24+commit.e67f0147.Darwin....
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2answers
159 views

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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1answer
371 views

Deploying a smart contract with several solidity files

I have a contract contains 4 .sol files and when I generate its bytecode and api as follows: > solc --bin GreenToken.sol > solc --abi GreenToken.sol I receive: ======= BasicToken.sol:...
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1answer
47 views

Use shared library type in contracts

I want to reuse on type DateRange in two contracts. However, I fail with multiple errors. Currently I have one error: G21FE98E9 Member "endTicks" not found or not visible after argument-dependent ...
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0answers
398 views

Solcjs doesn't use the last version of compiler

I am compiling a contract using the npm package solcjs. The package is at version 0.4.21 (npm view solc). However compilation fails because my pragma is set to ^0.4.21 while solcjs states current ...
4
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1answer
324 views

Difference between unoptimized and optimized solidity code

I am trying to find a source on what the difference is between optimized and unoptimized code. My main question is what the unoptimized compiler does, especially in the sense of calling the SSTORE ...
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0answers
57 views

Automatically deploy a contract with generated Web3js code

I want a command line tool which having only contract source would automatically not only compile it but also automatically create the JS code which can deploy the contract through Web3.js (using user ...
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0answers
69 views

About using Solidity optimization

It is a well known fact that in optimizing mode compilers usually have more bugs than in non-optimizing mode. As such, do you recommend to use the Solidity compiler with or without optimization? My ...
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2answers
183 views

How would I best resolve this specific type of 'Unused local variable' warning?

I have a function which returns multiple values. In some places I use all of them, while in other places I use only some of them. This short snippet can illustrate the problem: contract A { ...
3
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1answer
270 views

How to use evm compile?

I have been testing with evm and I am not getting any output. Code - pragma solidity ^0.4.18; contract d8 { function myBalance() pure public returns (uint) { return 880; } } My ...
5
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1answer
245 views

Why does inserting a Struct cost 5,000 extra gas per item in the Struct?

Related to the findings in: Solidity bool size in Structs Why does inserting a Struct cause an increase of 5,000 gas per item in the Struct? For example: // A Struct that, when tightly packed, is ...
3
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0answers
173 views

What's the difference between unlinked_binary and bytecode?

I have two different projects. In one, the build/token.json file contains an unlinked_binary field. In the other, there's no unlinked_binary, but there's bytecode. What's the difference between the ...