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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Solc Compiler : File import callback not supported

As a context I am trying to fork uniswap v2 contracts using my own compiler and deploy files. I am not using truffle, as I want to deeply understand before using a framework. When I run my compiler, I ...
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Is it typical for something to compile in solidity, and then suddenly stop compiling without any changes having been made?

I am being pestered by ParseError: Source failures non-stop. Curious if this is language dependent Github: https://github.com/aportno/project-koffie.git ParserError is being generated for every import ...
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Getting an error even using the same compiler version (Visual Code)

I made a contract using Remix and it's working perfectly. When I create a project in Visual Code (in order to make a DApp) I'm getting this error when I import a source of Chainlink: If I compile ...
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Set specific compiler version in truffle but still get “Source file requires different compiler version” error

I get the "Source file requires different compiler version (current compiler is 0.8.6+commit.11564f7e.Emscripten.clang)" at the first line: pragma solidity ^0.7.0; In truffle-config.js, I ...
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solidity compiler hashing function

What hashing function or encoding scheme does solidity default compiler use to encode or hash the data of smart contracts in remix ide?
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Solidity compiler 0.8.5 “Unreachable code.” Warning on certain parts of code that worked before

Now that I'm using the 0.8.5 compiler, I'm getting a warning that says "Unreachable code." for parts of my functions that didn't have any issues until 0.8.5 (works on any below that). Does ...
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Different bytecodes using solcjs and remix

Using solcjs in any contract ends up producing significantly longer bytecode that using remix For instance this simple smart contract pragma solidity >=0.8.0; contract test { uint256 public c; ...
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Using SafeMath with older Solidity compiler

I've been told SafeMath doesn't matter. Does SafeMath slow things down, cost more ETH, or does it add an extra level of stability? Will SafeMath be unsupported one day? contract SafeMath { function ...
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Compile Solidity to assembly keeping a correspondence with the source code

I would like to compile a contract written in Solidity (or even just the part relating to a single method) to study it and understand if I can optimize it. I already managed to get the bytecode as ...
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1INCH Version error

I got error importing and using 1INCH. The problem is in the versions. In IOneSplit.sol version is 0.5.0 (pragma solidity ^0.5.0). And IOneSplit imports IERC20 which is in 0.8.0 (pragma solidity ^0.8....
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How to import and compile contracts of different versions solidity

How to import and compile contracts of different versions using solidity in remix? When I import a contract I get this error: ParserError: Source file requires different compiler version (current ...
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What is a nightly build in solidity? [closed]

I have received an error that says so: ParserError: Source file requires different compiler version (current compiler is 0.8.3+commit.8d00100c.Emscripten.clang) - note that nightly builds are ...
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Silence visibility warning, state mutability can be restricted to pure

Suppose I have an interface: pragma solidity 0.7.6; interface Foo { function foo() public view returns(bool); } And a simplistic implementation like a mock: contract Bar is Foo { function foo() ...
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Remix IDE Waring for “Required Compiler Version”

I am well versed with solidity and often use Remix IDE. Quite recently, despite adding a compiler version in my code. I am still getting this warning Warning: Source file does not specify required ...
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Remix Solidity Smart Contract Stuck On Compiling State

The 1inch Smart Contract is unable to compile in Remix as it appears to be stuck in the Solidity compiling phase. Expected Create a new 1inch_38211317.sol smart contract file in Remix. Compile the ...
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How do I determine the most recommended (safest to use) version of Solidity?

I've seen this question pop-up a bunch of times: "is version 0.x.x safe to use in production?" Therefore, I'm wondering if there is a clear way to tell which versions are recommended for ...
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Solidity compiler,error:not found browser IERC20.sol

Who can halp me with error and codig fleshloan? I try use for my contract http://remix.etherium.org and i have a promlem with compiller,i use code from official docs aave https://www.docs.aave.com/...
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Stack too deep error [duplicate]

Not sure what the best approach is to get around this. New to solidity. I've read the complicated 'answers' to this that suggest using structs, arrays, etc. but I can't figure out how to address this. ...
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Different compile version solidity

Is there an automated tool to convert old smart contracts to the newest one? There are many breaking changes in different versions and it is hard to keep up with them all. I want to use my old ...
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Solidity Compiler and EVM relationship

When I compile the below code in 0.6.6 it doesn't compile (requires public) but in 0.7.3 it does compile. If I make the below code compilable (adding public) in 0.6.6 I can successfully deploy on ...
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faucet = (new Faucet).value(0.5 ether)(); Doesn't compile

I am practicing with the code examples from Andreas' Mastering Ethereum book Chapter 7. I don't understand why this does not compile when I made the Faucet constructor Payable. See images below. ...
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Remix Compiler Errors - Transferred GitHub .SOL Codes to Remix

I transferred all 23 Sol extension files (smart contracts for Syscoin and Ether) from GitHub to Remix but only 3 of them can be compiled and deployed. The rest of them show errors. [Here is the link ...
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Library calls fail depending on compiler version?

I'm trying to deploy my library and call it afterwards with the specific address. While testing this I encountered that the behavior changed over the course of compilers. I tried to follow How to call ...
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How to separately optimize bytecode?

This question is regarding the bytecode-optimizer of the solidity-compiler, not the yul-optimizer: Is there any way to separately optimize bytecode? Normally the solidity-compiler optimizes the ...
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How to detect compiler version given only Solidity Source Code

I've collected some random smart contracts from the internet, many of them do not specify compiler version using pragma in their source code. Is there any way or any tool that can help me identify the ...
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1answer
352 views

Compiler version incompatibility nightmare

I'm new to Solidity and Truffle. I'm trying to compile my Solidity code within Truffle to create an ERC-20 token. I have @truffle/hdwallet-provider and @openzeppelin/contracts as my dependencies. Now,...
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Trying to compile running: 'node compile.js', but get error: “assert.js:350 throw err;” [Udemy 'Complete Developers Guide' Course]

This is the first contract with this Udemy course. Trying to compile by running: "node compile.js" but get the following error: iii@iii:~/inbox$ node compile.js assert.js:350 throw err; ^ ...
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How do I update compiler for embark?

I am rewriting an old contract I had. I am using the latest version of OZ contracts.. but they require: pragma solidity ^0.6.2 I am using embark 5.2.3 and current compiler is 0.6.1+commit.e6f7d5a4....
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553 views

Contract import from GitHub gives an error “Unable to import ”undefined“: TypeError: Failed to fetch”

This would be an old issue, but the solutions I have seen on this site aren't working. I'm trying to import a contract of OpenZeppelin to my Remix IDE. import "https://github.com/OpenZeppelin/...
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How to publish in ethereum with “imports” ? or how to do?

Hello i have this question in my mind now : How to publish in ethereum with "imports" ? or how to do ? why i say this ? answer : when i wanna "verify and publish Contract Source Code" with a ...
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Function, variable, struct or modifier declaration expected [duplicate]

I am using the following code structure; pragma solidity ^0.5.0; contract TtdmToken { uint256 public totalSupply; function TtdmToken () public { totalSupply = 1000000; } } ...
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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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Function overriding versus Solidity Compiler Warning: Function state mutability can be restricted to pure

I have a function in a base contract that could have the state mutability modifier "pure" because it always returns true: BaseContract { function x(bytes memory) public ...
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Error While Compiling In Remix During Tutorial

During a tutorial on my first compile I received this error: :1:1: Parser error: Expected import directive or contract definition. pragma solidity ^0.5.12; ^ What's that about? How do I fix it? I'...
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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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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 ...
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559 views

Setting Remix default Compiler Version

Is it possible to set the default Compiler version in Remix? Each time I open Remix, the compiler defaults to version 0.5.0+commit.1d4f565a. However, there is currently up to version 0.5.10 available ...
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How to deploy Library contract separate from the main contract and link it

For deployment I am using remix. When I deploy Hello.sol the compiler typically merges SafeMath.sol as a part of the main contract (Hello.sol) and deploys. This adds up library and main contract's ...
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Solidity code sequence for owner

How can I make my code sequential, meaning I'd like functions to be performed in a certain order. Can I make a function not run able till another is run. An example would be great help.
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3k views

Function declared as view, but this expression (potentially) modifies the state requires payable

I'm trying to change the an address data variable to a one, which is selected via a function. Keep getting the below error. Function declared as view, but this expression (potentially) modifies the ...
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Type uint256 is not implicitly convertible to expected type int256

I'm trying to compile the following keep getting an error, even though used this before in second code and its working fine. Simply trying to change the temp to the new temperature set by the user, so ...
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What is the value range of the parameter optimize-runs when running the solidity compiler?

I would like to know what the allowed value range of the parameter optimize-runs is when running the Solidity compiler. I didn't find the answer in the official document of Solidity.
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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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82 views

ABIEncoderV2PackedStorage bug, is something to worry about? any info?

I have a simple factory of ERC-20 Tokens, deployed to Rinkeby using remix. When I create contracts with this factory and verify the code in Etherscan (using etherscan API) I am having this warning in ...
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solc command is generating empty .bin files

Firstly, this is not an inheritance problem like in this post I have the following two files ( ManagedWallet.sol & ManagedWalletLookup.sol ) pragma solidity ^0.4.24; contract ...
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Is there a way to download Remix IDE locally and access it from the Terminal (Linux)?

Is there a way to download Remix IDE locally and access it from the Terminal (Linux)? Hi, I think I have read that it should be possible to download Remix IDE and use it offline. In the latest ...
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562 views

Unhandled Rejection (Error): invalid string value (arg=“x”, coderType=“string”, value=5)

Using Truffle unbox react to unbox a boilerplate. received the following error from running npm run start Changes: Addition of "memory" parameters in the simpleStorage.sol Changed unit to string in ...
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184 views

Understanding the “.send” warning message

Warning: Failure condition of 'send' ignored. Consider using 'transfer' instead. Is this a new compiler warning, and what exactly does it mean?
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Why the same contract has more bytecode size in solidity 0.5 in compare to 0.4.24?

My earlier contract was compatible with solc@0.4.24. Now I am upgrading my contract to make it compatible with solidity 0.5 but it leads to an increase in bytecode size. AFAICT There is no change in ...
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Error in external function parameter defination for an interface

Dear community members, I have come across an error while defining an interface (just using the standard one interface ERC721TokenReceiver) this interface is mentioned in this link https://github....