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.
123
questions
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Can't compile Truffle project that imports a .sol with different pragma version
I have a contract pragma solidity 0.6.12 version that imports several 0.6.12 version contracts and one pragma solidity 0.8.0.
My truffle-config:
compilers: {
solc: {
version: "^0.6.12 &...
1
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0answers
18 views
Contract migration from Ethereum to L2
I am trying to figure out is it posible and how to migrate contracts from Ethereum main net to other L2.
So here what I found:
Migrating from contract in Solidity from Ethereum to Optimism is ...
0
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1answer
67 views
Hardhat.config.js: Expected a value of type HttpNetworkConfig?
Why is Hardhat throwing an error? I copy n pasted the default config file from https://hardhat.org/config/?
Error HH8: There's one or more errors in your config file:
Invalid value {"url":&...
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0answers
8 views
Brownie compile does not use correct compiler version (VScode)
I'm having and issue with the "brownie compile" command.
I've copied and pasted this contract from openzeppelin following a youtube tutorial, I then right clicked on it to change the ...
0
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1answer
16 views
contracts/ISwapRouter.sol:11:26: TypeError: Interfaces cannot inherit
So I am using some uniswapv3 contracts (which are pragma 0.7+) within another contract (which is pragma 0.5.0) and when compiling I have this error : ```These files import other files that use a ...
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1answer
9 views
I can't compile, on my library SafeMath it says "parsererror: function, vairable, struct or modifier declaration expected, please help me
pragma solidity ^0.8.2;
contract Token {
mapping(address => uint) public balances;
mapping(address => mapping(address => uint)) public allowance;
uint public totalSupply = ...
0
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0answers
15 views
Is there any solidity ide and compiler app for android or other mobie OS?
Please, I am teaching some secondary school pupils solidity and they wish to know if there are any IDEs and compiler apps for android devices.
They are young and most of them do not have PCs to ...
1
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1answer
44 views
etherscan contract verification unable to match bytecodes due to $-signs
I have a contract called Test , which uses a library called LCG. They are respectively defined in the .sol files with the same name as the contract:
// SPDX-License-Identifier: GPL-3.0
pragma solidity ...
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0answers
16 views
Error! Unable to generate Contract ByteCode and ABI (The bytecode being searched for is in the list of compiled contract bytecode outputs)
What's strange is the Bytecode the be searched for is right under the main .sol file...
I added in the correct code, recompiled on remix worked just fine. Inserted the correct compiler version, ...
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3answers
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compilerMetadata is modifying/artifacts/NAME_OF_CONTRACT.json
I have been getting a compiler warning in the online remix IDE that is not quite clear to me (the contract compiles and deploys without any errors):
compilerMetadata is modifying/artifacts/...
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1answer
38 views
searching for an elegant solc compiler solution
I firstly had a problem with import statement inside my contracts, I figured out that the solc compiler didn't handle import statement, and that we needed to make out own. With the help of some nice ...
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20 views
CONTRACT in Solidity Compiler does not stay in Price Consumer, it reverts back to Aggregator
CONTRACT in Solidity Compiler does not stay in Price Consumer, it reverts back to Aggregator?
Please assist with this question.
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2answers
407 views
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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0answers
20 views
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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2answers
33 views
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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2answers
653 views
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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0answers
30 views
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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1answer
93 views
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 ...
1
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1answer
37 views
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;
...
1
vote
2answers
100 views
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 ...
1
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2answers
58 views
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 ...
0
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1answer
33 views
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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1answer
701 views
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
...
1
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2answers
242 views
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 ...
0
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0answers
74 views
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() ...
0
votes
1answer
186 views
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 ...
1
vote
1answer
226 views
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 ...
3
votes
1answer
652 views
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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0answers
102 views
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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1answer
18 views
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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26 views
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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vote
1answer
109 views
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 ...
0
votes
1answer
64 views
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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387 views
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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vote
1answer
27 views
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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0answers
101 views
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 ...
0
votes
1answer
43 views
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
390 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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4answers
813 views
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; ^
...
0
votes
1answer
26 views
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....
0
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1answer
649 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/...
1
vote
2answers
90 views
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 ...
0
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2answers
3k views
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;
}
}
...
1
vote
1answer
118 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, ...
2
votes
2answers
473 views
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
...
0
votes
1answer
37 views
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'...
1
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0answers
271 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 ...
4
votes
1answer
394 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 ...
3
votes
2answers
785 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 ...
2
votes
4answers
2k views
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 ...
