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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questions
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1answer
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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
...
1
vote
2answers
48 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
17 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
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0answers
34 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
45 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 ...
1
vote
1answer
120 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 ...
0
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0answers
26 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/...
0
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1answer
15 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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0answers
16 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 ...
1
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1answer
63 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
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1answer
53 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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173 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 ...
1
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1answer
19 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 ...
1
vote
0answers
66 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
31 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 ...
1
vote
1answer
261 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,...
0
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4answers
352 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
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1answer
23 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
456 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
43 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 ...
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2answers
1k 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
65 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, ...
1
vote
2answers
256 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
35 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
vote
0answers
188 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
307 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
422 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
1k 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 ...
0
votes
2answers
52 views
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.
1
vote
1answer
2k 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 ...
1
vote
2answers
2k views
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 ...
1
vote
0answers
102 views
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.
1
vote
2answers
77 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 ...
0
votes
1answer
80 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 ...
0
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0answers
116 views
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 ...
0
votes
2answers
2k views
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 ...
0
votes
1answer
538 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 ...
0
votes
1answer
130 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?
0
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0answers
72 views
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 ...
0
votes
1answer
88 views
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....
1
vote
2answers
2k 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 ...
0
votes
1answer
96 views
Problem with wallet.transfer in newer solidity compilers
I read the documentation of the changes on 0.5.0 but I do not know how to get this done with my code snippet. I tried to make the constructor payable but this does not work. Can someone help me. The ...
0
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0answers
912 views
Can we eliminate specifying solc compiler version at the beginning of each smart contract.
Is it possible to eliminate specifying the solc compiler version at the beginning of each smart contract. This would help in separating the compiler version from the smart contract, so if the compiler ...
4
votes
2answers
3k views
Switch solc compiler versions
I have solc v0.5.2 on my system, but I have several contracts, that require solc < v0.5, so that I get errors:
Error: Source file requires different compiler version
What is the best way to run ...
0
votes
1answer
256 views
I build solc from source v0.4.18 but can't not use it to compile solidity. How can I solve this problem?
$ solc --bin -o ./contracts SimpleStore.sol
Warning: This is a pre-release compiler version, please do not use it in product ...
1
vote
1answer
431 views
Nested structs that are part of a mapping broken in Solidity 0.5.0?
The following code compiled successfully with Soldity 0.4.21. With 0.5.0 it triggers a fatal compilation error as follows:
UnimplementedFeatureError: Encoding type "struct TestNestedStructInMapping....
0
votes
1answer
381 views
Is it safe to call revert() instead of returning a value?
I have the following piece of code:
function func() public returns (bool) {
if (some condition on msg.sender) {
do some stuff
return true;
}
revert();
}
The compiler (0.4....
2
votes
2answers
28 views
Can I count on this general pattern executing correctly (similarly to C, C++ and probably any other language)?
Suppose I have something like this:
contract MyToken is ERC20 {
MyTokenImpl private myTokenImpl;
constructor(MyTokenImpl _myTokenImpl) public {
myTokenImpl = _myTokenImpl;
}
...
1
vote
1answer
93 views
Deploying fails with different compile version
I'm trying to implement a simple card game. Actually, everything is working fine. Until I tried to move from 0.4.0 to 0.4.22. Any idea what is going wrong?
Thanks a lot. And here the code:
pragma ...
2
votes
1answer
2k views
Why is there a difference between a public array and a function which returns it?
On-chain example:
pragma solidity 0.4.24;
contract MyContract {
uint[] public array;
constructor() public {
array.push(1);
array.push(2);
array.push(3);
}
...
