I am writing my contracts in solidity version defined as ^0.8.0. I want to use Uniswap router interface, which is using >=0.7.5. Why is the compilation failing even though a compiler version ^0.8.0 should fulfill both requirements?
Thank you
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1 Answer
^ or >= accept all the newer minor changes, but the major update will fail this condition:
^0.8.0 would accept 0.8.1, 0.8.2, ..., 0.8.x, but 0.9.0 will not be accepted.
>=0.7.5 will accept all 0.7.x versions, but 0.8.0 will fail.
Look up Semantic Versioning (Semver).
answered Feb 22, 2022 at 19:30
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I tried putting the >=0.7.5 verison to online semver checker and it says that version 0.8.0 fits the condition It also seems to be the case according to this youtube video. Commented Feb 22, 2022 at 20:52
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1That is because Solidity is following a different Semver system, where 0.x.0 is a major, and 0.0.x is a minor update (as in, 0.0.x updates bring in new non-breaking features, but 0.x.0 updates bring in some breaking features that cause incompatibility). Solidity docs on that: docs.soliditylang.org/en/v0.8.12/… Commented Feb 22, 2022 at 21:37
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