ast and legacyAST missing from sol-compiler output

[BlinkyStitt]

Expected Behavior

sol-compiler's docs point to https://solidity.readthedocs.io/en/develop/using-the-compiler.html#input-description which made me think this should work:

        "outputSelection": {
            "*": {
                "": [
                    "legacyAST",
                    "ast"
                ],
                "*": [
                    "abi",
                    "evm.bytecode.object",
                    "evm.bytecode.sourceMap",
                    "evm.deployedBytecode.object",
                    "evm.deployedBytecode.sourceMap",
                    "userdoc",
                    "devdoc"
                ]
            }
        }

Current Behavior

I don't see any keys for ast or legacyAST in the output.

Context

I am trying to generate truffle artifacts for a bunch of contracts written by other people with older varying versions of solidity. If they were all solidity 0.5, I could just let truffle do the compiling, but they don't support compiling different versions of contracts in the same project. My hope is to use sol-compiler to compile everything and then write a small script that translates sol-compiler's output to truffle-contract. More details at trufflesuite/truffle#1607 (comment)

[BlinkyStitt]

So my contracts that are compiled with solidity 0.4 now have ast and legacyAST as part of their output, but the contracts with solidity 0.5.2 don't. Should I share my code, or is that enough information?

[BlinkyStitt]

Actually I'm not sure about that. I ran the build again and now they all have AST. Investigating more now.

[BlinkyStitt]

Must have been something about caches. I cleared everything and built again and the ast generated as expected. Thanks!

[LogvinovLeon]

Yes. That's because sol-compiler consideres artifacts generated by the previous version of sol-compiler up to date if they have the same source hash and compiler settings. We should probably have another invalidation key there. Smth like sol-compiler-version. But it's kinda low-pri.