Solidity-coverage: Coverage compilation fails with "Metadata too large"

[jo-es]

After running buidler coverage the process fails with InternalCompilerError: Metadata too large.. Already tried node --max-old-space-size=4096 ./node_modules/.bin/buidler coverage which yields the same error. Running sol-coverage via truffle works when prefixing node --max-old-space-size=4096.

yarn run v1.16.0
$ node --max-old-space-size=4096 ./node_modules/.bin/buidler coverage
> server:            http://127.0.0.1:8555
> ganache-core:      v2.10.1
> solidity-coverage: v0.7.4

Network Info
============
> port:    8555
> network: soliditycoverage


Instrumenting for coverage...
=============================

> Core/ACTUSTypes.sol
> Core/Conventions/BusinessDayConvention.sol
> Core/Conventions/ContractDefaultConvention.sol
> Core/Conventions/ContractRoleConvention.sol
> Core/Conventions/DayCountConvention.sol
> Core/Conventions/EndOfMonthConvention.sol
> Core/Core.sol
> Core/Schedule.sol
> Core/SignedMath.sol
> Core/Utils.sol
> Engines/ANNEngine.sol
> Engines/BaseEngine.sol
> Engines/CECEngine.sol
> Engines/CEGEngine.sol
> Engines/IEngine.sol
> Engines/PAMEngine.sol
> Engines/POF.sol
> Engines/STF.sol

Coverage skipped for:
=====================

> external/BokkyPooBah/BokkyPooBahsDateTimeLibrary.sol
> Migrations.sol
> test/TestCore.sol
> test/TestPOF.sol
> test/TestSignedMath.sol
> test/TestSTF.sol
Compiling...
Downloading compiler version 0.6.4
InternalCompilerError: Metadata too large.

> solidity-coverage cleaning up, shutting down ganache server
Error BDLR600: Compilation failed

For more info go to https://buidler.dev/BDLR600 or run Buidler with --show-stack-traces

solidity-coverage: 0.7.4
buidler: ^1.3.0

[cgewecke]

@jo-es This looks like a compiler error that's happening because of a size constraint at Solidity here

If you have a chance, could you see what happens if you go into your copy of buidler in node_modules and modify the compiler settings at this line so that useLiteralContent is false? e.g

settings: {
  metadata: {
-    useLiteralContent: true
+    useLiteralContent: false
},

Do you have a link to the repo & branch which triggers this error (if the project is public)?

[jo-es]

Thank you for the quick response. This is the repository: actus-solidity. Running node --max-old-space-size=4096 ./node_modules/.bin/buidler coverage in directory outputs that error.

Changing useLiteralContent to false fixes the problem.

[cgewecke]

@jo-es

Ok thanks, will need to open an issue / PR at buidler to make that setting configurable.

There's an open PR at buidler 497 that makes useLiteralContent configurable...

[alcuadrado]

in case someone is having this same problem, adding this to your builder config fixes it:

const {TASK_COMPILE_GET_COMPILER_INPUT} = require("@nomiclabs/buidler/builtin-tasks/task-names");

task(TASK_COMPILE_GET_COMPILER_INPUT).setAction(await (_, __, runSuper) => {
  const input = await runSuper();
  input.settings.metadata.useLiteralContent = false;
  return input;
})

[cgewecke]

Ah, maybe we could just add that here as a default.

[cgewecke]

Should be fixed in 0.7.7. Thanks @alcuadrado for the solution!