Incremental build fails with debug assertion when passing config file via CLI

[ajafff]

TypeScript Version: 3.6.0-dev.20190711

Search Terms:

Code

tsc --init
touch index.ts
tsc -p tsconfig.json --incremental

Expected behavior:

No error, obviously. Note that there's no error with -b tsconfig.json.

Actual behavior:

It throws because it expects tsconfig.json to be an absolute path.

Error: Debug Failure. False expression: Paths must either both be absolute or both be relative
    at Object.getRelativePathFromDirectory (/Users/klaus/code/test/node_modules/typescript/lib/tsc.js:12564:18)
    at relativeToBuildInfo (/Users/klaus/code/test/node_modules/typescript/lib/tsc.js:76859:52)
    at convertToReusableCompilerOptionValue (/Users/klaus/code/test/node_modules/typescript/lib/tsc.js:76884:24)
    at convertToReusableCompilerOptions (/Users/klaus/code/test/node_modules/typescript/lib/tsc.js:76867:32)
    at getProgramBuildInfo (/Users/klaus/code/test/node_modules/typescript/lib/tsc.js:76825:22)
    at Object.newProgram.getProgramBuildInfo (/Users/klaus/code/test/node_modules/typescript/lib/tsc.js:76957:63)
    at Object.getProgramBuildInfo (/Users/klaus/code/test/node_modules/typescript/lib/tsc.js:74728:291)
    at emitBuildInfo (/Users/klaus/code/test/node_modules/typescript/lib/tsc.js:69511:32)
    at emitSourceFileOrBundle (/Users/klaus/code/test/node_modules/typescript/lib/tsc.js:69484:13)
    at forEachEmittedFile (/Users/klaus/code/test/node_modules/typescript/lib/tsc.js:69294:28)

Playground Link:

Related Issues:

Seems to be caused by ##31985 (@sheetalkamat)