bugfix: c.vim: Pull build directory from compilation database #2191
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The LLVM compiler database JSON already includes a directory where the
build was performed:
https://clang.llvm.org/docs/JSONCompilationDatabase.html
Prefer this directory for fixing relative paths in compiler include
arguments in ale#c#ParseCFlags.
Without this change, users cannot create a symlink to their compilation
database as suggested in the LLVM tooling setup instructions:
https://clang.llvm.org/docs/HowToSetupToolingForLLVM.html
Where are the tests? Have you added tests? Have you updated the tests? Read the
comment above and the documentation referenced in it first. Write tests!
Seriously, read
:help ale-dev
and write tests.