[llvm-bugs] [Bug 52489] New: clangd can exhaust all disk space in /tmp by writing preamble-*.pch files

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=52489

            Bug ID: 52489
           Summary: clangd can exhaust all disk space in /tmp by writing
                    preamble-*.pch files
           Product: clang-tools-extra
           Version: unspecified
          Hardware: PC
                OS: All
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: clangd
          Assignee: unassignedclangbugs at nondot.org
          Reporter: ehsan.akhgari at gmail.com
                CC: llvm-bugs at lists.llvm.org

I use the `clangd` extension in Visual Studio for a very large C++ project
based on the Chromium code base.

I've noticed that `clangd` leaves behind preamble PCH files inside /tmp so
frequently that I run out of disk space once every couple of weeks, with /tmp
using 116GB, 130GB, etc worth in these files.

I noticed that others have experienced this issue too (e.g.
https://youtrack.jetbrains.com/issue/CPP-19402) and some people recommend
passing -pch-storage=memory to clangd.  However I have 16GB of RAM on this
server and I am unsure whether doing this is a good idea for a project of this
size.

Could clangd be modified to manage these files better and prevent the out of
disk space scenario?

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