[llvm-bugs] [Bug 42524] New: Need better error message for running out of file handles

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=42524

            Bug ID: 42524
           Summary: Need better error message for running out of file
                    handles
           Product: clang
           Version: trunk
          Hardware: PC
                OS: All
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: Frontend
          Assignee: unassignedclangbugs at nondot.org
          Reporter: nicolasweber at gmx.de
                CC: llvm-bugs at lists.llvm.org, neeilans at live.com,
                    richard-llvm at metafoo.co.uk

We've had two cases in Chromium where clang ran out of file handles (in one
case due to a now-fixed file handle leak regression in clang, in the other case
due to a too-low ulimit on a bot). These bugs were:

https://bugs.chromium.org/p/chromium/issues/detail?id=861345#c32
https://bugs.chromium.org/p/chromium/issues/detail?id=924225

The error behavior in this case is that clang says

    fatal error: 'cc/input/scroll_state.h' file not found

for random header files, which isn't very helpful for figuring out what's going
on.

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