https://bugs.llvm.org/show_bug.cgi?id=41625
Bug ID: 41625
Summary: Clang uses >8GB of RAM to build a PCH for a simple
header
Product: clang
Version: 8.0
Hardware: PC
OS: Linux
Status: NEW
Severity: normal
Priority: P
Component: C++
Assignee: unassignedclangb...@nondot.org
Reporter: poletti.ma...@gmail.com
CC: blitzrak...@gmail.com, dgre...@apple.com,
erik.pilking...@gmail.com, llvm-bugs@lists.llvm.org,
richard-l...@metafoo.co.uk
Compiling a PCH for the following code:
struct Wrapper {
struct X {};
using Y = X(X(X(X(X(X(X(X(X(X(X(X(X(X(X(X())))))))))))))));
};
With a command like:
clang-8 -x c++-header file.h -o file.pch
Uses several GBs of RAM (>8).
If you want to reproduce, you might want to set a RAM limit in the current
shell, e.g. with "ulimit -Sv 8000000" otherwise your PC might start swapping
and/or become unresponsive.
I tested the following versions of Clang (on Ubuntu Linux):
8.0.0: affected
7.0.1: affected
6.0.1: NOT affected
So this seems to be a regression in Clang 7.x.
The above example is a minimized version of real code in
https://github.com/google/fruit, where building PCHs now fails in Travis CI
with OOM errors.
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