https://llvm.org/bugs/show_bug.cgi?id=31863
Bug ID: 31863
Summary: Clang can't read back a PCH just produced: Assertion
failed: (D && "Cannot get layout of forward
declarations!"), function getASTRecordLayout
Product: clang
Version: 4.0
Hardware: PC
OS: All
Status: NEW
Severity: normal
Priority: P
Component: Modules
Assignee: unassignedclangb...@nondot.org
Reporter: mehdi.am...@apple.com
CC: dgre...@apple.com, llvm-bugs@lists.llvm.org
Classification: Unclassified
Created attachment 17936
--> https://llvm.org/bugs/attachment.cgi?id=17936&action=edit
Repro reduced
Clang-4.0 (and trunk) are crashing when building Unreal Engine, a PCH can't be
read back we hit this assertion. I believe this is a regression from clang-3.9
introduced in r276159:
Author: Richard Smith <richard-l...@metafoo.co.uk>
Date: Wed Jul 20 14:10:16 2016
[modules] Don't emit initializers for VarDecls within a module eagerly
whenever
we first touch any part of that module. Instead, defer them until the first
time that module is (transitively) imported. The initializer step for a
module
then recursively initializes modules that its own headers imported.
For example, this avoids running the <iostream> global initializer in
programs
that don't actually use iostreams, but do use other parts of the standard
library.
Reduced repro attached. Run with:
clang -c -x objective-c++-header pre.h -std=c++14 -o pre.gch
clang -c -x objective-c++ /dev/null -std=c++14 -include-pch pre.gch
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