https://bugs.llvm.org/show_bug.cgi?id=41865
Bug ID: 41865
Summary: [ms] #pragma bss_seg fails to apply to globals with
user provided constructors
Product: clang
Version: unspecified
Hardware: PC
OS: Windows NT
Status: NEW
Severity: enhancement
Priority: P
Component: Frontend
Assignee: unassignedclangb...@nondot.org
Reporter: r...@google.com
CC: llvm-bugs@lists.llvm.org, neeil...@live.com,
richard-l...@metafoo.co.uk
Consider:
$ cat t.cpp
struct Foo {
int x, y;
Foo() : x(1), y(2) {}
};
#pragma bss_seg("my_bss")
Foo gv;
$ cl -c t.cpp && dumpbin t.obj | grep bss
Microsoft (R) C/C++ Optimizing Compiler Version 19.20.27508.1 for x64
Copyright (C) Microsoft Corporation. All rights reserved.
t.cpp
8 my_bss
$ clang-cl -c t.cpp && dumpbin t.obj | grep bss
8 .bss
Clang thinks `gv` has an initializer, so it would apply the most recently
active data_seg pragma, instead of bss_seg. The code to control this is here:
https://github.com/llvm/llvm-project/blob/master/clang/lib/Sema/SemaDecl.cpp#L11926
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