https://bugs.llvm.org/show_bug.cgi?id=49917
Bug ID: 49917
Summary: MSVC fails to compile SmallVector.cpp targeting arm32
Product: libraries
Version: trunk
Hardware: PC
OS: Windows NT
Status: NEW
Severity: normal
Priority: P
Component: Support Libraries
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected]
Attempting to compile LLVM 12.x for "ARM" architectures in VS2019 latest
(v16.9.2) will fail with the following errors:
llvm-project\llvm\include\llvm/ADT/SmallVector.h(528,1): error C2719: 'Elt':
formal parameter with requested alignment of 16 won't be aligned (compiling
source file llvm-project\llvm\lib\Support\SmallVector.cpp)
llvm-project\llvm\include\llvm/ADT/SmallVector.h(528,1): error C2719: 'Elt':
formal parameter with requested alignment of 32 won't be aligned (compiling
source file llvm-project\llvm\lib\Support\SmallVector.cpp)
This appears to be due to the static assertions in SmallVector.cpp causing
template instantiation of:
void growAndAssign(size_t NumElts, T Elt)
Since this is an explicitly-aligned element being passed on the stack, MSVC
will complain because apparently that's not supported on this architecture. The
code compiles fine for x86/Win32, x64/amd64, and arm64.
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