Silence MSVC build alignment warnings

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@235450 91177308-0d34-0410-b5e6-96231b3b80d8

diff --git a/cmake/modules/HandleLLVMOptions.cmake b/cmake/modules/HandleLLVMOptions.cmake
index 27147dcfd29bd578adfeaa9b62aa7b8bb734a9ab..71a1902dcdd60e7ea835204008207704c3f05cac 100644 (file)
--- a/cmake/modules/HandleLLVMOptions.cmake
+++ b/cmake/modules/HandleLLVMOptions.cmake
@@ -304,7 +304,15 @@ if( MSVC )
     -wd4611 # Suppress 'interaction between '_setjmp' and C++ object destruction is non-portable'
     -wd4805 # Suppress 'unsafe mix of type <type> and type <type> in operation'
     -wd4204 # Suppress 'nonstandard extension used : non-constant aggregate initializer'
-    
+
+       # Idelly, we'd like this warning to be enabled, but MSVC 2013 doesn't
+       # support the 'aligned' attribute in the way that clang sources requires (for
+       # any code that uses the LLVM_ALIGNAS marco), so this is must be disabled to
+       # avoid unwanted alignment warnings.
+       # When we switch to requiring a version of MSVC that supports the 'alignas'
+       # specifier (MSVC 2015?) this warning can be re-enabled.
+    -wd4324 # Suppress 'structure was padded due to __declspec(align())'
+           
     # Promoted warnings.
     -w14062 # Promote 'enumerator in switch of enum is not handled' to level 1 warning.