llvm/test/MC/COFF/bss_section.ll

; RUN: llc -mtriple i386-pc-win32 < %s | FileCheck %s

%struct.foo = type { i32, i32 }

@"\01?thingy@@3Ufoo@@B" = global %struct.foo zeroinitializer, align 4
; CHECK: .bss

$thingy_linkonce = comdat any
@thingy_linkonce = linkonce_odr global %struct.foo zeroinitializer, comdat, align 4
; CHECK: .section .bss,"bw",discard,_thingy_linkonce
[-cxx-abi microsoft] Stick zero initialized symbols into the .bss section for COFF Summary: We need to do two things: - Initialize BSSSection in MCObjectFileInfo::InitCOFFMCObjectFileInfo - Teach TargetLoweringObjectFileCOFF::SelectSectionForGlobal what to do with it This fixes PR16861. Reviewers: rnk Reviewed By: rnk CC: llvm-commits Differential Revision: http://llvm-reviews.chandlerc.com/D1361 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@188244 91177308-0d34-0410-b5e6-96231b3b80d8 2013-08-13 01:23:53 +00:00			`; RUN: llc -mtriple i386-pc-win32 < %s \| FileCheck %s`

			`%struct.foo = type { i32, i32 }`

			`@"\01?thingy@@3Ufoo@@B" = global %struct.foo zeroinitializer, align 4`
			`; CHECK: .bss`
MC COFF: Emit the 'b' section flag for .bss sections in GNU assembly Without this, assembling clang's disassembly would produce an object file with the IMAGE_SCN_CNT_INITIALIZED_DATA section characteristic rather than the uninitialized one. link.exe would warn when merging comdats with different flags. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@197529 91177308-0d34-0410-b5e6-96231b3b80d8 2013-12-17 22:12:40 +00:00
Bring r226038 back. No change in this commit, but clang was changed to also produce trivial comdats when needed. Original message: Don't create new comdats in CodeGen. This patch stops the implicit creation of comdats during codegen. Clang now sets the comdat explicitly when it is required. With this patch clang and gcc now produce the same result in pr19848. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@226467 91177308-0d34-0410-b5e6-96231b3b80d8 2015-01-19 15:16:06 +00:00			`$thingy_linkonce = comdat any`
			`@thingy_linkonce = linkonce_odr global %struct.foo zeroinitializer, comdat, align 4`
MC: Emit COFF section flags in the "proper" order COFF section flags are not idempotent: 'rd' will make a read-write section because 'd' implies write 'dr' will make a read-only section because 'r' disables write git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@228490 91177308-0d34-0410-b5e6-96231b3b80d8 2015-02-07 08:26:40 +00:00			`; CHECK: .section .bss,"bw",discard,_thingy_linkonce`