http://llvm.org/bugs/show_bug.cgi?id=9148
Summary: [ENH] Support the 'ms_abi' and 'sysv_abi' attributes
Product: libraries
Version: trunk
Platform: PC
OS/Version: All
Status: NEW
Severity: enhancement
Priority: P
Component: Backend: X86
AssignedTo: [email protected]
ReportedBy: [email protected]
CC: [email protected]
The Win64 and System V x86-64 ABIs have different calling conventions.
Currently, LLVM picks the right convention based on the target triple.
GCC does this too, but it also allows code to override the default using two
attributes, 'ms_abi' and 'sysv_abi', which pick the Win64 and System V x86-64
conventions, respectively.
Sixty-four-bit Wine (http://www.winehq.org/) uses the ms_abi attribute
extensively in order for its DLLs to have the correct calling convention.
Without this support, LLVM-based compilers can't build 64-bit Wine.
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