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Bug 9148 - [ENH] Support the 'ms_abi' and 'sysv_abi' attributes
Summary: [ENH] Support the 'ms_abi' and 'sysv_abi' attributes
Status: RESOLVED FIXED
Alias: None
Product: libraries
Classification: Unclassified
Component: Backend: X86 (show other bugs)
Version: trunk
Hardware: PC All
: P enhancement
Assignee: Unassigned LLVM Bugs
URL:
Keywords:
Depends on:
Blocks:
 
Reported: 2011-02-05 11:01 PST by Charles Davis
Modified: 2013-08-30 11:42 PDT (History)
4 users (show)

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Description Charles Davis 2011-02-05 11:01:46 PST 
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.
Comment 1 Charles Davis 2013-08-30 11:42:50 PDT 
Both are implemented as of r189644.