[compiler-rt] r248853 - [CMake] [macho_embedded] We need to set some extra flags when building the macho_embedded builtins.

[Chris Bieneman via llvm-commits]

I’m guessing you’re on an old clang. Apple Clang 602 had bugs in its aeabi support that were exposed by that change.

I have patches out for review that enable using the just-built clang when building compiler-rt that should make this issue go away:

http://reviews.llvm.org/D13399 <http://reviews.llvm.org/D13399>

Alternatively the current Xcode GM doesn’t exhibit this problem either.

-Chris

> On Oct 5, 2015, at 3:32 PM, Hans Wennborg <hans at chromium.org> wrote:
> 
> On Tue, Sep 29, 2015 at 4:21 PM, Chris Bieneman via llvm-commits
> <llvm-commits at lists.llvm.org> wrote:
>> Author: cbieneman
>> Date: Tue Sep 29 18:21:09 2015
>> New Revision: 248853
>> 
>> URL: http://llvm.org/viewvc/llvm-project?rev=248853&view=rev
>> Log:
>> [CMake] [macho_embedded] We need to set some extra flags when building the macho_embedded builtins.
>> 
>> If we don't specify the arm target the float ABI compiler flags get ignored.
> 
> This is causing problems when building Clang & compiler-rt on Mac for
> Chromium. The 10.10 SDK compiler now crashes like this:
> 
> fatal error: error in backend: Cannot select: 0x110008210: i32,i32 =
> udivrem 0x110001e70, 0x10c006928 [ORD=2] [ID=10]
>  0x110001e70: i32,ch = CopyFromReg 0x104008a20, 0x10c006508 [ORD=2] [ID=7]
>    0x10c006508: i32 = Register %vreg1 [ID=1]
>  0x10c006928: i32,ch = CopyFromReg 0x104008a20, 0x110008420 [ORD=2] [ID=8]
>    0x110008420: i32 = Register %vreg3 [ID=2]
> In function: __udivmoddi4
> 
> while compiling lib/builtins/udivmoddi4.c.
> 
> I suppose this patch made some flags change. Is some bad flag getting
> passed to the compiler, or is it just broken?
> 
> I put some more details here: http://crbug.com/539600
> 
> Thanks,
> Hans

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