[PATCH] Add test for LinkModules warning on triple, modified by r203009. Datalayout is already tested.

[Pete Cooper]

Hi JF

Would it be possible to make the change to check for ‘WARNING’?

The reason I ask is that we have a GuardMalloc buildbot which is writing the following to stderr and so is failing to have an empty FileCheck line:

GuardMalloc[bash-30020]: Allocations will be placed on 16 byte boundaries.
GuardMalloc[bash-30020]:  - Some buffer overruns may not be noticed.
GuardMalloc[bash-30020]:  - Applications using vector instructions (e.g., SSE) should work.
GuardMalloc[bash-30020]: version 25

Thanks,
Pete
On Mar 10, 2014, at 6:27 PM, JF Bastien <jfb at chromium.org> wrote:

> I meant  the following (what I suggested earlier) will not work because t.a.err is empty.
> > ; RUN: cat %t.a.err | FileCheck --check-prefix=WARN-A %s
> > WARN-A-NOT:  WARNING: Linking two modules of different target triples:
> 
> Your checkin is fine, but I think it is possible to simplify it with
> ; RUN: llvm-link %s %S/Inputs/targettriple-a.ll -S 2>&1 | FileCheck %s --check-prefix=WARN-A
> ; RUN: llvm-link %s %S/Inputs/targettriple-b.ll -S 2>&1 | FileCheck %s --check-prefix=WARN-B
> 
> target triple = "e"
> 
> ; WARN-A-NOT: WARNING: Linking two modules of different target triples:
> ; WARN-A: target triple = "e"
> 
> ; WARN-B: WARNING: Linking two modules of different target triples:
> ; WARN-B: target triple = "e"
> 
> That could work too, but I think the original intent was to make sure that nothing gets emitted. I could change the test to:
> ; WARN-A-NOT: WARNING:
> To check that no warning got emitted, but at that point the existing check is strictly more general since it checks that nothing (including warnings) got emitted.
> 
> TL;DR: adding WARN-A-NOT is defensive since it's included in the other check, but removing the other check means we're testing for strictly less. I'm not sure that's a good idea.
> 
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