Re: git: 7ecd99fa424d - main - Build compiler-rt against libunwind, not libcxxrt

From: Dimitry Andric <>
Date: Wed, 09 Mar 2022 22:50:12 UTC
On 9 Mar 2022, at 22:45, John Baldwin <> wrote:
> On 3/9/22 1:30 PM, Dimitry Andric wrote:
>> The branch main has been updated by dim:
>> URL:
>> commit 7ecd99fa424df001028c5cddc52d25b29232f1af
>> Author:     Dimitry Andric <>
>> AuthorDate: 2022-03-09 21:23:35 +0000
>> Commit:     Dimitry Andric <>
>> CommitDate: 2022-03-09 21:23:35 +0000
>>     Build compiler-rt against libunwind, not libcxxrt
>>          Parts of compiler-rt are also built for libgcc_eh and libgcc_s, and
>>     these were already pointing to the libunwind unwind.h. For the sake of
>>     consistency, also build compiler-rt itself against the libunwind
>>     unwind.h, not the libcxxrt one.
> Do we even need the explicit -I at all now that we install unwind.h into /usr/include?

That depends on the build order; if libcompiler_rt is built before libunwind's headers are installed into ${WORLDTMP}, it might look at the wrong file?

I guess this is just a 'better safe than sorry' approach. That said, for libcxxrt we used to have the unwind headers only in the C++ include path, so maybe this was a way to get that to work?