Failed to build rescue with gcc 4.9

Warner Losh imp at
Fri Apr 3 21:10:14 UTC 2015

> On Apr 3, 2015, at 2:39 PM, Ed Maste <emaste at> wrote:
> On 3 April 2015 at 13:02, Warner Losh <imp at> wrote:
>> That shows that something in the list is needed. Likely only crunchhide.
>> It doesn’t tell us why we need it, or when we started needing it, or what
>> other conditions we might need it. This information is critical to document
>> so we know when we can stop doing it in the future. I’m extremely reluctant
>> to commit this until we know these details.
> Yes, it's crunchide. It was broken prior to r277259:
> |    crunchide: Correct 64-bit section header offset
> |
> |    For 64-bit binaries the Elf_Ehdr e_shoff is at offset 40, not 44.
> |    Instead of using an incorrect hardcoded offset, let the compiler
> |    figure it out for us with offsetof().
> |
> |    Differential Revision:
> It's not completely clear to me why we did not encounter this before;
> a comment before the erroneous write states:
> /*
> * update the offset of section header table in elf
> * header if needed.
> */
> so I presume something about the object file created by gcc 4.9 causes
> this code to be executed, while builds using the in-tree compiler did
> not.

Ah Yes! I remember now! We should find the FreeBSD version at that date
and either build it when we’re cross compiling, or rebuild it when we’re

Thanks for finding this Ed.


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