readdir misbehaves when running 32-bit user space on a 64-bit-kernel - kernel/userspace interface mismatch in getdents64

Hey all,

Opening a bug report as per a request following this issue identified

at: https://lists.gnu.org/archive/html/guix-devel/2020-07/msg00124.html.

To recap, when running

the configure phase is failing to identify the C/CXX compiler

toolchains to compile a test CMake file. There is a variety of

CMakeError.log and other object outputs that populate the build

directory when ran with --keep-failed.

This seems to be reported before, but subsequently patched at

https://issues.guix.gnu.org/38454#3.This only occurs when using the

Qemu method of compiling on a foreign architecture, and is not present

when natively compiling on true hardware.

Thanks,

Brett Gilio

As Marius Bakke pointed out on IRC, this issue is related to a change in

CMake where after 3.15 they removed the explicit `#define

_FILE_OFFSET_BITS 64`. The solution solution to this is to add

to CMakes compilation procedure. This is a core-updates change. I will

leave this issue open for now in case this needs more

investigation. Since I am just coming off of a haitus I think there are

changes to the core-updates and staging procedures so I dont think I am

comfortable making this change myself.

Brett Gilio

merge 43513 42448

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retitle 43513 'getdents' misbehaves when emulating 32-bit code on a 64-bit-kernel host

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severity 43513 important

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retitle 43513 Kernel/userspace interface mismatch between 32 bit user space and 64 bit kernel - readdir

severity 43513 critical

retitle 43513 readdir misbehaves when running 32-bit user space on a 64-bit-kernel - kernel/userspace interface mismatch in getdents

retitle 43513 readdir misbehaves when running 32-bit user space on a 64-bit-kernel - kernel/userspace interface mismatch in getdents64