[Buildroot] [PATCH 07/11] package/busybox: fix applets runtime issue when building with clang cross-compiler

Matthew Weber matthew.weber at rockwellcollins.com
Sat Sep 7 03:11:44 UTC 2019


Romain,

On Fri, Sep 6, 2019 at 4:10 AM Romain Naour <romain.naour at smile.fr> wrote:
>
> Apply a patch contributed by Luis Marques on the Busybox mailing list [1]
> fixing a runtime issue (segfault) when busybox is compiled by Clang.
>
> The patch disable the compiler optimizations for Clang/LLVM only.
>
> Without this patch, busybox segfault with several applets
> (login on aarch64 using Clang 8.0.1, init on x86_64 using Clang 9.0.0rc3)
>
> [1] http://lists.busybox.net/pipermail/busybox/2019-June/087337.html
>

Got a "crtbegin.o no such file or directory" error when I setup a
build using master with qemu_aarch64_virt_defconfig (updated for
prebuilt external toolchain and enabling clang as cross-compiler).
https://paste.ubuntu.com/p/wxrmVTGVvp/

>From your comment earlier on irc that you tested with 9.0.1 (x86_64
and aarch64), I wonder if this error is a difference between building
with clang 8.0.1 and 9.

I was able to build compiler-rt & libfuzzer with your series applied
and pass a runtime test (system still cross compiled with gcc but
using "[01/11] package/clang: help host-clang to find our external
toolchain" to find the sysroot).  This was instead of using the -B
option when building libfuzzer as part of the runtime test.

Matt



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