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

[Matthew Weber]

Romain,

On Fri, Sep 6, 2019 at 10:11 PM Matthew Weber
<matthew.weber at rockwellcollins.com> wrote:
>
> 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/
>

# find output/host/ -name  crtbegin.o
output/host/opt/ext-toolchain/lib/gcc/aarch64-linux-gnu/8.3.0/crtbegin.o
# output/host/bin/clang -print-search-dirs
programs: =/accts/mlweber1/tmp.M0HlOc7IKF-buildroot/output/host/bin:/..//bin
libraries: =/accts/mlweber1/tmp.M0HlOc7IKF-buildroot/output/host/lib/clang/8.0.1:/accts/mlweber1/tmp.M0HlOc7IKF-buildroot/output/host/aarch64-buildroot-linux-gnu/sysroot/lib/../lib64:/accts/mlweber1/tmp.M0HlOc7IKF-buildroot/output/host/aarch64-buildroot-linux-gnu/sysroot/usr/lib/../lib64:/accts/mlweber1/tmp.M0HlOc7IKF-buildroot/output/host/aarch64-buildroot-linux-gnu/sysroot/lib:/accts/mlweber1/tmp.M0HlOc7IKF-buildroot/output/host/aarch64-buildroot-linux-gnu/sysroot/usr/lib


> 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



-- 

Matthew Weber | Associate Director Software Engineer | Commercial Avionics

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