[Buildroot] [Bug 9251] New: Shared C++ libraries for Microblaze results in Segmentation Fault

[Buildroot] [Bug 9251] New: Shared C++ libraries for Microblaze results in Segmentation Fault

[bugzilla at busybox.net]

https://bugs.busybox.net/show_bug.cgi?id=9251

            Bug ID: 9251
           Summary: Shared C++ libraries for Microblaze results in
                    Segmentation Fault
           Product: buildroot
           Version: 2016.08
          Hardware: Other
                OS: Linux
            Status: NEW
          Severity: major
          Priority: P5
         Component: Other
          Assignee: unassigned at buildroot.uclibc.org
          Reporter: scotttimothye at johndeere.com
                CC: buildroot at uclibc.org
  Target Milestone: ---

It appears that enabling C++ and shared libraries does not work for Microblaze
targets.  When a simple Hello World C++ application is executed, it results in
a Segmentation Fault.  This occurs before any code in the app is executed
(presumably the fault is occurring in the libstdc++ startup code.)

Host environment: Linux Mint 15, 32-bit x86 platform.  wbx has also replicated
it on an x86_64 system with similar results.

Steps to reproduce using buildroot git hash
ed5604ed9e378c3f8814d7f92ec66fd855b8245c:

1) make qemu_microblazeel_mmu_defconfig
2) make menuconfig
- Toolchain: enable C++ support
3) make
4) cat > hello.cpp
int main(void){}
5) output/host/usr/bin/microblazeel-linux-g++ hello.cpp -o
output/target/root/hello
6) make
7) Running qemu 2.5.1.1:
qemu-system-microblazeel -M petalogix-s3adsp1800 -serial stdio -kernel
output/images/linux.bin
8) Let the system boot.  Login w/password "root"
9) ./hello
-> Segmentation Fault.

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[Buildroot] [Bug 9251] Shared C++ libraries for Microblaze results in Segmentation Fault

[bugzilla at busybox.net]

https://bugs.busybox.net/show_bug.cgi?id=9251

--- Comment #1 from scotttimothye at johndeere.com ---
If you follow up the previous steps by defining "static-only" libraries, then
the C++ app works:

1) make menuconfig
2) Build Options > Libraries > static only
3) make clean
4) (See previous steps for build steps)
5) ./hello
-> No seg fault

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[Buildroot] [Bug 9251] Shared C++ libraries for Microblaze results in Segmentation Fault

[bugzilla at busybox.net]

https://bugs.busybox.net/show_bug.cgi?id=9251

--- Comment #2 from Thomas Petazzoni <thomas.petazzoni@free-electrons.com> ---
Waldemar has identified that this is a regression between binutils 2.25 and
binutils 2.26. I.e, with binutils 2.25, C++ programs linked dynamically work
fine on Microblaze. Starting with binutils 2.26, they no longer work.

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[Buildroot] [Bug 9251] Shared C++ libraries for Microblaze results in Segmentation Fault

[bugzilla at busybox.net]

https://bugs.busybox.net/show_bug.cgi?id=9251

--- Comment #3 from scotttimothye at johndeere.com ---
Changing to binutils 2.25 does not correct the problem.  I just repeated the
original steps below, altering step 2) to include selection of binutils 2.25.1
during the menuconfig.  Further, I also enabled Host Utilities > host qemu >
Enable system emulation.

I built everything from scratch against the latest Buildroot repo
(446debc47ef42db10e96973355f441da7685929a) and launched qemu (Buildroot built
v2.7.0).  Trying to run the simple ./hello program resulted in a segmentation
fault.

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[Buildroot] [Bug 9251] Shared C++ libraries for Microblaze results in Segmentation Fault

[bugzilla at busybox.net]

https://bugs.busybox.net/show_bug.cgi?id=9251

--- Comment #4 from scotttimothye at johndeere.com ---
(In reply to scotttimothye from comment #3)

Just to clarify comment #3, it should read "I just repeated the original
steps," rather than "I just repeated the original steps below,"

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[Buildroot] [Bug 9251] Shared C++ libraries for Microblaze results in Segmentation Fault

[bugzilla at busybox.net]

https://bugs.busybox.net/show_bug.cgi?id=9251

mail at waldemar-brodkorb.de changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
         Resolution|---                         |WORKSFORME

--- Comment #5 from mail at waldemar-brodkorb.de ---
I checked with master on x86_64 host.
With gcc 5.x and binutils 2.25.1/2.26.1/2.27.
I couldn't reproduce the segfault anymore.

So may be reopen it with exact version of buildroot, gcc, binutils and
C library used. And if it is happening on x86 or x86_64 host.

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