Bug#1017765: (no subject)

[Jochen Sprickerhof]

Control: affects -1 - libeigen3-dev src:pcl

Hi Sylvestre,

Anton added an upstream patch to libeigen3-dev to work around this:

https://gitlab.com/libeigen/eigen/-/commit/fb05198bddcc21b97232df5f4000583d66d033b3

I don't have enough insights if this is actually a bug in clang or 
rather something that used to work but should not, so feel free to 
close.

Cheers Jochen

* Jochen Sprickerhof <jspricke at debian.org> [2022-08-20 12:09]:
>Hi Sylvestre,,
>
>* Sylvestre Ledru <sylvestre at debian.org> [2022-08-19 23:46]:
>>Could you please provide a reduce test case?
>
>Sure, this produces the same error with clang++-14 on armel but works with
>clang++-13 and gcc:
>
>template <typename Packet> void psincos_float(Packet &_x) {
>  __asm__("" : "+g,w"(_x));
>}
>int main() {}
>
>Some context to the function is here:
>
>https://gitlab.com/libeigen/eigen/-/commit/82d61af3a490154ad1c0ae2fe00c561095854897#859198abc81bc7db86d6add0a16b27c957a7358b_1066_1070
>
>Cheers Jochen
>
>* Sylvestre Ledru <sylvestre at debian.org> [2022-08-19 23:46]:
>>Hello
>>
>>Could you please provide a reduce test case?
>>
>>Thanks
>>Sylvestre
>>On 2022-08-19 23:34, Jochen Sprickerhof wrote:
>>>Package: clang-14
>>>Version: 1:14.0.6-2
>>>Severity: normal
>>>X-Debbugs-Cc: jspricke at debian.org
>>>Control: affects -1 libeigen3-dev src:pcl
>>>
>>>Hi,
>>>
>>>on an up to date armel:
>>>
>>>jspricke at harris:~$ dd-schroot-cmd -c $sessionid apt-get install
>>>clang-13 clang-14 libeigen3-dev
>>>(sid_armel-dchroot)jspricke at harris:~$ echo -e "#include
>>><Eigen/Core>\nint main() {}" > eigen.cpp
>>>(sid_armel-dchroot)jspricke at harris:~$ clang++-14 -I
>>>/usr/include/eigen3 eigen.cpp
>>>In file included from eigen.cpp:1:
>>>In file included from /usr/include/eigen3/Eigen/Core:250:
>>>/usr/include/eigen3/Eigen/src/Core/arch/Default/GenericPacketMathFunctions.h:641:3:
>>>error: invalid output constraint '+g,w' in asm
>>> EIGEN_OPTIMIZATION_BARRIER(y_round)
>>> ^
>>>/usr/include/eigen3/Eigen/src/Core/util/Macros.h:1134:61: note:
>>>expanded from macro 'EIGEN_OPTIMIZATION_BARRIER'
>>>     #define EIGEN_OPTIMIZATION_BARRIER(X)  __asm__  ("" : "+g,w" 
>>>(X));
>>>                                                           ^
>>>In file included from eigen.cpp:1:
>>>In file included from /usr/include/eigen3/Eigen/Core:250:
>>>/usr/include/eigen3/Eigen/src/Core/arch/Default/GenericPacketMathFunctions.h:663:3:
>>>error: invalid output constraint '+g,w' in asm
>>> EIGEN_OPTIMIZATION_BARRIER(x)
>>> ^
>>>/usr/include/eigen3/Eigen/src/Core/util/Macros.h:1134:61: note:
>>>expanded from macro 'EIGEN_OPTIMIZATION_BARRIER'
>>>     #define EIGEN_OPTIMIZATION_BARRIER(X)  __asm__  ("" : "+g,w" 
>>>(X));
>>>                                                           ^
>>>In file included from eigen.cpp:1:
>>>In file included from /usr/include/eigen3/Eigen/Core:250:
>>>/usr/include/eigen3/Eigen/src/Core/arch/Default/GenericPacketMathFunctions.h:665:3:
>>>error: invalid output constraint '+g,w' in asm
>>> EIGEN_OPTIMIZATION_BARRIER(x)
>>> ^
>>>/usr/include/eigen3/Eigen/src/Core/util/Macros.h:1134:61: note:
>>>expanded from macro 'EIGEN_OPTIMIZATION_BARRIER'
>>>     #define EIGEN_OPTIMIZATION_BARRIER(X)  __asm__  ("" : "+g,w" 
>>>(X));
>>>                                                           ^
>>>3 errors generated.
>>>
>>>(sid_armel-dchroot)jspricke at harris:~$ clang++-13 -I
>>>/usr/include/eigen3 eigen.cpp
>>>(sid_armel-dchroot)jspricke at harris:~$ g++ -I /usr/include/eigen3 
>>>eigen.cpp
>>>
>>>This currently breaks src:pcl, can you have a look?
>>>
>>>Cheers Jochen
>>>
>>>
>>>-- System Information:
>>>Debian Release: bookworm/sid
>>> APT prefers unstable-debug
>>> APT policy: (500, 'unstable-debug'), (500, 'unstable')
>>>merged-usr: no
>>>Architecture: armel (armv7l)
>>>
>>>Kernel: Linux 4.19.0-21-armmp (SMP w/1 CPU thread)
>>>Kernel taint flags: TAINT_DIE
>>>Locale: LANG=C, LC_CTYPE=C.UTF-8 (charmap=UTF-8), LANGUAGE not set
>>>Shell: /bin/sh linked to /bin/dash
>>>Init: unable to detect
>>>
>>>Versions of packages clang-14 depends on:
>>>ii  binutils                2.38.90.20220713-2
>>>ii  libatomic1              12.1.0-8
>>>ii  libc6                   2.34-4
>>>ii  libc6-dev               2.34-4
>>>ii  libclang-common-14-dev  1:14.0.6-2
>>>ii  libclang-cpp14          1:14.0.6-2
>>>ii  libclang1-14            1:14.0.6-2
>>>ii  libgcc-12-dev           12.1.0-8
>>>ii  libgcc-s1               12.1.0-8
>>>ii  libllvm14               1:14.0.6-2
>>>ii  libobjc-12-dev          12.1.0-8
>>>ii  libstdc++-12-dev        12.1.0-8
>>>ii  libstdc++6              12.1.0-8
>>>ii  llvm-14-linker-tools    1:14.0.6-2
>>>
>>>Versions of packages clang-14 recommends:
>>>pn  llvm-14-dev  <none>
>>>ii  python3      3.10.6-1
>>>
>>>Versions of packages clang-14 suggests:
>>>pn  clang-14-doc  <none>
>>>
>>>-- no debconf information
>>


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