Incompatibility between boost 1.78.0 and libcxx 16 about boost-cpp-feedstock HOT 11 CLOSED

I tought backporting the fix in 1.78.0, but from #130 it seems that due to ABI breakage we cannot backport stuff to 1.78.0 .

You can rebuild that branch without upgrading the compiler. Then we don't have to worry about ABI breakage.

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Fixed by #135, I think that we can close, feel free to re-open if necessary.

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Any workaround? Is it possible to specify the libcxx version?

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Sure, possible workaround are:

• Define _LIBCPP_ENABLE_CXX17_REMOVED_UNARY_BINARY in your code if you are using libcxx 16, see robotology/robotology-superbuild#1375 (comment)
• Pin libcxx to <16, i.e. `mamba install "libcxx<16".

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On Azure DevOps libcxx<16 is used to create the ## Package Plan ##
but then the environment is reloaded and libcxx:16.0.0-h71dddab_0 re-installed...

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On Azure DevOps libcxx<16 is used to create the ## Package Plan ## but then the environment is reloaded and libcxx:16.0.0-h71dddab_0 re-installed...

I am not sure to which specific case are you referring to, if you link or provide more details it is easier to help you.

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I am not sure to which specific case are you referring to, if you link or provide more details it is easier to help you.

Sure: I have a feedstock configured to be use with $conda smithy rerender which reciepe/meta.ymel requierment part is (with the libcc requierment added):

`requirements:

build:
    - python                             # [build_platform != target_platform]
    - cross-python_{{ target_platform }} # [build_platform != target_platform]
    - cmake >=3.0
    - make
    - {{ compiler('cxx') }}
    - {{ compiler('c') }}
host:
    - python
    - libcxx<16
    - boost 
    - elements ==6.1.2
    - cfitsio >=3.470
    - CCfits >=2.5
run:
    - {{ pin_compatible('python', min_pin='x.x', max_pin='x.x') }}
    - {{ pin_compatible('boost', min_pin='x.x', max_pin='x.x') }}
    - {{ pin_compatible('cfitsio', min_pin='x.x', max_pin='x.x') }}
    - {{ pin_compatible('CCfits', min_pin='x.x', max_pin='x.x') }}

`

in the pipeline runs for osx (linux is going smoothly) I got a list of package to be installed which contains

`

boost: 1.78.0-py39h6dc771e_4 conda-forge
boost-cpp: 1.78.0-h8b082ac_1 conda-forge
libcxx: 15.0.7-h71dddab_0 conda-forge
`

then after executing the transaction if specify again "The following NEW packages will be INSTALLED:" and this time appears:
libcxx: 16.0.0-h71dddab_0 conda-forge
and of course the build failed due to
#include <boost/program_options.hpp>

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I have tried to define _LIBCPP_ENABLE_CXX17_REMOVED_UNARY_BINARY

The build command is:
$BUILD_PREFIX/bin/x86_64-apple-darwin13.4.0-clang++ -DBOOST_FILESYSTEM_VERSION=3 -DELEMENTS_DEFAULT_LOGLEVEL=DEBUG -DNDEBUG -D_GNU_SOURCE -D_LIBCPP_ENABLE_CXX17_REMOVED_UNARY_BINARY -Df2cFortran -I$SRC_DIR/build/AlexandriaKernel -I$SRC_DIR/AlexandriaKernel -I$SRC_DIR/build/include -I$SRC_DIR -isystem /opt/local/include/llvm140/c++ -march=core2 -mtune=haswell -mssse3 -ftree-vectorize -fPIC -fPIE -fstack-protector-strong -O2 -pipe -stdlib=libc++ -fvisibility-inlines-hidden -fmessage-length=0 -isystem $PREFIX/include -fdebug-prefix-map=$SRC_DIR=/usr/local/src/conda/alexandria-2.28.4 -fdebug-prefix-map=$PREFIX=/usr/local/src/conda-prefix -std=c++17 -stdlib=libc++ -Wno-deprecated -Wno-overloaded-virtual -Wno-char-subscripts -Wno-unused-parameter -Qunused-arguments -O3 -DNDEBUG -isysroot /Applications/Xcode_13.2.1.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.9.sdk -mmacosx-version-min=10.9 -MD -MT AlexandriaKernel/CMakeFiles/AlexandriaVersion.dir/src/program/AlexandriaVersion.cpp.o -MF CMakeFiles/AlexandriaVersion.dir/src/program/AlexandriaVersion.cpp.o.d -o CMakeFiles/AlexandriaVersion.dir/src/program/AlexandriaVersion.cpp.o -c $SRC_DIR/AlexandriaKernel/src/program/AlexandriaVersion.cpp

but I got the same crash

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then after executing the transaction

Which transactions? Probably you also need to add "libcxx<16" there? Can you just link the feedstock?

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OK eventually I got it working: the key put in everywhere:

`requirements:

build:
    (...) 
    - libcxx<16
host:
    (...)
    - libcxx<16
run:
    (...)
    - {{ pin_compatible('libcxx', min_pin='x.x', max_pin='x.x') }}

`

from boost-cpp-feedstock.

I tought backporting the fix in 1.78.0, but from #130 it seems that due to ABI breakage we cannot backport stuff to 1.78.0 .

You can rebuild that branch without upgrading the compiler. Then we don't have to worry about ABI breakage.

Thanks, I did not tought of that, #135 does that.

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