you are right probably some gcc / clang mix was there, now i recompiled boost with gcc-11 and the linking errors are gone but now i get errors at runtime.

./bootstrap.sh --prefix=/usr/local/boost-1.76.0_gcc-11_libs
In project-config.jam:
#if ! clang in [ feature.values <toolset> ]
#    using clang ; 

#project : default-build <toolset>clang ;

using gcc : 11.1.0 : /usr/local/Cellar/gcc/11.1.0_1/bin/g++-11 ;

and then:
sudo ./b2 cxxflags=-std=gnu++20 install
export DYLD_LIBRARY_PATH=/usr/local/boost-1.76.0_gcc-11_libs/lib:$DYLD_LIBRARY_PATH
and at runtime I get:
dyld: Symbol not found: __ZN5boost15program_options3argB5cxx11E
  Referenced from: /Users/stegra/Projects/VSCode/BoostCookbook/./Chapter01/01_A_program_options_base/main
  Expected in: /usr/local/lib/libboost_program_options.dylib
 in /Users/stegra/Projects/VSCode/BoostCookbook/./Chapter01/01_A_program_options_base/main
Il giorno 24 lug 2021, alle ore 12:33, John Maddock via Boost-users <boost-users@lists.boost.org> ha scritto:

On 23/07/2021 07:57, Stefano Gragnani via Boost-users wrote:
The development system is:
MacBook Pro Intel i9
MacOS  Big Sur 11.4
gcc version 11.1.0 (Homebrew GCC 11.1.0_1)
clang version 12.0.0

I'm having trouble compiling some examples from the book 'Boost C ++ Application Development Cookbook’.
The problem occurs *only* *with g ++,* *with clang there is no error.*
Mistakes only occur when linking to -lboost_program_options, -lboost_system and -lboost_filesystem, with any other library (eg -lboost_chrono) everything is fine.

Did you compile the libraries with g++ or are they clang compiled?  I would expect that mixing the 2 would cause issues.

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