On 12/20/24 10:04, Ivan Krylov via R-package-devel wrote:
В Fri, 20 Dec 2024 11:30:04 +0300
Ivan Krylov via R-package-devel <r-package-devel@r-project.org> пишет:
Unfortunately, it's still a puzzle why the function
tesseract::TessBaseAPI::GetVariableAsString(char const*, std::string*)
const fails to load from libtesseract.
That's because libtesseract.so is linked to a different C++ standard
library. Compare:
undefined symbol:
_ZNK9tesseract11TessBaseAPI19GetVariableAsStringEPKcPNSt3__112basic_stringIcNS3_11char_traitsIcEENS3_9allocatorIcEEEE
c++filt says it's:
tesseract::TessBaseAPI::GetVariableAsString(char const*, std::__1::basic_string<char,
std::__1::char_traits<char>, std::__1::allocator<char> >*) const
The symbol actually exported by libtesseract.so is named differently:
$ nm -gDP /usr/lib/x86_64-linux-gnu/libtesseract.so.5 | grep GetVariableAsString
_ZNK9tesseract11TessBaseAPI19GetVariableAsStringEPKcPNSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEEE
T a4f40 16
c++filt says:
tesseract::TessBaseAPI::GetVariableAsString(char const*, std::__cxx11::basic_string<char,
std::char_traits<char>, std::allocator<char> >*) const
What should a package do when it's compiled by clang++ with the libc++
headers and library, but all system dependencies had been compiled with
g++ and linked with libstdc++? How to check packages using the clang
compiler without compiling the rest of the system from source using
clang? How do other C++ packages solve this problem?
It would say it is the responsibility of the check system/machine that
the toolchain and the libraries used to build R packages are compatible,
so also use the same C++ library. There is nothing R packages should do
about this. R packages only need to make sure their code is portable and
that they do not download any pre-compiled code.
Tomas
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