Unable to build boost_stacktrace_addr2line with non system-default libstdc++.so

[rklepov]

I'm building boost libraries v1.88.0 with clang20 and libstdc++ supplied with gcc 15.1 both of which are installed at custom paths. Both PATH and LD_LIBRARY_PATH are configured accordingly (LD_LIBRARY_PATH is particularly important for this matter as you'll see shortly).

$ clang -v
clang version 20.1.8
Target: x86_64-unknown-linux-gnu
Thread model: posix
InstalledDir: /data/local/llvm/20.1.8/bin
Found candidate GCC installation: /data/local/gnu/gcc/15.1.0/lib/gcc/x86_64-pc-linux-gnu/15.1.0
Selected GCC installation: /data/local/gnu/gcc/15.1.0/lib/gcc/x86_64-pc-linux-gnu/15.1.0
Candidate multilib: .;@m64
Selected multilib: .;@m64

While both --with-stacktrace and -DBOOST_STACKTRACE_ADDR2LINE_LOCATION=/usr/bin/addr2line" options are supplied and /usr/bin/addr2line executable is available and working, the configuration checks refuse to build boost.stacktrace.addr2line:

    - boost.stacktrace.addr2line : no [2]
    - boost.stacktrace.addr2line : no [4]
    - boost.stacktrace.backtrace : yes [2]
    - boost.stacktrace.basic   : no [2]
    - boost.stacktrace.from_exception : yes
    - boost.stacktrace.from_exception : yes

Looking through config.log shows that, while addr2line_exe executable is successfully built from has_addr2line.cpp source, but running it with a modified LD_LIBRARY_PATH fails:

LD_LIBRARY_PATH=<path to libbacktrace> [build dir]/boost/bin.v2/libs/stacktrace/build/clng-lnx-20/dbg/x86_6/cxstd-14-iso/lnk-sttc/nm-on/thrd-mlt/vsblt-hdn/addr2line_exe > [build dir]/boost/bin.v2/libs/stacktrace/build/clng-lnx-20/dbg/x86_6/cxstd-14-iso/lnk-sttc/nm-on/thrd-mlt/vsblt-hdn/addr2line.output

[build dir]/boost/bin.v2/libs/stacktrace/build/clng-lnx-20/dbg/x86_6/cxstd-14-iso/lnk-sttc/nm-on/thrd-mlt/vsblt-hdn/addr2line_exe:
/lib64/libstdc++.so.6: version `GLIBCXX_3.4.29' not found (required by [build dir]/boost/bin.v2/libs/stacktrace/build/clng-lnx-20/dbg/x86_6/cxstd-14-iso/lnk-sttc/nm-on/thrd-mlt/vsblt-hdn/addr2line_exe)

...failed Jamfile<[source dir]/libs/stacktrace/build>.mp_simple_run_action [build dir]/boost/bin.v2/libs/stacktrace/build/clng-lnx-20/dbg/x86_6/cxstd-14-iso/lnk-sttc/nm-on/thrd-mlt/vsblt-hdn/addr2line.output...

* I've abbreviated my local paths in the log excerpt above because I build boost as a conan package so the actual paths are rather long and cryptic.

So the problem is that setting LD_LIBRARY_PATH environment variable to a path to libbacktrace for addr2line_exe run overwrites other custom paths there. Therefore the version of libstdc++.so.6 that is picked up is not the one against which addr2line_exe executable was built.

This is particularly important in the case of conan build. The point is that it eventually fails because the build options suggest that boost_stacktrace_addr2line should be built but the binary is not there.

ConanException: These libraries were expected to be built, but were not built: {'boost_stacktrace_addr2line'}

To be honest from what I see in has_addr2line.cpp it doesn't seem that the dependency on C++ standard library (std::string) is essential. So arguably the easiest way to fix the issue would be just to get rid of it.