depends: native_capnp picks system gcc, not CC/CXX #33859

1. 
   maflcko commented at 10:37 am on November 12, 2025: member

   native_capnp seems to ignore the CC/CXX settings. This leads to compile failures on distros that come with an older GCC, such as RHEL-based Linux 8, or the latest OpenSuse Leap:

    0# ( cd depends && make CC=clang CXX=clang++  -j $(nproc) )
    1
    2Configuring native_capnp...
    3-- The CXX compiler identification is GNU 7.5.0
    4-- Detecting CXX compiler ABI info
    5-- Detecting CXX compiler ABI info - failed
    6-- Check for working CXX compiler: /usr/bin/g++
    7-- Check for working CXX compiler: /usr/bin/g++ - broken
    8CMake Error at /usr/share/cmake/Modules/CMakeTestCXXCompiler.cmake:60 (message):
    9  The C++ compiler
   10
   11    "/usr/bin/g++"
   

2. maflcko added the label Build system on Nov 12, 2025
3. 
   hebasto commented at 10:53 am on November 12, 2025: member

   Native compilers are managed by the build_CC and build_CXX variables, no?
4. 
   maflcko commented at 11:09 am on November 12, 2025: member

   thx, i guess some docs about those settings could help. Otherwise, users will have to read the source code.

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