On Sat, Jun 12, 2021 at 3:39 AM Kazuyoshi Furutaka via Gcc-help < gcc-help@xxxxxxxxxxx> wrote: > > cc1plus shouldn't link to libstdc++.so. Instead it links to static > > library libstdc++.a (at least by default). > But it does link with system libraries, and one of them could in turn have been linked with the system libstdc++ which is newer than the one you are building. So you need to find what system library linked into cc1plus requires the system libstdc++. You should be able to do that with the ldd program, e.g. "ldd cc1plus" will show you what libraries are linked in, then run ldd on each library those use recursively, until you find the one that needs the newer libstdc++. Then, depending on exactly which library that is, either you add a configure option to avoid using it, or you add the sources into the gcc build tree to build your own version of it, or you manually build a version of it that you can use with an older gcc. Possible libraries to look at are gmp, mpc, mpfr, isl, z, m, c, dl. There could be others depending on what configure options you used. Jim
