https://gcc.gnu.org/bugzilla/show_bug.cgi?id=90330
--- Comment #11 from Iain Sandoe <iains at gcc dot gnu.org> --- (In reply to Matt Thompson from comment #10) > (In reply to Iain Sandoe from comment #9) > > (In reply to Matt Thompson from comment #8) > I don't usually remove it from my path because it had never caused any > issues before. Note that I specifically do not let brew install gcc (or > MPI). I like that control. I'm currently running a "no /usr/local/bin" test > so we shall see if it helps. OK - let's be clear here. You must install GCC into the path that its configured with in order for the correct shared libraries to be found at runtime. so, if yo configure --prefix=/foo/bar/baz and then intstall into /baz/bar/foo that will not work correctly. The error you are showing seems that you are not finding the same libstdc++ at runtime as was assumed to be available by the build. > > If you can find the exact command line that fails and repeat it, prepended > > by DYLD_PRINT_LIBRARIES=1, that will show you which dylibs are loaded as the > > command tries to execute (there might be quite a lot of output, so not > > necessarily easy to interpret) > > I just tried this and nothing happens. I tried both "DYLD_PRINT_LIBRARIES=1 > g++ ..." and "env DYLD_PRINT_LIBRARIES=1 g++ ..." No change in output. "which g++" probably says you are using clang++ and that it a protected exe that will elide DYLD_* when invoked. In that case, it's hard to do that test. > > > > > I have built > > > gcc 8.2.0. Instead of using clang, I could try that...though I'm not sure > > > how. Just pass in CC and CXX to configure? > > > > yes, and/or make sure that the GCC toolchain bin dir is before the system > > ones in your path. > > I'll try this as well as soon as I can (I can maybe manage make -j4 on this > laptop, so builds aren't quick!). Do I need to pass FC as well? Or does the > gcc build with fortran not care? Fortran is built with the C++ compiler, but I'd put the GCC bin dir in the path first - and then you will be able to do the DYLD_** commands using the bootstrap compiler tools to install.
