gcc10 @10.2.0 build failure

[neuronphysics]

I installed Big Sur on my macos laptop and now I can not compile and build my make file for my c++ code. I am following all the instructions in the internet and I decided to install gcc10 using port. Half way through the installation, I got the following error messages:

sudo port -v -s install gcc1/opt/local/var/macports/build/_opt_local_var_macports_sources_rsync.macports.org_macports_release_tarballs_ports_lang_gcc10/gcc10/work/gcc-10.2.0/gcc/rtl.h:1229:38: note: expanded from macro 'RTL_CHECK2'
#define RTL_CHECK2(RTX, N, C1, C2)  ((RTX)->u.fld[N])
                                     ^            ~
/opt/local/var/macports/build/_opt_local_var_macports_sources_rsync.macports.org_macports_release_tarballs_ports_lang_gcc10/gcc10/work/gcc-10.2.0/gcc/rtl.h:444:5: note: array 'fld' declared here
    rtunion fld[1];
    ^
/opt/local/var/macports/build/_opt_local_var_macports_sources_rsync.macports.org_macports_release_tarballs_ports_lang_gcc10/gcc10/work/gcc-10.2.0/gcc/config/i386/i386.md:1230:25: warning: array index 1 is past the end of the array (which contains 1 element) [-Warray-bounds]
                  x11 = XEXP (x10, 1);
                        ^          ~
/opt/local/var/macports/build/_opt_local_var_macports_sources_rsync.macports.org_macports_release_tarballs_ports_lang_gcc10/gcc10/work/gcc-10.2.0/gcc/rtl.h:1341:23: note: expanded from macro 'XEXP'
#define XEXP(RTX, N)    (RTL_CHECK2 (RTX, N, 'e', 'u').rt_rtx)
                         ^                ~
/opt/local/var/macports/build/_opt_local_var_macports_sources_rsync.macports.org_macports_release_tarballs_ports_lang_gcc10/gcc10/work/gcc-10.2.0/gcc/rtl.h:1229:38: note: expanded from macro 'RTL_CHECK2'
#define RTL_CHECK2(RTX, N, C1, C2)  ((RTX)->u.fld[N])
                                     ^            ~
/opt/local/var/macports/build/_opt_local_var_macports_sources_rsync.macports.org_macports_release_tarballs_ports_lang_gcc10/gcc10/work/gcc-10.2.0/gcc/rtl.h:444:5: note: array 'fld' declared here
    rtunion fld[1];
    ^
3606 warnings generated.
/bin/sh /opt/local/var/macports/build/_opt_local_var_macports_sources_rsync.macports.org_macports_release_tarballs_ports_lang_gcc10/gcc10/work/gcc-10.2.0/gcc/../move-if-change tmp-automata.c insn-automata.c
echo timestamp > s-automata
make[3]: Leaving directory `/opt/local/var/macports/build/_opt_local_var_macports_sources_rsync.macports.org_macports_release_tarballs_ports_lang_gcc10/gcc10/work/build/gcc'
make[2]: *** [all-stage1-gcc] Error 2
make[2]: Leaving directory `/opt/local/var/macports/build/_opt_local_var_macports_sources_rsync.macports.org_macports_release_tarballs_ports_lang_gcc10/gcc10/work/build'
make[1]: *** [stage1-bubble] Error 2
make[1]: Leaving directory `/opt/local/var/macports/build/_opt_local_var_macports_sources_rsync.macports.org_macports_release_tarballs_ports_lang_gcc10/gcc10/work/build'
make: *** [bootstrap-lean] Error 2
make: Leaving directory `/opt/local/var/macports/build/_opt_local_var_macports_sources_rsync.macports.org_macports_release_tarballs_ports_lang_gcc10/gcc10/work/build'
Command failed:  cd "/opt/local/var/macports/build/_opt_local_var_macports_sources_rsync.macports.org_macports_release_tarballs_ports_lang_gcc10/gcc10/work/build" && /usr/bin/make -j12 -w bootstrap-lean 
Exit code: 2
Error: Failed to build gcc10: command execution failed
Error: See /opt/local/var/macports/logs/_opt_local_var_macports_sources_rsync.macports.org_macports_release_tarballs_ports_lang_gcc10/gcc10/main.log for details.
Error: Follow https://guide.macports.org/#project.tickets to report a bug.
Error: Processing of port gcc10 failed

How can I download gcc10 on my laptop? thanks

[ryandesign (Ryan Carsten Schmidt)]

Please attach the main.log file so that we can see what went wrong.

Are you sure you need g++? Normally on macOS you would compile C++ code using c++, which is clang++, and if you got this far with MacPorts then you already have it installed.

[kencu (Ken)]

Please reopen with a log if you find this to be a repeatable error.