latest update to BigSur 11.1 broke gcc

[Andreas Skarlatoudis]

Hello all, 

I’m working on a MBP, 2018 model and yesterday I updated to the latest version of BigSur. Since then I cannot compile any fortran code and the error I get is 

ld: library not found for -lSystem
collect2: error: ld returned 1 exit status


I have tried both gcc9 and gcc10

gfortran -v gives this output :

Using built-in specs.
COLLECT_GCC=gfortran
COLLECT_LTO_WRAPPER=/opt/local/libexec/gcc/x86_64-apple-darwin20/10.2.0/lto-wrapper
Target: x86_64-apple-darwin20
Configured with: /opt/local/var/macports/build/_opt_bblocal_var_buildworker_ports_build_ports_lang_gcc10/gcc10/work/gcc-10.2.0/configure --prefix=/opt/local --build=x86_64-apple-darwin20 --enable-languages=c,c++,objc,obj-c++,lto,fortran,jit --libdir=/opt/local/lib/gcc10 --includedir=/opt/local/include/gcc10 --infodir=/opt/local/share/info --mandir=/opt/local/share/man --datarootdir=/opt/local/share/gcc-10 --with-local-prefix=/opt/local --with-system-zlib --disable-nls --program-suffix=-mp-10 --with-gxx-include-dir=/opt/local/include/gcc10/c++/ --with-gmp=/opt/local --with-mpfr=/opt/local --with-mpc=/opt/local --with-isl=/opt/local --enable-stage1-checking --disable-multilib --enable-lto --enable-libstdcxx-time --with-build-config=bootstrap-debug --with-as=/opt/local/bin/as --with-ld=/opt/local/bin/ld --with-ar=/opt/local/bin/ar --with-bugurl=https://trac.macports.org/newticket <https://trac.macports.org/newticket> --enable-host-shared --disable-tls --with-pkgversion='MacPorts gcc10 10.2.0_4' --with-sysroot=/Library/Developer/CommandLineTools/SDKs/MacOSX11.0.sdk
Thread model: posix
Supported LTO compression algorithms: zlib
gcc version 10.2.0 (MacPorts gcc10 10.2.0_4) 

I’ve removed and reinstalled MacPorts and all packages but it didn’t help.

Any ideas what may be the problem here? 

Thanks in advance for your help

Andreas 

Dr. Seismologist

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