gcc10 compiler not working

[smeingast (Stefan Meingast)]

Hey guys, my apologies, but I am lost. After reinstalling my complete MacPorts installation, I found that gcc does not work anymore.

I get this error:

/opt/local/lib/gcc10/gcc/x86_64-apple-darwin20/10.2.0/include-fixed/stdio.h:78:10: fatal error: _stdio.h: No such file or directory
   78 | #include <_stdio.h>
      |          ^~~~~~~~~~
compilation terminated.

I already know that this is usually a problem with Xcode, but none of the solutions I found online worked (and the command line tools are definitely installed). Any help would be greatly appreciated! :/

[michaellass (Michael Lass)]

You likely have the XCode SDK installed in version 11.1 and the gcc10 port has been built with the 11.0 SDK. Then gcc expects the headers at the wrong location. See comment:ticket:61899:4

Try compiling with the following flag:

-isysroot/Library/Developer/CommandLineTools/SDKs/MacOSX11.1.sdk

If that works, a proper fix for now is to recompile gcc10 yourself: port upgrade -s -n --force gcc10

[kencu (Ken)]

see <​https://lists.macports.org/pipermail/macports-dev/2020-December/042769.html> for discussion about this issue...

[smeingast (Stefan Meingast)]

Replying to michaellass:

You likely have the XCode SDK installed in version 11.1 and the gcc10 port has been built with the 11.0 SDK. Then gcc expects the headers at the wrong location. See comment:ticket:61899:4

Try compiling with the following flag:

-isysroot/Library/Developer/CommandLineTools/SDKs/MacOSX11.1.sdk

If that works, a proper fix for now is to recompile gcc10 yourself: port upgrade -s -n --force gcc10

Yes! Thats works, many thanks! And it seems you guys already have this on your radar at a more global scale. 😊 Thanks for the quick help!

[kencu (Ken)]

[e8866c5019d60832527850b4e50fdc1de8878716/macports-ports]