[MacPorts] BigSurProblems modified

[MacPorts Wiki]

Page "BigSurProblems" was changed by jmroot
Diff URL: <https://trac.macports.org/wiki/BigSurProblems?action=diff&version=4>
Revision 4
Comment: note Rosetta 2 arch pitfalls
Changes:
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Index: BigSurProblems
=========================================================================
--- BigSurProblems (version: 3)
+++ BigSurProblems (version: 4)
@@ -18,6 +18,10 @@
 
 Symptoms that your system requires manual installation: console message about missing SDK (`Warning: The macOS 11.x SDK does not appear to be installed. Ports may not build correctly. Warning: You can install it as part of the Xcode Command Line Tools package by running `xcode-select --install'.`) or a message about C compiler being unable to create executables in build logs. 
 
+== Rosetta 2 and build_arch ==
+
+MacPorts defaults to building for the architecture that it is running as. If you have a universal MacPorts installation on an Apple Silicon Mac, and you run it from a terminal emulator that is not a native arm64 binary, MacPorts will end up being run as x86_64, and will build ports accordingly, which is often unexpected. This can be corrected by explicitly setting `build_arch arm64` in macports.conf, or by using a native terminal emulator.
+
 == Tickets for Broken Ports ==
 
 [[TicketQuery(component=ports&status!=closed&keywords~=bigsur,or,component=ports&status!=closed&keywords~=11.0)]]
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