CMAKE build fails on M2 Mac but works on Intel Mac, "Undefined symbols for architecture x86_64"

[philburk]

REPRO STEPS

On an M2 Macbook:
git clone https://github.com/PortAudio/portaudio.git
mkdir pabuild
cd pabuild
cmake ../portaudio  -DPA_BUILD_EXAMPLES=ON
make

EXPECTED
Build succeeds.

ACTUAL

ld: warning: ignoring file '../libportaudio.a[3](pa_converters.c.o)': found architecture 'arm64', required architecture 'x86_64'
ld: warning: ignoring file '../libportaudio.a[2](pa_allocation.c.o)': found architecture 'arm64', required architecture 'x86_64'
Undefined symbols for architecture x86_64:
  "_main", referenced from:
      <initial-undefines>
ld: symbol(s) not found for architecture x86_64

The same instructions work on my Intel mac.

[ryandesign]

Unable to reproduce on an M1 Mac mini running macOS 13. Try deleting your pabuild directory and trying again; maybe it contains remnants of a previous x86_64 build attempt. Make sure you are using an arm64 terminal program and arm64 shell, not one running in x86_64 emulation via Rosetta 2.