Thanks for the info, @cocobean , @MichaelPeppers , and @Begasus !
I also Google’d with ‘haiku gcc2 gcc4’ and found the following threads:
in addition to
My understanding is
$secondaryArchSuffixis for a hybrid system on which cross(?)-compiling forx86_gcc2(32-bit, for compatibility with BeOS?) andx86(32-bit GCC4?) is enabled, to distinguish what a binary/library is for.