Example for compiling as1:
1. g++ recomp.cpp -o recomp -g -lcapstone
2. ./recomp ~/ido7.1_compiler/usr/lib/as1 > as1_c.c
3. gcc libc_impl.c as1_c.c -o as1 -g -fno-strict-aliasing -lm -no-pie -DIDO71
Use the same approach for cc, cfe, uopt, ugen, as1 (and copt if you need that).
Use -DIDO53 instead of -DIDO71 if the program you are trying to recompile was compiled with IDO 5.3 rather than IDO 7.1.
You can add -O2 to step 3. To compile ugen for IDO 5.3, add -Dugen53 to step 1, which makes it more conservative due to ugen53 reads uninitialized stack memory and the result depends on that.