From what I have gathered, to use opt to run a compiler pass on an .ll file, I can load a plugin first, and then run the pass using the plugin:
opt -load=./myPass.so -help
opt -myPass myProgram.ll -o myOptimizedProgram.ll
However, when I run the first command, the newly loaded plugin does not show up in the -help output. Opt doesn't print any error message, so I'm not sure how to start to look for a reason why.
If anyone can suggest a way to begin to track down a reason for this error (eg, is there any way to make opt print out any usable error message), I would greatly appreciate that as well.
I have seen the following solutions, which did not work for me:
LLVM OPT not giving optimised file as output.
Using LLVM opt with built-in passes
It also might be helpful to know that, when I try to run the pass using clang like so:
clang++ -Xclang -load -Xclang ./myPass.so myProgram.ll -o myOptimizedProgram.ll
it prints out an error message just fine.
*Edited some misused words.
