t-crest / patmos-clang Goto Github PK

When compiling using clang directly to a singlepath executable, the use of the optimization flags O2 and O3 fails because the root functions are not found.
I.e. for a given main.c program, trying to compile using the command patmos-clang main.c -mpatmos-singlepath=some_root_sp_function -O2 will result in the error:

Following single-path roots were not found:
'some_root_sp_function'
LLVM ERROR: Single-path code generation failed due to missing single-path entry functions!
patmos-clang-3.4: error: link  via llvm-link, opt and llc command failed with exit code 1 (use -v to see invocation)

Manually managing the compile steps does not throw this error. I.e. we can first compile to bitcode using patmos-clang -S main.c -O2 -o main.s, and then use patmos-llc main.s -mpatmos-singlepath=some_root_sp_function -O2 to compile the rest of the way.

The TACLe-style loopbound pragma (#pragma loopbound min NUM max NUM) should allow macros for NUM constants. Unfortunately, this macro expansion does not work when only preprocessing with -E. Hence, compilation also fails when -save-temps is specified as command line option.