[PATCH] D56950: [docs] Prevent O0 optnone for opt input

[Shoaib Meenai via Phabricator via llvm-commits]

smeenai created this revision.
smeenai added reviewers: chandlerc, dblaikie.

If we just compile with -O0, clang will add optnone attributes
everywhere, so opt won't actually be able to perform any passes.
Instruct clang to not emit the optnone so opt can do its thing.


https://reviews.llvm.org/D56950

Files:
  llvm/docs/HowToSubmitABug.rst


Index: llvm/docs/HowToSubmitABug.rst
===================================================================
--- llvm/docs/HowToSubmitABug.rst
+++ llvm/docs/HowToSubmitABug.rst
@@ -84,7 +84,7 @@
 ------------------------------
 
 If you find that a bug crashes in the optimizer, compile your test-case to a
-``.bc`` file by passing "``-emit-llvm -O0 -c -o foo.bc``".
+``.bc`` file by passing "``-emit-llvm -O0 -Xclang -disable-O0-optnone -c -o foo.bc``".
 Then run:
 
 .. code-block:: bash


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