http://llvm.org/bugs/show_bug.cgi?id=21471
Bug ID: 21471
Summary: Encoded compilation options in bitcode file
Product: libraries
Version: trunk
Hardware: PC
OS: All
Status: NEW
Severity: normal
Priority: P
Component: Common Code Generator Code
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected]
Classification: Unclassified
Many command-line options specified when compiling individual translation units
are ignored in the context of LTO. In particular, we don't properly encode all
options in the bitcode, and those that we do often aren't respected by CodeGen
and IR passes.
Eric is currently restructuring the LLVM backend to support per-function
subtarget info, which gets us most of the way there.
However, many options are sent to the backend as global flags (via -mllvm or
-backend-option) instead of as function attributes. Also, some function
attributes are duplicated via other mechanisms, so I suspect not all the
attributes are actually respected.
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