http://llvm.org/bugs/show_bug.cgi?id=20044
Bug ID: 20044
Summary: Libcall simplification in -ffreestanding
Product: clang
Version: unspecified
Hardware: PC
OS: Linux
Status: NEW
Severity: normal
Priority: P
Component: -New Bugs
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected]
Classification: Unclassified
Currently, clang disables libcall simplification entirely when called with
-ffreestanding, as is expected. clang also disables libcall simplification if
-fbuiltin is also given on the command line, contrary to what gcc does.
I fully agree with the default behaviour (-ffreestanding implies -fno-builtin),
but I also want to disable it in some circumstances. In freestanding mode,
folding memcpy and friends instead of generating calls is just as useful as in
hosted mode (except in the definition of those, of course). Allowing -fbuiltin
to enable libcall simplification on freestanding would be one way to do that,
or a new function attribute (I'd prefer that), or maybe something else
entirely.
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