http://llvm.org/bugs/show_bug.cgi?id=9457
Summary: clang's missing -ffixed-REG, -fcall-used-REG,
-fcall-saved-REG
Product: clang
Version: trunk
Platform: PC
OS/Version: Linux
Status: NEW
Severity: normal
Priority: P
Component: -New Bugs
AssignedTo: [email protected]
ReportedBy: [email protected]
CC: [email protected], [email protected]
Blocks: 4068
in particular, -fcall-saved-REG is used by linux on x86 (i.e., both i386 and
amd64) for an optimized ABI for a few specific functions. since clang ignores
this switch (for completeness, i added the other two related switches too) the
generated machine code is not correct and results in runtime failure. the
workaround on the linux side is to disable CONFIG_ARCH_HWEIGHT_CFLAGS for now.
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