http://llvm.org/bugs/show_bug.cgi?id=3606
Summary: undefined symbol with -O2
Product: clang
Version: unspecified
Platform: PC
OS/Version: FreeBSD
Status: NEW
Severity: normal
Priority: P2
Component: LLVM Codegen
AssignedTo: [email protected]
ReportedBy: [email protected]
CC: [email protected]
hi.. I am getting this:
witten /tmp# ccc -c -O0 acpi_wakeup.c
ccc: Unknown host 'freebsd', using generic host information.
witten /tmp# nm acpi_wakeup.o | grep r_ds
00000030 b r_ds
witten /tmp# ccc -c -O1 acpi_wakeup.c
ccc: Unknown host 'freebsd', using generic host information.
witten /tmp# nm acpi_wakeup.o | grep r_ds
U r_ds
witten /tmp#
when the optimization is turned on the symbol is optimized out, this is most
likely llvm bug.
test case attached
this prevents i386 freebsd kernel from linking
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