[LLVMbugs] [Bug 4898] New: llvm-gcc: fails to link ARCH= um Linux kernel undefined reference to `__bad_size'

[bugzilla-daemon at cs.uiuc.edu]

http://llvm.org/bugs/show_bug.cgi?id=4898

           Summary: llvm-gcc:  fails to link ARCH=um Linux kernel undefined
                    reference to `__bad_size'
           Product: new-bugs
           Version: 2.6
          Platform: PC
        OS/Version: Linux
            Status: NEW
          Severity: normal
          Priority: P2
         Component: new bugs
        AssignedTo: unassignedbugs at nondot.org
        ReportedBy: edwintorok at gmail.com
                CC: llvmbugs at cs.uiuc.edu


$ make CC=llvm-gcc HOSTCC=llvm-gcc ARCH=um defconfig
$ make CC=llvm-gcc HOSTCC=llvm-gcc ARCH=um
mm/built-in.o: In function `kmem_cache_init':
/home/edwin/builds/linux-2.6/mm/slab.c:343: undefined reference to `__bad_size'
/home/edwin/builds/linux-2.6/mm/slab.c:343: undefined reference to `__bad_size'
/home/edwin/builds/linux-2.6/mm/slab.c:343: undefined reference to `__bad_size'
/home/edwin/builds/linux-2.6/mm/slab.c:1461: undefined reference to
`__bad_size'
/home/edwin/builds/linux-2.6/mm/slab.c:1461: undefined reference to
`__bad_size'
mm/built-in.o:/home/edwin/builds/linux-2.6/mm/slab.c:1517: more undefined
references to `__bad_size' follow
collect2: ld returned 1 exit status

This is usually due to not inlining something the kernel expected to inline,
thus __builtin_constant_p() returning false.

Will try to attach a testcase.


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