[llvm-bugs] [Bug 24487] New: clang fails to compile linux "ALTERNATIVE" (integrated-as)

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https://llvm.org/bugs/show_bug.cgi?id=24487

            Bug ID: 24487
           Summary: clang fails to compile linux  "ALTERNATIVE"
                    (integrated-as)
           Product: clang
           Version: trunk
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P
         Component: -New Bugs
          Assignee: unassignedclangbugs at nondot.org
          Reporter: dl9pf at gmx.de
                CC: llvm-bugs at lists.llvm.org
    Classification: Unclassified

Created attachment 14738
  --> https://llvm.org/bugs/attachment.cgi?id=14738&action=edit
original .S

Clang does not compile the linux "ALTERNATIVE" construct on x86 when
integrated-as (on by default)  is used.

Environment: clang built from git HEAD, Linux 4.2-rc7+

Example error:
clang -Wp,-MD,arch/x86/entry/.entry_64.o.d  -nostdinc -isystem
/home/dl9pf/user/git/LF/llvmlinux/toolchain/clang/head/install/bin/../lib/clang/3.8.0/include
-I./arch/x86/include -Iarch/x86/include/generated/uapi
-Iarch/x86/include/generated  -Iinclude -I./arch/x86/include/uapi
-Iarch/x86/include/generated/uapi -I./include/uapi -Iinclude/generated/uapi
-include ./include/linux/kconfig.h -D__KERNEL__    -D__ASSEMBLY__    -m64
-DCONFIG_AS_FXSAVEQ=1 -DCONFIG_AS_SSSE3=1 -DCONFIG_AS_CRC32=1 -DCONFIG_AS_AVX=1
-DCONFIG_AS_AVX2=1          -c -o arch/x86/entry/entry_64.o
arch/x86/entry/entry_64.S             
<instantiation>:4:8: error: expected absolute expression
 .skip -(((144f-143f)-(141b-140b)) > 0) * ((144f-143f)-(141b-140b)),0x90
       ^
arch/x86/entry/entry_64.S:599:2: note: while in macro instantiation
 ALTERNATIVE "", ".byte 0x0f,0x01,0xca", ( 9*32+20)
 ^
<instantiation>:4:8: error: expected absolute expression
 .skip -(((144f-143f)-(141b-140b)) > 0) * ((144f-143f)-(141b-140b)),0x90
       ^
<instantiation>:2:2: note: while in macro instantiation
 ALTERNATIVE "", ".byte 0x0f,0x01,0xca", ( 9*32+20)
 ^
arch/x86/entry/entry_64.S:774:1: note: while in macro instantiation
apicinterrupt3 0x20 irq_move_cleanup_interrupt smp_irq_move_cleanup_interrupt
^
<instantiation>:4:8: error: expected absolute expression
 .skip -(((144f-143f)-(141b-140b)) > 0) * ((144f-143f)-(141b-140b)),0x90
       ^
<instantiation>:2:2: note: while in macro instantiation
 ALTERNATIVE "", ".byte 0x0f,0x01,0xca", ( 9*32+20)


The entry_64.S and preprocessed .i is attached. 

This blocks the meta-bug 4068.

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