[LLVMbugs] [Bug 2267] New: llvm-gcc no longer accepts some assembly: Invalid or unsupported inline assembly!

[bugzilla-daemon at cs.uiuc.edu]

http://llvm.org/bugs/show_bug.cgi?id=2267

           Summary: llvm-gcc no longer accepts some assembly: Invalid or
                    unsupported inline assembly!
           Product: new-bugs
           Version: unspecified
          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


I tried to build glibc with llvm-gcc4.2, and I get lots of there errors:

abort.c: In function ‘abort’:
abort.c:86: error: Invalid or unsupported inline assembly!

This errors is shown many times, I picked the error from abort.c:

$ grep "unsupported inline assembly" ../../i386-libc/log|wc -l
1043

The reduced testcase shows it is a libc asm low-level lock function that is not
accepted by llvm-gcc. A while ago (I don't remember which revision) I was able
to compile glibc without these errors.

To reproduce:
$ gcc testcase-min.i -fsyntax-only
$ llvm-gcc testcase-min.i -fsyntax-only
testcase-min.i: In function ‘abort’:
testcase-min.i:10: error: Invalid or unsupported inline assembly!

$ uname -a
Linux thunder 2.6.25-rc6-00268-gd2532dd-dirty #23 SMP PREEMPT Sun Mar 23
18:34:55 EET 2008 i686 GNU/Linux

testcase-min.i:
typedef struct {
              int lock;
              int cnt;
              }
                   __libc_lock_recursive_t;
                   static int stage;
                   static __libc_lock_recursive_t lock;
                   void abort (void) {
                if (stage == 2)     {
                 do {        if (--(lock).cnt == 0) {      (void) ({    int
ignore;    if (__builtin_constant_p (0) && (0) == 0) __asm __volatile ("cmpl
$0, %%gs:%P3\n\t" "je 0f\n\t" "lock\n" "0:\tsubl $1,%0\n\t" "jne
_L_unlock_%=\n\t" ".subsection 1\n\t" ".type _L_unlock_%=, at function\n"
"_L_unlock_%=:\n" "1:\tleal %0, %%eax\n" "2:\tcall __lll_unlock_wake_private\n"
"3:\tjmp 18f\n" "4:\t.size _L_unlock_%=, 4b-1b\n\t" ".previous\n" ".section   
.eh_frame,\"a\", at progbits\n" "5:\t" ".long      7f-6f   # Length of Common
Information Entry\n" "6:\t" ".long   0x0     # CIE Identifier Tag\n\t" ".byte  
     0x1     # CIE Version\n\t" ".ascii \"zR\\0\"    # CIE Augmentation\n\t"
".uleb128 0x1   # CIE Code Alignment Factor\n\t" ".sleb128 -4   # CIE Data
Alignment Factor\n\t" ".byte 0x8     # CIE RA Column\n\t" ".uleb128 0x1      #
Augmentation size\n\t" ".byte 0x1b    # FDE Encoding (pcrel sdata4)\n\t" ".byte
      0xc     # DW_CFA_def_cfa\n\t" ".uleb128 0x4\n\t" ".uleb128 0x0\n\t"
".align 4\n" "7:\t" ".long  17f-8f  # FDE Length\n" "8:\t" ".long   8b-5b   #
FDE CIE offset\n\t" ".long    1b-.# FDE initial location\n\t" ".long  4b-1b   #
FDE address range\n\t" ".uleb128 0x0  # Augmentation size\n\t" ".byte 0x16    #
DW_CFA_val_expression\n\t" ".uleb128 0x8\n\t" ".uleb128 10f-9f\n" "9:\t" ".byte
      0x78    # DW_OP_breg8\n\t" ".sleb128 3b-1b\n" "10:\t" ".byte    0x40 +
(2b-1b) # DW_CFA_advance_loc\n\t" ".byte 0x16    # DW_CFA_val_expression\n\t"
".uleb128 0x8\n\t" ".uleb128 12f-11f\n" "11:\t" ".byte     0x78    #
DW_OP_breg8\n\t" ".sleb128 3b-2b\n" "12:\t" ".byte    0x40 + (3b-2b-1) #
DW_CFA_advance_loc\n\t" ".byte       0x16    # DW_CFA_val_expression\n\t"
".uleb128 0x8\n\t" ".uleb128 16f-13f\n" "13:\t" ".byte     0x78    #
DW_OP_breg8\n\t" ".sleb128 15f-14f\n\t" ".byte        0x0d    #
DW_OP_const4s\n" "14:\t" ".4byte      3b-.\n\t" ".byte        0x1c    #
DW_OP_minus\n\t" ".byte       0x0d    # DW_OP_const4s\n" "15:\t" ".4byte     
18f-.\n\t" ".byte       0x22    # DW_OP_plus\n" "16:\t" ".align 4\n" "17:\t"
".previous\n" "18:" : "=m" ((lock).lock), "=&a" (ignore) : "m" ((lock).lock),
"i" (12) : "memory");    }     );      }        }
           while (0);
               }
                while (1)     asm ("hlt");
              }


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