[llvm-bugs] [Bug 31787] New: Incorrect warning about uninitialized variable with `asm`

[via llvm-bugs]

https://llvm.org/bugs/show_bug.cgi?id=31787

            Bug ID: 31787
           Summary: Incorrect warning about uninitialized variable with
                    `asm`
           Product: clang
           Version: 4.0
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P
         Component: -New Bugs
          Assignee: unassignedclangbugs at nondot.org
          Reporter: paulepanter at users.sourceforge.net
                CC: llvm-bugs at lists.llvm.org
    Classification: Unclassified

Clang 4.0.0-+rc1 shows a warning, which is – as far as I can see – incorrect.

```
$ clang-4.0 --version
clang version 4.0.0-+rc1-1 (tags/RELEASE_400/rc1)
Target: i686-pc-linux-gnu
Thread model: posix
InstalledDir: /usr/bin
$ git clone https://review.coreboot.org/memtest86plus
$ cd memtest86plus
$ clang-4.0 -c -Wall -march=i486 -m32 -O0 -fomit-frame-pointer -fno-builtin
-ffreestanding -fPIC  -fno-stack-protector -fgnu89-inline -fno-strict-aliasing
reloc.c
reloc.c:55:10: warning: variable 'got' is uninitialized when used here
[-Wuninitialized]
        return *got;
                ^~~
reloc.c:54:26: note: initialize the variable 'got' to silence this warning
        register Elf32_Addr *got asm ("%ebx");
                                ^
                                 = NULL
1 warning generated.
```

GCC 6.3.0 doesn’t show that warning.

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