[llvm-bugs] [Bug 29003] New: Wrong .file directive generated by -S

[via llvm-bugs]

https://llvm.org/bugs/show_bug.cgi?id=29003

            Bug ID: 29003
           Summary: Wrong .file directive generated by -S
           Product: new-bugs
           Version: trunk
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P
         Component: new bugs
          Assignee: unassignedbugs at nondot.org
          Reporter: hjl.tools at gmail.com
                CC: llvm-bugs at lists.llvm.org
    Classification: Unclassified

On Linux, I got

[hjl at gnu-6 tmp]$ cat x.c
void
foo ()
{
}
[hjl at gnu-6 tmp]$ cat y.c
#include "x.c"
[hjl at gnu-6 tmp]$ clang -S -O2 y.c -g
[hjl at gnu-6 tmp]$ gcc -c y.s
y.s: Assembler messages:
y.s:8: Error: junk at end of line, first unrecognized character is `"'
[hjl at gnu-6 tmp]$ 

The bad line is

    .file    1 "." "x.c"

>From GNU assembler manual:

When emitting DWARF2 line number information, '.file' assigns filenames
to the '.debug_line' file name table.  The syntax is:

     .file FILENO FILENAME

   The FILENO operand should be a unique positive integer to use as the
index of the entry in the table.  The FILENAME operand is a C string
literal.

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