[Bug gas/16908] New: #line directives are ignored inside macros

[cmetcalf at tilera dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=16908

            Bug ID: 16908
           Summary: #line directives are ignored inside macros
           Product: binutils
           Version: 2.25 (HEAD)
            Status: NEW
          Severity: normal
          Priority: P2
         Component: gas
          Assignee: unassigned at sourceware dot org
          Reporter: cmetcalf at tilera dot com

The following example generates wrong debug info for line numbers:

# 1 "file.S"
.macro test
# 100 "file.S"
.endm
nop

Because it is inside a macro, the "#line" directive is apparently ignored, and
the "nop" instruction ends up tagged as being on line 4.

This is particularly problematic as the C preprocessor will replace long C89
comment blocks, and long #if or #ifdef blocks that evaluate false, with just a
single "#line" directive.  (Short runs are just converted to blank lines.)

The upshot is that using #ifdefs or C89 comments in .macro directives causes
the line info for debugging to become useless.

Tested on x86 with 2.20, 2.24, and git tip at commit c888a17da5c7; and on
tilegx with 2.21.

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