[Bug ld/20026] New: Inconsistent parsing of linker scripts

[felix.von.s at posteo dot de]

https://sourceware.org/bugzilla/show_bug.cgi?id=20026

            Bug ID: 20026
           Summary: Inconsistent parsing of linker scripts
           Product: binutils
           Version: 2.26
            Status: NEW
          Severity: minor
          Priority: P2
         Component: ld
          Assignee: unassigned at sourceware dot org
          Reporter: felix.von.s at posteo dot de
  Target Milestone: ---

BFD ld has inconsistent ideas about what constitutes a valid unquoted symbol
name. There may be other inconsistencies besides this, but this one is the
easiest to reproduce.

Suppose t.ld contains:

> INCLUDE "s.ld"

while s.ld contains:

> SECTIONS {
>     a*b = 0;
>     =1  = 0;
> }

BFD ld will perform linking with t.ld, but not s.ld:

$ > x.s
$ as x.s -o x.o
$ ld.bfd x.o -T t.ld
$ ld.bfd x.o -T s.ld
ld.bfd:s.ld:2: syntax error

gold consistently rejects line 3 of s.ld, but not line 2:

$ ld.gold x.o -T t.ld
ld.gold: error: s.ld:3:5: syntax error, unexpected '='
$ ld.gold x.o -T s.ld
ld.gold: error: s.ld:3:5: syntax error, unexpected '='

Bug discovered because I wanted to create a syntax highlighter for linker
scripts, and apparently the only available complete description of linker
script syntax is ldlex.l and ldgram.y... some documentation would be nice.

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