[Bug ld/26701] New: Ability to suppress warnings due to tags in a library

[eyalroz at technion dot ac.il]

https://sourceware.org/bugzilla/show_bug.cgi?id=26701

            Bug ID: 26701
           Summary: Ability to suppress warnings due to tags in a library
           Product: binutils
           Version: unspecified
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: ld
          Assignee: unassigned at sourceware dot org
          Reporter: eyalroz at technion dot ac.il
  Target Milestone: ---

This is a generalization of bug 12017.

Compilers typically allow the user to suppress specific warnings, either
globally or locally at specific places in the code. 

Now, the linker apparently emits a warning when a symbol is used whose library
entry(/ies) indicate such a warning needs to be emitted. It should have an
option to suppress such warnings, in at least the following resolutions IMHO:

1. Globally
2. By (library, symbol name) pair
3. By library (e.g. glibc warnings)
4. By call site

Let's ignore (4.) for now because this is more complex and would require
compiler support for users to make work and focus on (1.)through (3.) . IIANM,
neither is currently possible with ld right now.

Now, (1.) should be really easy to implement; and (2.) and (3.) should not be
difficult to implement, and in a away such that the cost is minimal (e.g. have
a flag for whether _any_ specific suppressions are used, so when none are used
it's an extra flag check when having to emit a warning - a tolerable cost.)

If this were implemented, it would allow for an easy resolution of 12017.

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