[Bug guile/30767] New: [gdb/guile, build, c++20] Werror=volatile in SCM_UNPACK

[Bug guile/30767] New: [gdb/guile, build, c++20] Werror=volatile in SCM_UNPACK

[vries at gcc dot gnu.org]

https://sourceware.org/bugzilla/show_bug.cgi?id=30767

            Bug ID: 30767
           Summary: [gdb/guile, build, c++20] Werror=volatile in
                    SCM_UNPACK
           Product: gdb
           Version: HEAD
            Status: NEW
          Severity: normal
          Priority: P2
         Component: guile
          Assignee: unassigned at sourceware dot org
          Reporter: vries at gcc dot gnu.org
  Target Milestone: ---

When building gdb with -std=c++20, I run into:
...
In file included from /usr/include/guile/2.0/libguile/__scm.h:479,
                 from /usr/include/guile/2.0/libguile.h:31,
                 from /data/vries/gdb/src/gdb/guile/guile-internal.h:30,
                 from /data/vries/gdb/src/gdb/guile/guile.c:37:
/usr/include/guile/2.0/libguile/gc.h: In function ‘scm_unused_struct*
scm_cell(scm_t_bits, scm_t_bits)’:
/usr/include/guile/2.0/libguile/tags.h:98:63: error: using value of assignment
with ‘volatile’-qualified left operand is deprecated [-Werror=volatile]
   98 | #   define SCM_UNPACK(x) ((scm_t_bits) (0? (*(volatile SCM *)0=(x)):
x))
      |                                            ~~~~~~~~~~~~~~~~~~~^~~~~
...

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[Bug guile/30767] [gdb/guile, build, c++20] Werror=volatile in SCM_UNPACK

[tromey at sourceware dot org]

https://sourceware.org/bugzilla/show_bug.cgi?id=30767

Tom Tromey <tromey at sourceware dot org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |tromey at sourceware dot org

--- Comment #1 from Tom Tromey <tromey at sourceware dot org> ---
The code can't be run so it is probably just some syntactic check.
Anyway it should be reported to Guile.

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[Bug guile/30767] [gdb/guile, build, c++20] Werror=volatile in SCM_UNPACK

[vries at gcc dot gnu.org]

https://sourceware.org/bugzilla/show_bug.cgi?id=30767

--- Comment #2 from Tom de Vries <vries at gcc dot gnu.org> ---
(In reply to Tom Tromey from comment #1)
> The code can't be run so it is probably just some syntactic check.

It is, this is with the default SCM_DEBUG_TYPING_STRICTNESS == 1, I suppose if
needed we could work around this by defining to 2 or 0.

See https://fossies.org/linux/guile/libguile/scm.h

> Anyway it should be reported to Guile.

Done.

https://debbugs.gnu.org/cgi/bugreport.cgi?bug=65333

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