Re: [PATCH v2] PR gdb/33747: gdb/ser-unix: Avoid musl build failure when setting custom baud rates

[Eli Zaretskii <eliz@gnu.org>]

> From: sunilkumar.dora@windriver.com
> Cc: sunilkumar.dora@windriver.com, Randy.MacLeod@windriver.com,
>  Sundeep.Kokkonda@windriver.com, kevinb@redhat.com, macro@orcam.me.uk,
>  schwab@linux-m68k.org, tromey@sourceware.org, simark@simark.ca
> Date: Sun, 22 Feb 2026 12:06:48 -0800
> 
> From: Sunil Dora <sunilkumar.dora@windriver.com>
> 
> The Linux custom baud rate implementation accessed the struct termios 
> members c_ispeed and c_ospeed directly. These fields are provided by 
> glibc but are not exposed by musl, which causes the build to fail on 
> musl-based systems.
> 
> Adjust set_custom_baudrate_linux to use a capability-based approach.
> The Autoconf check HAVE_NUMERIC_BAUD_RATES determines whether
> B-constants match numeric baud rates. If they do, use the standard
> POSIX cfsetispeed and cfsetospeed interfaces. Otherwise, fall back
> to the Linux-specific termios2 interface (TCGETS2) to support
> arbitrary baud rates.
> 
> This preserves existing behavior on glibc systems while restoring
> build compatibility with musl.
> 
> Signed-off-by: Sunil Dora <sunilkumar.dora@windriver.com>
> ---
>  gdb/NEWS         |  4 ++++
>  gdb/config.in    |  3 +++
>  gdb/configure    | 39 +++++++++++++++++++++++++++++++++++++++
>  gdb/configure.ac | 19 +++++++++++++++++++
>  gdb/ser-unix.c   | 42 ++++++++++++++++++++++++++----------------
>  5 files changed, 91 insertions(+), 16 deletions(-)

Thanks, the NEWS part is approved.

Reviewed-By: Eli Zaretskii <eliz@gnu.org>