[PATCH] [gdb/build] Fix unused var in corelow.c

[Lancelot SIX]

Hi,

FYI, I see the same issue on a CI system.

FWIW, the patch looks good to me.

Reviewed-By: Lancelot Six<lancelot.six@amd.com>

Best,
Lancelot.

On Mon, Sep 09, 2024 at 06:19:13AM +0200, Tom de Vries wrote:
> On x86_64-linux, with gcc 7.5.0 and CFLAGS/CXXFLAGS="-O0 -g -Wall" I ran into
> a build breaker:
> ...
> gdb/corelow.c: In member function ‘void mapped_file_info::add(const char*, const char*, const char*, std::vector<mem_range>&&, const bfd_build_id*)’:
> gdb/corelow.c:1822:27: error: unused variable ‘it’ [-Werror=unused-variable]
>    const auto [it, inserted]
>                            ^
> ...
> 
> Fix this by dropping the variable it.
> 
> Tested on x86_64-linux.
> ---
>  gdb/corelow.c | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/gdb/corelow.c b/gdb/corelow.c
> index 16f07c23faa..ab2fa746de8 100644
> --- a/gdb/corelow.c
> +++ b/gdb/corelow.c
> @@ -1819,8 +1819,8 @@ mapped_file_info::add (const char *soname,
>       parsed, we group the build-id information based on the file name.  As
>       a consequence, we should see each EXPECTED_FILENAME value exactly
>       once.  This means that each insertion should always succeed.  */
> -  const auto [it, inserted]
> -    = m_filename_to_build_id_map.emplace (expected_filename, build_id);
> +  const auto inserted
> +    = m_filename_to_build_id_map.emplace (expected_filename, build_id).second;
>    gdb_assert (inserted);
>  
>    /* Setup the reverse build-id to file name map.  */
> 
> base-commit: 29c70787112e01cd52b53bf14bdcacb0a11e0725
> -- 
> 2.35.3
>