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This error is caused by stricter pointer type checking in GCC 14 and later versions. To work around this, you can try the following method: Suppress the compiler warning using CFLAGS:

CFLAGS+=" -Wno-error=incompatible-pointer-types" makepkg

Another workaround is to specify clang as the CC (C Compiler) instead of gcc. The current version of clang is likely to not treat this as an error.

sudo pacman -S clang
CC=clang
makepkg

I believe that with either of the above methods, it should be possible to build without applying a patch.

Additionally, it would likely be better to move the patch section of this PKGBUILD to the prepare function.

Alright, that was more messy than I thought, but I think I figured out how to keep git from messing up the line endings there

Hmm, I was wondering why diff emitted a patch with CRLF line endings... And I guess I overlooked that git ends up replacing them, which causes the mismatched checksum :/

edit: Aha, I see the mariadb folks are packaging their stuff with CRLF endings... odd...

The patch is failing because of line ending differences.

Changing build() to:
patch --binary --forward --strip=1 --input="${srcdir}/gcc14-const.patch"
should be a quick fix (add --binary)

@kiito - gcc14-const.patch ... FAILED ==> ERROR: One or more files did not pass the validity check! The sha512sum of the patch file is corrupt.

Yeah I sort of forgot to look into this. There's an issue upstream (https://jira.mariadb.org/projects/CONPY/issues/CONPY-284) but no response, so I went ahead and added a patch to the package.

Month later, having the same error (the fix by Nestor_013 works).

It seems that gcc-14 is more strict about conversions from const pointers to pointers.

By commenting the const on line 1128 of mariadb_cursor.c like this

 /*const*/ char *statement;

it compiles. To me (but I could be wrong) the constness of *statement is not critical.

Hmm, I seems building with python 3.12 isn't an issue upstream. I'm currently unable to investigate myself but will try to see to it until next weekend.

Can't Build package.

mariadb/mariadb_cursor.c: In function ‘MrdbCursor_execute_text’:
mariadb/mariadb_cursor.c:1138:39: error: passing argument 2 of ‘PyBytes_AsStringAndSize’ from incompatible pointer type [-Wincompatible-pointer-types]
 1138 |         PyBytes_AsStringAndSize(stmt, &statement, (Py_ssize_t *)&statement_len);
      |                                       ^~~~~~~~~~
      |                                       |
      |                                       const char **
In file included from /usr/include/python3.12/Python.h:50,
                 from ./include/mariadb_python.h:21,
                 from mariadb/mariadb_cursor.c:20:
/usr/include/python3.12/bytesobject.h:56:12: note: expected ‘char **’ but argument is of type ‘const char **’
   56 |     char **s,           /* pointer to buffer variable */
      |     ~~~~~~~^
error: command '/usr/bin/gcc' failed with exit code 1
==> ERROR: A failure occurred in build().
    Aborting...