html-xml-utils: fix build with GCC 15 (#484283)

From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001

From: Amaan Qureshi <git@amaanq.com>

Date: Mon, 27 Jan 2026 00:00:00 -0500

Subject: [PATCH] Fix GCC 15 build by adding proper function prototype

GCC 15 treats empty parentheses as (void), conflicting with the actual

lookup_element signature generated by gperf. This was intentionally done,

as version 7.7 removed the arguments because gperf 3.0 generates `unsigned int`

while gperf 3.1 generates `size_t`. However, gperf 3.1 is nearly 10 years old,

so it's reasonable to assume that practically every system that wants

to use GCC 15 will have gperf 3.1 or later.

This patch uses `size_t` to match gperf 3.1.

---

 dtd.hash | 4 ++--

 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/dtd.hash b/dtd.hash

--- a/dtd.hash

+++ b/dtd.hash

@@ -43,8 +43,8 @@ EXPORT typedef struct _ElementType {

 } ElementType;

 /* lookup_element -- look up the string in the hash table */

-EXPORT const ElementType * lookup_element(/* register const char *str,

-					  register unsigned int len */);

+EXPORT const ElementType * lookup_element(register const char *str,

+					  register size_t len);

 /* Different kinds of parent elements: */

 #define PHRASE "abbr", "acronym", "b", "bdi", "bdo", "big", "cite", "code", "dfn", "em", "i", "kbd", "q", "s", "samp", "small", "span", "strong", "sub", "sup", "time", "tt", "u", "var"

  stdenv,

  fetchurl,

  curl,

  gperf,

  libiconv,

}:

    sha256 = "sha256-iIoxYxp6cDCLsvMz4HfQQW9Lt4MX+Gl/+0qVGH9ncwE=";

  };

  patches = [ ./gcc15.patch ];

  nativeBuildInputs = [ gperf ];

  buildInputs = [

    curl

    libiconv