gentoo-ebuilds/app-text/linuxdoc-tools/files/linuxdoc-tools-0.9.82-configure-clang16.patch

Patch emailed to upstream.

From 216e770ced47ad0017cd43033ef213c2634fe87a Mon Sep 17 00:00:00 2001
From: Sam James <sam@gentoo.org>
Date: Tue, 6 Dec 2022 08:53:14 +0000
Subject: [PATCH] sgmls-1.1: fix configure script with Clang 16

Clang 16 makes -Wimplicit-function-declaration and -Wimplicit-int errors by default.

Unfortunately, this can lead to misconfiguration or miscompilation of software as configure
tests may then return the wrong result. In this case, it led to a build failure
(see https://bugs.gentoo.org/883203).

We also fix -Wstrict-prototypes while here as it's easy to do and it prepares
us for C23.

For more information, see LWN.net [0] or LLVM's Discourse [1], the Gentoo wiki [2],
or the (new) c-std-porting mailing list [3].

[0] https://lwn.net/Articles/913505/
[1] https://discourse.llvm.org/t/configure-script-breakage-with-the-new-werror-implicit-function-declaration/65213
[2] https://wiki.gentoo.org/wiki/Modern_C_porting
[3] hosted at lists.linux.dev.

Bug: https://bugs.gentoo.org/883203
Signed-off-by: Sam James <sam@gentoo.org>
--- a/sgmls-1.1/configure
+++ b/sgmls-1.1/configure
@@ -110,13 +110,14 @@ cat >doit.c <<\EOF
 
 #include <ctype.h>
 #include <signal.h>
+#include <stdlib.h>
 
-static int whoops()
+static void whoops(int signal)
 {
   _exit(1);
 }
 
-main()
+int main(void)
 {
   int c;
 #ifdef isascii
@@ -213,9 +214,9 @@ else
 fi
 
 cat >doit.c <<\EOF
-main(argc, argv)
-int argc;
-char **argv;
+#include <stdio.h>
+#include <stdlib.h>
+int main(int argc, char **argv)
 {
   if (argc == 0)
     remove("foo");
@@ -231,9 +232,9 @@ else
 fi
 
 cat >doit.c <<\EOF
-main(argc, argv)
-int argc;
-char **argv;
+#include <unistd.h>
+#include <stdlib.h>
+int main(int argc, char **argv)
 {
   if (argc == 0)
     getopt(argc, argv, "v");
@@ -249,9 +250,9 @@ else
 fi
 
 cat >doit.c <<\EOF
-main(argc, argv)
-int argc;
-char **argv;
+#include <stdlib.h>
+#include <unistd.h>
+int main(int argc, char **argv)
 {
   if (argc == 0)
     access("foo", 4);
@@ -267,9 +268,9 @@ else
 fi
 
 cat >doit.c <<\EOF
-main(argc, argv)
-int argc;
-char **argv;
+#include <stdlib.h>
+#include <unistd.h>
+int main(int argc, char **argv)
 {
   if (argc == 0)
     vfork();
@@ -285,9 +286,9 @@ else
 fi
 
 cat >doit.c <<\EOF
-main(argc, argv)
-int argc;
-char **argv;
+#include <stdlib.h>
+#include <sys/wait.h>
+int main(int argc, char **argv)
 {
 
   if (argc == 0) {
@@ -306,10 +307,9 @@ else
 fi
 
 cat >doit.c <<\EOF
+#include <stdlib.h>
 #include <string.h>
-main(argc, argv)
-int argc;
-char **argv;
+int main(int argc, char **argv)
 {
   if (argc == 0)
     strerror(0);
@@ -326,9 +326,8 @@ fi
 
 cat >doit.c <<\EOF
 #include <strings.h>
-main(argc, argv)
-int argc;
-char **argv;
+#include <stdlib.h>
+int main(int argc, char **argv)
 {
   if (argc == 0)
 	bcopy((char *)0, (char *)0, 0);
@@ -340,10 +339,9 @@ if $CC $CFLAGS -o doit doit.c $LIBS >/dev/null 2>&1 && ./doit 2>/dev/null
 then
 	# Only use BSD_STRINGS if ANSI string functions don't work.
 	cat >doit.c <<\EOF
+#include <stdlib.h>
 #include <string.h>
-main(argc, argv)
-int argc;
-char **argv;
+int main(int argc, char **argv)
 {
   if (argc == 0)
 	memcpy((char *)0, (char *)0, 0);
@@ -363,9 +361,8 @@ fi
 
 cat >doit.c <<\EOF
 #include <signal.h>
-main(argc, argv)
-int argc;
-char **argv;
+#include <stdlib.h>
+int main(int argc, char **argv)
 {
   if (argc == 0)
     raise(SIGINT);
@@ -382,9 +379,8 @@ fi
 
 cat >doit.c <<\EOF
 #include <stdio.h>
-main(argc, argv)
-int argc;
-char **argv;
+#include <stdlib.h>
+int main(int argc, char **argv)
 {
   if (argc == 0) {
     fpos_t pos;
@@ -404,12 +400,11 @@ fi
 
 cat >doit.c <<\EOF
 #include <unistd.h>
+#include <stdlib.h>
 #include <sys/types.h>
 #include <sys/wait.h>
 
-main(argc, argv)
-int argc;
-char **argv;
+int main(int argc, char **argv)
 {
   if (argc == 0) {
     pid_t pid;
@@ -436,14 +431,15 @@ fi
 
 cat >doit.c <<\EOF
 #include <stdio.h>
+#include <stdlib.h>
 #include <signal.h>
 
-static int whoops()
+static void whoops(int signal)
 {
   _exit(1);
 }
 
-main()
+int main(void)
 {
   char buf[30];
 #ifdef SIGSEGV
@@ -469,10 +465,9 @@ fi
 
 cat >doit.c <<\EOF
 #include <nl_types.h>
+#include <stdlib.h>
 
-main(argc, argv)
-int argc;
-char **argv;
+int main(int argc, char **argv)
 {
   if (argc == 0) {
     nl_catd d = catopen("foo", 0);
@@ -492,12 +487,11 @@ fi
 
 cat >doit.c <<\EOF
 #include <limits.h>
+#include <stdlib.h>
 
 char c = UCHAR_MAX;
 
-main(argc, argv)
-int argc;
-char **argv;
+int main(int argc, char **argv)
 {
 #if CHAR_MIN < 0
   exit(!(c < 0));
@@ -512,7 +506,8 @@ then
 	char_signed=
 else
 	cat >doit.c <<\EOF
-main()
+#include <stdlib.h>
+int main(void)
 {
   int i;
 
-- 
2.38.1