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https://github.com/arakiken/mlterm/pull/68
From 4eb1a0b237a861cee7ba0ceb4b69d54ab46f87f5 Mon Sep 17 00:00:00 2001
From: Sam James <sam@gentoo.org>
Date: Sun, 16 Apr 2023 11:38:16 +0100
Subject: [PATCH] Fix configure.ac compatibility 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.
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].
Bug: https://bugs.gentoo.org/904353
[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.
--- a/baselib/configure
+++ b/baselib/configure
@@ -13226,6 +13226,8 @@ See \`config.log' for more details" "$LINENO" 5; }
else
cat confdefs.h - <<_ACEOF >conftest.$ac_ext
/* end confdefs.h. */
+#define _XOPEN_SOURCE 600
+#include <stdlib.h>
#include <fcntl.h>
int
main ()
@@ -13599,6 +13601,8 @@ else
/* end confdefs.h. */
#include <stdio.h>
+ #include <stdlib.h>
+ #include <stddef.h>
int main() {
return calloc(8, ((1 << (sizeof(size_t) * 8 - 1)) + 1)) ? 1 : 0 ;
}
--- a/baselib/configure.in
+++ b/baselib/configure.in
@@ -285,7 +285,9 @@ elif test "$bl_cv_mingw" = "yes" ; then
bl_cv_pty=streams
elif test "$host" = "$build" ; then
AC_CHECK_FUNC(posix_openpt,
- [AC_RUN_IFELSE([AC_LANG_PROGRAM([#include <fcntl.h>],
+ [AC_RUN_IFELSE([AC_LANG_PROGRAM([#define _XOPEN_SOURCE 600
+ #include <stdlib.h>
+ #include <fcntl.h>],
[return posix_openpt(O_RDWR | O_NOCTTY) == -1;])],
[
AC_DEFINE(HAVE_POSIX_OPENPT,,"HAVE_POSIX_OPENPT")
@@ -435,6 +437,8 @@ if test "$host" = "$build"; then
AC_TRY_RUN(
[
#include <stdio.h>
+ #include <stdlib.h>
+ #include <stddef.h>
int main() {
return calloc(8, ((1 << (sizeof(size_t) * 8 - 1)) + 1)) ? 1 : 0 ;
}
--- a/configure
+++ b/configure
@@ -25110,6 +25110,8 @@ See \`config.log' for more details" "$LINENO" 5; }
else
cat confdefs.h - <<_ACEOF >conftest.$ac_ext
/* end confdefs.h. */
+#define _XOPEN_SOURCE 600
+#include <stdlib.h>
#include <fcntl.h>
int
main ()
@@ -25147,6 +25149,7 @@ else
cat confdefs.h - <<_ACEOF >conftest.$ac_ext
/* end confdefs.h. */
#include <fcntl.h>
+#include <sys/stat.h>
int
main ()
{
@@ -25475,6 +25478,8 @@ else
/* end confdefs.h. */
#include <stdio.h>
+ #include <stdlib.h>
+ #include <stddef.h>
int main() {
return calloc(8, ((1 << (sizeof(size_t) * 8 - 1)) + 1)) ? 1 : 0 ;
}
--- a/configure.in
+++ b/configure.in
@@ -2150,7 +2150,9 @@ elif test "$bl_cv_mingw" = "yes" ; then
bl_cv_pty=streams
elif test "$host" = "$build" ; then
AC_CHECK_FUNC(posix_openpt,
- [AC_RUN_IFELSE([AC_LANG_PROGRAM([#include <fcntl.h>],
+ [AC_RUN_IFELSE([AC_LANG_PROGRAM([#define _XOPEN_SOURCE 600
+ #include <stdlib.h>
+ #include <fcntl.h>],
[return posix_openpt(O_RDWR | O_NOCTTY) == -1;])],
[
AC_DEFINE(HAVE_POSIX_OPENPT,,"HAVE_POSIX_OPENPT")
@@ -2160,7 +2162,8 @@ elif test "$host" = "$build" ; then
[bl_cv_pty=bsd])
if test "$bl_cv_pty" = "bsd" ; then
AC_RUN_IFELSE(
- [AC_LANG_PROGRAM([#include <fcntl.h>],
+ [AC_LANG_PROGRAM([#include <sys/stat.h>
+ #include <fcntl.h>],
[return open( "/dev/ptmx", O_RDWR | O_NOCTTY, 0) == -1;])],
[bl_cv_pty=streams])
fi
@@ -2297,6 +2300,8 @@ if test "$host" = "$build"; then
AC_TRY_RUN(
[
#include <stdio.h>
+ #include <stdlib.h>
+ #include <stddef.h>
int main() {
return calloc(8, ((1 << (sizeof(size_t) * 8 - 1)) + 1)) ? 1 : 0 ;
}
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