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31 lines
1.1 KiB
31 lines
1.1 KiB
https://github.com/aranym/aranym/pull/102
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From ef9ba74fcbf868aeb1b0e0b02e53775a14cda0f7 Mon Sep 17 00:00:00 2001
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From: Sam James <sam@gentoo.org>
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Date: Sun, 19 Mar 2023 01:56:56 +0000
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Subject: [PATCH] configure.ac: fix -Wimplicit-function-declaration in TUN/TAP
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test
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Clang 16 makes -Wimplicit-function-declaration an error by default.
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Unfortunately, this can lead to misconfiguration or miscompilation of software as configure
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tests may then return the wrong result.
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For more information, see LWN.net [0] or LLVM's Discourse [1], the Gentoo wiki [2],
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or the (new) c-std-porting mailing list [3].
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[0] https://lwn.net/Articles/913505/
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[1] https://discourse.llvm.org/t/configure-script-breakage-with-the-new-werror-implicit-function-declaration/65213
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[2] https://wiki.gentoo.org/wiki/Modern_C_porting
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[3] hosted at lists.linux.dev.
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--- a/configure.ac
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+++ b/configure.ac
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@@ -539,6 +539,7 @@ AC_CACHE_CHECK([whether TUN/TAP is supported],
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#include <net/if.h>
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#include <net/if_tun.h>
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#endif
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+ #include <string.h>
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], [
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struct ifreq ifr;
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memset(&ifr, 0, sizeof(ifr));
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