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From 1cb5dc04605daa45f1c6a647c17442ed7ff2fe4e Mon Sep 17 00:00:00 2001
From: nhmall <nhmall@nethack.org>
Date: Tue, 4 Jan 2022 08:24:08 -0500
Subject: [PATCH] work around ubuntu 20.10 build issue
NetHack was trying to suppress warn_unused_result
in include/tradstdc.h, by defining warn_unused_result
to an empty string. That began causing a build error
in a system-supplied header file cdefs.h
when using 20.10 ubuntu impish.
Try skipping that in tradstdc.h for any linux, unless
the NetHack build defines GCC_URWARN to force it into
play.
---
include/tradstdc.h | 2 ++
1 file changed, 2 insertions(+)
diff --git a/include/tradstdc.h b/include/tradstdc.h
index 09decb4b15..8c33d55e0a 100644
--- a/include/tradstdc.h
+++ b/include/tradstdc.h
@@ -405,12 +405,14 @@ typedef genericptr genericptr_t; /* (void *) or (char *) */
#if __GNUC__ >= 3
#define UNUSED __attribute__((unused))
#define NORETURN __attribute__((noreturn))
+#if !defined(__linux__) || defined(GCC_URWARN)
/* disable gcc's __attribute__((__warn_unused_result__)) since explicitly
discarding the result by casting to (void) is not accepted as a 'use' */
#define __warn_unused_result__ /*empty*/
#define warn_unused_result /*empty*/
#endif
#endif
+#endif
#ifndef PRINTF_F
#define PRINTF_F(f, v)
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